Why Anti-Corrosion PE Pipe Defines the Ground Source Heat Pump Loop
Anti-corrosion PE ground source heat pump pipe is the buried heat exchanger of every geothermal central heating system, and the quality of that pipe decides whether the loop still performs in year forty or fails in year five. Once a vertical borehole is grouted or a horizontal trench is backfilled, the pipe becomes unreachable. There is no inspection hatch, no valve to isolate a leaking segment, and no economical way to replace a buried U-bend without redrilling. That single fact is why geothermal contractors specify polyethylene rather than steel or copper, and why the extrusion equipment that produces the pipe has to hold wall thickness, ovality, and melt quality to a much tighter standard than general-purpose water pipe.
Ground source heat pump projects have grown from scattered residential installations into district-scale geothermal central heating pipeline engineering, serving apartment blocks, schools, hospitals, office parks, and industrial campuses. A single district loop field can consume tens of kilometers of PE pipe in diameters from 16 mm capillary circuits up to 160 mm and larger header mains. Pipe producers who want to serve that demand need an extrusion line that runs PE100 and PE-RT compounds cleanly, coils small diameters without kinking, and delivers consistent dimensions shift after shift.
Faygo, a Wanplas factory, has spent 22 years building plastic pipe and profile extrusion lines and operates three specialized factories dedicated to this category. The FAYGOPLAST plant in Zhangjiagang covers 26,650 square meters and sits roughly two hours from Shanghai Airport, and the factory holds 13 national patents, 8 of them invention patents. Faygo pipe extrusion equipment covers a diameter range of 12 mm to 575 mm across PE, PP, and PVC, and every line is CE and ISO certified and runs a 72-hour continuous operation test before it is released for shipment. For a geothermal pipe producer, that combination of range and pre-delivery proof is what turns a machine purchase into a working production asset.
This article works through the whole picture: how a ground source heat pump loop uses PE pipe, why polyethylene resists corrosion in aggressive soils, how PE100, PE80, and PE-RT differ for geothermal service, what each section of a PE パイプ押出ライン does, which Faygo line configurations match which pipe programs, how to set and control process parameters, how loops are joined and pressure tested, how PE compares with metal alternatives, and how to select the right line for a specific production plan. 仕様書 tables, a requirement-to-model selection table, a relative investment table, and a frequently asked questions section are included so the article can be used as a working reference rather than a one-time read.
目次
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- なぜ耐腐食性のPEパイプが地中熱源ヒートポンプループを定義するのか
- 地中熱源ヒートポンプループはどのように機能し、パイプはどこに配置されているか
- Why polyethylene resists corrosion underground
- PE100, PE80, PE-RT and PEX for geothermal loops
- Anatomy of a PE ground source heat pump パイプ押出ライン
- Faygo PE パイプ押出ライン: specifications and configurations
- Process parameters and dimensional quality control
- Faygo PE-RT and PP-R パイプ押出ライン for small-diameter circuits
- Joining methods, loop assembly, and pressure testing
- Thermal performance and loop field design
- PE ground loop pipe compared with metal and composite options
- Selection guide: matching your pipe program to a Faygo line
- Application industries and geothermal project types
- Standards, testing, and certification for geothermal PE pipe
- Investment structure and relative cost planning
- Service, support, and turnkey delivery from Faygo
- Frequently asked questions
- Talk to Faygo about your geothermal pipe line
How a Ground Source Heat Pump Loop Works and Where the Pipe Sits
A ground source heat pump moves heat between a building and the earth using a closed circuit of buried pipe filled with water or an antifreeze solution. In winter the ground is warmer than the outdoor air, so the circulating fluid absorbs low-grade heat from the soil or rock and carries it to the heat pump, which raises the temperature and delivers it to radiators, fan coils, or floor heating circuits. In summer the direction reverses and the same buried loop rejects heat from the building into the ground. Because the earth below a few meters holds a nearly constant temperature year round, the heat pump works against a far smaller temperature difference than an air source machine, which is the entire reason geothermal central heating achieves high seasonal efficiency in cold climates.
The buried pipe network is called the ground loop, ground heat exchanger, or ground array, and it takes one of four common forms. Each form places different demands on the pipe and therefore on the extrusion equipment that produced it.
Vertical borehole loops. Boreholes are drilled from roughly 60 to 200 meters deep, and a U-bend assembly made from two pipe legs joined by a factory-molded elbow is lowered into each hole. The annulus is then filled with thermally enhanced grout. Vertical fields are the dominant choice for geothermal central heating pipeline engineering in cities because they need very little surface area. Typical U-bend legs use 25 mm, 32 mm, or 40 mm PE100 pipe, and the pipe must be supplied in continuous coils long enough to reach the bottom of the hole and back without a joint. A buried fusion joint inside a grouted borehole is a risk no designer accepts, so coil length and coil quality are hard requirements.
Horizontal trench loops. Where land is available, pipe is laid in trenches 1.2 to 2.5 meters deep, either as straight parallel runs or as overlapping slinky coils. Horizontal arrays typically use 25 mm to 40 mm pipe and consume more total length than a vertical field for the same capacity, but drilling cost disappears. The pipe sees more thermal cycling here because shallow soil temperature swings with the seasons, so resistance to slow crack growth matters.
Pond and lake loops. Coiled pipe bundles are sunk into a body of water and anchored below the freeze line. Water contact is continuous, so long-term hydrolytic stability and resistance to biological fouling are the governing properties.
Header and distribution mains. Individual boreholes or trenches connect through horizontal runouts to a header manifold, then to a supply and return main that enters the mechanical room. Headers and mains carry the combined flow and step up in diameter, commonly 63 mm, 90 mm, 110 mm, 125 mm, or 160 mm for a district-scale field. These sizes are produced in straight lengths on a line equipped with a cutter and tilting table rather than a coiler.
A complete geothermal central heating project therefore needs a pipe supply that spans coiled small diameters and straight large diameters. Producers who serve this market usually run one line configured for 16 mm to 63 mm with a dual coiler and a second line configured for 63 mm to 160 mm with a planetary cutter, which is exactly how Faygo configures its PE pipe extrusion systems for geothermal customers.
Why Polyethylene Resists Corrosion Underground
Polyethylene resists corrosion because it is chemically inert, non-metallic, and non-conductive, so the electrochemical reactions that destroy buried metal pipe simply cannot start. Steel corrodes when an anode, a cathode, an electrolyte, and a return path exist together; soil moisture provides the electrolyte and the metal provides the rest. PE has no free electrons to donate, does not form a galvanic couple with adjacent metals, does not scale, does not tuberculate, and is not attacked by the sulfates, chlorides, or mildly acidic groundwater that shorten the life of carbon steel and ductile iron in the same trench. For a ground loop that must survive decades of continuous burial, that immunity is the deciding property.
Several distinct mechanisms combine to give a correctly produced PE ground loop its long service life.
