3PE anti-corrosion seamless steel pipe

Update time：2025-03-23

I.Why 3PE anti-corrosion technology has become the industry benchmark?

3PE anti-corrosion seamless steel pipe has become the material of choice for pipeline projects worldwide due to its unique composite structure design.

This kind of pipe takes seamless steel pipe as the base material and realizes multiple protection through three layers of anti-corrosion coating (epoxy powder, adhesive and polyethylene), which perfectly balances the mechanical strength and corrosion resistance.

Analysis of the structure of the anti-corrosion layer:

First layer: 100 microns or more epoxy powder coating (FBE), forming a dense chemical barrier.

Second layer: 170-250 micron adhesive (AD), to realize the molecular level bonding between the coatings.

Third layer: 2.5-3.7 mm polyethylene (PE) for physical impact protection.

This “sandwich” structure makes the anticorrosive layer form a permanent bond with the steel pipe, and the laboratory accelerated aging test verified that its protective effect is 3-5 times that of the traditional single-layer anticorrosion.

II.3PE strengthened anti-corrosion steel pipe eight core advantages analysis

(1) 50+ years service life guarantee

Adopting high molecular weight polyethylene (HDPE) material, the molecular weight can be more than 500,000

Under standard working pressure (≤2.5MPa) and temperature (-30℃ to 70℃), the accelerated aging test data show that the annual degradation rate of the material is <0.03%, and the theoretical service life is 70 years.

(2) All-round chemical protection

Through the ASTM G17 standard test, can resist:

H2S in gas (concentration ≤ 500ppm)

Acid in oil (pH 2-11)

Chlorine ions in soil (≤20,000mg/L)

Microbial corrosion (SRB colonies ≤ 10^5 CFU/g)

(3) Engineering adaptability breakthrough

The characteristic of elongation at break ≥500%, together with 2.5D bending radius capability, is especially suitable for the construction of complex terrain. In the Alaska oil pipeline project, it has successfully realized the continuous 15-kilometer mountain pipeline laying without joints.

(4) Extreme environmental stability

Passed MIL-STD-810G military standard test:

Low temperature resistance: -60℃ impact test without cracks

High temperature resistance: short-term temperature resistance up to 110 ℃

Seismic: can withstand 7 earthquake intensity

(5) Environmental protection double certification

Obtained NSF/ANSI 61 Drinking Water System Certification and EPD Environmental Product Declaration. VOC emissions <5g/m² during production, and 100% recyclable characteristics reduce its carbon footprint by 42% compared to conventional steel pipe.

(6) Intrinsically Safe Design

The latest flame retardant and anti-static models are FM certified:

Surface resistance ≤1×10^6Ω

Oxygen index ≥ 30

UL94 V-0 grade flame retardant

(7) Revolutionary connection technology

Adopting AWS D10.12 standard hot melt connection process, the joint strength reaches more than 95% of the parent material. The welding speed of automatic welding machine can reach 15cm/min, which is 300% higher than the traditional welding efficiency.

(8) Full life cycle cost advantage

The weight is only 12.5% of carbon steel pipe, and the transportation cost is reduced by 40%. Installation efficiency is increased by 60%, and comprehensive maintenance costs are reduced by 75%.

III.Global standard certification system

(1) 3PE anti-corrosion steel pipe meets the requirements of multi-national standards:

China: SY/T0413-2002 (wall thickness tolerance ±1.5%)

International: ISO 21809-1:2011

EU: DIN 30670-2012

North America: CSA Z245.21-18

(2) Comparison of key indicators:

Standard	Peel Strength (N/cm)	Impact Strength (J/mm)	Cathodic Disbondment (mm)
DIN 30670	≥70	≥8	≤15
CSA Z245.21	≥75	≥10	≤12
SY/T0413	≥60	≥6	≤20

IV. 3PE anticorrosion steel pipe application scene

(1) Energy transportation

Shale gas gathering pipeline (working pressure 8-12MPa)

Submarine oil and gas pipeline (300m water pressure)

LNG low-temperature transportation (-162 ℃ working conditions)

(2) Municipal construction

Smart City Comprehensive Pipeline Corridor

Recycled water transportation system

Ground source heat pump pipe network

(3) Industrial field

Hazardous chemical transportation in chemical parks

Mine Tailings Discharge System

Food-grade CO2 transmission pipeline

(4) Agricultural Innovation

Precision irrigation system

Biogas Pipeline Network

Mariculture Transmission Pipeline

V.Intelligent Production Line Revealed

Modern 3PE production line adopts Industry 4.0 technology:

(1) Pretreatment section:

Laser descaling (Sa2.5 level cleanliness)

Infrared preheating (±3℃ temperature control precision)

(2) Spraying system:

Electrostatic powder coating (powder coating rate ≥95%)

Co-extrusion die head coating (thickness deviation ±0.2mm)

(3) Quality Inspection:

On-line EDM detection (9kV/mm)

Automatic thickness measurement (laser scanning accuracy 0.01mm)

Digital twin system (real-time process optimization)

The production line can realize Φ89-3020mm pipe diameter coverage, production speed up to 12m/min, pass rate 99.98%, annual production capacity exceeds 5000km.