Indoor geothermal, more commonly called floor heating, has become the default comfort solution for residential apartments, villas, schools, hospitals and light-commercial buildings across Europe, Central Asia and East Asia. The pipe that carries warm water through the screed is no longer a plain polyethylene tube. Modern specifications demand an oxygen barrier layer that blocks dissolved oxygen from entering the circuit, because oxygen in the water accelerates corrosion of the metal components of the heating system. Oxygen Barrier PE Floor Heating Pipe Precision Extrusion Equipment For Indoor Geothermal Heating Pipeline Installation is therefore a precision multi-layer co-extrusion system, not a simple single-material pipe line. Faygo, a Wanplas factory with 22 years of dedicated experience in plastic pipe and profile extrusion, designs and builds the multi-layer co-extrusion lines that produce oxygen barrier PE-RT floor heating pipe for indoor geothermal heating pipeline installation. Operating three specialized factories, including the FAYGOPLAST facility in Zhangjiagang City covering 26,650 square meters and only two hours from Shanghai Airport, and holding 13 national patents with 8 invention patents, Faygo delivers CE and ISO certified equipment together with complete turnkey solutions to customers in dozens of countries. This article explains the structure and standards of oxygen barrier floor heating pipe, the material system behind PE-RT and EVOH, the architecture of a precise five-layer co-extrusion line, the Faygo line configurations available, and the process, quality and service framework that keeps a production line running to specification for years.
The central engineering problem of this product is not melting polyethylene. It is holding a very thin, moisture-sensitive ethylene vinyl alcohol copolymer layer exactly where it belongs, at a stable thickness, through a high-speed continuous extrusion process, while three or four other melts flow around it without disturbance. Get that right and the pipe passes the oxygen permeability limit with margin and a long service life. Get it wrong and the barrier layer breaks, delaminates or disappears, and the pipe fails its most important function. The remainder of this article is a practical, equipment-focused guide to achieving that control.
Oxygen Barrier Pipe Structure and Governing Standards
An oxygen barrier floor heating pipe is defined by what you cannot see: the thin functional layer of EVOH (ethylene vinyl alcohol copolymer) that stops oxygen diffusion. The pipe only works as a system, so the producer must control the whole stack of layers, not just the base polymer. The industry has settled on two practical constructions, and choosing between them is the first decision a line buyer makes.
The five-layer structure and the three-layer alternative
The five-layer (often written 5-layer) structure, from the inner bore outward, is PE-RT base pipe, tie layer, EVOH oxygen barrier layer, tie layer and an outer PE protection layer. The two tie layers are adhesive resins that bond the non-polar polyethylene to the polar EVOH so the barrier layer cannot peel away. The outer PE layer shields the EVOH from scratches, UV and mechanical abuse during coiling, transport and installation.
The three-layer (3-layer) structure collapses the stack into PE-RT, a combined adhesive plus EVOH barrier layer, and an outer PE layer. In some designs the EVOH is co-extruded with an integral adhesive so only three physical layers are formed. The three-layer design uses fewer extruders, a simpler co-extrusion die head and a lower equipment cost, while the five-layer design gives the most robust barrier protection and the best defense against handling damage.
Both constructions must meet the same oxygen permeability limit. The layer count is an equipment and durability choice, not a compliance shortcut.
Oxygen permeability requirement and governing standards
The decisive performance number is oxygen permeation. For oxygen barrier floor heating pipe the requirement is oxygen permeability of 0.32 mg per cubic meter per day or lower, measured at 40 degrees Celsius, under the DIN 4726 method. This limit exists because oxygen that diffuses through the pipe wall into the water reacts with steel, brass and aluminum components such as manifolds, valves, pumps and radiators, accelerating corrosion and shortening system life.
Several standards frame the product and the line that makes it. GB/T 28799 covers polyethylene of raised temperature resistance (PE-RT) piping systems for hot and cold water installations. ISO 22391 covers PE-RT piping systems for hot and cold water installations. DIN 4726 specifies requirements and test methods for plastic piping systems used in floor heating and radiator connection, including the oxygen permeability limit. ASTM F2623 covers test methods for determining the oxygen gas transmission rate of polyethylene pipe and tubing. These standard names appear in plain text only; the article contains no linked references. A production line is judged by its ability to make pipe that passes all of them consistently, not once but across every coil of every shift.