土壌pH範囲にわたって化学的に不活性である PE is unaffected by soil pH from strongly acidic to strongly alkaline, and it resists salts, dilute acids, alkalis, and the antifreeze solutions circulated inside the loop. Propylene glycol, ethylene glycol, and methanol-based heat transfer fluids are all compatible with polyethylene at ground loop operating temperatures, which is not true of every polymer.
No galvanic or stray-current corrosion. Because PE is an electrical insulator, a polyethylene ground loop cannot act as an unintended current path near rail lines, cathodic protection systems, or grounding electrodes. Metal loops in the same environment need isolation fittings and monitoring; PE loops need neither.
Resistance to slow crack growth. The failure mode that actually threatens a buried PE pipe is not corrosion but slow crack growth initiated at a scratch, a rock point load, or a poorly fused joint. Modern PE100 resins are engineered with bimodal molecular weight distribution specifically to resist this, and pipe produced with clean melt, correct cooling, and low residual stress carries far more crack resistance margin than pipe extruded with an overheated barrel or an unbalanced cooling tank. Equipment quality is directly connected to long-term crack resistance, which is a point many buyers overlook.
Oxidation and antioxidant protection.PE合成物には、加工およびサービス中のポリマーを保護する抗酸化パッケージが含まれています。過剰な溶融温度、バレル内の長い滞在時間、またはシェアピークは、パイプが設置される前にその抗酸化剤の予備量を消費します。完成したパイプでの酸化誘導時間のテストは、エクストルージョンプロセスが安定剤システムを保持したことを確認する標準的な方法です。正確な温度制御と適切に設計されたねじによって、その予備量が保たれます。
Carbon black and buried UV exposure.地中ループパイプは通常黒色で、約2〜2.5％の微粒状カーボンブラックを添加して、設置前の地上保管中にパイプを保護します。分散品質は、積載量と同じくらい重要であり、不良な分散はパイプ壁に灰色のストライプとして現れます。良好な混合は、均一な色と均一な保護をもたらします。
Abrasion and scaling behavior.ボアが滑らかに保たれ、酸化層が蓄積しないため、PE地中ループの水力粗さは時間が経つにつれ増加しません。スケールが蓄積する金属ループは、ポンプエネルギーが上昇します。PEループはそうではありません。30年間の地区暖房運用において、その安定したポンプ需要は、マーケティング主張ではなく、真の運用上の利点です。
これらの特性の組み合わせが、PE100地中ループパイプが、その指定された圧力クラスと参照温度で50年の設計寿命を有することが一般的に評価される理由であり、地熱設計者が埋められた配列を機械的部品ではなく永続的な公共資産として扱う理由です。
PE100、PE80、PE-RT、PEXは地熱ループ用に使用されます。
The four polymer families used in ground source heat pump loops differ mainly in pressure rating, temperature capability, flexibility, and how they are joined. Choosing among them is a design decision, but it is also a production decision, because each material needs a slightly different screw, temperature profile, and cooling strategy on the extrusion line.
PE100 is the workhorse of geothermal central heating. It is a bimodal high-density polyethylene with a minimum required strength of 10 MPa, giving high pressure capability at a given wall thickness and excellent resistance to slow crack growth. Vertical U-bends, horizontal arrays, headers, and mains are predominantly PE100. It is joined by butt fusion and electrofusion, both of which create a joint as strong as the pipe wall.
PE80 has a minimum required strength of 8 MPa and remains common in smaller diameters and in markets where legacy specifications persist. For the same pressure class it needs a thicker wall than PE100, which raises material consumption but also slightly increases stiffness. PE80 processes at a marginally lower melt temperature and is a little more forgiving on the cooling tank.
PE-RT高温耐性ポリエチレンは、クロスリンクしないように制御されたコモナー分布を使用して、高温下でも圧力を保持します。地熱用に実用的な利点は、小径時の柔軟性と、クロスリンクされた材料とは異なり、熱融着が可能であることです。PE-RTは、16 mmから32 mmの配管回路、ヒートポンプで給湯される床暖房ループ、および地熱集中暖房システムの屋内側に適しています。
PEX, crosslinked polyethylene, offers the highest continuous temperature capability of the four, but crosslinking makes it impossible to butt fuse; it relies on mechanical or compression fittings. That is acceptable indoors and unacceptable inside a grouted borehole, so PEX appears on the building side rather than in the buried array.
The table below summarizes the properties that matter when specifying pipe for a ground source heat pump project. Values are typical published ranges for pipe-grade compounds and will vary by grade and supplier.
| 特性 | PE100 | PE80 | PE-RTタイプII | PEX-a/b |
|---|---|---|---|---|
| Minimum required strength | 10.0 MPa | 8.0 MPa | Rated by temperature class | Rated by temperature class |
| Density | 0.949 to 0.960 g/cm3 | 0.940 to 0.950 g/cm3 | 0.933 to 0.945 g/cm3 | 0.938 to 0.947 g/cm3 |
| 溶融流動率, 190 C / 5 kg | 0.2 to 0.5 g/10 min | 0.4 to 0.9 g/10 min | 0.5 to 1.2 g/10 min | Base resin dependent |
| Thermal conductivity | 0.40 to 0.45 W/m·K | 0.38 to 0.43 W/m·K | 0.38 to 0.42 W/m·K | 0.38 to 0.41 W/m·K |
| Continuous service temperature | Up to 40 C at full rating | Up to 40 C at full rating | Up to 70 C with derating | Up to 95 C with derating |
| Heat fusion joinable | Yes, butt and electrofusion | Yes, butt and electrofusion | Yes, socket and electrofusion | No, mechanical fittings only |
| Flexibility at 25 mm | Medium | Medium to high | High | High |
| Typical geothermal use | Vertical U-bends, headers, mains | Small horizontal loops | Distribution and floor circuits | Indoor building side only |
| Design service life reference | 50 years at rated class | 50 years at rated class | 50 years at class condition | 50 years at class condition |
One practical note on thermal conductivity: polyethylene is a poor conductor compared with metal, and no polymer choice will change that meaningfully. Ground loop heat transfer is governed far more by borehole grout conductivity, soil or rock conductivity, flow regime inside the pipe, and total loop length than by the pipe polymer itself. What the pipe must deliver is dimensional consistency, pressure integrity, and thin, uniform walls at the specified standard dimension ratio, because a thinner uniform wall lowers thermal resistance and a thicker uneven wall raises it. That is a manufacturing outcome, and it is decided by the extrusion line.
Anatomy of a PE Ground Source Heat Pump パイプ押出ライン
A PE ground source heat pump パイプ押出ライン is a continuous process train in which molten polyethylene leaves a die as a tube, is fixed to final diameter under vacuum, is cooled through a controlled temperature gradient, is pulled at constant speed, and is then cut or coiled. Every station influences the finished pipe, and a weakness anywhere shows up as ovality, wall variation, internal stress, or a pipe that fails hydrostatic testing. Understanding the train section by section is the fastest way to evaluate a supplier’s proposal.
