High pressure fire resistant HDPE fire pipe extrusion equipment is the complete production system that converts PE100 or PE100-RC pipe compound into thick-wall, pressure-rated polyethylene pipe used for commercial building fire fighting pipeline — buried fire mains, underground hydrant loops, sprinkler supply headers and fire pump suction and discharge lines. The equipment is not a generic water pipe line with a red stripe added. Producing pipe that will hold 1.6 MPa of working pressure for fifty years, survive surge events from a fire pump starting, and pass 80 degrees Celsius 1000-hour hydrostatic testing demands a specific combination of barrier screw design, die head melt distribution, multi-stage vacuum calibration, controlled cooling gradients and closed-loop wall thickness measurement. Faygo, Wanplas 공장 with 22 years of dedicated experience in plastic pipe and profile extrusion lines, three specialized factories, 26,650 square meters of production space in Zhangjiagang and 13 national patents including 8 invention patents, builds these lines for pipe manufacturers supplying construction contractors, municipal fire authorities and industrial park developers.
This guide covers the whole engineering chain. It starts with the material and the pressure rating logic that determines what the extrusion line must physically produce — the relationship between minimum required strength, design coefficient, standard dimension ratio and nominal pressure, and the wall thickness targets that follow. It then addresses the question that confuses most buyers entering this market: how a combustible thermoplastic can legitimately serve in a fire fighting pipeline, and which of the four engineering routes — burial, concrete encasement, protective sleeving, or flame retardant compounding — applies to which part of a building. From there the article walks the full line configuration, gives concrete process parameter windows, presents Faygo line specifications by diameter tier, provides a requirement-to-configuration selection table, lists the release and type tests that gatekeep a pressure pipe product, and closes with a defect troubleshooting matrix built from real production experience.
The commercial driver behind this equipment category is straightforward. Steel and ductile iron fire mains corrode, need cathodic protection when buried, and require welded or flanged joints that concentrate labor cost on site. Butt-fused HDPE fire main is monolithic, leak-free at every joint, immune to electrochemical corrosion in aggressive soils, and can be installed in long coiled or stick lengths with far less trenching disruption. As of 2026, an increasing number of commercial developments — shopping complexes, logistics parks, data centers, hospital campuses and high-rise residential clusters — specify buried polyethylene fire service mains as the default rather than the exception. Pipe manufacturers who can hold PN16 quality consistently across 63 to 575 millimeter diameters are the ones winning those supply contracts, and the extrusion line is where that consistency is either built in or lost.
What High Pressure Fire Resistant HDPE Fire Pipe Actually Is
High pressure fire resistant HDPE fire pipe is pressure-rated polyethylene pipe, manufactured from PE100 or PE100-RC compound, dedicated to fire protection service and identified either by a full red pipe body or by co-extruded red identification stripes along its length. Its dimensional and performance basis is the same family of standards that governs potable water and gas distribution pipe — GB/T 13663, ISO 4427, EN 12201 and ASTM F714 — with additional fire service qualification coming from documents such as NFPA 24 for private fire service mains, UL 1285 and FM 1613 for underground fire protection piping. The pipe is a pressure vessel, and every process decision in the extrusion line exists to protect that pressure rating.
The base resin matters more than any other single input. PE100 is a bimodal high density polyethylene with a minimum required strength of 10.0 MPa, meaning that extrapolated long-term hydrostatic testing predicts the material will sustain 10.0 MPa of hoop stress for 50 years at 20 degrees Celsius. PE100-RC — resistance to crack — is a further-refined grade with markedly improved slow crack growth resistance, and it is the correct specification when the fire main will be installed by trenchless methods, laid in a sand-free bed with stone contact, or subjected to point loading from backfill. For fire service the practical implication is that PE100-RC buys the installer freedom to use narrow trench and plow-in installation without a sand surround, which on a large commercial site translates into meaningful schedule compression.
Physically, the pipe consists of a homogeneous PE100 wall. There is no reinforcement layer, no liner and no core structure. All of its pressure capability comes from wall thickness and material strength, which is why the standard dimension ratio governs everything. Optional features that a modern fire pipe line must be able to add include co-extruded color stripes for identification, a co-extruded protective outer skin of modified polypropylene or PE for trenchless installation, and a permanent inkjet or hot-foil marking line carrying the manufacturer identity, the material grade, the diameter, the SDR, the pressure rating, the standard number and the production timestamp.
The distinction between fire pipe and general water pipe lies in three places. First, identification: fire service pipe must be visually unmistakable underground, hence red body or red stripes, and the color masterbatch must be dosed and dispersed without creating pigment agglomerates that act as crack initiation sites. Second, surge tolerance: a fire pump starting against a closed system generates pressure transients that a domestic water main never sees, so the design pressure calculation must include an allowance above the static working pressure. Third, traceability: fire protection is a life safety system, and every meter of pipe must be traceable to a batch, a shift, a die head and a set of test results. An extrusion line that cannot record and print that data chain is not suitable for fire pipe production regardless of how well it extrudes.
One point deserves emphasis because it is the most common misunderstanding in this product category. Polyethylene is a combustible thermoplastic. It softens near 125 to 135 degrees Celsius, it has a limiting oxygen index around 17 to 18 percent in unmodified form, and it burns with dripping. No amount of pressure rating changes that. Consequently HDPE fire pipe is not a substitute for steel standpipes in an exposed stairwell or for listed sprinkler branch lines in a ceiling void. Its legitimate territory is underground and protected: buried fire mains, buried hydrant loops, buried pump suction lines, and concrete-encased or sleeved risers up to the point where the system transitions to metallic pipe. Section three explains the engineering routes that make this legitimate territory defensible in a fire protection design review.
The Pressure Rating System: MRS, Design Coefficient, SDR and PN
HDPE 화재 파이프의 압력 등급은 계산된 결과이며 마케팅 주장이 아니며, 압출 라인이 생산해야 하는 벽 두께와 직접 연결됩니다. 체인은 최소 요구 강도부터 전체 설계 계수에 이르기까지 표준 치수 비율 및 최종적으로 명목 압력에 연결됩니다. 이러한 체인을 이해하는 것은 생산 관리자가 벽 두께 게이지가 어떤 허용 오차 범위를 유지해야 하는지 정확히 알 수 있게 해줍니다.
최소 요구 강도, or MRS, is the classified long-term hydrostatic strength of the compound. PE100 has an MRS of 10.0 MPa; PE80 has 8.0 MPa. The design coefficient, written as C, is a safety factor applied to the MRS to obtain the allowable design stress. For water and fire service applications the standard value is C equal to 1.25, giving a design stress of 8.0 MPa for PE100. Gas applications use higher coefficients. Once the design stress is fixed, the maximum operating pressure follows from the thin-wall hoop stress relationship, expressed in the form used throughout the polyethylene pipe standards:
MOP = (2 × MRS) / (C × (SDR − 1))
Where MRS = 10.0 MPa for PE100, C = 1.25 for water and fire service, and SDR = D / e, the ratio of nominal outside diameter to nominal wall thickness.
벽 두께: e = D / SDR- 압출 라인의 직접 생산 목표입니다.
Working through the arithmetic produces the standard ladder of pressure classes. An SDR11 PE100 pipe yields 20 divided by 12.5, which equals 1.6 MPa, hence PN16. SDR17 yields 20 divided by 20, which equals 1.0 MPa, hence PN10. The full ladder appears in the table below alongside the practical role each class plays in a commercial building fire fighting pipeline.
| SDR | Calculated MOP (MPa) | Nominal 압력 등급 | Wall / Diameter Ratio | 일반적인 역할 in Fire Fighting Pipeline |
|---|---|---|---|---|
| SDR26 | 0.64 | PN6 | 3.8 percent of OD | 화재용 수동 배수, 탱크 오버플로 라인, 비정상적인 부대용 라인 |
| SDR21 | 0.80 | PN8 | 4.8 percent of OD | 중력 공급식 저장 탱크 공급 라인, 관개용 품질의 현장 루프에는 펌프 서지가 없습니다. |
| 목차 | 1.00 | PN10 | 5.9 percent of OD | 대형 직경의 매설식 화재 링 메인, 낮은 높이의 캠퍼스 루프, 소화기 분기 라인 |
| SDR13.6 | 1.27 | PN12.5 | 7.4 percent of OD | 중간 등급은 중등 높이의 건물과 중등 서지 임무를 위한 것입니다. |
| SDR11 기준 | 1.60 | PN16 기준 | 9.1 percent of OD | 워크호스 등급은 펌프 화재 메인, 소화기 루프 및 스프링클러 공급 헤더를 위한 것입니다. |
| SDR9 | 2.00 | PN20 | 11.1 percent of OD | 고층 스탠파이 공급, 깊은 펌프 배출, 높은 서지 임무, 트렌치리스 풀 |
Two classes dominate commercial building fire fighting pipeline. SDR11 at PN16 is the default for pumped systems, because a fire pump commonly develops 0.8 to 1.2 MPa at the discharge flange and the surge allowance pushes the design requirement above the 1.0 MPa that SDR17 provides. SDR17 at PN10 is used where the main is large in diameter and the operating pressure is genuinely modest — long buried ring mains around a low-rise logistics park, for instance — because the material saving on a 400 or 450 millimeter pipe is substantial. When the designer is uncertain, the conservative move is SDR11, and the production consequence is a significantly thicker wall that changes the entire cooling and haul-off strategy.
