3LPE Coating Anti-Corrosion SSAW Steel Pipe

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3LPE Coating Anti-Corrosion SSAW Steel Pipe

Product Introduction

3LPE (Three-Layer Polyethylene) coating is one of the most effective anti-corrosion systems for steel pipes, providing excellent protection in harsh environments. When applied to SSAW (Spiral Submerged Arc Welded) steel pipes, the 3LPE coating ensures enhanced durability and longevity, making these pipes ideal for various applications, including oil and gas transportation, water pipelines, and infrastructure projects.

Characteristics of 3LPE Coating

  1. Corrosion Resistance: Provides outstanding protection against corrosion, chemical exposure, and environmental factors.
  2. Durability: Highly resistant to impact and abrasion, ensuring long-term performance.
  3. Flexibility: Adapts to the pipe’s surface, maintaining integrity even under mechanical stress.
  4. Adhesion: Excellent adhesion to the steel substrate, preventing delamination and coating failure.
  5. UV Resistance: Resistant to ultraviolet (UV) radiation, making it suitable for above-ground and buried applications.

Structure of 3LPE Coating

The 3LPE coating consists of three layers:

  1. Layer 1 – Fusion Bonded Epoxy (FBE):
    • Function: Provides excellent adhesion to the steel surface and acts as the primary corrosion protection layer.
    • Thickness: Typically 100-200 microns.
  2. Layer 2 – Adhesive:
    • Function: Binds the epoxy layer to the outer polyethylene layer, enhancing the overall coating system’s integrity.
    • Thickness: Typically 200-300 microns.
  3. Layer 3 – Polyethylene (PE):
    • Function: Provides mechanical protection against physical damage and environmental factors.
    • Thickness: Typically 1.8-3.0 mm, depending on application requirements.

Advantages of 3LPE Coated SSAW Steel Pipe

  1. Enhanced Corrosion Protection: Superior resistance to corrosion in harsh environments, extending the pipe’s service life.
  2. Mechanical Strength: High impact and abrasion resistance, protecting the pipe during handling, installation, and operation.
  3. Thermal Stability: Maintains performance across a wide temperature range, suitable for various climates and conditions.
  4. Cost-Effective: Reduces maintenance and replacement costs due to its long-lasting protective properties.
  5. Versatility: Suitable for both underground and above-ground applications in various industries.

Application of 3LPE Coated SSAW Steel Pipe

  • Oil and Gas Pipelines: Used for transporting crude oil, natural gas, and refined products.
  • Water Pipelines: Ideal for potable water and wastewater transportation.
  • Infrastructure Projects: Utilized in construction projects requiring durable and corrosion-resistant piping systems.
  • Chemical and Petrochemical Plants: Suitable for transporting corrosive substances and chemicals.

Process Flow of 3LPE Coated SSAW Steel Pipe

  1. Pipe Manufacturing: SSAW pipes are produced by forming and welding steel coils into a spiral shape.
  2. Surface Preparation: The pipe surface is cleaned using abrasive blasting to achieve the required surface roughness and remove contaminants.
  3. Fusion Bonded Epoxy (FBE) Application: The first layer of epoxy is applied to the heated pipe surface.
  4. Adhesive Application: The adhesive layer is applied over the cured epoxy layer.
  5. Polyethylene Application: The outer polyethylene layer is extruded onto the adhesive layer, forming the final protective coating.
  6. Cooling and Inspection: The coated pipe is cooled and inspected to ensure the coating’s quality and uniformity.

Inspection and Testing

To ensure the quality and performance of 3LPE coated SSAW steel pipes, the following inspection and testing procedures are implemented:

  1. Visual Inspection: Examination of the coating for any visible defects or irregularities.
  2. Thickness Measurement: Verification of the coating thickness using appropriate measuring devices.
  3. Adhesion Testing: Ensuring the coating adheres properly to the steel substrate.
  4. Impact Resistance Testing: Assessing the coating’s ability to withstand mechanical impacts.
  5. Holiday Testing: Detecting any pinholes or discontinuities in the coating.
  6. Peel Test: Evaluating the cohesive strength of the coating layers.

Packaging and Delivery

Proper packaging and handling of 3LPE coated SSAW steel pipes are crucial to prevent damage during transportation and storage:

    1. Packaging:
      • Pipes are typically bundled and secured with steel strips.
      • Ends are capped to prevent contamination.
      • Protective measures are taken to prevent damage to the coating during handling and transportation.
    2. Marking:
      • Each pipe is marked with relevant details such as grade, size, heat number, and manufacturer’s name.
    3. Comprehensive documentation accompanies the shipment, including inspection and testing certificates, material test reports (MTR), and compliance certificates.