Raw material handling and drying. PE pellets arrive with low moisture, but geothermal pipe producers who blend in regrind or who store material in humid conditions still install a hopper dryer or dehumidifying dryer. A vacuum loader feeds the hopper, and a gravimetric or volumetric metering unit doses masterbatch if color is added at the machine rather than bought pre-compounded. Consistent feeding is the first requirement for consistent wall thickness.
シングルスクリューエクストラダー。 Polyethylene pipe is extruded on a grooved-feed 単一スクリュエキストラクター with a barrier screw and a mixing section. Grooved feed bushings raise output and stabilize throughput against pressure fluctuation, which is exactly what a pipe line needs. Typical L/D ratios run from 30:1 to 38:1 for PE, long enough to plasticize fully at moderate melt temperature. The barrel is zoned, usually four to seven heating zones with air or water cooling, and the screw is designed to melt the polymer through conducted and shear heat without creating hot spots that would consume the antioxidant package. Screw diameter is the main sizing variable: a 45 mm screw suits small coiled pipe, 65 mm covers the mid range, and 90 mm or larger serves header and main diameters.
Screen changer and melt pump. A hydraulic screen changer removes contaminants and unmelted particles, and on high-specification lines a melt gear pump smooths pressure pulsation so the die sees a constant flow. For geothermal pipe, where wall uniformity translates directly into thermal and pressure performance, a melt pump is a worthwhile option rather than a luxury.
スパイラル型ダイスヘッド。 The die head converts the melt stream into an annular tube. Modern PE pipe dies use a spiral mandrel design that distributes flow around the circumference and eliminates the weld lines that a simple spider die leaves behind. Weld lines are weak planes and are unacceptable in a pipe that must resist slow crack growth for decades. The die also incorporates a basket or streamlined flow path to minimize residence time. Die and mandrel sets are changed to move between diameters, and a well-planned line uses a common die body with interchangeable tooling to keep changeover time short.
真空校正タンク Immediately after the die the soft tube enters a vacuum calibration tank. A calibration sleeve sized to the outside diameter holds the pipe while vacuum draws the wall against the sleeve and water sprays cool the surface. The vacuum level, typically a fraction of an atmosphere and adjusted by valve, is what fixes outside diameter and roundness. Tank length depends on wall thickness and line speed; small coiled pipe may need a single 3 meter tank while a 160 mm header pipe needs a longer first tank plus additional cooling.
スプレー冷却タンク. After calibration, one or more spray cooling tanks remove the remaining heat. Spray cooling is preferred over full immersion for thick walls because it can be staged: the first tank runs cooler to freeze the outer skin, later tanks run warmer so the inner wall cools gradually. Cooling too fast on the outside while the inside is still molten locks in residual stress, and residual stress is a direct enemy of long-term crack resistance. A chiller supplies the water circuit, and water temperature is a controlled process parameter, not an afterthought.
Haul-off unit.カタプラーのハウルオフは、2、3、4、6、または8トラックで、正確に調整された速度でパイプを引きます。ハウルオフスピードとエクストラダー出力は、壁厚を設定します：ハウルオフが速くなると、壁が薄くなります。ドライブはサーボまたはインバーター制御で、エクストラダーと同期しています。トラック圧力は、スリップを防ぐのに十分に強く、マーキングを防ぐのに十分に優しい必要があります。
Cutting or coiling. This is the branch point that decides how a geothermal line is configured. Straight lengths for headers and mains use a planetary saw or チップレスカッター that travels with the pipe while cutting, followed by a tilting discharge table. Coiled small-diameter pipe for vertical U-bends and horizontal arrays uses a single or dual coiler with automatic length counting and strapping. Because a vertical borehole demands one continuous coil long enough for the full down-and-back run, coiler capacity and coil tension control are critical purchasing criteria for geothermal producers.
Marking, testing, and control. An inkjet or laser printer marks the pipe with size, class, standard, and a meter counter. Online ultrasonic wall thickness measurement is available for producers who need continuous documentation. The whole train runs under a PLC with an HMI touch screen, allowing recipes to be stored per pipe size, parameters to be adjusted in real time, and production data to be logged. Faygo builds its lines with an intelligent control system and internationally recognized brand electrical components, and each line is proven with 72 hours of continuous operation before delivery.
Faygo PE パイプ押出ライン: 仕様書s and Configurations
Faygo builds PE ground source heat pump パイプ押出ラインs as configuration classes rather than fixed catalog boxes, sized around the diameter band and output a customer actually needs. The three classes below cover the great majority of geothermal pipe programs, from a small workshop producing 25 mm and 32 mm U-bend coils to a plant supplying district-scale headers. Faygo’s overall pipe extrusion capability spans 12 mm to 575 mm in PE, PP, and PVC, so a producer who later adds drainage, gas, or irrigation pipe can stay within the same equipment platform.
| パラメータ | Coil line, 16 to 63 mm | Standard line, 20 to 110 mm | Header line, 63 to 160 mm |
|---|---|---|---|
| Pipe outside diameter range | 16 to 63 mm | 20 to 110 mm | 63 to 160 mm |
| Wall thickness range | 1.8 to 6.0 mm | 2.0 to 10.0 mm | 4.0 to 15.0 mm |
| 材料 | PE100, PE80, PE-RT | PE100, PE80, PE-RT, PP | PE100, PE80 |
| Extruder screw diameter | 45 or 50 mm | 65mm | 75 or 90 mm |
| Screw L/D ratio | 33:1 | 33:1 to 36:1 | 36:1 to 38:1 |
| Feed system | Grooved feed, water cooled | Grooved feed, water cooled | Grooved feed, water cooled |
| 最大出力 | 120 to 180 kg/h | 250 to 350 kg/h | 400 to 600 kg/h |
| Typical line speed | 8 to 30 m/min | 3 to 18 m/min | 1 to 8 m/min |
| Die head type | Spiral mandrel, quick change | Spiral mandrel, basket type | Spiral mandrel, basket type |
| Vacuum calibration tank | 1 tank, 3 to 4 m | 1 tank, 6 m | 1 tank, 6 m plus stainless inner |
| スプレー冷却タンク | 1 tank, 4 to 6 m | 1 to 2 tanks, 6 m each | 2 to 3 tanks, 6 m each |
| Haul-off | 2 or 3 track caterpillar | 4 track caterpillar | 4 or 6 track caterpillar |
| Downstream end | Single or dual coiler | Planetary cutter plus coiler option | Planetary saw and tilting table |
| インストール電力 | 75 to 110 kW | 130 to 180 kW | 200 to 280 kW |
| コントロール | PLC and HMI, recipe storage | PLCとHMI、インバーター駆動装置 | PLC and HMI, servo haul-off, data logging |
| Pre-delivery testing | 72-hour continuous run | 72-hour continuous run | 72-hour continuous run |
| Certification | CE, ISO | CE, ISO | CE, ISO |
表のインプットパワーは接続された負荷であり、実稼働時の負荷ではありません。PEパイプラインは通常、処理が安定した時の55％〜70％の接続パワーを消費します、なぜならバレルヒータは一度に処理が平衡を達成すると、エキストラーダモーターが定格トルク以下で動作するからです。プランナーがトランスフォーマーまたは作業場の電気設計に関心がある場合は、ファヨに両方の数値を求めてください。ファヨのコンサルティングサービスには、水と電気デザインと3D作業場レイアウトが含まれており、電話機が到着する前にこれらの数値が確定される必要があります。
Two configuration decisions deserve extra attention for geothermal producers. The first is the coiler. A vertical borehole 150 meters deep needs a U-bend coil longer than 310 meters, and a coiler that cannot hold and tension that length forces the producer to make joints, which the specification forbids. Faygo sizes the coiler around the deepest borehole the customer expects to serve. The second is the number of cooling tanks. Header pipe at 160 mm with a 15 mm wall carries enormous stored heat, and short-changing the cooling section leads to pipe that appears round at the haul-off and goes oval on the storage rack.