HDPE 소화관 압출 시 발생하는 결점, 원인 코어 및 최적화 작업 매트릭스 표
| 외부 직경 (mm) | SDR26 / PN6 | SDR21 / PN8 | SDR17 / PN10 | SDR13.6 / PN12.5 | SDR11/ PN16 | SDR9 / PN20 |
|---|---|---|---|---|---|---|
| 63 | 2.5 | 3.0 | 3.8 | 4.7 | 5.8 | 7.1 |
| 75 | 2.9 | 3.6 | 4.5 | 5.6 | 6.8 | 8.4 |
| 90 | 3.5 | 4.3 | 5.4 | 6.7 | 8.2 | 10.1 |
| 110 | 4.2 | 5.3 | 6.6 | 8.1 | 10.0 | 12.3 |
| 125 | 4.8 | 6.0 | 7.4 | 9.2 | 11.4 | 14.0 |
| 140 | 5.4 | 6.7 | 8.3 | 10.3 | 12.7 | 15.7 |
| 160 | 6.2 | 7.7 | 9.5 | 11.8 | 14.6 | 17.9 |
| 180 | 6.9 | 8.6 | 10.7 | 13.3 | 16.4 | 20.1 |
| 200 | 7.7 | 9.6 | 11.9 | 14.7 | 18.2 | 22.4 |
| 225 | 8.6 | 10.8 | 13.4 | 16.6 | 20.5 | 25.2 |
| 250 | 9.6 | 11.9 | 14.8 | 18.4 | 22.7 | 27.9 |
| 280 | 10.7 | 13.4 | 16.6 | 20.6 | 25.4 | 31.3 |
| 315 | 12.1 | 15.0 | 18.7 | 23.2 | 28.6 | 35.2 |
| 355 | 13.6 | 16.9 | 21.1 | 26.1 | 32.2 | 39.7 |
| 400 | 15.3 | 19.1 | 23.7 | 29.4 | 36.3 | 44.7 |
| 450 | 17.2 | 21.5 | 26.7 | 33.1 | 40.9 | 50.3 |
| 500 | 19.1 | 23.9 | 29.7 | 36.8 | 45.4 | 55.8 |
| 560 | 21.4 | 26.7 | 33.2 | 41.2 | 50.8 | 62.5 |
Read the table from a production standpoint rather than a design standpoint and the equipment implications become obvious. A 63 millimeter SDR11 pipe carries a 5.8 millimeter wall and can be cooled in a nine meter tank at eight meters per minute. A 450 millimeter SDR11 pipe carries a 40.9 millimeter wall — seven times the mass per unit length in the radial direction — and cannot be cooled at anything like that speed without freezing a hard skin over a molten core. The line length, the number of cooling tanks, the vacuum staging and the haul-off force all scale with that wall thickness, which is why a single machine cannot economically cover the whole diameter range and why Faygo configures fire pipe lines in diameter tiers rather than as one universal machine.
Temperature derating is the final piece of the pressure rating puzzle and it matters for fire mains routed through boiler rooms, near steam lines or in hot climates where buried pipe can reach 30 to 40 degrees Celsius. Polyethylene loses hydrostatic capability as temperature rises; a pipe rated PN16 at 20 degrees Celsius retains roughly 87 percent of that rating at 30 degrees Celsius and around 74 percent at 40 degrees Celsius. Designers handle this by selecting a heavier SDR class rather than by changing material, which again pushes production toward thick-wall SDR11 and SDR9 output and reinforces the need for a line built around slow, staged, stress-free cooling.
Fire Resistance and Flame Retardant Routes for HDPE Fire Pipe
Fire resistance in an HDPE fire fighting pipeline is achieved by system design, not by the polymer alone. Unmodified high density polyethylene is a combustible material with a limiting oxygen index of roughly 17 to 18 percent, meaning it sustains combustion in normal air. Engineering practice therefore uses four established routes to make polyethylene acceptable in fire service piping, and a pipe manufacturer needs to understand all four because each one changes what the customer orders and what the extrusion line must be capable of producing.
경로 1: 매립 및 백필. The dominant and simplest route. A fire main buried at 800 to 1500 millimeters of cover in compacted backfill has no oxygen supply and no exposure to radiant heat. Standards for private fire service mains recognize buried polyethylene precisely on this basis. The pipe carries its pressure rating; the soil carries the fire protection function. For the manufacturer this means the overwhelming majority of HDPE fire pipe sold is standard PE100 pressure pipe with red identification, produced on a conventional high-output pressure pipe line with no flame retardant compounding at all.
경로 2: 콘크리트 케이싱.화재 메인이 건물 슬라브 아래, 플랜트 룸을 가로지르는, 또는 등급에서 밸브 챔버로 상승해야 하는 경우, 파이프는 콘크리트 주변에 주조됩니다. 콘크리트는 화재 분리와 기계적 보호 기능을 제공합니다. 여기에서 압출 요구 사항은 치수에 관한 것입니다. 파이프는 허용 내에 있어야 하며, 적당히 직선되어 콘크리트 포밍에서 중앙으로 지지될 수 있어야 합니다.
세 번째 경로: 보호 슬리빙 및 화재 포장.수직 전환 및 짧은 노출 부위는 강철 슬리브, 광석wool 화재 랩, 또는 지정된 기간 동안 화재 저항성을 갖춘 인툭전스런 밴지로 보호됩니다. 일부 프로젝트는 트렌치리스 설치 시 기계적 견고성을 위해 파이프 자체에 동시 압출된 보호 외피를 사용합니다. 이는 진정한 압출 라인 기능이며, 다이 헤드에 동시 압출 채널을 공급하는 두 번째, 더 작은 압출기를 필요로 합니다.
네 번째 경로: 방화성 혼합. This is the route people mean when they say “fire resistant HDPE pipe,” and it is the one most often misapplied. A halogen-free flame retardant polyethylene compound uses magnesium hydroxide or aluminum hydroxide as the active filler. Both work by endothermic decomposition: they absorb heat and release water vapor that dilutes the combustible gas phase, while the residual oxide forms an insulating char barrier. Aluminum hydroxide decomposes near 200 degrees Celsius, which is below normal HDPE processing temperature, so it is restricted to low-temperature processing; magnesium hydroxide decomposes near 330 degrees Celsius and is the correct choice for polyethylene extruded at 200~215도. Achieving a limiting oxygen index of 28 to 32 percent and a UL 94 V-0 direction of performance requires filler loadings in the range of 45 to 60 percent by weight.
이러한 적재 수준에는 공급업체가 고객에게 숨길 수 없는 결과가 있습니다. 아래 표는 미네랄 하이드록사이드 함량이 증가함에 따라 폴리머가 어떻게 변하는지 요약하고, 왜 방화성 폴리염화비닐이 보호용 콘duit, 케이블 덕트, 케이싱 파이프 및 재킷용으로 지정되는지 설명합니다.
| 재질 | Unmodified PE100 | 45 percent Loading | 60 percent Loading | Production Consequence |
|---|---|---|---|---|
| Limiting oxygen index | 17 to 18 percent | 26~28% | 30 to 34 percent | Target property; verified per ISO 4589 on molded bars from the same batch |
| Vertical burning behavior | Burns with dripping | V-2 to V-1 direction | V-0 direction achievable | UL 94 classification is thickness-dependent; state the tested thickness |
| 190도에서 5kg의 용융 유동률 | 0.2 to 0.5 g/10 min | Drops 30 to 50 percent | Drops 50 to 70 percent | Higher melt viscosity; needs deeper screw channels and higher torque |
| Elongation at break | Above 600 percent | 200 to 350 percent | 80 to 200 percent | May fall below the 350 percent minimum required for pressure pipe |
| Long-term hydrostatic strength | MRS 10.0 MPa | Not classifiable as PE100 | Not classifiable as PE100 | Filled compound cannot carry a PN rating; use for non-pressure duty |
| Notched impact strength | High, ductile failure | Reduced 40 to 60 percent | Reduced 60 to 80 percent | Brittle handling risk in cold weather; coupling agent treatment essential |
| 밀도 | 0.949에서 0.960 g/cm3 | 1.35 to 1.45 g/cm3 | 1.55 to 1.70 g/cm3 | Output in kg/h rises for the same volumetric rate; recalculate line speed |
| 스크류 및 배럴 wear | 저전압 | 중간 | 높은 수준 | Bimetallic barrel lining and nitrided or alloy-coated screw recommended |
| Relative compound cost | 중간 | 높은 수준 | 매우 높은 등급 | Justified only where an exposed run genuinely requires it |
The engineering conclusion is a division of labor. The pressure-bearing fire main is unfilled PE100 or PE100-RC, pressure rated, buried or encased, and colored red for identification. Where a genuinely flame retardant polyethylene product is required — a protective casing around a riser, a cable and pipe duct in a plant room, a sleeve through a fire compartment wall — it is produced as a separate non-pressure article from a compounded flame retardant grade. A well-specified extrusion line can produce both, but not with the same screw, the same die gap and the same process recipe. This is why Faygo supplies fire pipe lines with an interchangeable screw and die package when a customer intends to run both product families on one machine.