Material System for Oxygen Barrier Floor Heating Pipe
Material selection decides the processing window, the line speed and the final cost. Three polymer families matter: PE-RT as the structural base, PEX as the main alternative crosslinked base, and EVOH as the barrier. Each behaves differently in the barrel and at the die head.
PE-RT Type I and Type II properties
PE-RT (polyethylene of raised temperature resistance) is a specially nucleated, moderately crosslinkable polyethylene that keeps the ease of processing of a thermoplastic while gaining improved high-temperature performance. Type I and Type II are the two common grades for floor heating. The density sits in the range 0.933 to 0.947 grams per cubic centimeter. The melt flow rate at 190 degrees Celsius under 2.16 kilograms load is typically 0.5 to 1.0 grams per 10 minutes. The long-term service temperature is about 70 degrees Celsius with a short-term peak around 95 degrees Celsius, and the material sustains the required hydrostatic strength for the design life of the system.
Type II PE-RT offers a higher design stress and better high-temperature capability than Type I, which is why many modern floor heating coils specify Type II. From an extrusion standpoint both are processed as thermoplastics, so the line can run without the post-extrusion crosslinking step that PEX requires. That single fact is why PE-RT dominates oxygen barrier floor heating pipe production and why the co-extrusion line described here centers on PE-RT.
PEX crosslinking alternatives (a, b, c)
PEX (crosslinked polyethylene) is the long-established alternative base for floor heating pipe. The three crosslinking routes are PEX-a (peroxide crosslinking, highest crosslink degree, most uniform), PEX-b (silane or moisture crosslinking, good balance of cost and performance) and PEX-c (electron-beam or radiation crosslinking, precise control, no chemical crosslinker). All three deliver excellent high-temperature and pressure resistance, but PEX requires a crosslinking step after extrusion, which complicates the line and the quality chain. Because the oxygen barrier co-extrusion focus of this article is on PE-RT, PEX is noted for comparison only; the equipment described is built around thermoplastic PE-RT processing.
EVOH oxygen barrier layer and ethylene content
The oxygen barrier layer (EVOH) is an ethylene vinyl alcohol copolymer whose oxygen barrier performance comes from the hydrogen-bonded hydroxyl groups of the vinyl alcohol segments. The ethylene content is the key variable. At 32 mol percent ethylene, EVOH offers an excellent balance of barrier performance and processability, with enough flexibility and melt strength to form a continuous thin layer. At 38 mol percent ethylene, the barrier is slightly reduced but processability and moisture resistance improve, making it easier to handle and co-extrude at higher line speeds. The choice between 32 and 38 mol percent ethylene is a trade between maximum barrier and easier, faster processing.
The dominant practical issue with EVOH is moisture. EVOH is highly hygroscopic and absorbs water from the air, and that water must be removed before the material enters the barrel. Undried EVOH flashes into steam in the melt and produces bubbles, surface splay, weak interlayer bonding and a discontinuous barrier. A dedicated dehumidifying dryer sized to the EVOH throughput is therefore a mandatory part of the line, not an optional accessory. The drying requirement is one of the defining differences between a barrier pipe line and a commodity pipe line.
Anatomy of a Precision Multi-Layer Co-Extrusion Line
A multi-layer oxygen barrier pipe line is a tightly synchronized chain of extruders, a co-extrusion die head, a vacuum calibration tank, a cooling section, a haul-off unit, a measurement station, a cutting or coiling unit and a centralized control system. Each station must be matched to the others or the thin barrier layer drifts out of tolerance.