SSAW Steel Pipe(Spiral Submerged Arc Pipe)

Sizes:   Out diameter:219mm-3620mm

Wall thickness: 5mm-25.4mm

Length: 3m-48m

 

Standard and Classfication of SSAW Steel Pipe

Classfication Standard Main Products
Line Pipe API 5L PSL1/2 Line pipe
Casing API 5CT/    ISO 11960 PSL1 Steel pipe for use as casing or tubing for wells of petroleum and natural gas industries
Steel Pipe for Fluid Service ASTM A53 Black and hot-hipped galvanized welded and seamless steel pipe
BS EN10217-2 Welded steel tybes for pressure purposes – delivery technical conditions – part2: Electric welded non- alloy and alloy steel tubes with specified elevated temperature properties
BS EN10217-5 Welded steel tybes for pressure purposes – delivery technical conditions – part5: submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
Steel Pipe for Ordinary Structure ASTM A252 Welded and seamless steel pipe piles
BS EN10219-1 Cold formed welded structural hollow sections of non-alloy and fine grain steels – part1: Technical delivert conditions
BS EN10219-2 Cold formed welded structural hollow sections of non-alloy and fine grain steels – part2: tolerances dimmsions and sectional properties

Chemical Analysis and Mechanical Properties of SSAW Steel Pipe

 

Standard Grade Chemical Composition(max)% Mechanical Properties(min)
C Si Mn P S Tensile Strength(Mpa) Yield Strength(Mpa)
API 5CT h40 0.030 417 417
J55 0.030 517 517
K55 0.300 655 655
API 5L PSL1 A 0.22 0.90 0.030 0.030 335 335
B 0.26 1.20 0.030 0.030 415 415
X42 0.26 1.30 0.030 0.030 415 415
X46 0.26 1.40 0.030 0.030 435 435
X52 0.26 1.40 0.030 0.030 460 460
X56 0.26 1.40 0.030 0.030 490 490
X60 0.26 1.40 0.030 0.030 520 520
X65 0.26 1.45 0.030 0.030 535 535
X70 0.26 1.65 0.030 0.030 570 570
API 5L PSL2 B 0.22 0.45 1.20 0.025 0.015 415 415
X42 0.22 0.45 1.30 0.025 0.015 415 415
X46 0.22 0.45 1.40 0.025 0.015 435 435
X52 0.22 0.45 1.40 0.025 0.015 460 460
X56 0.22 0.45 1.40 0.025 0.015 490 490
X60 0.12 0.45 1.60 0.025 0.015 520 520
X65 0.12 0.45 1.60 0.025 0.015 535 535
X70 0.12 0.45 1.70 0.025 0.015 570 570
X80 0.12 0.45 1.85 0.025 0.015 625 625
ASTM A53 A 0.25 0.10 0.95 0.050 0.045 330 330
B 0.30 0.10 1.20 0.050 0.045 415 415
ASTM A252 1 0.050 345 345
2 0.050 414 414
3 0.050 455 455
EN10217-1 P195TR1 0.13 0.35 0.70 0.025 0.020 320 320
P195TR2 0.13 0.35 0.70 0.025 0.020 320 320
P235TR1 0.16 0.35 1.20 0.025 0.020 360 360
P235TR2 0.16 0.35 1.20 0.025 0.020 360 360
P265TR1 0.20 0.40 1.40 0.025 0.020 410 410
P265TR2 0.20 0.40 1.40 0.025 0.020 410 410
EN10217-2 P195GH 0.13 0.35 0.70 0.025 0.020 320 320
P235GH 0.16 0.35 1.20 0.025 0.020 360 360
P265GH 0.20 0.40 1.40 0.025 0.020 410 410
EN10217-5 P235GH 0.16 0.35 1.20 0.025 0.020 360 360
P265GH 0.20 0.40 1.40 0.025 0.020 410 410
EN10219-1 S235JRH 0.17 1.40 0.040 0.040 360 360
S275JOH 0.20 1.50 0.035 0.035 410 410
S275J2H 0.20 1.50 0.030 0.030 410 410
S355JOH 0.22 0.55 1.60 0.035 0.035 470 470
S355J2H 0.22 0.55 1.60 0.030 0.030 470 470
S355K2H 0.22 0.55 1.60 0.030 0.030 470 470
ABTER STEEL

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