화염 retardant polyethylene을 처리하면 자체 규정이 적용됩니다. 광석 성분으로 인해 이 물질은 습윤성이므로 80~90도에서 2~3시간 동안 건조시켜 수분 함량을 0.05% 이하로 낮추어야 합니다. 그렇지 않으면 벽에 미세한 기포가 생기고 화염 retardant 성능이 저하됩니다. 용융 온도는 220도 이하로 유지해야 불순물인 수소화물이 조기 분해되지 않습니다. 스크류 설계는 낮은 압축 비율과 긴 측정 섹션을 우선시하여, 강제 혼합보다 분산 혼합을 중시합니다. 충전제 입자가 50마이크로미터 이상인 경우 응력 집중체로 작용하므로, 충전 polyethylene 파이프의 예상치 않은 수압 시험 실패의 가장 일반적인 원인은 바로 이 입자입니다.
Color identification is a smaller but frequently mishandled detail. A fully red pipe body needs 2 to 4 percent red masterbatch dosed at the throat by a gravimetric feeder, and the pigment must be carried in a polyethylene base compatible with the pipe grade. Co-extruded red stripes — usually three or four equally spaced lines — are the more economical option for large diameters and are produced by a small stripe extruder of 30 to 45 millimeter screw diameter feeding a stripe adapter ahead of the die. Stripes must be fully fused into the outer wall, not merely laid on the surface; a stripe that delaminates during butt fusion is a rejection point on site.
완전한 압출 라인 구성, Stage by Stage
A high pressure HDPE fire 파이프 압출 라인 is a synchronized chain of nine functional stages, and the output quality is set by the weakest link rather than by the largest machine. The chain runs from centralized vacuum feeding through the extruder, die head, vacuum calibration tank, cooling tank train, caterpillar haul-off, on-line wall thickness measurement, 행성형 절단기 and finally the tilting table or coiler. Every stage below is described with the specifications that matter for thick-wall pressure pipe rather than for thin-wall duct.
단계 1: 중앙 집중식 진공 공급 및 손실 중량 측정
Material handling is where fire pipe quality begins. A centralized vacuum feeding system draws PE100 pellets from silos or bulk bags through stainless steel piping to hopper receivers above the extruder throat. For fire pipe the system must include three functions beyond simple conveying. First, a magnetic separator and a metal detector in the material path, because a single steel fragment through the die head scores the mandrel and produces a permanent longitudinal groove in every meter of pipe afterward. Second, a drying hopper — PE100 pipe compound is not strongly hygroscopic, but pellets stored in cold warehouses and moved into a humid workshop carry surface condensation that becomes steam voids at 200 degrees Celsius; two hours at 80 degrees Celsius with dehumidified air eliminates the problem. Third, loss-in-weight gravimetric metering rather than volumetric dosing, so that the red masterbatch and any additive stream are dosed by mass with a deviation below 0.5 percent, and so the line records actual kilograms per hour for traceability.
Gravimetric control brings a second benefit that pays for itself on thick-wall pipe. When the loss-in-weight feeder, the extruder drive and the haul-off are linked in a closed loop, the control system can hold constant mass per meter of pipe. That is the true economic target: pipe that meets minimum wall everywhere while carrying the smallest possible positive tolerance. On a 315 millimeter SDR11 line, trimming average overweight from 6 percent to 3 percent saves roughly 2.7 kilograms of PE100 per meter of pipe produced, which across a production year is a very large number.
Stage 2: 단일 스크류 압출기 with barrier screw and grooved feed bushing
The extruder is the heart of the line. High pressure pipe production uses a single-screw extruder with a length-to-diameter ratio of 33, a grooved feed bushing section, and a barrier screw with a mixing element in the metering zone. Each of those three choices is deliberate.
The L/D of 33 provides enough residence length to melt fully, homogenize thermally and build stable pressure without excessive shear history. Shorter machines at 25 or 28 L/D can push similar throughput but deliver a melt with wider temperature variation across the cross-section, which shows up as wall thickness drift and internal stress. The grooved feed bushing — a hardened, axially grooved liner in the first three to five diameters of the barrel, intensively water-cooled — converts the feed section from a friction-dependent drag pump into a positive-displacement conveyor. The result is that output becomes almost independent of head pressure, which is exactly what a thick-wall pipe line needs when die pressure rises from 20 to 35 MPa as the die gap narrows.
The barrier screw separates the solid bed from the melt pool with a secondary flight, forcing all unmelted polymer through a narrow barrier clearance where it melts by conduction and controlled shear. Compared with a conventional three-zone screw, a barrier design delivers a lower and more uniform melt temperature at the same throughput — typically 5 to 12 degrees Celsius lower peak melt temperature — which directly reduces thermal degradation and preserves oxidation induction time. A distributive mixing element such as a pineapple or spiral mixer in the metering section homogenizes the color masterbatch and eliminates the streaking that otherwise appears on red fire pipe.
| Screw Diameter / L/D | 출력 범위 (kg/h) | Main Drive (kW) | Screw Speed (rpm) | Matched 파이프 직경 (mm) |
|---|---|---|---|---|
| 75 mm / 33 L/D | 300 to 450 | 90 to 110 | 10 to 90 | 20 to 160 |
| 90 mm / 33 L/D | 450 to 700 | 132에서 160 | 10 to 85 | 63 to 250 |
| 120 mm / 33 L/D | 800 to 1200 | 250 to 315 | 8 to 80 | 160 to 575 |
| 30 to 45 mm stripe unit | 8 to 30 | 7.5에서 15까지 | 15 to 100 | All sizes, red stripe co-extrusion |
Stage 3: Die head — spider, basket or spiral mandrel
The die head converts an annular melt stream into a pipe wall of uniform thickness and uniform thermal and mechanical history. Three architectures exist and the choice depends on diameter and quality target.
A spider die supports the mandrel on radial legs. It is mechanically simple and the most economical option, but each leg splits the melt and the streams must reweld downstream, leaving weld lines that remain visible on the inner wall and represent a small but real reduction in long-term hydrostatic strength. Spider designs remain acceptable for small diameters and lower pressure classes, and Faygo supplies them where the customer’s product range genuinely does not need more.
바구니 다이에서는 다리가 제거되고 그 대신 다수의 작은 구멍이 있는 원통형 바구니가 사용됩니다. 이 바구니는 용융물을 빠르게 다시 결합시킵니다. 용접 라인은 많지만 개별적으로 약하므로, 전체적인 벽 강도에는 스파이더에 비해 훨씬 작은 영향을 미칩니다. 바구니 다이들은 315~575밀리미터의 화재 파이프를 잘 처리하며, 315~575밀리미터 화재 파이프의 표준 선택입니다.
A spiral mandrel die distributes melt through helical channels of decreasing depth machined into the mandrel. Melt migrates continuously between channels, so the weld lines dissipate almost completely and the circumferential melt distribution uniformity reaches the highest level available — typically within 2 percent. Spiral dies cost more and hold more melt volume, which lengthens color changeover, but for premium fire pipe with tight ovality and wall tolerance requirements they are the correct specification.
Regardless of architecture, three die head features are mandatory for fire pipe. Independent temperature zones on the die body, adapter and lip, each with its own heater and thermocouple, so the operator can bias the melt temperature to correct thickness distribution. Adjustable die lip centering bolts for mechanical concentricity correction. And a streamlined internal flow path with no dead zones — stagnant melt in a corner degrades over hours, then releases as a black speck that becomes a defect and, in a pressure pipe, a potential crack initiation point.
Stage 4 to 9: Downstream chain
하위 장비는 두꺼운 벽 화재 파이프 생산이 얇은 벽 통로 생산과 가장 크게 다른 부분입니다. 아래 표에는 전체 체인과 중요한 사양이 나열되어 있으며, 다음 섹션에서는 보정과 냉각에 대해 더 자세히 설명합니다. 이 부분에서 품질 문제가 발생하는 주요 요소가 바로 이 부분입니다.
| Stage | 기능 | Key 사양 | Failure Mode If Under-Specified |
|---|---|---|---|
| 진공 교정 탱크 | Fixes outside diameter and rounds the pipe | Multi-stage vacuum from minus 0.02 to minus 0.08 MPa, spray plus immersion sections, servo length adjustment | 오목도가 허용치 밖입니다., diameter drift, pipe collapse on large sizes |
| Cooling tank train | 벽에서 남은 열을 제거합니다. | 총 길이 9~18미터로 3미터 단위로 나뉘며, 18~12도 사이의 단계별 수온을 갖는 고 용량 스프레이 노즐을 사용합니다. | 잔여 내부 응력, 압출 후 수축, 응력 균열 |
| 캐터필러 덤프장 | Pulls pipe at constant, precise speed | 4, 6 or 8 tracks, 20 to 60 kN pulling force, 0.3 to 12 m/min, servo synchronized | Slip marks, speed hunting, wall thickness oscillation, pipe stretching |
| 온라인 두께 게이지 | Measures wall and diameter continuously | 초음파 다중 헤드 또는 레이저 직경, 폐쇄 루프를 통해 운반 및 나사 속도 | Undetected thin wall, batch rejection at hydrostatic test |
| Marking unit | Prints traceability data on the pipe | Inkjet or hot-foil, meter counter linked, prints grade, SDR, PN, standard, timestamp | Loss of traceability, rejection at project acceptance |
| 행성형 절단기 | Cuts to length without chips | Chipless planetary knife, squared cut face, integrated chamfering option | Chips inside the pipe, out-of-square face causing butt fusion defects |
| 기울기 테이블 | Discharges cut lengths for stick production | 6~12m 길이, 공압 팁핑, 패딩 크래들 | Surface damage, pipe bowing, manual handling injury risk |
| Coiler | Winds small-diameter pipe into coils | For 63 to 110 mm, tension controlled, strapping station | Coil-set ovality, kinking, wall deformation at the inner turn |
다이 헤드, 진공 교정 및 냉각 엔지니어링
교정 및 냉각은 두꺼운 벽 방화 파이프가 크기상 정확하고 내부적으로 이완된 상태로 또는 크기상 정확하고 내부적으로 긴장된 상태로 배달되는지 여부를 결정합니다. 이 섹션에서는 물리학과 실제 설정 방법을 설명합니다.