Main extruder and barrier screw design
The main extruder Plasticizes the PE-RT base and forms the bulk of the pipe wall. A single-screw extruder with a length-to-diameter ratio in the range 30 to 33 is standard. The screw is a barrier screw, meaning it carries a secondary flight that separates molten material from solids, improving melt homogeneity and pressure stability. Stable melt pressure is the single most important condition for a stable barrier layer, because pressure fluctuation in any extruder translates directly into layer thickness variation. The main extruder barrel is heated in multiple independently controlled zones so the PE-RT melt reaches its window of roughly 200 to 230 degrees Celsius without hot spots.
Side extruders and co-extrusion architecture
A five-layer line uses two to four side extruders in addition to the main extruder. One small side extruder Plasticizes the EVOH barrier layer, two feed the tie layers, and a fourth may form the outer PE protection layer. A three-layer line needs fewer: one for the barrier and one for the combined adhesive, or a single barrier extruder with the adhesive metered inline. Each side extruder is smaller in screw diameter than the main unit, but each must hold its own melt pressure steady, because the barrier layer thickness is set almost entirely by the ratio of EVOH throughput to line speed.
Multi-layer co-extrusion die head
The co-extrusion die head is the heart of the line. Two geometries dominate. The spiral mandrel die builds each layer around a rotating helical channel and is excellent for round, symmetric pipes because it gives uniform circumferential distribution. The stacked or layer-by-layer die forms the layers in discrete annular plates and is easier to reconfigure for different layer counts. Both types must balance the flow of every melt so that the EVOH layer stays centered and the tie layers stay uniform around the full circumference. Flow balancing is done by adjusting restrictor rings and runner geometry, and it is verified by cutting samples and measuring layer thickness at multiple points around the cross-section.
Melt temperature window matching
The hardest part of oxygen barrier co-extrusion is matching the melt temperature windows of PE-RT and EVOH. PE-RT processes at roughly 200 to 230 degrees Celsius. EVOH processes at roughly 200 to 220 degrees Celsius. The windows overlap, but they are not identical, and the EVOH side is far less forgiving. If the two melts meet at the die head with a large viscosity gap, the thinner, higher-viscosity EVOH can be dragged, thinned or broken by the faster PE-RT flow. Matching the melt temperatures keeps both layers in a comparable viscosity range so the barrier layer stays continuous and centered. Die head temperature profiling, independent side-extruder barrel control and careful selection of EVOH grade are the tools that achieve this match.
Faygo Line Configurations and Specification Tables
Faygo offers its oxygen barrier capability on established product platforms rather than one-off machines. The two configurations below are built on the Faygo PP-R/PE-RT Pipe Extrusion Line and the Faygo Pipe Extrusion Core Series, both of which are real Wanplas-group product lines used for pipe diameters from 12 to 575 millimeters with wall thickness up to 6.5 millimeters. The tables list the parameters a buyer actually evaluates.
Faygo PP-R/PE-RT Pipe Extrusion Line, five-layer oxygen barrier configuration
This configuration is the standard choice for 16 to 32 millimeter PE-RT floor heating pipe with a full five-layer EVOH barrier. It pairs a 60 millimeter barrier-screw main extruder with dedicated side extruders for tie, EVOH and outer PE, and it is the configuration most floor heating coil producers start with because it delivers the most robust barrier at moderate output.
| Parameter | Faygo Specification |
|---|---|
| Applicable pipe diameter | 16 to 32 mm (PE-RT floor heating pipe) |
| Main extruder screw diameter / L/D | 60 mm / 33:1 (barrier screw) |
| Side extruders (co-extrusion) | 1 x 30 mm (EVOH) + 2 x 25 mm (tie layers) + 1 x 30 mm (outer PE) |
| Co-extrusion layers | 5 (PE-RT / tie / EVOH / tie / PE outer) |
| Output | 60 to 120 kg/h |
| Line speed | 8 to 25 m/min |
| Installed power | 145 kW |
| Calibration and cooling section length | vacuum calibration tank 6 m + spray cooling tank 12 m |
| Haul-off type | 2-caterpillar belt haul-off unit |
Faygo Pipe Extrusion Core Series, high-output multi-layer configuration
For producers targeting higher hourly output on 16 to 25 millimeter pipe, the Faygo Pipe Extrusion Core Series high-output multi-layer configuration uses a larger 75 millimeter main extruder and supports selectable three or five layers. This configuration raises line speed and output while keeping the same precision control philosophy, and it suits large floor heating coil manufacturers and exporters.
