Liner Pipe

Our API 5L Liner Pipe (also known as Line Pipe) is a high-reliability pressure-bearing pipeline specially designed for oil, gas, water and fluid transmission engineering. Strictly manufactured in accordance with international standards such as API 5L, ASTM A106/A53 and ISO 3183, it has excellent pressure resistance, corrosion resistance and impact resistance, and can adapt to complex transmission scenarios such as onshore, offshore, and sour service working conditions. We provide stable pipeline solutions for global oil and gas exploitation, municipal pipe network, chemical engineering and other fields, with full size coverage, customizable processing and full-process traceable quality control.

1. Full Standard Compliance for Global Project Access : Our Liner Pipe has passed the official API 5L certification, strictly implements the two quality levels of PSL1/PSL2, and is compatible with mainstream standards in many countries such as ASTM, ISO, and EN. It can meet the access requirements of oil and gas engineering and municipal projects in North America, the Middle East, Europe, Southeast Asia, South America and other regions around the world, without additional adaptation adjustments.

2. Full Steel Grade & Size Coverage with Strong Customization Capability : From conventional carbon steel GR.B to high-strength line pipe steel X80, the outer diameter covers 21.3mm-1524mm, the wall thickness ranges from 2mm to 60mm, and seamless/welded full processes are optional. According to the pressure, temperature and medium working conditions of the project, we can provide exclusive material selection and customized processing solutions, which can be perfectly adapted to both small-diameter wellhead pipelines and large-diameter long-distance transmission trunk lines.

3. Adapt to Harsh Working Conditions with Longer Service Life : For the most severe sour service conditions (H2S/CO2 environment) in the oil and gas industry, we adopt ultra-pure steelmaking process, strictly control the content of harmful elements such as S and P, and cooperate with precise quenching and tempering heat treatment. The product has passed the HIC/SSCC corrosion test of NACE standard, and has excellent hydrogen induced cracking resistance and sulfide stress corrosion cracking resistance. At the same time, it can adapt to -45℃ alpine low temperature working conditions, and the low temperature impact performance meets the standard. It can maintain stable structural strength even in extreme environments, greatly extending the service life of the pipeline and reducing operation and maintenance costs.

4. Full Process Traceability with Zero Quality Hidden Danger : Starting from raw material procurement, each batch of steel billet has an exclusive heat number and material report. The whole production process of pipe rolling, heat treatment, anti-corrosion and testing has digital records. Each finished pipe has a unique traceability code, realizing full life cycle traceability from steelmaking to delivery. We have established a three-level quality inspection system: team self-inspection, workshop re-inspection, and final inspection by the quality inspection department to ensure that 100% of the factory products meet the standard requirements and zero non-conforming products flow out.

- Core System Certifications: API 5L Official Certification, ISO 9001 Quality Management System, ISO 14001 Environmental Management System, ISO 45001 Occupational Health and Safety Management System

- Product Compliance Certifications: PED CE Certification (EU Pressure Equipment Directive), NACE MR0175 Sour Service Certification, ABS/DNV Classification Society Certification (Offshore Pipelines)

- Third-Party Inspection Support: We can cooperate with the world's mainstream third-party inspection institutions such as SGS, BV, TUV, Intertek for full-process supervision, factory inspection, container loading supervision, and provide authoritative inspection reports.

- Oil and Gas Upstream Exploitation : Wellhead Christmas tree connecting pipelines, downhole gathering and transmission pipelines, internal gathering and transmission pipe networks in oil and gas fields, adapting to high pressure and sour oil and gas field working conditions
- Long-distance Oil and Gas Transmission Engineering : Onshore oil and gas long-distance transmission trunk lines, subsea oil and gas transmission pipelines, covering full steel grades from X42 to X80, meeting the requirements of large-diameter and high-pressure long-distance transmission
- Urban Public Utilities : Urban gas transmission and distribution pipe networks, municipal water supply and drainage pipelines, thermal heating pipelines, with excellent seismic performance and long-term operation stability
- Chemical and Power Industry : Acid and alkali medium transmission in chemical plants, steam pipelines, power plant circulating water pipelines, ash removal and slag discharge pipelines, customizable anti-corrosion solutions to adapt to different chemical media
- Mining and Infrastructure Engineering : Slurry and tailings transmission pipelines, water supply and drainage for tunnel engineering, bridge pile foundation casings, water and oil transmission pipelines for port terminals, with excellent wear resistance and impact resistance

Q: What standards do your Liner Pipes comply with?