용융 튜브가 다이 립을 떠날 때 약 200~215℃의 온도와 부드러운 상태이며, 완성된 파이프보다 직경이 더 크다. 이는 드로우 다운 비율에 따라 결정된다. 용융 튜브는 캘리브레이션 슬리브에 들어가는데, 주변 챔버의 진공으로 외부 표면이 슬리브 구멍에 밀착되고, 물 분사기로 인해 외부 표면의 열이 빠르게 제거된다. 슬리브의 처음 200~400mm에서 단단한 외부 껍질이 형성되고, 그 순간부터 외부 직경은 고정된다. 이후의 모든 과정은 벽 내부의 열을 제거하는 것인데, 차별적인 수축이 발생하지 않도록 한다.
Vacuum staging is the first control lever. A single vacuum level across the whole tank is a compromise that fails at both ends of the diameter range. Fire pipe lines use multi-stage vacuum: a lower level of minus 0.02 to minus 0.04 MPa in the first chamber where the melt is still very soft and excessive vacuum would draw the wall into contact grooves and mark the surface, then a higher level of minus 0.05 to minus 0.08 MPa in later chambers where the shell has formed and the objective is holding roundness against the weight of the pipe itself. On a 500 millimeter pipe the self-weight of the still-warm section is enough to flatten the crown if vacuum is inadequate, which appears as a systematic ovality with the minor axis vertical.
교정 슬리브 자체는 정밀한 부품입니다. 지표 외부 직경에서 벽 두께에 대한 수축 허용치를 고려하여 지표 직경에서 계산됩니다. 일반적으로 벽 두께에 따라 1.5~3%입니다. 그 내부 표면에는 진공 슬롯과 물 groove 패턴이 있으며, 진공을 균일하게 분배하기에 충분히 깊어야 하지만 파이프 표면을 각인시키지 않도록 충분히 얇아야 합니다. 슬리브 길이는 벽 두께와 비례하여 첫 단계에서 벽 두께의 6~10배입니다. 다이 헤드와 교정 탱크의 상대적인 위치가 서보 드라이브로 조절되어, 작업자가 공기 간격을 30~120mm로 조정할 수 있습니다. 이는 오벌성 및 표면 품질을 제어하는 데 있어 전체 라인에서 가장 민감한 조절 중 하나입니다.
냉각 기울기는 두 번째로 중요한 제어 레버이며, 경험이 부족한 생산업체가 품질 저하를 일으키면서 생산성을 높이는 것으로 믿는 곳입니다. 폴리염화비닐의 열 전도율은 약 0.4W/mK입니다. 열은 40mm 두께의 벽에서 표면으로만 전도할 수 있으며, 물이 얼마나 차가운지와 관계없이 시간이 걸립니다. 8℃의 물을 적용하면 두꺼운 벽의 외부 층이 180℃의 녹은 상태로 굳어지고, 그 결과 코어가 냉각되고 수축하면서 이미 굳은 껍질에 의해 제어됩니다. 코어가 이후 냉각되고 수축하면 이미 굳은 껍질에 의해 억제되며, 그 결과 내부에는 긴장 잔류 응력 분야가 생기고 표면에서는 압축이 발생합니다. 이러한 고정 된 응력은 저장 중 수직 균열, butt 용접 중 벽 분리 및 서비스 중 조기 환경 응력 균열의 직접적인 원인입니다.
The correct approach is a staged temperature gradient along the tank train. The first cooling tank runs at 18 to 20 degrees Celsius, the middle tanks step down through 16 and 14 degrees Celsius, and the final tank runs at 12 degrees Celsius. Total in-water length of 9 meters serves diameters up to about 250 millimeters; 12 to 15 meters is needed for 315 to 450 millimeters; and 15 to 18 meters is appropriate for 500 to 575 millimeter thick-wall pipe. The pipe should exit the last tank with a surface temperature below 40 degrees Celsius and, more importantly, with a core temperature below the crystallization range so that no further dimensional change occurs on the tilting table.
유용한 검증 방법은 비용이 들지 않습니다: 완성된 파이프에서 링을 자르고 수직으로 슬릿을 내고 간격을 측정합니다. 상당히 크게 열리는 링은 과도한 냉각으로 인한 높은 호퍼 응력이 있음을 나타냅니다. 잘 냉각된 두꺼운 벽 파이프는 거의 움직이지 않습니다. 하루에 한 번 이 검사를 수행하는 생산 팀은 수압 시험 연구소에서보다 며칠 전에 냉각 문제를 포착할 수 있습니다.
압력 파이프의 경우, 다이 형상을 냉각 결과와 연결하는 드로우다운 비율(DDR, draw-down ratio)은 다이 안주면 단면적과 완성된 파이프 벽 단면적의 비율입니다. 압력 파이프의 경우 작업 창은 1.05~1.15입니다. 1.05 미만일 경우 용융물이 거의 끌어지지 않으며 표면 품질이 저하됩니다. 다이 립의 자체 결함이 파이프로 직접 전송됩니다. 1.2 이상일 경우 폴리머 사슬이 축 방향에 지나치게 정렬되어 수직 재반응이 증가하고, 호퍼 강도가 감소하며, 파이프가 3%의 수직 재반응 한계를 초과할 수 있습니다. 드로우 균형 — 직경 드로우와 벽 드로우의 비율 —은 파이프가 비례적으로 드로우되도록 유지되어야 합니다.
두꺼운 벽 압력 파이프의 프로세스 매개 변수 창
Process parameters for high pressure HDPE fire pipe sit in a narrower window than for general water pipe because the product must pass long-duration hydrostatic testing and retain oxidation induction time. The table below gives working ranges validated in production for PE100 pipe compound on a 33 L/D barrier screw line. Treat them as a starting recipe to be refined against the specific compound, not as absolute values.
| 매개변수 | 얇은 벽(SDR17 ~ SDR26) | 두꺼운 벽 (SDR11~SDR9) | Control Note |
|---|---|---|---|
| 배럴 영역 1 (피드) | 175 to 185 degrees Celsius | 175~190도 | 주름 부싱은 별도로 30 ~ 45도 섭씨 온도로 냉각됩니다. |
| Barrel zones 2 to 4 | 185~200°C | 190 to 205 degrees Celsius | 상승 프로필; 뜨거운 스파이크가 발생하여 항산화제가 손상되지 않도록 한다 |
| Barrel zones 5 to 7 (metering) | 195 to 208 degrees Celsius | 200~215도 | Flat or slightly falling toward the die for melt uniformity |
| Adapter and screen changer | 195~205도 | 200 to 210 degrees Celsius | Screen pack 40/80/40 mesh typical; change on pressure rise of 3 MPa |
| Die head zones | 195 to 208 degrees Celsius | 200~215도 | Individual zone bias corrects thickness distribution around the circumference |
| Die lip | 200 to 210 degrees Celsius | 205 to 215 degrees Celsius | A cool lip causes shark skin; an over-hot lip causes sag on large diameters |
| 융해 온도 | 200 to 210 degrees Celsius | 205 to 215 degrees Celsius | Measure with an immersion probe, not from barrel setpoints |
| 녹는 압력 | 20 to 28 MPa | 25 to 35 MPa | Fluctuation above 1 MPa indicates feed surging or screw wear |
| Draw-down ratio | 1.08 to 1.15 | 1.05 to 1.12 | Higher DDR raises axial orientation and longitudinal reversion |
| Vacuum stage 1 | minus 0.02 to minus 0.04 MPa | minus 0.03 to minus 0.05 MPa | Too high marks the surface; too low loses diameter control |
| Vacuum stage 2 and 3 | minus 0.04 to minus 0.06 MPa | minus 0.05 to minus 0.08 MPa | Large diameters need the upper end to resist self-weight flattening |
| 교정 용수 temperature | 14 to 18 degrees Celsius | 18 to 20 degrees Celsius | Warmer first stage prevents shell freezing on thick walls |
| Cooling tank gradient | 16 down to 12 degrees Celsius | 18 down to 12 degrees Celsius | Step 2 degrees Celsius per tank section; never shock-cool |
| Air gap, die lip to sleeve | 30 to 80 mm | 60 to 120 mm | Servo adjustable; retune after every die change |
| 하우 오프 속도 | 1.5 to 12 m/min | 0.3 to 3 m/min | Speed stability within 0.5 percent is more important than absolute speed |
| Haul-off clamping pressure | 0.15 to 0.3 MPa | 0.25 to 0.5 MPa | Excess pressure ovalizes warm pipe; insufficient pressure allows slip |
| Compound drying | Optional, 2 h at 80 degrees Celsius | 2 to 3 h at 80 to 90 degrees Celsius | Mandatory for filled or regrind-containing compounds |
Two parameters deserve particular attention on fire pipe. 녹는 압력 stability is a direct proxy for wall thickness stability; a pressure trace that oscillates by more than about 1 MPa peak to peak will produce a visible periodic wall variation that the ultrasonic gauge will pick up as a sine wave in the thickness log. Common causes are feed section surging from inconsistent pellet bulk density, a worn screw flight allowing back-leakage, or a partially blocked screen pack. Second, melt temperature must be measured, not assumed. An immersion thermocouple in the adapter reading actual melt temperature frequently differs from the average barrel setpoint by 8 to 15 degrees Celsius because of shear heating, and on thick-wall production that difference is the gap between a compliant oxidation induction time and a failing one.