| Parameter | Faygo Specification |
|---|---|
| Applicable pipe diameter | 16 to 25 mm |
| Main extruder screw diameter / L/D | 75 mm / 33:1 (barrier screw) |
| Side extruders (co-extrusion) | 1 x 40 mm (EVOH) + 1 x 30 mm (adhesive composite) + 1 x 30 mm (outer) |
| Co-extrusion layers | 3 or 5 selectable |
| Output | 120 to 200 kg/h |
| Line speed | 12 to 40 m/min |
| Installed power | 185 kW |
| Calibration and cooling section length | vacuum calibration tank 6 m + spray cooling tank 14 m |
| Haul-off type | 3-caterpillar belt haul-off unit |
Both configurations share the Faygo intelligent control system, which lets the operator set parameters freely and adjust them in real time, and both use internationally sourced electrical components for reliability. The choice between them is driven by target diameter, layer count and hourly output rather than by any difference in control philosophy.
Die Head and Layer Thickness Control
The die head is where the barrier layer is born, and layer thickness control is where most quality problems are won or lost. The objective is a thin, continuous, centered EVOH layer whose thickness stays inside a tight band for the entire length of the coil.
Controlling EVOH layer thickness and deviation
The functional EVOH layer is typically held at 0.08 to 0.15 millimeter. Thinner than that risks discontinuity; thicker wastes an expensive material and slows the line. The engineering target is to hold the layer thickness deviation within plus or minus 10 percent, measured around the circumference and along the length. Deviation is controlled by stabilizing the EVOH extruder melt pressure, balancing the die head flow channels, and tuning the die lip adjustment. A small change in screw speed or melt temperature moves the layer thickness immediately, so the control system must treat the EVOH extruder as a precision metering device, not a rough feeder.
Interlayer adhesion and peel strength
The tie layers exist to bond polyethylene to EVOH, and their thickness and placement determine the interlayer peel strength. Too little tie resin and the barrier delaminates during coiling or on the building site; too much adds cost without benefit. Peel strength is verified by a layered peel test on a cross-section sample, and it is sensitive to the melt temperature match described earlier: when PE-RT and EVOH meet at the correct, close temperatures, the tie layer wets both surfaces and bonds well. The die head must also keep the melt pressures of adjacent layers close so one layer does not overpower and thin the next.
Vacuum Calibration and Cooling
Once the multi-layer melt leaves the die head it must be frozen into the exact outside diameter and roundness before it can move. This is the job of the calibration and cooling section, and it is where ovality and surface quality are set.
Calibration sleeve and vacuum level
The pipe is pulled over a calibration sleeve, a precision-bored tube that sets the outside diameter. The sleeve material is typically brass or stainless steel, with stainless steel preferred for wear resistance and clean surface. A vacuum is drawn through slots in the sleeve to pull the soft melt firmly against the bore. The practical vacuum range is -0.02 to -0.06 MPa. Too little vacuum and the pipe does not seat; too much and the wall is sucked thin or the surface marks. The vacuum calibration tank holds the sleeve and the first, most aggressive cooling water.
Water temperature gradient and ovality
Cooling is staged as a temperature gradient rather than a single cold bath. The first section runs at 12 to 18 degrees Celsius to set the shape quickly without thermal shock that would lock in stress, and later sections run progressively warmer to complete cooling gently. The cooling length must be matched to the line speed: at high speed the pipe needs more tank length to reach the same final temperature, or it exits soft and oval. Ovality, the deviation of the cross-section from a true circle, is controlled by stable vacuum, balanced water temperature and a calibration sleeve in good condition. A pipe that leaves the tank oval will stay oval and may fail dimensional checks at the building site.
Haul-Off, Measurement, and Coiling
The downstream end of the line measures, cuts or coils and packages the finished pipe. Precision here protects the investment made upstream.