Process Parameters and Dimensional Quality Control
Producing geothermal-grade PE pipe is less about running fast and more about running stable. The core discipline is holding melt temperature, vacuum, cooling water temperature, and haul-off speed steady so that outside diameter, wall thickness, and ovality stay inside tolerance for the entire shift. The table below gives working parameter windows for PE100 pipe on a Faygo line. Treat them as starting points to be optimized against the specific resin grade and pipe size.
| パラメータ | 一般的設定 | Effect if too low | Effect if too high |
|---|---|---|---|
| Barrel zone 1 (feed) | 160~175℃ | Unmelted pellets, surging | Early melting, feed slip |
| Barrel middle zones | 180 to 200 C | High motor load, poor mixing | Antioxidant consumption |
| Die head zones | 195 to 215 C | Rough bore, melt fracture | Sagging, thin top wall |
| 溶融温度 at die | 200 to 215 C | Poor weld healing, low gloss | Degradation, low oxidation induction time |
| 溶融圧力 | 18 to 32 MPa | Output surging | Screw and gearbox stress |
| Screw speed | 30 to 85 rpm by size | Output below target | Shear heat, melt temperature rise |
| 校正中の真空 tank | 0.02 to 0.06 MPa negative | Undersize, oval pipe | Sleeve marking, pipe sticking |
| 調整水 temperature | 14 to 20 C | Frozen skin, residual stress | Soft pipe, dimension drift |
| Final cooling water temperature | 18 to 25 C | Stress locked in wall | Pipe still warm at coiler |
| ハウルオフスピード tolerance | Within 0.5 percent of setpoint | Thick wall, material waste | Thin wall, pressure class failure |
| Outside diameter tolerance | Per standard grade B or better | Fusion fit-up problems | Fitting interference |
| Ovality after coiling | Within standard limit for coil | Not applicable | Rejected at fusion, re-rounding needed |
Wall thickness is controlled by the ratio of extruder output to haul-off speed, and the practical technique is to fix the haul-off speed at the value that gives the target meters per hour, then trim screw speed until the measured wall sits just above the minimum. Running with a deliberate positive margin of five to eight percent above minimum wall is normal practice, because the standard permits no point below minimum. Producers with online ultrasonic measurement can shrink that margin and save resin, which over a year of continuous production is one of the largest cost reductions available to a pipe plant.
Ovality deserves separate discussion for geothermal work because so much of the pipe ships in coils. A coiled pipe naturally flattens slightly at the bend, and standards allow more ovality for coiled pipe than for straight lengths. Even so, a badly oval pipe cannot be aligned in a butt fusion machine or seated in an electrofusion coupler without a re-rounding clamp. The way to keep coil ovality low is to cool the pipe fully before it reaches the coiler, keep coil diameter generous relative to pipe diameter, and control coiling tension so the pipe is laid rather than dragged.
Three further quality checks belong in any geothermal pipe plant routine. 溶融流動率 testing on incoming resin and on finished pipe confirms that processing did not degrade the polymer, with a change of more than about 20 percent flagged for investigation. 酸化誘導時間を測定すること testing confirms that the antioxidant package survived. Hydrostatic pressure testing at the temperatures and stress levels required by the applicable pipe standard confirms long-term integrity. A producer who runs these three tests consistently can defend a 50-year service claim; a producer who runs none of them cannot.
Faygo PE-RT and PP-R パイプ押出ライン for Small-Diameter Circuits
Geothermal central heating does not stop at the borehole. Once the ground loop delivers heat to the heat pump, the building side needs its own pipe network, and that network is dominated by PE-RT and PP-R in diameters from 16 mm to 32 mm for floor heating circuits and 20 mm to 160 mm for risers and distribution. Producers who already supply ground loop pipe frequently add this second line because it sells into the same project and often to the same customer. Faygo’s PP-R and PE-RT パイプ押出ライン covers PP-R and PE pipe from 16 mm to 160 mm and PE-RT pipe from 16 mm to 32 mm, which maps precisely onto the indoor side of a ground source heat pump installation.
Technically the line resembles the ground loop line but differs in three ways. PE-RT and PP-R run at different melt temperatures and need screw geometries matched to their rheology, PP-R in particular requiring gentler shear and a longer cooling section because of its slower crystallization. Small-diameter circuits run at much higher line speeds, so the coiler and length counter work harder than the extruder. And oxygen barrier construction is common on the building side, which means the line may be extended with a co-extrusion head and adhesive layer stations to apply an ethylene vinyl alcohol barrier that keeps dissolved oxygen out of the heat pump circuit and protects steel components from corrosion.
