Application description

Widely used in long-distance oil and gas transmission pipelines, natural gas distribution networks, water transportation, slurry lines, and pipe jacking projects. Also suitable for offshore pipelines, refinery process piping, and structural applications (tunnel supports, culverts). High strength and pressure resistance make it ideal for onshore and offshore energy infrastructure.

Production description

Steel plate or coil is formed into pipe shape (seamless: pierced billet; welded: rolled and welded). Pipe is heat treated (normalized/Q&T if required), sized, inspected (UT, hydrostatic), and end-finished (beveled or threaded). Coating (3PE/FBE) applied optionally.

Shipping Packaging

For export, line pipes are fitted with plastic end caps, bundled with steel straps, packed on ISPM-15 pallets or steel skids, and secured with edge protectors. Coated pipes receive additional moisture-proof wrapping. Labels include grade, dimensions, length, and heat number for safe sea freight.

Why Choose Us?

1.Factory Strength:Direct manufacturer with integrated seamless and welded (ERW, LSAW, SSAW) pipe production lines, heat treatment furnaces, and in-house coating facilities (3PE, FBE), producing API 5L grades Gr B to X80 with consistent quality.

2.Quality Assurance:Strict control of chemical composition, mechanical properties (yield/tensile), impact toughness, and NDT (100% UT, hydrostatic); compliant with API 5L PSL1/PSL2, ISO 3183, GB/T 9711.

3.Certifications & Reports:Mill test certificates (MTC) with each shipment; third-party inspections (SGS, BV, Intertek) and impact test reports (including low temperatures) available upon request.

4.Customization & Service:Wide grade range (Gr B, X42–X80), diameters 10.3–3048mm, wall 1.5–60mm, custom lengths (6–18m), end finishes (beveled, threaded), coatings (3PE, FBE, black varnish), and fast lead times.

5.Export Packaging:Plastic end caps + moisture-proof wrapping (for coated pipes) + steel strapping + ISPM-15 pallets/steel skids + edge protectors + clear labeling for safe sea freight and corrosion protection.

FAQ

1. How should line pipes be stored before installation to prevent corrosion and damage?

Store on dry, level ground on wooden sleepers or steel skids, keep pipes elevated. Maintain original end caps and moisture-proof wrapping for coated pipes. For long-term outdoor storage, apply rust preventive oil on non-coated ends. Avoid stacking heavy loads that could deform the pipe.

2. What is the difference between PSL1 and PSL2 in API 5L?

PSL1 has basic chemical and mechanical requirements, no impact testing required, suitable for non-critical low-pressure service. PSL2 has stricter chemistry limits, mandatory impact testing at specified temperatures, and stricter NDT (UT, RT) requirements, required for high-pressure, sour service, and low-temperature applications. Choose PSL2 for critical oil/gas transmission.

3. Can line pipes be welded in the field, and what precautions are needed?

Yes. Use qualified low-hydrogen welding procedures matching the pipe grade (GMAW, SMAW, GTAW). For higher grades (X70, X80), control heat input to prevent HAZ softening. Preheat as required by wall thickness and grade. For coated pipes, remove coating 100-150mm from weld area and repair after welding with compatible coating.