Synchronization and online measurement
The haul-off unit pulls the pipe at exactly the line speed set by the extruder output. A caterpillar haul-off uses belts or pads that grip the pipe without crushing it, and its speed synchronization with the extruder and cutter is what prevents thickness drift and the bamboo-joint surface defect. Online laser diameter measurement gives the outside diameter in real time, and the tolerance target is plus or minus 0.1 to 0.3 millimeter depending on diameter. Ultrasonic wall thickness measurement checks the wall around the circumference without cutting the pipe, catching eccentricity early. A meter counter records length for coil or package labeling.
Metering and automatic coiling
Floor heating pipe is usually delivered as coils rather than straight lengths, so an automatic coiler winds the pipe to a set length and then the cutting unit severs it cleanly. The coiler must wind without kinking or over-tensioning, because a kink becomes a weak point in the floor. Packaging follows, often with a printed label carrying the material, diameter, length and standard marks. The whole downstream sequence is tied into the central control system so a speed change at the extruder propagates instantly to the haul-off, cutter and coiler.
Reference Process Parameters for Common Pipe Sizes
The table below gives reference process parameters for the most common oxygen barrier floor heating pipe sizes. These are starting points; every line is tuned to its own screw, die head and material batch. The temperatures are barrel zone settings feeding toward the die head, the vacuum and water values are the calibration and first cooling targets, and the output and line speed are the resulting operating point.
| Pipe size (mm) | Output (kg/h) | Line speed (m/min) | Barrel zone temp (deg C) | Die head temp (deg C) | Vacuum (MPa) | Cooling water (deg C) |
|---|---|---|---|---|---|---|
| 16 x 2.0 | 45 to 70 | 12 to 20 | 190 / 215 / 225 / 230 | 210 to 225 | -0.03 to -0.05 | 14 to 18 (1st), 20 to 30 (later) |
| 20 x 2.0 | 60 to 95 | 10 to 16 | 190 / 215 / 225 / 230 | 210 to 225 | -0.03 to -0.05 | 14 to 18 / 20 to 30 |
| 25 x 2.3 | 80 to 120 | 8 to 13 | 190 / 220 / 228 / 232 | 212 to 226 | -0.04 to -0.06 | 14 to 18 / 20 to 30 |
The EVOH and tie side extruders run at their own lower throughputs, set to deliver the target layer thickness at the chosen line speed. Operators optimize the whole set together, because changing line speed without rebalancing the side extruders is the fastest route to a non-compliant barrier layer.
Quality Inspection Items
A compliant oxygen barrier pipe line is validated by a defined set of tests, run on samples taken from production. The table lists the standard inspection items and the acceptance the line must support.
| Test item | Condition | Acceptance |
|---|---|---|
| Hydrostatic test | 95 deg C / 1000 h | No failure, no leakage |
| Oxygen permeability | 40 deg C, DIN 4726 | 0.32 mg/(m3·d) or lower |
| Layer thickness | Microscopy cross-section | EVOH 0.08 to 0.15 mm, deviation within plus or minus 10 percent |
| Peel strength | Interlayer | No delamination |
| Longitudinal reversion | Per standard | 3 percent or lower |
| Melt flow rate | 190 deg C / 2.16 kg | 0.5 to 1.0 g/10min |
| Carbon black dispersion | If applicable | Even, no agglomeration |
| Appearance and ovality | Visual plus gauge | Smooth surface, ovality within tolerance |
The oxygen permeability test and the layer thickness microscopy are the two checks unique to barrier pipe; a commodity pipe line is not judged by them, which is why barrier production needs the extra control discipline described throughout this article.