| パラメータ | PE-RT floor circuit line | PP-R and PE-RT general line | Barrier co-extrusion line |
|---|---|---|---|
| Pipe outside diameter | 16 to 32 mm | 16～110 mm | 16 to 32 mm |
| 材料 | PE-RT Type I and II | PP-R, PE-RT, PE | PE-RT with barrier layer |
| Wall thickness | 1.8 to 3.0 mm | 2.0 to 12.5 mm | 2.0 to 3.0 mm plus barrier |
| Main extruder screw | 45 mm, L/D 30:1 | 65 mm, L/D 33:1 | 45 mm, L/D 30:1 |
| Co-extruder | Optional 20 mm stripe unit | Optional 25 mm stripe unit | Two units, 20 and 25 mm |
| Output | 80 to 130 kg/h | 200 to 320 kg/h | 70 to 110 kg/h |
| ライン速度 | 15～40 m/min | 2 to 20 m/min | 12 to 30 m/min |
| 溶融温度 window | 195 to 215 C | 200 to 230 C by material | 195 to 215 C main layer |
| Calibration and cooling | Vacuum tank 4 m plus spray 4 m | Vacuum tank 6 m plus spray 6 m | Vacuum tank 4 m plus spray 6 m |
| Haul-off | 2 track, servo | 4 track, servo | 2 track, servo |
| Downstream | Dual coiler, auto changeover | Cutter plus coiler option | Dual coiler with tension control |
| インストール電力 | 60 to 85 kW | 120 to 165 kW | 75 to 100 kW |
| Control and testing | PLC and HMI, 72-hour test | PLC and HMI, 72-hour test | PLC and HMI, 72-hour test |
| Certification | CE, ISO | CE, ISO | CE, ISO |
Faygo’s broader pipe and profile portfolio gives geothermal producers useful adjacent options. The PE, PP, and PVC single wall corrugated パイプ押出ライン covers 6 mm to 200 mm and produces the flexible conduit used to sleeve and protect ground loop runouts where they pass under slabs or through building entries. The PVC pipe production line handles UPVC pipe in large diameters and varied wall thickness for drainage and site works, and the PVC double パイプ押出ライン produces two 16 mm to 40 mm pipes simultaneously for conduit and small services. Within the Wanplas group, matched auxiliary and compounding equipment is available so that a pipe plant can source mixing, drying, and material handling systems from the same brand relationship rather than assembling a supply chain from scratch.
Joining Methods, Loop Assembly, and Pressure Testing
A ground loop is only as reliable as its joints, and the joining method is chosen before the pipe is even ordered because it constrains material, wall thickness, and dimensional tolerance. Three heat fusion techniques dominate geothermal work, plus a small role for mechanical fittings above ground.
Butt fusion heats the squared ends of two pipes against a heater plate, removes the plate, and forces the melted faces together under controlled pressure until they cool. Done correctly, the joint is homogeneous and as strong as the pipe. Butt fusion is standard for headers and mains from 63 mm upward and requires pipe with tight outside diameter tolerance and low ovality so the ends align within the clamp. Buried butt fusion joints in a header trench are entirely normal practice.
Socket fusion管の外側と接合部の内側を同時に加熱し、その後それを接合します。これは小径の場合や PP-R と PE-RT の建設用配管の場合によく行われ、迅速ですが、接合部の品質はソケットの深さと作業者の技術によって決まります。そのため、重要な埋設アプリケーションでは電気溶接よりも使用頻度が低いです。
Electrofusion uses a fitting with an embedded resistance wire; a control unit passes current, the wire melts the interface, and the joint solidifies. Electrofusion is preferred for tight trenches, repair work, and any location where a butt fusion machine cannot be aligned. It also produces the most consistently documented joint because modern control units log voltage, current, time, and fitting barcode for every fusion. For district-scale geothermal central heating pipeline engineering, that traceability is often written into the contract.
Factory U-bends. The bottom of a vertical borehole uses a molded U-bend rather than a field joint. These are injection molded or butt fused in the factory under controlled conditions and pressure tested before shipment. Fusing a U-bend in the field, then grouting it 150 meters underground, is a risk no serious installer takes.
Assembly of a vertical field then follows a fixed sequence. The U-bend assembly is pressure tested on the drum before it goes down the hole, lowered with a weight to overcome buoyancy, pressure tested again once at depth, grouted with a thermally enhanced bentonite or cement grout placed from the bottom up through a tremie pipe, and pressure tested a third time after grouting. The horizontal runouts are then fused to the loop legs, the header manifold is assembled, and the complete circuit is flushed, purged of air, filled with the heat transfer fluid, and pressure tested as a system. Purging matters more than most people expect: a single trapped air pocket at a high point can throttle flow in an entire circuit and quietly cut system efficiency for years.
地中ループの試験実践では、通常、作業圧力よりもはるかに高い試験圧力を適用し、一定の期間に温度補正を加えて、ポリエチレンがゆがみ、パイプの拡張によって引き起こされる圧力低下を漏れと勘違いする可能性があるためです。経験豊富なスタッフは、初期の緩和を許可してから定められた時間を保持する2段階のテストを実行します。これらすべては、パイプがその寸法規格を満たしていることが前提です。これは、エクストラダーラインが、あらゆるジョイントをより難しくし、すべてのテストが失敗する可能性があることを意味します。
Thermal Performance and Loop Field Design
地中ループの熱性能は、循環液と無変化な地中との間の抵抗チェーンによって規定され、パイプは単なるリンクです。全体のチェーンを理解すると、壁の均一性が重要であり、エキゾチックなパイプ材料を追求することがほとんど無駄であることがわかります。
The chain runs as follows: convective resistance from the fluid to the pipe bore, conductive resistance through the pipe wall, contact and conductive resistance through the grout or backfill, and finally conductive resistance through the soil or rock to the far field. In a typical grouted vertical borehole the grout and ground dominate, the pipe wall contributes a modest share, and the fluid film contributes a share that the designer directly controls through flow rate.
Flow regime. Turbulent flow inside the pipe collapses the fluid film resistance, so ground loops are designed for turbulent conditions, generally by keeping the flow rate above a threshold that depends on pipe diameter, fluid viscosity, and temperature. Antifreeze raises viscosity and pushes the turbulence threshold higher, which is why glycol loops need slightly more pumping than plain water loops. Oversized pipe reduces pressure drop but risks dropping into laminar flow, which quietly ruins heat transfer. Undersized pipe guarantees turbulence but burns pumping energy. Correct sizing sits between the two.
壁厚と標準寸法比。 A thinner wall gives lower conductive resistance, so designers prefer the highest standard dimension ratio that still satisfies the pressure requirement, commonly SDR 11 or SDR 17 for ground loops depending on borehole depth and system pressure. Deep boreholes create static head that pushes toward SDR 11. This is also where manufacturing quality shows: if a pipe is nominally SDR 11 but the wall varies around the circumference, the thick side adds resistance while the thin side sets the pressure rating, and the producer pays twice.
Grout conductivity. Thermally enhanced grouts substantially outperform plain bentonite, and specifying the grout is usually a higher-leverage decision than any pipe choice. Poorly placed grout that leaves voids is worse still, because air is an excellent insulator.
Loop length. Required loop length per unit of heating or cooling capacity varies widely with ground conductivity, undisturbed ground temperature, borehole spacing, and the annual balance between heat extraction and rejection. Wet, conductive rock needs far less borehole than dry sand. Because a district geothermal field runs for decades, designers also check the long-term thermal balance; a heating-dominated field slowly cools the ground over many years if boreholes are packed too closely, and the fix is wider spacing, more length, or a supplementary heat rejection source.
Pipe surface and fouling. Because polyethylene does not corrode or scale, the bore stays smooth for the life of the loop and design pressure drop remains valid decades later. Systems built with metal loops need a fouling allowance from day one.