A: Our Liner Pipes are strictly manufactured in accordance with API 5L PSL1/PSL2, ISO 3183, ASTM A53, ASTM A106, BS EN 10208 and other international standards. We can also customize products that meet the NACE MR0175/ISO 15156 sour service standard according to customer project requirements.

Q: What is the minimum order quantity (MOQ) for Liner Pipe?

A: The MOQ for conventional specifications is 1 ton, and the MOQ for non-standard customized specifications is negotiated according to the production process and size. We support small batch trial orders to meet customer project testing and sample verification needs.

Q: Can you provide free samples of Liner Pipe?

A: Yes, we can provide free samples of conventional specifications (length ≤200mm), and the customer only needs to bear the international express freight. Non-standard customized samples need to charge corresponding production fees according to specifications, and the details can be communicated with our sales team.

Q: What is the difference between seamless and welded Liner Pipe?

A: The core difference lies in the process and applicable scenarios:

- Seamless Liner Pipe: Formed by hot rolling/cold drawing process, no weld seam, uniform overall structure, better pressure bearing capacity, impact resistance and corrosion resistance, suitable for harsh working conditions such as high pressure, high temperature, sour corrosion, flammable and explosive media

- Welded Liner Pipe (ERW/LSAW/SSAW): Formed by steel plate rolling and welding, with a wider diameter range, lower production cost and shorter delivery cycle, suitable for large-diameter, medium and low pressure, long-distance ordinary medium transmission pipelines, such as municipal gas, water supply and drainage, conventional oil and gas gathering and transmission.

Q: Can your Liner Pipe be used in sour service (H2S/CO2) environments?

A: Yes. For the working conditions of sour oil and gas fields, we can produce Liner Pipes that meet the NACE MR0175/ISO 15156 standard, with HIC (Hydrogen Induced Cracking) and SSCC (Sulfide Stress Corrosion Cracking) resistance. Through strict chemical composition control, heat treatment process and corrosion test, we ensure the long-term stable operation in sour environments.

Q: What inspection and testing do you perform on each Liner Pipe?

A: Each Liner Pipe delivered from the factory has undergone full-process testing, including: raw material chemical composition analysis, mechanical performance test (yield strength, tensile strength, elongation, impact test), hydrostatic test, non-destructive testing (UT/MT/PT/RT), dimensional accuracy inspection, surface quality inspection. We can provide a complete Material Test Certificate (MTC), and support full-process supervision and testing by third-party institutions such as SGS, BV, TUV.

Q: What customized processing services can you provide?

A: We provide full-process customized services, including: fixed length cutting, end bevel processing, thread processing, 3PE/FBE/coal tar epoxy anti-corrosion coating, hot dip galvanizing, PE/stainless steel lined anti-corrosion, non-standard parts processing according to drawings, fully matching your project design requirements.

Q: What payment terms do you accept?

A: We support flexible payment terms, including: T/T (30% advance payment, 70% against bill of lading copy), irrevocable L/C at sight, D/P, etc. For large long-term cooperation orders, customized payment terms can be negotiated.

Q: How do you ensure the quality of mass production is consistent with the samples?

A: We will lock the production process, material standards and inspection indicators of the confirmed samples before mass production. The same production line and quality inspection system are used for mass production, and the first article inspection is strictly implemented before batch production. We will regularly sample and test during the production process, and provide production progress reports and inspection data to customers in real time to ensure that the quality of mass production is completely consistent with the confirmed samples.

Q: What after-sales service do you provide?

A: We provide full-cycle after-sales guarantee:

- Pre-sales: Free technical consultation, material selection suggestions, sample support, quotation and loading plan optimization

- In-sales: Real-time update of production progress, provision of production and inspection reports, support for customer remote/on-site supervision

- After-sales: Full technical support after product delivery. If there is a product quality problem, we will respond within 24 hours, provide return and exchange, on-site technical guidance and other solutions to ensure the smooth progress of your project.

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