Common Defects and Countermeasures
Even a well-designed line drifts. The table below maps the defects most specific to oxygen barrier co-extrusion to their usual cause and the corrective action, giving operators a fast reference.
| Defect | Typical cause | Countermeasure |
|---|---|---|
| EVOH layer break or discontinuity | Melt pressure fluctuation, insufficient drying | Stabilize screw speed and melt pressure, dry EVOH, raise pressure margin |
| Interlayer delamination | Poor tie layer, temperature mismatch | Optimize tie layer thickness, match melt temperatures |
| Bamboo-joint surface pattern | Calibration or haul-off speed mismatch | Synchronize haul-off, tune vacuum and pull ratio |
| Ovality out of tolerance | Unstable vacuum, uneven cooling | Adjust vacuum, balance water temperature gradient |
| Wall eccentricity | Die centering offset | Adjust die lip bolts, center the mandrel |
| Inner wall pitting | Moisture or gas, dirt in melt | Dry materials, clean die head, dehumidify EVOH |
| Color difference | Masterbatch or regrind variance | Standardize color masterbatch, control regrind ratio |
| Bubbles in barrier layer | EVOH not dried | Dry EVOH to required moisture, preheat hopper |
Most of these defects trace back to two root causes: unstable melt pressure and moisture in the EVOH. A line that controls those two variables tightly will, in practice, avoid the large majority of barrier-specific failures.
Floor Heating Engineering Side Requirements
The pipe line does not exist in isolation; it serves a building system with its own rules. The producer must understand the installation side because it drives the dimensional and coil requirements the line must meet.
The pipe is laid as a continuous coil in the screed, and the coil bending radius must be at least 5 times the pipe diameter (5D) to avoid kinking and to keep the wall stress within design limits. The construction temperature on site affects handling; very cold pipe becomes stiff and cracks if bent too sharply, so storage and lay-down conditions matter. The oxygen barrier exists specifically to protect the metal parts of the system, the manifolds, valves, pumps and mixing units, from corrosion caused by oxygen dissolved in the circulating water. A continuous, intact EVOH layer is what makes the 50-year system design life realistic, because without it the metal components would corrode long before the polymer pipe itself wore out. Producers who understand this relationship sell not just pipe but system reliability, and the line that makes a dependable barrier is the foundation of that promise.
Capacity, Energy Consumption, and Scrap Recycling
Beyond compliance, a buyer evaluates throughput, energy per kilogram and material economy. Output for the configurations above runs from 60 kg/h on the compact five-layer line to 200 kg/h on the high-output line, with the achievable number depending on diameter, wall thickness and layer count. Energy is usually expressed as kilowatt-hours per kilogram of good pipe, and it is minimized by right-sizing the extruders to the job, recovering heat where practical, and avoiding over-cooling that wastes chiller capacity.
Scrap is unavoidable at start-up and during grade changes, and a well-run line crushes start-up scrap and feeds it back. The rule for oxygen barrier pipe is strict: the online crushed regrind reuse ratio is controlled at 10 percent or lower, and EVOH layer scrap must never be mixed back into the polyethylene or tie layers. EVOH in the base resin would contaminate the melt, change the processing behavior and ruin the barrier. Clean separation of the barrier scrap from the structural scrap is therefore a non-negotiable part of the material handling design. Relative equipment and operating cost tiers for this category run from Medium for a basic three-layer line to High or Very High for a fully instrumented five-layer line with automatic thickness control, while the EVOH resin itself places the material cost at Premium compared with plain PE-RT.
Selection Guide: Matching Requirement to Faygo Configuration
The table below turns a buyer’s requirement into a recommended Faygo configuration. It is a starting point for a detailed quotation; final selection also depends on local utility conditions, available floor space and target market standards.
| Pipe diameter | Layer structure | Target output | Recommended Faygo configuration |
|---|---|---|---|
| 16 to 20 mm | 5-layer | 60 to 120 kg/h | Faygo PP-R/PE-RT Pipe Extrusion Line, five-layer oxygen barrier configuration |
| 16 to 25 mm | 3 or 5-layer | 120 to 200 kg/h | Faygo Pipe Extrusion Core Series, high-output multi-layer configuration |
| 20 to 32 mm | 5-layer, thicker wall | 80 to 150 kg/h | Faygo PP-R/PE-RT Pipe Extrusion Line with enlarged calibration and cooling |
| Trial or R and D small batch | 3 or 5-layer | Low | Faygo Pipe Extrusion Core Series with lab-scale co-extrusion die head |
For producers who also run PPR or plain PE pipe, the same Faygo platforms switch between products by changing the die head and screw setup, which protects the original equipment investment and shortens the payback period. The Wanplas group can supply complementary downstream and auxiliary equipment for a complete plant where a broader product mix is planned.