PEパイプ生産者にとって、地熱顧客は、寸法の一貫性、圧力クラス、溶融行動、コイル長、および文書化に基づいてパイプを評価します。安定した丸いパイプを長いきれいなコイルでエクストラダーすることができるラインが、再び地区暖房供給契約を勝ち取るものです。
PE Ground Loop Pipe Compared With Metal and Composite Options
Polyethylene became the default ground loop material because every alternative fails on at least one of the four criteria that matter underground: corrosion resistance, joint reliability, installed cost, and service life. The comparison below is between material technologies, evaluated on the criteria a geothermal designer actually weighs.
| Criterion | PE100 polyethylene | Carbon steel | Copper | Multilayer composite |
|---|---|---|---|---|
| Corrosion in soil | Immune | High risk, needs coating and cathodic protection | Pitting risk in acidic or saline soil | Outer layer resistant, joints vulnerable |
| Buried joint reliability | Fused, homogeneous | Welded, coating repair required | Brazed, corrosion-prone | Press or compression, not preferred buried |
| Thermal conductivity of wall | Low, offset by thin wall | High | Very high | Medium |
| Long coil availability | Yes, hundreds of meters | いいえ | Limited | Yes, shorter lengths |
| 設置 labor | Low | Very high | High | Medium |
| Scaling and fouling over time | なし | Significant | Moderate | Low |
| Stray current sensitivity | None, insulator | High | High | Low to medium |
| Relative material cost | Low | Medium | Very High | High |
| Relative installed cost | Low | Very High | プレミアム | High |
| Suitability for grouted borehole | Standard practice | Not used | Rare, direct exchange systems only | Not standard |
The apparent weakness of polyethylene, its low wall conductivity, turns out to matter far less than intuition suggests, because the pipe wall is thin and the borehole and ground resistances dominate the total. Meanwhile the advantages compound: a fused PE loop has no joints that corrode, no coating to damage during backfill, no cathodic protection to monitor, and no scale to reduce flow. That is why the market converged on PE and why the equipment question for a producer is not whether to make PE ground loop pipe but which line configuration to buy.
Selection Guide: Matching Your Pipe Program to a Faygo Line
Choosing an extrusion line starts with the pipe program, not the machine catalog. Define the diameter range you must supply, the deepest borehole your market drills, whether you sell coils or straight lengths, and the annual tonnage you need, and the correct configuration falls out almost automatically. The table below maps common geothermal pipe programs to a Faygo line configuration.
| Your requirement | Loop type served | Diameter and material | おすすめのFaygoライン | Key options to add |
|---|---|---|---|---|
| Start-up plant, U-bend coils only | Vertical borehole loops | 25 to 40 mm PE100 | Coil line, 16 to 63 mm, 45 mm screw | Long-length single coiler, meter counter |
| Mixed coil program with high uptime | Vertical and horizontal arrays | 20 to 63 mm PE100 and PE80 | Coil line, 16 to 63 mm, 50 mm screw | Dual coiler with automatic changeover |
| Contractor supply, coils plus short mains | Loops plus runouts | 20 to 110 mm PE100 | Standard line, 20 to 110 mm, 65 mm screw | Planetary cutter plus coiler branch |
| District heating header supply | Manifolds, supply and return mains | 63 to 160 mm PE100 | Header line, 63 to 160 mm, 75 or 90 mm screw | Extra spray tank, melt pump, tilting table |
| Building-side circuits for heat pumps | Floor heating and distribution | 16 to 32 mm PE-RT | PE-RT floor circuit line | Dual coiler, color stripe co-extruder |
| Oxygen barrier pipe requirement | Closed circuits with steel components | 16 to 32 mm PE-RT with barrier | Barrier co-extrusion line | Adhesive and barrier extruders, tension control |
| Full geothermal package supplier | Ground array plus building side | 16 to 160 mm PE100 and PE-RT | Two lines: coil line plus header line | Shared chiller, central feeding, layout design |
| Protective conduit for runouts | Slab and entry penetrations | 6 to 200 mm PE, PP or PVC | Single wall corrugated パイプ押出ライン | Forming block sets by size |
| Site drainage and civil works pipe | Trench and surface drainage | UPVC large diameter | PVC pipe production line | Belling machine, socket tooling |
Two questions decide most of the remaining detail. First, what is your realistic annual tonnage? A single coil line running two shifts at 150 kg/h produces roughly 1,700 to 1,900 tonnes per year at reasonable utilization, which is enough to supply a substantial regional geothermal market. If your forecast exceeds that, a second line beats pushing one line past its stable window. Second, how often will you change size? Frequent changeover favors quick-change die tooling and stored recipes; a stable single-size program favors optimizing for maximum output on that one size.
適用分野 and Geothermal Project Types
Anti-corrosion PE ground source heat pump pipe reaches the market through several distinct industries, and a producer who understands them can position product and capacity intelligently. Faygo’s pipe extrusion equipment already serves construction, municipal engineering, agricultural irrigation, and communication and power sectors, and geothermal central heating sits at the intersection of the first two.
建設工事 and building services. Residential towers, commercial offices, hotels, schools, and hospitals install ground source heat pump systems to meet energy codes and reduce operating cost. Each project consumes ground loop coils, header pipe, runout pipe, and the building-side PE-RT distribution and floor heating circuits. 建設工事 customers value delivery reliability and documentation as much as price, because a delayed pipe shipment stalls a drilling crew that is charging by the day.
市民および地区エネルギー工学。 Municipal geothermal central heating pipeline engineering is the largest single consumer of loop pipe. A district system serving a residential district or a campus can install hundreds of boreholes and kilometers of header main. These projects are tendered, specification-driven, and traceability-heavy: batch records, test certificates, and material declarations are typically required. Municipal work also pulls in large-diameter distribution pipe, which is why producers eventually add a header line covering 110 mm to 160 mm and beyond.