Faygo HDPE Fire Pipe 압출 라인 구성s and 사양s
Faygo builds HDPE fire 파이프 압출 라인s as complete turnkey systems configured by diameter tier, because a single machine cannot economically serve both 63 millimeter coil pipe and 575 millimeter thick-wall stick pipe. The core pipe extrusion capability spans 12 to 575 millimeters across PE, PP and PVC materials, and the fire pipe configurations described below are drawn from that platform with the die head, calibration, cooling length and haul-off sized for pressure-class polyethylene. All lines are CE and ISO certified, use internationally recognized brand electrical components, and receive 72시간 연속 작동 testing before shipment.
구성 A: mid-range fire main line, 63 to 250 mm
This is the highest-volume configuration in the commercial building market. It covers the diameters used for hydrant branch lines, sprinkler supply headers, pump room connections and the majority of underground loops on small and medium developments. Built around a 90 millimeter 33 L/D barrier screw extruder, it produces SDR11 PN16 pipe across the whole range and can be switched to SDR17 for the larger sizes. Coiling is available for 63 to 110 millimeter output, which is a significant advantage on projects where long uninterrupted buried runs reduce the number of fusion joints.
| 품목 | 사양 |
|---|---|
| 파이프 직경 범위 | 63 to 250 mm outside diameter |
| Pressure classes | SDR26 through SDR9, PN6 to PN20, PE100 and PE100-RC |
| Maximum wall thickness | 28 mm |
| 주 압출기 | 90 mm single-screw, 33 L/D, barrier screw with distributive mixer, grooved feed bushing |
| 최대 출력 | 700 kg/h on PE100 |
| Stripe co-extruder | 30 mm, 25 L/D, three or four red identification stripes |
| Die head | Spiral mandrel, independently zoned, adjustable lip centering |
| 진공 교정 탱크 | 6 m, two vacuum stages, spray plus immersion, servo positioning |
| Cooling tank train | 9 to 12 m in 3 m sections, independent temperature control per section |
| Haul-off | Six-track caterpillar, 30 kN pulling force, 0.3 to 12 m/min servo drive |
| 벽 두께 control | Ultrasonic multi-head gauge, closed loop to haul-off and screw speed |
| Cutting | Chipless 행성형 절단기 with chamfering, 6 to 12 m lengths |
| Take-off | 기울기 테이블, plus optional coiler for 63 to 110 mm |
| Total installed power | Approximately 260 to 310 kW |
| Line length | Approximately 38 to 45 m |
| 제어 장비 | Central PLC with touch screen HMI, recipe management, data logging, remote diagnostics |
구성 B: large-diameter fire main line, 160 to 575 mm
This configuration serves the underground ring main and fire pump header market — the large buried loops around shopping complexes, logistics parks, industrial estates and campus developments where a single main must feed dozens of hydrants and multiple riser connections. It is built around a 120 millimeter 33 L/D barrier screw extruder with a basket die head, extended vacuum staging and a cooling train up to 18 meters. Because thick-wall large-diameter pipe moves slowly, output economics depend on holding a low positive wall tolerance, which is why the closed-loop ultrasonic gauge is standard rather than optional on this tier.
| 품목 | 사양 |
|---|---|
| 파이프 직경 범위 | 160 to 575 mm outside diameter |
| Pressure classes | SDR26 through SDR11, PN6 to PN16, PE100 and PE100-RC |
| Maximum wall thickness | 52 mm |
| 주 압출기 | 120 mm single-screw, 33 L/D, barrier screw, grooved feed bushing, bimetallic barrel |
| 최대 출력 | 1200 kg/h on PE100 |
| Stripe co-extruder | 45 mm, 25 L/D, four red identification stripes |
| Die head | Basket type with streamlined flow path, spiral option for premium grades |
| 진공 교정 탱크 | 9 m, three vacuum stages minus 0.02 to minus 0.08 MPa, servo positioning |
| Cooling tank train | 15 to 18 m in 3 m sections, stepped 18 to 12 degrees Celsius |
| Haul-off | Eight-track caterpillar, 60 kN pulling force, 0.3 to 6 m/min servo drive |
| 벽 두께 control | Ultrasonic multi-head gauge plus laser diameter measurement, full closed loop |
| Cutting | Heavy-duty chipless 행성형 절단기 with internal chip extraction and chamfering |
| Take-off | 수동 기울기 테이블, 6~12m 길이, 패딩 크래들 |
| Total installed power | Approximately 460 to 560 kW |
| Line length | Approximately 55 to 68 m |
| 제어 장비 | Central PLC, recipe management, energy monitoring, remote diagnostics, production data export |
Faygo also builds a small-diameter configuration on a 75 millimeter 33 L/D extruder covering 20 to 160 millimeters at 300 to 450 kg/h for hydrant branch lines, fire hose reel supply and protective conduit work, and can supply a dedicated flame retardant compound line where a customer needs to produce filled non-pressure casing and sleeving alongside the pressure pipe range. The related PP-R and PE-RT pipe extrusion platform covering 16 to 160 millimeters is available where a producer also serves building services heating and hot water piping from the same workshop, and the single wall corrugated pipe platform covering 6 to 200 millimeters covers protective conduit needs. For upstream compounding, masterbatch preparation or scrap reprocessing capability, Wanplas supplies matched twin-screw compounding systems and recycling equipment that integrate with a Faygo pipe workshop as part of a single turnkey project.
How to Select the Right Line for Your Production Target
Line selection for fire pipe production follows three inputs in order: the diameter and pressure class mix you must supply, the daily tonnage your market demands, and the delivery format your customers accept. Everything else — extruder size, cooling length, haul-off force, floor space — derives from those three. The table below maps common commercial building fire pipeline production scenarios to a recommended Faygo configuration.
| Target 직경 범위 | 압력 등급 | Daily Output Target | Recommended Faygo 구성 | Key Options to Add |
|---|---|---|---|---|
| 20 ~ 110mm branch and hose reel pipe | PN16, SDR11 | 5 to 8 tons | 75 mm / 33 L/D small-diameter line, 300 to 450 kg/h | Dual-strand die for 20 to 63 mm, coiler, stripe unit |
| 63 to 160 mm hydrant and sprinkler supply | PN16, SDR11 | 8 to 12 tons | 구성 A with 9 m cooling train | Coiler for 63 to 110 mm, ultrasonic gauge, inkjet marking |
| 63 to 250 mm mixed commercial range | PN10 and PN16 | 12 to 16 tons | 구성 A with 12 m cooling train, 700 kg/h | Second die set, quick die change cart, spiral die head |
| 160 to 355 mm buried ring main | PN10 and PN16 | 16 to 22 tons | 구성 B with 15 m cooling train, 900 to 1000 kg/h | Three-stage vacuum, eight-track haul-off, laser diameter gauge |
| 315 to 575 mm main header and pump line | PN10 and PN16 | 20 to 28 tons | 구성 B fully specified, 18 m cooling train, 1200 kg/h | Basket or spiral die, chip extraction cutter, hydraulic tilting table |
| Non-pressure flame retardant casing and sleeving | Non-rated, LOI 28 to 32 percent | 3 to 6 tons | Dedicated filled-compound line, 75 mm / 33 L/D, low compression screw | Bimetallic barrel, wear-resistant screw, drying hopper, deeper screen pack |
| Mixed fire pipe plus building services piping | PN16 plus PP-R and PE-RT classes | 10 to 15 tons combined | 구성 A plus a PP-R/PE-RT line for 16~160mm | Interchangeable screw package, shared central feeding and chiller plant |
| New factory, full commercial fire pipe range | PN10 to PN20, 63 to 575 mm | 35 to 45 tons | 구성 A and 구성 B running in parallel | Shared central feeding, shared chiller plant, factory layout and utility design service |
Three selection mistakes recur often enough to be worth naming. The first is buying an extruder sized for the average product and then discovering that the thickest wall in the range runs at a crawl because the cooling train, not the extruder, is the bottleneck. On thick-wall pipe, cooling capacity sets the line speed; adding two more cooling tank sections is usually a far better investment than moving up an extruder size. 두 번째는 under-specifying haul-off force. A 500 millimeter SDR11 pipe in an 18 meter water train carries substantial drag, and an under-forced caterpillar slips intermittently, producing a wall thickness ripple that no amount of screw speed tuning can remove. The third is treating the on-line thickness gauge as an optional extra. On a PN16 product the gauge pays for itself through material savings alone, and on a life safety product it is the primary evidence that every meter shipped met minimum wall.
Utility planning should be settled at the quotation stage, not at installation. A 구성 B line at full output needs chilled water capacity in the range of 180 to 240 kilowatts of heat rejection, a vacuum pump set matched to three-stage staging, compressed air for pneumatics and marking, and a floor with a level tolerance suitable for a 60 meter machine axis. Faygo provides water and electricity design and 3D workshop layout as part of its factory consulting service, which removes the most common source of commissioning delay: a line that arrives before the workshop can support it.