Anwendungen Across Industries
Oxygen barrier PE-RT floor heating pipe serves a wide set of real end products, and naming them helps a buyer see the market:
- Floor heating engineering – the primary market: coils laid in screed for residential apartments, villas, schools, hospitals and offices, delivering even, comfortable low-temperature radiation heat.
- Building water supply – warm and cold potable and circulating water lines where the barrier protects connected metal fittings and extends system life.
- HVAC (heating, ventilation and air conditioning) – low-temperature heating and cooling distribution loops, including radiant ceiling and wall systems that share the same pipe technology.
- Municipal and district heating – pre-insulated secondary network pipes where the barrier reduces corrosion of steel components in the energy station and manifold rooms.
- Agricultural irrigation – greenhouse and nursery heating loops and controlled-environment cultivation systems that use warm-water circulation through the same class of pipe.
The most visible end product is the floor heating coil itself, typically 16 or 20 millimeter PE-RT with an EVOH barrier, delivered on reels with a printed label. Manifold branch pipes, riser connections and radiant loop returns are the other common fabricated items that depend on the same consistent barrier quality.
Service and Support from Faygo
A precision barrier line is a long-term asset, and Faygo supports it across its whole life. As a Wanplas factory, Faygo applies the group’s shared service commitments while adding pipe-line-specific expertise.
- Testing before shipment – every line runs a 72-hour continuous operation test at the factory before delivery, so commissioning starts from a proven baseline rather than a cold commissioning gamble.
- Installation and commissioning – engineers supervise on-site installation, alignment, piping and first production, tuning the die head and calibration to the customer’s material.
- Spare parts policy – Faygo provides USD 500 free spare parts every year together with warranty replacement for damaged parts, keeping routine maintenance affordable.
- Training – operators and maintenance staff are trained on start-up, parameter setting, layer control, cleaning the EVOH side and routine troubleshooting.
- Remote operation and maintenance – the intelligent control system supports remote monitoring and diagnosis, so process drift can be analyzed without a site visit.
- Open factory – customers are welcome to visit the Zhangjiagang facilities, review the production process and audit quality before and after purchase.
- Full-plant turnkey consultation – through the Wanplas group, Faygo advises on water and electricity design, factory site layout with 3D workshop planning, worker configuration and training, new factory construction from zero, old machine replacement with zero downtime, and capacity expansion that removes bottlenecks.
This end-to-end support is what lets a first-time pipe producer reach a stable, compliant barrier product without building the know-how from scratch, and it is a core part of the Faygo value proposition for international buyers.
Frequently Asked Questions
What is the difference between five-layer and three-layer oxygen barrier floor heating pipe?
A five-layer pipe stacks PE-RT, tie, EVOH, tie and an outer PE protection layer, giving the most robust barrier and the best protection of the EVOH from mechanical damage during coiling and installation. A three-layer pipe combines the two tie layers into one adhesive composite or places the EVOH with an integral adhesive, reducing equipment cost and complexity while still meeting the oxygen permeability limit. The five-layer structure is preferred where handling abuse and long-term abrasion are concerns.
Why must the melt temperature windows of PE-RT and EVOH be matched in co-extrusion?
PE-RT processes at roughly 200 to 230 degrees Celsius while EVOH processes at roughly 200 to 220 degrees Celsius. If the two melts meet at the die head with a large temperature gap, viscosity mismatch causes layer instability, thickness drift and weak interlayer adhesion. Matching the melt temperatures keeps both layers in a stable, comparable viscosity range so the EVOH layer stays continuous and centered.
How thin can the EVOH oxygen barrier layer be and still meet the DIN 4726 limit?