Geothermal, HVAC, and mechanical contracting.専門的な地熱掘削業者と機械工事業者は、組み立て済みUバンドコイル、ヘッダー、溶接フィッティング、およびマニホールドを購入します。このチャネルは、一貫したコイル長、きれいな印刷、および圧力テストに合格するパイプを提供できる生産者に報いるものです。業者はお互いに話し合い、パイプが最初から圧力テストに合格するという評判は、割引よりも価値があります。
Agriculture and horticulture.温室は気候制御のために地中熱源ヒートポンプを使用し、農業施設には横断型ループフィールドが用意されていることが多いです。同じ生産者は、PEドリップ灌漑および散水パイプも提供し、これらは異なる工具で異なるエクストラダーライン上で動作します。ファイゴの農業灌漑ソリューションとその地中熱源パイプ機能は、機器を共有し、1ラインでシーズンを通して両市場に対応できます。
Industrial and process facilities.データセンター、食品工場、および軽製造現場では、地中熱源をベースロード冷却と熱回収に使用しています。これらのインストールは、より大きな直径、より高い圧力クラス、より厳しい文書化を必要とし、地中熱源アレイと他の熱源を組み合わせることが多いです。
既存の暖房ネットワークの改修。ますます一般的なプロジェクトタイプとして、既存の建物群を供給する従来のボイラ設備を地中熱システムに置き換えるか、補完するもので、既存の室内配管を再利用し、新しい埋設配管を追加します。改修工事は、サイズが多様でスケジュールに左右されるため、在庫を各サイズに備えているサプライヤーに有利です。
Standards, Testing, and Certification for Geothermal PE Pipe
地中熱用PEパイプは、通常、圧力水パイプと同じ規格に従って製造され、プロジェクトの仕様に地中ループ要件が追加されます。市場を規定するドキュメントを知ることで、生産者がサポートするツール、許容クラス、および試験体系が決まります。
| Reference | Scope | What it controls in production |
|---|---|---|
| ISO 4427 | PE pipes and fittings for water supply | Dimensions, tolerance grades, pressure classes, material designation |
| ISO 12162 | Classification of thermoplastic materials by MRS | PE80 and PE100 designation basis |
| ISO 1167 | Internal pressure resistance test | Hydrostatic hold tests at defined stress and temperature |
| ISO 1133 | Melt mass-flow rate determination | レジンが押出し中に変質していないことを確認します。 |
| ISO 11357 | Differential scanning calorimetry | 酸化誘導時間を測定すること, antioxidant reserve |
| ISO 13479 | Notched pipe test | Resistance to slow crack growth |
| ISO 22391 | 熱水と冷水用のPE-RT配管システム | PE-RT classes, dimensions, and performance |
| ASTM D3035 and ASTM F714 | PE pipe by controlled outside diameter | Dimension ratio system used in North American projects |
| ASTM D2513 and ASTM F2620 | PE piping and heat fusion practice | Fusion procedures qualification for buried joints |
| GB/T 13663 | PE pipes for water supply in China | Domestic dimensional and performance requirements |
| CE marking | Machinery safety in the European market | Guarding, electrical safety, documentation of the line |
| ISO 9001 | Quality management system | 追跡可能性, inspection records, corrective action |
Faygo equipment is CE and ISO certified, which addresses the machinery side of compliance. The pipe side belongs to the producer, but the equipment determines whether compliance is easy or a daily fight. Accurate temperature control protects oxidation induction time. A spiral die without weld lines protects notched pipe test performance. Precise haul-off control protects wall thickness and therefore pressure class. Adequate cooling protects ovality and residual stress. Buyers should read a machine specification as a list of the quality outcomes it enables, not as a list of components.
ドキュメンテーションの慣行は、このイメージを完成します。地中熱用パイプのバッチ記録では、レジンロット、生産日とシフト、ラインとレシピ、測定された寸法、および試験結果を一つの追跡可能なパッケージにまとめます。地区暖房の顧客は、入札段階でこのようなものを求める傾向があり、生産者がすでにその規律を持っていると、価格のみの競争相手が到達できない仕事を獲得します。
Investment Structure and 相対的なコスト Planning
PE地中熱ポンプパイプ製造所の設備予算は、機械、公共事業、ツール、工場作業、および運転資本に分かれます。価格は仕様、通貨、市場状況によって変動するため、以下の表は、各要素を相対的なスケールで表し、いつ読んでも構造が変わらないようにしています。
| Investment element | 相対的なコストレベル | Notes for planning |
|---|---|---|
| Coil line, 16 to 63 mm | Medium | Entry point for a geothermal pipe producer |
| Standard line, 20 to 110 mm | High | Widest market coverage per unit invested |
| Header line, 63 to 160 mm | Very High | Needed for district-scale mains supply |
| Barrier co-extrusion upgrade | Medium | 2台の押出機と層状ダイを追加します。 |
| Additional die and calibration tooling per size | Low to Medium | Budget one set per diameter you will sell |
| Long-length coiler with tension control | Medium | Essential for deep borehole U-bend coils |
| Online ultrasonic wall measurement | Medium | Pays back through reduced resin overuse |
| Melt gear pump | Low to Medium | Improves wall uniformity on thick-wall pipe |
| Chiller, cooling tower, compressed air | Medium | Size for peak line load plus reserve |
| Transformer and electrical distribution | Medium | Based on connected load, confirm with layout design |
| Laboratory: hydrostatic, MFR, oxidation induction time | Medium | Required to defend service life claims in tenders |
| Fusion equipment for sample and U-bend assembly | Low | Enables value-added pre-assembled loop supply |
| Resin working capital | High | Largest ongoing cost, dominates unit economics |
| 設置, commissioning, training | Low | Included in the Faygo turnkey scope |
2つの計画現実を明白に述べる価値があります。レジンは完成したメートルのパイプのコストを支配するため、レジンの過剰使用を減らすもの、たとえば厚壁制御、切り替え時の低スクラップ、および正確な測定は、機械の寿命中により多くのものをもたらします。また、停止したラインは、少しでもコストがかかったラインよりはるかに高価であるため、先行テスト、スペアパーツの可用性、および迅速な技術サポートは、投資分析に含まれるべきです。
Energy use is the second operating lever. A grooved-feed extruder with a well-matched barrier screw converts more of its motor energy into useful melting and less into unnecessary shear heat, and inverter or servo drives on the haul-off and pumps cut idle consumption. Over a decade of continuous operation these differences accumulate into a meaningful share of the total cost of ownership.
サービス、サポート、およびトータルデリバリ Faygo
Faygoは、地中熱用パイプラインを最初の問い合わせから生産の数年間までサポートし、以下のコミットメントはWanplasブランドレベルのポリシーをすべてのWanplas工場で適用します。その意図は明白です。買い手は迅速に販売可能なパイプを生産しなければならず、部品が故障したときに立ち往生することは決してありません。
選択とエンジニアリング。注文を入れた前には、Faygoエンジニアは、顧客のパイプ計画、目標出力、樹脂グレード、および都市公共施設の条件をもとに、スクリューおよびダイの仕様、タンク長、収集およびコイラーのサイジング、およびインストールした電力を定義します。これにより、一般的な失敗である、販売されるサイズが含まれていない直径範囲でラインを購入することを避けられます。
工場コンサルティング。Faygoは、水と電気の設計、工場の3Dレイアウト、労働者の構成とトレーニング計画、および完全な新工場建設サポートをゼロから提供します。既存の生産者は、ゼロダウンタイムのアップグレードとして古い機械の交換サービスを利用することができます、または既存のフロアでボトルネックを特定して排除し、出力を上げるための容量拡大サービスを利用できます。
72時間連続運転テスト。すべてのラインは、工場から出荷される前に72時間連続で工場内で運転され、実際の状況下でパイプを生産します。寸法、出力、安定性、および制御応答がその実行中に確認されます。顧客は、実際にそのラインを運転するために、工場を訪れることを歓迎します。地中熱の顧客は、この最後の簡単な機会で構成を調整するために、多くの場合、工場を訪れます。
オープンファクトリー方針Faygoは、すべてのWanplas工場と同様に、オープン工場ポリシーを維持しており、上海空港から約2時間の距離にある張家港工場を訪問することを歓迎します。訪問者は、機械加工、組み立て、およびテストエリアを見て、機械を構築するエンジニアと直接話すことができます。
設置、試運転、およびトレーニング。エンジニアは、設置と試運転のために現地に出向き、ラインを安定した生産に運び、スタートアップとシャットダウンの手順、レシピ管理、サイズの切り替え、ダイと校正スリーブの手入れ、冷却システムのメンテナンス、およびトラブルシューティングについてオペレータにトレーニングします。トレーニングは、機械をどのように運転するかだけでなく、寸法が許容外にならない場合にそれを修正する方法についても説明します。
予備品ポリシーWanplasは、顧客に年間500米ドルの無料部品を提供し、保証期間内に破損した部品の無償交換も行います。Faygoは、パイプ工場が地元で保有すべき摩耗部品、通常は校正スリーブ、ヒーターバンド、熱電対、シール、フィルタスクリーン、およびハウルオフパッドなどについてもアドバイスします。そのため、日常的な摩耗品が生産停止につながることはありません。
技術サポートとリモートアシスタンス。オンラインテクニカルサポートは24時間対応しており、制御およびドライブの問題のリモート診断により、多くの問題を現場訪問なしに解決できます。プロセスに関する質問については、Faygoのエンジニアが新しい樹脂品種や新しいパイプサイズのパラメータレシピを最適化し、お客様が実験することなく解決します。
グループレベルの保証。 The Wanplas brand promises cover transportation, production capacity, and quality standards, including compensation terms if delivered quality falls short of the agreement. The brand mission, warming global customers with China plastic machinery, is expressed through these concrete commitments rather than slogans.