품질 테스트ing, Release Criteria and Type Testing
Fire pipe is a life safety product, so the test regime is stricter than the extrusion team’s own process checks. Testing splits into three tiers: in-line monitoring that runs continuously, routine release testing performed per batch or per shift before pipe leaves the factory, and type testing performed when a new material, new size or new process recipe is introduced. The table below sets out the full program with typical acceptance criteria drawn from the polyethylene pressure pipe standards.
| 테스트 | Condition | Typical Acceptance Criterion | 계층 |
|---|---|---|---|
| 외부 직경 | 주변 측정 테이프 또는 레이저 측정기 | Mean OD within the standard grade tolerance, no negative deviation | In-line and release |
| 벽 두께 | Ultrasonic multi-head, minimum of eight points | No point below nominal minimum; positive tolerance controlled to 3 to 6 percent | In-line and release |
| Ovality | Maximum minus minimum diameter at pipe end | Within the standard limit for the size; typically below 2 percent for stick pipe | Release |
| 수압 강도, short term | 20 degrees Celsius, 100 hours, hoop stress 12.4 MPa | 고장 없음, 누출 없음, 풍선화 없음 | Release |
| 수압 강도, intermediate | 80 degrees Celsius, 165 hours, hoop stress 5.4 MPa | No failure; ductile failure permitted only beyond the required time | Type and periodic |
| 수압 강도, long term | 80 degrees Celsius, 1000 hours, hoop stress 5.0 MPa | 부서지지 않는 결함 없음; the key indicator of correct processing | Type |
| Melt mass-flow rate change | Compound versus finished pipe, 190 degrees Celsius / 5 kg | Change no greater than 20 percent | Release |
| 산화 유도 시간 | 200 degrees Celsius, oxygen atmosphere | Not less than 20 minutes | Release |
| Longitudinal reversion | 110 degrees Celsius oven or liquid bath | Not greater than 3 percent, no cracking, no blistering | Release |
| Elongation at break | 가공된 시편에 대한 인장 시험s | Not less than 350 percent | Type and periodic |
| 느린 균열 성장 저항력 | Notched pipe test, 80 degrees Celsius, 4.0 MPa | Minimum 500 hours without failure | Type |
| Rapid crack propagation | Small-scale steady state or full-scale test at 0 degrees Celsius | 설계 최대 작동 압력보다 높은 임계 압력 | Type, large diameters |
| 탄소 블랙 또는 색소 분산제 | Microtome section, optical microscopy | 3등급 이상, no agglomerate above the size limit | Release |
| Limiting oxygen index | Per ISO 4589, flame retardant grades only | Not less than 28 percent, project-specific target up to 32 percent | 풀어 놓은 제품 |
| Vertical burning behavior | Per UL 94 on specimens of stated thickness | V-0 direction where the project specification requires it | Type, filled products |
| 마킹의 가독성 및 내용 | Visual, abrasion check | 등급, 직경, SDR, PN, 표준, 배송 일 및 타임스탬프가 모두 읽기 쉽고 내구성이 강합니다 | Release |
이 두 가지 테스트는 비례하지 않는 진단 가중치를 가지고 있습니다. 산화 유도 시간은 가공에서 얼마나 많은 항산화제가 살아남았는지 직접 측정하는 것입니다. 20분 미만의 결과는 거의 항상 과도한 용융 온도, 설계 출력의 훨씬 아래에서 큰 압출기를 실행하는 것, 또는 다이 헤드에서 재료를 가열하는 데 필요한 시간보다 긴 시간, 또는 다이 헤드에서 결함이 있는 영역을 나타냅니다. 모든 것이 정상인 상태에서 산화 유도 시간이 연속적인 배치에서 아래쪽으로 변동하면 올바른 대응은 다이 헤드 제거 및 검사이며, 수리품 공급업체를 변경하는 것이 아닙니다.
80도 섭씨 온도에서 1000시간 동안의 수압 시험은 가공 품질에 대한 궁극적인 판정입니다. 연성이 깨지기 전에 파이프가 실패하면 벽 두께 또는 재료 등급 문제가 있습니다. 파이프가 연성이 깨지지 않고, 보이지 않는 변형 없이 날카로운 슬릿으로 파열되면 벽 안의 결함 군이 있음을 나타냅니다: 충전제 응집, 오염, 데드 존에서 손상된 재료, 또는 완전히 치유되지 않은 용접 선. 연성 파열은 압력 등급 문제가 아니라 다이 헤드와 재료 취급 문제이며, 해결책은 상류에서 찾을 수 있습니다.
표본 추출 정책이 검사만큼이나 중요합니다. 화재 관 생산 라인에서의 실질적인 검사 절차는 전구간에서 매 시간 기하학적 치수 검사, 생산 하프당 또는 8시간 당 하나씩의 압력 시험 샘플, 산화 유도 시간 및 융통률 측정 등을 수행해야 합니다. 모든 검사 결과는 피펫에 인쇄된 하프 코드와 함께 기록되어 프로젝트 엔지니어가 특정 길이를 특정 하프, 용융 머신 디 헤드 및 재료 량으로 추적할 수 있습니다.
공통된 결함, 근본 원인 및 시정 조치
대부분의 화재 파이프 생산 문제는 반복적으로 나타나는 작은 패턴으로 구성되며, 거의 모든 문제는 실험실 결과가 도착하기 전에 파이프 자체에서 진단할 수 있습니다. 아래 표는 보이는 또는 측정 가능한 증상, 그 다음으로 가능한 근본 원인, 그리고 문제를 해결하는 정비 조치 순으로 구성되어 있습니다.
| 결함 | 근본 원인 | 시정 조치 |
|---|---|---|
| 비대칭 벽 두께, 한 쪽이 두꺼운 경우 | 립이 중앙에 있지 않고, 주조 영역 온도가 불균일하며, 큰 사이즈의 주재가 기울어짐 | 라이브 게이지 값을 사용하여 립 볼트를 재중심화하고, 얇은 면 반대쪽 주조 영역을 3~5°C 정도 비스듬히 위치시킴; 주재 지지를 확인합니다 |
| 벽 두께가 길이에 따라 주기적으로 변합니다. | 운반 속도 검사, 캐리어 트랙 미끄러짐, 공급물 급증, 용융 압력 진동 | Retune the haul-off servo loop; raise clamping pressure in 0.05 MPa steps; verify loss-in-weight feeder stability; inspect the screen pack |
| 내벽에 보이는 용접 선 | 거미 죽기 다리, 용융 온도나 압력이 부족하여 재용접이 되지 않음, 다리의 하류 부분에서 죽은 영역 | 다이 온도를 5℃ 높이고, 역압을 증가시키고, 바스켓 또는 나선형 맨드렐 다이 헤드를 업그레이드한다 |
| Internal voids and shrinkage cavities in a thick wall | 코어가 아직 용융 상태일 때, 껍질이 굳었다 | Raise first tank water to 18 to 20 degrees Celsius; extend the cooling train; reduce line speed; lengthen the calibration sleeve |
| Longitudinal cracking during storage | High residual hoop stress from shock cooling; excessive draw-down ratio | Introduce a stepped temperature gradient across tanks; bring DDR back to 1.05 to 1.12; verify with a slit ring test each shift |
| Ovality above tolerance, flattened crown | Insufficient vacuum in later stages, self-weight sag on large sizes, inadequate roller support | Raise stage 2 and 3 vacuum toward minus 0.08 MPa; add support rollers in the cooling tanks; check sleeve bore wear |
| Ovality at the pipe end only | Cutting while the wall is still warm; cutter clamp pressure too high | 냉각 부분을 절단기 전에 확장하고, 클램프 압력을 줄이며, 더 넓은 클램프 슈어를 사용합니다 |
| Shark skin and rough outer surface | 다이 립 온도가 너무 낮고, 립에서 과도한 전단 속도가 있으며, 다이 립 표면이 오염된 경우 | Raise die lip to 210 to 215 degrees Celsius; open the die gap and reduce draw; polish and clean the lip land |
| Bubbles and steam voids in the wall | Moisture in the compound; condensation on cold pellets; wet regrind | Dry 2 to 3 hours at 80 to 90 degrees Celsius; keep material in a conditioned area; add a vented barrel if regrind is routine |
| Black specks and burn streaks | Degraded material from a die head dead zone; overheated barrel zone; contamination in the feed path | 다이 헤드를 청소하고, 열전대 정확도를 확인하고, 마그네틱 분리기와 공급 시스템을 정화합니다 |
| 빨간 파이프에 색상 줄무늬 | Poor masterbatch dispersion; inadequate distributive mixing; incompatible pigment carrier | Add or upgrade the mixing element in the metering section; raise back pressure; confirm carrier compatibility with the pipe grade |
| Stripe delamination during butt fusion | Stripe melt too cold at the adapter; stripe material incompatible; stripe laid on rather than embedded | Raise the stripe extruder and adapter temperature; use the same base resin family; deepen the stripe channel in the die |
| 유압 부식으로 인한 균열 파열 | Filler or pigment agglomerates; contamination; degraded material inclusions; unhealed weld line | Check dispersion by microscopy; clean the die head; install a finer screen pack; review compound handling and drying |
| 산화 유도 시간 below limit | 융해 온도 too high; residence time too long at low output; antioxidant consumed by reprocessing | Reduce melt temperature 5 to 8 degrees Celsius; run the extruder nearer its design output; limit regrind fraction |
| Longitudinal reversion above 3 percent | Excessive draw-down; excessive axial orientation; insufficient relaxation before cooling | Reduce DDR; increase the die gap; lengthen the air gap slightly to allow melt relaxation |
| Pipe bowing or banana curvature | Asymmetric cooling between top and bottom; uneven spray coverage; misaligned tank axis | Clear blocked spray nozzles; balance top and bottom water flow; laser align the tank train to the die axis |
| Chips inside the pipe after cutting | Worn planetary knife; wrong cutting speed; missing chip extraction | Replace or regrind the knife; adjust the planetary feed rate; fit internal vacuum chip extraction |
| Output drops while screw speed stays constant | Screw or barrel wear; blocked grooved bushing cooling; blinded screen pack | Measure screw flight clearance; descale the bushing cooling circuit; change the screens and log the pressure trend |
A discipline worth adopting: log every corrective action against the batch code and the process recipe rather than fixing problems from memory. Fire pipe production runs the same recipes repeatedly for years, and a defect log tied to recipes turns troubleshooting from an art into a lookup. The Faygo control system supports recipe management with parameter storage and production data export precisely so that this history is preserved across shifts and operators.