In practice a controlled EVOH layer of 0.08 to 0.15 millimeter already provides an oxygen permeability well below 0.32 mg per cubic meter per day at 40 degrees Celsius. The engineering challenge is not the absolute minimum thickness but holding the thickness stable within plus or minus 10 percent across the full length and across speed changes, which is why precision co-extrusion control matters more than chasing an ultra-thin layer.
What causes EVOH layer discontinuity and how is it prevented?
Discontinuity usually comes from melt pressure fluctuation in the EVOH extruder, inadequate drying of the EVOH, or a clogged or unbalanced flow channel in the co-extrusion die head. Prevention means stabilizing screw speed and melt pressure, drying EVOH to the required moisture level, balancing the spiral mandrel flow and verifying layer continuity by cross-section microscopy on a regular schedule.
Why does EVOH need drying before co-extrusion and what happens if it is not dried?
EVOH is highly hygroscopic and absorbs moisture from the air. If it enters the barrel with excessive moisture, the water flashes into steam in the melt, creating bubbles, surface splay, weak interlayer bonding and a discontinuous barrier layer. A properly sized dehumidifying dryer brings the moisture down to the required level and keeps it there before the material reaches the co-extrusion die head.
Which Faygo configuration should I choose for 16 to 32 millimeter PE-RT oxygen barrier pipe?
For standard 16 to 32 millimeter five-layer PE-RT floor heating pipe at 60 to 120 kg per hour, the Faygo PP-R/PE-RT Pipe Extrusion Line in its five-layer oxygen barrier configuration is the typical choice. For higher output of 120 to 200 kg per hour on 16 to 25 millimeter pipe, the Faygo Pipe Extrusion Core Series high-output multi-layer configuration with selectable three or five layers is more suitable. Final selection depends on target diameter, layer structure and hourly output.
How is oxygen permeability verified for an oxygen barrier pipe production line?
Samples are cut from the production run and tested in a permeation cell at 40 degrees Celsius following DIN 4726, and cross-checked against GB/T 28799 and ISO 22391 requirements. A compliant oxygen barrier pipe must show oxygen permeation of 0.32 mg per cubic meter per day or lower. Layer thickness and continuity are confirmed by microscope cross-section alongside the permeation result.
What support does Faygo provide for installation, commissioning and spare parts?
Faygo runs a 72-hour continuous operation test before delivery, supplies on-site installation and commissioning, provides USD 500 free spare parts every year with warranty replacement, delivers operator training, supports remote operation and maintenance, welcomes factory visits and offers full-plant turnkey consultation through the Wanplas group.
Conclusion
Oxygen Barrier PE Floor Heating Pipe Precision Extrusion Equipment For Indoor Geothermal Heating Pipeline Installation is, at its core, a problem of holding a thin, moisture-sensitive EVOH layer stable inside a fast-moving polyethylene pipe. The technology that solves it combines a barrier-screw main extruder, two to four precisely metered side extruders, a flow-balanced multi-layer co-extrusion die head, a vacuum calibration tank and staged cooling, a synchronized haul-off unit, online measurement and disciplined material drying. Five-layer and three-layer constructions both meet the 0.32 mg per cubic meter per day oxygen limit at 40 degrees Celsius, and the choice between them is an equipment and durability decision rather than a compliance one.
Faygo, a Wanplas factory with 22 years of pipe and profile extrusion experience, three specialized factories, 13 national patents and CE and ISO certified production, builds these lines on the proven PP-R/PE-RT Pipe Extrusion Line and Pipe Extrusion Core Series platforms. Whether a buyer needs 60 kg/h on a compact five-layer line or 200 kg/h on a high-output multi-layer line, the control philosophy is the same: steady melt pressure, matched melt temperatures, balanced die head flow and clean EVOH handling. We invite you to send your target pipe diameter, layer structure and hourly output so our engineering team can propose a tailored configuration, arrange a factory visit, and run a sample trial on the actual line before you commit. Reliable oxygen barrier floor heating pipe starts with the right precision extrusion equipment, and that is what we build.