Turnkey scope. For buyers building a new geothermal pipe plant, Faygo delivers end-to-end: selection, design, manufacturing, installation, commissioning, training, and maintenance. A single point of responsibility across that chain is what separates a project that starts producing on schedule from one that stalls between suppliers.
よくある質問
What diameter range should a new geothermal pipe producer start with?
ほとんどの新しい生産者は、縦のU型脚と横のループパイプが主に25 mmから40 mmの範囲に属し、コイルラインで出荷されるため、16 mmから63 mmのコイルラインから始めます。その単一の構成は、地上配列需要の大半をカバーします。63 mmから160 mmのヘッダーとメインの直径は、地域規模の契約が投資を正当化した後、第二ラインに追加されることが多くなります。
地中熱源ヒートポンプ用配管の場合、なぜPEが金属よりも優れているのでしょうか？
Polyethylene cannot corrode electrochemically, so buried loops are immune to soil chemistry, galvanic action, and stray currents that attack steel and copper. It is also joined by heat fusion, producing homogeneous joints as strong as the pipe wall, and it ships in long coils that eliminate joints inside a grouted borehole. The lower wall conductivity is outweighed by the fact that grout and ground resistance dominate the heat transfer path.
How long can a single coil be, and why does it matter for boreholes?
Coil length is limited by the coiler and by handling practicality, and geothermal producers routinely supply coils of several hundred meters. It matters because a vertical U-bend must run down the borehole and back with no joint, so a 150 meter borehole needs more than 310 meters of continuous pipe. Faygo sizes the coiler to the deepest borehole a customer expects to serve.
コイル状地中配管パイプで楕円化の問題はどのように生じますか？
Ovality usually comes from insufficient cooling before the coiler, excessive coiling tension, a coil diameter too small relative to pipe diameter, or unstable vacuum in the calibration tank. Pipe that is still warm when it is wound will take a flattened set. Adding cooling tank length, lowering the final water temperature, and controlling coiler tension normally resolves the problem.
Can one line produce both PE100 ground loop pipe and PE-RT building circuits?
限度があるものの可能です。16mmから63mmのコイルラインは、適切なねじ選択とレシピ変更により、PE100、PE80、およびPE-RTを運ぶことができます。これは、地上アレイとビルディングサイドの両方を対象とする生産者に適しています。非常に高い出力は、ねじジオメトリとダイコンフィギュレーションを最適化できるようにするため、専用ラインでより適切です。
生産中の壁厚はどのように制御されていますか？
壁厚はエクストラーダ出力とハウルオフ速度の比率であるため、オペレータは目標速度を一定にし、測定された壁厚を標準最小値よりわずかに大きくしてスクリュースピードを調整します。安定した溶融温度、安定した溶融圧力、および一定の真空がそれを維持します。オンライン超音波測定により、生産者は年間を通じて樹脂を節約できる安全マージンを小さくし、損傷した部品を保証期間内に無償で交換できます。
地熱用パイプ工場ではどのような試験を自社で実施すべきでしょうか？
At minimum, dimensional checks on every shift, melt flow rate on incoming resin and finished pipe, oxidation induction time to confirm the antioxidant reserve survived processing, and hydrostatic pressure testing to the applicable standard. Notched pipe testing for slow crack growth is added when supplying tenders that demand it. These results together support a documented 50-year design life claim.
What does Faygo include with the machine after delivery?
すべてのラインは出荷前に72時間の連続運転テストを実施し、その後、現地設置と試運転、オペレータおよびメンテナンストレーニング、24時間対応のオンライン技術サポート、年間500米ドルの無料部品、および保証期間内の損傷部品の無償交換を提供します。新しい工場を計画している購入者に対して、水と電気の設計、3Dワークショップレイアウト、および容量の拡張に関する工場コンサルティングが提供されます。
地熱用パイプラインについてFaygoにお問い合わせください
Anti-corrosion PE ground source heat pump pipe is a product where manufacturing quality is invisible at the moment of sale and decisive thirty years later. Round pipe with even walls, clean melt, preserved antioxidant reserve, and long joint-free coils is what allows a geothermal central heating pipeline engineering project to be buried and forgotten in the best possible sense. Producing that pipe consistently takes an extrusion line engineered around the diameter band, the coil length, and the resin the market actually demands.
Faygo, a Wanplas factory, brings 22 years of pipe and profile extrusion experience, three specialized factories, a 26,650 square meter FAYGOPLAST plant in Zhangjiagang, 13 national patents including 8 invention patents, and CE and ISO certified equipment covering 12 mm to 575 mm across PE, PP, and PVC. Ground loop coil lines, header lines, PE-RT and PP-R circuit lines, and corrugated conduit lines are all built on that platform, tested for 72 continuous hours before shipment, and backed by installation, training, warranty replacement, and 年間500米ドル分の無償部品
Send your pipe program, the diameters and pressure classes you intend to sell, the deepest borehole in your market, your target annual tonnage, and your available power and water conditions, and the Faygo engineering team will return a complete line configuration with screw and die specification, tank lengths, haul-off and coiler sizing, installed power, and a workshop layout. You are equally welcome to visit the Zhangjiagang workshop, watch a geothermal pipe line running under test, and talk through factory planning, training, and capacity expansion with the engineers who will build your equipment.