응용 산업 및 프로젝트 시나리오
HDPE fire pipe produced on a Faygo extrusion line serves construction, municipal engineering and industrial park infrastructure — three of the core industry solutions the factory has supported across 22 years of pipe and profile equipment supply. The scenarios below describe how the product is specified and used in practice, because a pipe manufacturer who understands the installed application sells more effectively to contractors than one who only quotes diameters.
상업용 단지 내 스프링클러 공급 헤더
A shopping complex or mixed-use development typically has a fire water tank, one or more fire pump sets, and a distribution network feeding sprinkler risers throughout the retail floors. The buried section between the pump room and the base of each riser is the classic HDPE application. Diameters run from 160 to 315 millimeters depending on the sprinkler hazard classification and the number of heads served, and SDR11 at PN16 is the standard specification because pump discharge pressure plus surge routinely exceeds 1.0 MPa. The pipe is butt fused into continuous lengths, laid in a trench beneath the basement slab or the service yard, and transitions to steel at the riser base through a flanged stub end. The commercial appeal is joint integrity: a fused polyethylene network under a slab has no mechanical joints that can weep after the building is occupied.
Underground fire ring mains for basement car parks
Large basement car parks carry a high fire load from vehicles and require hydrant coverage throughout. The ring main that feeds those hydrants is often buried in the perimeter drive or cast into the structural slab, and the loop configuration means water can reach any hydrant from two directions. Diameters of 200 to 355 millimeters at PN16 are typical. Where the main is cast into or beneath a slab, concrete encasement provides the fire separation and mechanical protection route described earlier. Producers serving this segment benefit from long stick lengths and precise end squareness, since fusion joints in a confined basement environment are slow and every avoidable joint is worth money on site.
High-rise hydrant and standpipe water supply
In a high-rise tower the vertical standpipe is metallic, but the horizontal supply that feeds it from the fire water tank and pump room is frequently polyethylene where the routing is buried or within a protected service corridor. Static head in a tall building adds directly to the pressure the supply main must sustain, which pushes the specification toward SDR11 and sometimes SDR9 at PN20 for the lower portions of the system. This is the diameter and pressure combination where wall thickness control matters most: a 250 millimeter SDR9 pipe carries a 27.9 millimeter wall, and a thin spot of even one millimeter meaningfully reduces the safety margin under a surge event.
Industrial park and logistics estate fire networks
산업 단지, 물류 창고 및 제조 공장에는 액세스 도로에 분포된 하이드런트가 있는 대형 직경의 현장용 소화망이 필요하다. 루트가 길고, 직경이 400~575mm에 이르며, 매설 조건이 종종 좋지 않다. 수입 채우기, 잔해, 그리고 중량 차량의 하중이 트렌치 라인에 미치는 영향이다. 이러한 조건은 PE100-RC의 느린 균열 성장 저항으로 인해 설치 시 완전한 모래 주변을 사용하지 않고도 가능하며, 대규모 톤당 수요가 있는 곳이다. 단일 물류 단지에서 500mm PN10을 지속적으로 공급할 수 있는 제조업체는 이러한 수요를 충족할 수 있는 소형 직경의 라인을 제공하지 못한다.
Municipal buried fire mains and hydrant branch lines
Municipal fire service mains along streets, in residential districts and around public facilities use the same product family, generally at 110 to 250 millimeters for hydrant branches and 315 to 500 millimeters for distribution mains. The buyer here is a utility or a municipal engineering contractor, and the purchasing criteria weight standards compliance, batch traceability and delivery reliability heavily. Producers competing in this segment need documented type testing and a marking system that survives handling, both of which are equipment questions before they are paperwork questions.
Adjacent products from the same workshop
Fire pipe rarely fills a factory on its own. Producers who install a Faygo fire pipe line commonly run adjacent products on the same or a companion line: PE water supply and drainage pipe in the same diameter range, PE-RT and PP-R building services piping from 16 to 160 millimeters for heating and hot water risers, single wall corrugated conduit from 6 to 200 millimeters for cable and pipe protection, PE drip irrigation and sprinkler pipe for landscaped areas of the same developments, and PVC and PE cable protection pipe for the electrical infrastructure. Because Faygo covers construction, municipal engineering, agricultural irrigation, communication and power, and wood-plastic composite product lines across three specialized factories, a producer can expand into these adjacent segments with matched equipment rather than a second supplier relationship.
Services, Support and Factory Capability
Buying an extrusion line is buying a decade of production, so the supplier’s engineering and service capability matters as much as the machine specification. Faygo, Wanplas 공장, operates three specialized factories with FAYGOPLAST covering 26,650 square meters in Zhangjiagang, two hours from Shanghai airport, and holds 13 national patents including 8 invention patents. All products are CE and ISO certified and built with internationally recognized brand electrical components. The service package around a fire pipe line covers the full project lifecycle.
Pre-shipment testing.모든 라인은 공장에서 완전히 조립되고 실행된 후 고객의 목표 크기와 압력 등급에 맞게 실제 파이프를 생산한다. 소화 파이프 라인은 72시간 연속 작동 테스트를 거치며, 벽 두께, 타원성 및 표면 품질을 주문 사양에 맞게 검증한다. 고객은 시험 가동에 참여할 수 있으며, 공장 개방 정책이 모든 Wanplas 공장에 적용된다. 또한 고객이 직접 화합물을 제공하여 라인이 실제로 사용될 재료로 테스트할 수 있다.
Sample production and trial runs. Before an order is confirmed, prospective customers can send their PE100 compound for a sample trial. This resolves the questions that specifications cannot: how a particular compound behaves at the target draw-down ratio, what cooling length the wall thickness genuinely requires, and what output the line will hold at the customer’s quality tolerance rather than at a catalog maximum.
설치 및 시운전 Engineers travel to site for mechanical installation, utility connection, alignment of the tank train to the die axis, and process commissioning through to first saleable pipe. Alignment in particular is not a task to leave to a general contractor; a tank train misaligned by a few millimeters over 40 meters produces persistent bowing that no process parameter can correct.
공장 컨설팅. For customers building a new pipe plant, Faygo provides water and electricity design, 3D workshop layout, worker configuration planning, and turnkey new factory construction support. For existing producers, the old machine replacement service is structured for zero downtime by phasing the changeover, and the capacity expansion service targets bottleneck removal — which on fire pipe production is almost always cooling capacity rather than extruder size.
작업자 교육교육은 시동 및 정지 순서, 다이 교체, 레시피 관리, 벽 두께 게이지 교정, 일상적인 유지보수 일정, 그리고 위 표에서 설명된 결함 진단 로직에 관한 내용이다. 훈련을 받은 운영자는 용융 압력 추적을 읽고 이에 따라 조치를 취함으로써 더 많은 불량품을 방지할 수 있다.
예비 부품 및 보증 Under the Wanplas group service promise, every line carries USD 500 in free spare parts each year, plus free replacement of parts damaged within the warranty period. Wear items on a fire pipe line — screen packs, calibration sleeves for each size, cutter knives, haul-off track pads, thermocouples and heater bands — should be stocked locally, and Faygo supplies a recommended two-year consumable list with the machine documentation.
원격 및 지속적인 지원 24/7 online technical support is available, and the PLC control system supports remote diagnostics so that engineers can review process data, alarm history and parameter settings without waiting for a site visit. The Wanplas group promises also cover transportation guarantee, production capacity guarantee, and a quality standard guarantee with refund plus 10 percent compensation if the delivered equipment fails to meet the agreed quality standard.
| Project Phase | What Faygo Provides | What the Customer Provides |
|---|---|---|
| 사양 | 구성 proposal, output calculation, utility load schedule, layout drawing | Target diameters, pressure classes, daily tonnage, delivery format, compound data |
| Validation | Sample trial run on customer compound, dimensional report, factory visit | Compound sample, quality acceptance criteria |
| Manufacturing | CE 및 ISO 표준에 맞게 제작하고, 전기 부품을 브랜드화하며, 진행 보고서를 작성합니다. | 전압과 주파수, HMI 및 문서에 대한 언어 |
| Pre-shipment | 72시간 연속 작동 test, witnessed trial production, packing for export | Optional attendance, shipping instructions |
| Installation | On-site engineers, mechanical and electrical installation, tank train alignment | Prepared floor, power supply, chilled water, compressed air, lifting equipment |
| Commissioning | Process recipe development, gauge calibration, first saleable pipe, quality sign-off | Production compound, operating crew for hands-on training |
| Production | 24/7 online support, remote diagnostics, USD 500 free parts per year, warranty replacement | Maintenance schedule compliance, consumable stock, process data sharing when troubleshooting |
| Expansion | Bottleneck analysis, cooling train extension, additional die sets, second line integration | Updated output targets and product mix |
자주 묻는 질문
Is HDPE pipe allowed for fire fighting pipeline?
