3PE Coated Steel Pipe

3PE Coated Steel Pipe (Three-Layer Polyethylene)

Introduction:Our 3PE Coated Steel Pipe is the gold standard for long-distance buried oil, gas, and water pipelines. Engineered to meet international standards such as DIN 30670 and ISO 21809-1, our 3PE system provides a 50-year service life by combining the chemical adhesion of Fusion Bonded Epoxy with the robust physical protection of High-Density Polyethylene. This multilayer structure ensures zero moisture permeability and superior resistance to soil stress and mechanical impact, making it the preferred choice for major infrastructure projects in regions like Africa and the Middle East.

Structure:High-performance FBE primer, grafted copolymer adhesive, and a tough HDPE topcoat.

Key Benefits:Exceptional cathodic disbondment resistance and high impact strength.

Applications:Mainline transmission for oil, gas, and high-pressure water networks.

3PE Steel Pipe

Pipe Type:PE Coated Pipe, 2PE Coated Pipe, 3PE Coated Pipe

Application:Used for for natural gas, petroleum, water & sewage, and pipe systems

Specification:OD: 219mm~2020mm

WT: 5mm~25mm

LENGTH: 4mtr, 6mtr, 12mtr, 18mtr, 21mtr

MOQ: 1 Ton

Coating Standard:DIN 30670, DIN 30671, DIN 30678, SY/T0413-2002 etc.

Pipe Type: Submerged Arc Welded (LSAW/SSAW), Electric Resistance Welded

Ends:Plain,Beveled, Thread With Couplings Or Sockets; Plastic Caps And Steel Rings Can Be Provided if possible

Surface:Two/Three Layer Polyethylene Coating (2mm~4.5mm)

Packing:Waterproof Paper wrapped, Steel Strips bundled, two tags on each bundle

Coating technical data for final pipes

Test Property	Unit	Requirement (Standard)	Test Method
Peel Strength (Adhesion)	N/cm	≥100 (at 20°C) / ≥40 (at 50°C)	DIN 30670
Impact Resistance	J/mm	≥7	DIN 30670
Indentation Resistance	mm	≤0.2 (at 23°C) / ≤0.3 (at 50°C)	DIN 30670
Elongation at Break	%	≥600	ASTM D638
Cathodic Disbondment	mm	≤7 (at 65°C, 24h)	ASTM G42
Holiday Detection	kV	25 kV (No breakdown)	ASTM G62
Surface Resistivity	Ω	≥1012	DIN 30670

Overview of 3PE anti-corrosion steel pipe technology details

Parameter	Technical Detail / Requirement
Applicable Pipe Types	Seamless (SMLS), LSAW, SSAW, ERW
Diameter Range	88.9 mm – 2020 mm (Standard range)
Standard References	DIN 30670, CAN/CSA-Z245.21, ISO 21809-1, NF A49-710
Coating Thickness	Generally 2.0 mm to 3.7 mm (Depending on pipe diameter and project requirements)
Service Temperature	-40°C to +80°C
Surface Preparation	Sa 2.5 (Near-White Metal Blast Cleaning) as per ISO 8501-1
Anchor Profile	50 μm – 100 μm (Roughness for optimal FBE adhesion)

DIN 30670 Coating Thickness Table

Nominal Diameter (DN)mm	Outside Diameter (OD)mm	Type N (Normal) Class	Type S (Special) Class
		Min. Thickness (mm)	Min. Thickness (mm)
≤ DN 100	≤ 114.3	1.8	2.5
DN 100 < DN ≤ 250	114.3 < OD ≤ 273.1	2	2.7
DN 250 < DN ≤ 500	273.1 < OD ≤ 508.0	2.2	2.9
DN 500 < DN ≤ 800	508.0 < OD ≤ 813.0	2.5	3.2
> DN 800	> 813.0	3	3.7

Minimum 3LPE layer thickness range

Mkg/m	3LPELayerthickness(mm)
	Class A1	Class A2	Class A3	Class B1	Class B2		Class B3	Class C1	Class C2	Class C3
M≤15	18	21	26	13	18		23	13	17	21
15	20	24	30	15	21		27	15	19	24
50	24	28	35	18	25		31	18	23	28
130 300	2,6	3,2	3,9	2,2	2,8		3,5	2,2	2,5	3,2
300	32	38	47	25	33		42	25	30	38
Please note:The total required thickness may be reduced for SAW pipes by a maximum of 10%on joint seam. Class 1 and 2 for medium and light applications (sandy soil). Class 3-application in extreme conditions(rocky soil)or underwater.

Minimum thickness of 3LPE layer finished coating

Steel Pipe Sizes						Min Coating Thickness in mm
≤103/4”(273.1 mm)						2.5
>123/4”(323.9 mm)to≤18”(457 mm)						2.8
>20"(508.0 mm)to≤30"(762 mm)						3.0
>32"(813.0 mm)						3.3

3pe Coating Process For Steel pipes

Frequently Asked Questions

1. How do you verify coating quality on 3LPE coated steel pipe before shipment?

We implement internal quality control from raw material review to final shipment release. For orders related to buried gas pipelines, crude oil lines, and underground water transmission, buyers usually expect the product to match both the application and the supporting 3LPE coated steel pipe, DIN 30670, ISO 21809-1, and API 5L base pipe requirements.

2. Can you provide holiday test records, MTC, and third-party inspection for 3LPE pipe?

Yes. We can provide Mill Test Certificates according to EN 10204 3.1, and 3.2 can be arranged when required. Third-party inspection by agencies such as SGS, BV, or ABS can also be accepted before shipment.

3. How do you prevent coating scratches on 3LPE pipe during inland transport and ocean freight?

We use export-oriented packing and loading methods based on the product type, including end protection, stable bundling or blocking, waterproof wrapping where needed, and careful loading control. The goal is to reduce rust, scratches, bevel damage, face damage, coating damage, thread damage, or handling impact during domestic transport and long sea shipment.

4. Is 3LPE coated steel pipe normally used for buried gas and underground water pipeline projects?

This product is commonly supplied for buried gas pipelines, crude oil lines, and underground water transmission, with buyer demand often tied to 3LPE coated steel pipe, DIN 30670, ISO 21809-1, and API 5L base pipe.