A 3 layer polyethylene coated pipe is a carbon steel line pipe finished in our plant with an external three-layer polyethylene (3LPE) coating system - an epoxy primer for adhesion, a copolymer adhesive, and a thick polyethylene outer layer. We produce and test every pipe in-house to ISO 21809-1, DIN 30670 or GB/T 23257 as required, and deliver it as a ready-to-bury finished product. With our long experience in pipe manufacturing and coating, we make sure each pipe is built for reliable, long-term buried service.
Grade and Thickness
|
No. |
Nominal Diameter of Steel Pipe DN (mm) |
Epoxy Coating Layer (μm) |
Adhesive Layer (μm) |
Minimum Anticorrosive Coating Thickness (mm) – Standard Grade |
Minimum Anticorrosive Coating Thickness (mm) – Reinforced Grade |
|
1 |
DN≤100 |
≥120 |
≥170 |
1.8 |
2.5 |
|
2 |
100<DN≤250 |
≥120 |
≥170 |
2.0 |
2.7 |
|
3 |
250<DN<500 |
≥120 |
≥170 |
2.2 |
2.9 |
|
4 |
500≤DN<800 |
≥120 |
≥170 |
2.5 |
3.2 |
|
5 |
DN≥800 |
≥120 |
≥170 |
3.0 |
3.7 |
Product Advantages
Lower whole-life cost
strong corrosion protection reduces cathodic protection demand, coating repairs and maintenance over the pipeline's service life.
Wide supply flexibility
available on ERW, SSAW or LSAW pipe bases in API 5L X42–X80 grades, with coating thickness matched to soil conditions (normal or heavy grade).
Field-friendly design
the tough outer layer tolerates lifting, stacking and backfilling; ends are left clear for welding with simple field-joint coating.
Traceable quality
every 3 layer polyethylene coated pipe is marked with a unique production code linking it to its coating line, date and test record.
Applications
A 3 layer polyethylene coated pipe is widely specified for:
Long-haul oil and natural gas transmission pipelines
Urban gas distribution networks
Municipal water supply and irrigation projects
Petrochemical and industrial underground piping
Cross-country infrastructure programs requiring large volumes of reliably coated pipe
FAQ
Q: How does 3-layer PE coating compare with single-layer FBE?
A: Both protect against corrosion. 3LPE adds a thick polyethylene jacket on top of the epoxy, giving much better resistance to mechanical damage, soil stress and moisture ingress - the standard choice for buried pipelines.
Q: Can we weld coated pipes on site without damaging the coating?
A: Yes. Coating is stopped back from both pipe ends, and after welding the joints are completed with approved field-joint coating or heat-shrink sleeves, which we can supply.
Q: How long can coated pipes be stored outdoors before laying?
A: With end caps fitted and pipes on padded supports, standard 3LPE coating tolerates several months of outdoor storage; we advise limiting direct UV exposure for extended periods.
Q: Can you supply fittings and field-joint materials with the pipes?
A: Yes - matching bends, fittings and field-joint coating kits can be included in the same shipment for a one-stop supply.
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