Yes, within a defined scope. Polyethylene pipe is widely used for buried private fire service mains, underground hydrant loops and pump suction and discharge lines under standards including NFPA 24, UL 1285 and FM 1613. It is not a substitute for metallic standpipes or for listed sprinkler branch piping in exposed indoor locations, because unmodified polyethylene is combustible and softens near 125 to 135 degrees Celsius. The practical rule is that HDPE fire pipe belongs underground or inside concrete encasement, sleeving or fire wrapping, and transitions to metallic pipe at the point where it becomes exposed.
상업용 건물 화재 메인에서 사용해야 하는 SDR 및 압력 등급은 무엇입니까?
SDR11 at PN16 is the workhorse specification for pumped fire mains, hydrant loops and sprinkler supply headers, because a fire pump commonly develops 0.8 to 1.2 MPa at the discharge flange and the surge allowance pushes the requirement above the 1.0 MPa that SDR17 provides. SDR17 at PN10 is appropriate for large-diameter buried loops with genuinely modest operating pressure, where the material saving on a 400 or 450 millimeter pipe is significant. SDR9 at PN20 appears in high-rise supply mains where static head adds to pump pressure. Always confirm the class against the system design pressure including surge, not against diameter.
How is wall thickness derived from SDR, and how tightly must the line hold it?
벽 두께는 외부 직경과 표준 치수 비율, 즉 e = D/SDR을 곱하여 계산됩니다. 250 밀리미터의 SDR11 파이프는 22.7 밀리미터의 명목 두께를 필요로 하며, 400 밀리미터의 SDR11 파이프는 36.3 밀리미터를 필요로 합니다. 표준은 이러한 값을 양수만으로 최소값으로 취급하므로, 원주면의 어느 부분도 명목값보다 작아서는 안 됩니다. 생산 관행은 평균값을 3~6% 이상으로 목표하며, 원주면의 편차를 최소화하기 위해 압력 파이프 라인에 닫힌 루프 초음파 측정이 표준으로 적용됩니다. 이는 규정 준수를 보호하고 동시에 재료 과중을 줄이는 데 도움이 됩니다.
화재 방지 충전제가 HDPE 파이프의 압력 등급을 낮추나요?
Yes, substantially. Mineral hydroxide loadings of 45 to 60 percent are required to reach a limiting oxygen index of 28 to 32 percent, and at those levels melt flow rate drops sharply, elongation at break can fall below the 350 percent minimum for pressure pipe, notched impact strength is reduced by more than half, and the compound can no longer be classified as PE100 with an MRS of 10.0 MPa. The correct engineering answer is to keep the pressure-bearing fire main as unfilled PE100 protected by burial or encasement, and to use flame retardant compound only for non-pressure casing, sleeving and duct.
315~575 밀리미터의 화재 파이프를 위한 엑스트루더와 냉각 길이는 얼마입니까?
120 밀리미터의 33 L/D 장벽 나사 압출기가 800~1200 kg/h를 제공하는 것이 적절한 주 기계이며, 바스켓 또는 나선형 맨드렐 다이 헤드, 9 미터의 3단 진공 교정 탱크 및 15~18 미터의 냉각 기구가 함께 제공됩니다. 운반은 8 트랙 캐터필러로 60 kN의 당겨지는 힘이 있어야 합니다. 냉각 기구, 즉 압출기가 두꺼운 벽 파이프의 가동 속도를 결정하므로 탱크 길이를 과소 평가하는 것이 전체 구성에서 가장 비싼 경제가 됩니다.
Why does thick-wall pipe crack longitudinally days after production?
과도한 냉각으로 인한 잔류 내부 응력. 차가운 물이 단단한 외부 껍질을 얼리면서 코어가 여전히 녹아 있는 상태일 때, 코어는 그 제약을 받으며 수축 압력을 벽에 가둡니다. 며칠 후, 그 압력은 벽의 수직으로 갈라짐으로 해소되거나 현장에서 부트 융합 시 벽 분리로 나타납니다. 해결책은 벽 두께에 해당하는 단계별 냉각 기울기를 18~20°C에서 시작하고 약 2°C 씩 감소시키는 것, 그리고 벽 두께에 해당하는 냉각 트레인을 갖는 것입니다. 하루에 한 번 슬릿 링 검사를 수행하면 문제를 조기에 발견할 수 있습니다.
80°C의 수압 시험에서 왜 깨지기 쉬운 결함이 발생합니까?
Brittle failure — a sharp slit with no visible deformation — indicates a defect population inside the wall rather than a wall thickness shortfall. The usual sources are pigment or filler agglomerates acting as stress concentrators, degraded material released from a dead zone in the die head, foreign contamination that passed the screen pack, or a weld line from a spider die that never fully healed. Investigation should start with a microtome dispersion check and a die head strip, not with the resin supplier.
한 라인에서 화재 파이프와 일반 수도 또는 건물용 파이프를 모두 생산할 수 있습니까?
Yes, with the right package. A 구성 A line covering 63 to 250 millimeters produces PE water supply and drainage pipe on the same platform simply by changing the color masterbatch and the die set. Adding PP-R and PE-RT capability for 16 to 160 millimeter building services piping requires an interchangeable screw suited to those materials plus the corresponding die and calibration tooling, which Faygo can supply as part of the original order. Running filled flame retardant compound on the same machine is possible but is better handled on a dedicated line, because the wear characteristics and screw geometry requirements are different.
시운전에는 얼마나 걸리며, 어떤 지원이 포함됩니까?
Site installation and commissioning of a complete fire pipe line is an engineer-supervised process covering mechanical assembly, utility connection, tank train alignment, process recipe development, gauge calibration and operator training through to first saleable pipe. Because the line is fully assembled and given 72시간 연속 작동 testing before shipment, the on-site phase concentrates on integration rather than debugging. Ongoing support includes 24/7 online technical assistance, remote PLC diagnostics, USD 500 in free spare parts each year and warranty replacement of damaged parts.
라인 구성을 요청하기 전에 무엇을 준비해야 합니까?
Five items make a proposal accurate: the diameter range and pressure classes you must supply, the daily or annual tonnage target, the delivery format your customers expect — coils, six meter sticks or twelve meter sticks — the compound grade and supplier data sheet you intend to run, and your available workshop length, power supply and chilled water capacity. With those five inputs a complete line configuration, utility schedule and layout drawing can be prepared, and a sample trial can be arranged on your own material before you commit.
결론
High pressure fire resistant HDPE fire pipe extrusion equipment for commercial building fire fighting pipeline is a pressure pipe production system with a specific set of non-negotiable capabilities: a barrier screw single-screw extruder at 33 L/D with a grooved feed bushing, a die head that distributes melt without leaving weakening weld lines, multi-stage vacuum calibration from minus 0.02 to minus 0.08 MPa, a cooling train long enough and gently graded enough to remove heat from a 40 millimeter wall without locking in stress, a servo caterpillar haul-off with adequate pulling force, and closed-loop ultrasonic wall thickness control that protects both compliance and material cost. Around that equipment sits an equally specific body of process knowledge — the SDR to PN ladder built on an MRS of 10.0 MPa and a design coefficient of 1.25, a draw-down ratio held between 1.05 and 1.15, melt temperature controlled to 200~215도, and a test program that runs from hourly geometry checks to 1000-hour hydrostatic type testing.
The fire resistance question resolves cleanly once the routes are understood. Burial, concrete encasement and protective sleeving carry the fire protection function for the pressure-bearing main, which remains unfilled PE100 or PE100-RC with red identification. Halogen-free flame retardant compounding at 45 to 60 percent mineral hydroxide loading delivers a limiting oxygen index of 28 to 32 percent but sacrifices the hydrostatic strength classification, so it belongs in non-pressure casing, sleeving and duct rather than in a rated fire main. A producer who explains this distinction clearly wins credibility with fire protection engineers and avoids the specification disputes that damage a supplier relationship.
Faygo, Wanplas 공장 with 22 years of dedicated pipe and profile extrusion experience, three specialized factories, 26,650 square meters of production space in Zhangjiagang, 13 national patents including 8 invention patents, and CE and ISO certified equipment, configures these lines across the full commercial range — a 75 millimeter platform for 20 to 160 millimeter branch pipe, 구성 A on a 90 millimeter extruder for 63 to 250 millimeters at up to 700 kg/h, and 구성 B on a 120 millimeter extruder for 160 to 575 millimeters at up to 1200 kg/h. Every line receives 72시간 연속 작동 testing before shipment and arrives with installation, commissioning, operator training, 24/7 online support, remote diagnostics and the Wanplas group promise of USD 500 in free spare parts each year.
If you are planning a fire pipe production facility, adding a pressure pipe line to an existing water pipe workshop, or replacing equipment that can no longer hold PN16 quality at the diameters your market now demands, the next step is a conversation about specifics. Share your target diameter range, pressure classes, daily tonnage and preferred delivery format, and our engineering team will prepare a complete line configuration with an output calculation, a utility load schedule and a workshop layout drawing. You are welcome to send your own PE100 compound for a sample trial run, to visit the factory and inspect a line under 72-hour test, and to watch your own material extruded to your own tolerances before making any commitment.
