API 5L X80QS Oil And Gas Pipe Lines

X80QS is a high-strength seamless steel pipe designed specifically for acidic service environments under the API 5L PSL2 standard. "X80" represents a minimum yield strength of 555 MPa (80 klb/sq inch), and the "QS" suffix specifically indicates that it has passed corrosion resistance verification in acidic environments.

This material employs TMCP thermomechanical control process and microalloying technology to achieve breakthroughs in both hydrogen-induced cracking (HIC) and sulfide stress corrosion (SSC) resistance while ensuring a yield strength of over 555 MPa. This is achieved through strict control of sulfur and phosphorus impurity content and microstructure (acicular ferrite content ≥80%).

Master H2S challenges with our API 5L X80QS pipelines. Fully compliant with Annex H, our pipes undergo rigorous HIC and SSCC testing to ensure zero-failure performance in sour service. Request our technical test reports and Annex H compliance data now!

API 5L X80QS Line Pipes for oil & gas Specification

X80QS Seamless Steel Pipe Standards:

• Core Standard: API SPEC 5L-2018 "Line Pipeline Steel Specification" 46th Edition, PSL2 Grade (Appendix H: Acid Service Requirements);
• Supplementary Corrosion Resistance Standards: NACE MR0175/ISO 15156 (Metallic Materials for Hydrogen Sulfide Environments);
• Testing Standards: API 1104 (Non-destructive Testing), NACE TM0284 (HIC Test), NACE TM0177 (SSC Test).

API 5L X80QS Pipeline Technical Specifications

API 5L PSL2 X80QS Seamless Steel Pipe Testing

Hydrogen-Induced Cracking (HIC) Test: According to NACE TM0284 standard, immerse in solution A (pH 3.5) for 96 hours, requiring a crack rate (CLR ≤ 10%, CTR ≤ 1.5%, CSR ≤ 0.5%);

Sulfide Stress Corrosion (SSC) Test: According to NACE TM0177 standard, apply 80% yield strength stress under an H₂S partial pressure of 0.1 MPa for 720 hours without fracture;

Hydrostatic Pressure Test: Test pressure ≥ 1.5 times the design pressure, pressure holding ≥ 5 seconds, no leakage;

Metallographic Inspection: Requires non-metallic inclusions ≤ 2.0 grade, grain size ≥ 8 grade, avoiding corrosion sources.

API 5L X80QS Line Pipes for oil & gas Specialized Logistics for Sour Service Pipelines

1. Extremely Rigorous Surface Integrity Protection

In acidic environments, any mechanical damage exceeding 5% of the pipe wall thickness (such as scratches caused by steel wire ropes) is strictly unacceptable.

• Nylon Slings Only: We strictly prohibit the use of steel wire ropes during all in-plant and port handling operations. Only nylon slings equipped with flexible padding or specialized vacuum lifting devices are permitted.
• Rubber-Padded Saddles: When loaded onto trucks or stowed within ship holds, pipes are never allowed to come into direct contact with metal surfaces; instead, they are seated in curved wooden saddles fitted with protective rubber liners to prevent vibration-induced abrasion during transit.

2. Multi-Layered Protection for Beveled Ends and Pipe Terminals (Precision Pipe End Protection)

The high-strength specifications of X80QS pipes demand flawless alignment during field welding operations.

• Heavy-Duty Steel End Protectors: Unlike standard pipes, which typically utilize simple plastic caps, we equip X80QS pipes with bolted-on steel end protectors. These robust guards are capable of withstanding lateral compressive forces of tens of tons during handling operations, thereby ensuring that the pipe's beveled ends remain completely free of deformation.
• Internal Sealing and Desiccation: The pipe ends are sealed with watertight caps, and desiccant packets are placed inside the pipe bore to prevent internal pitting corrosion caused by the high-salinity marine atmosphere encountered during sea transport.

3. Meticulous Loading Procedures for 3LPE/3LPP Coatings (Coating Protection)

X80QS pipes are typically protected by a three-layer polyethylene (3LPE) anti-corrosion coating; safeguarding this coating is paramount to safeguarding the steel pipe itself.

• Separator Planks: When pipes are stacked in multiple layers, soft plastic or wooden separator planks are inserted between each layer to prevent direct contact and collision between pipes, thereby eliminating the risk of coating damage or detachment (which would result in a "Holiday Detection Failure").
• Sea-Fastening and Securing: Non-metallic tensioning straps are utilized to secure the cargo, and anti-abrasion sleeves are installed at all contact points to prevent chafing.

4. Fully Traceable Digital Identification and Marking (Digital Traceability & Marking)

• In large-scale oil and gas projects, misidentifying a pipe-specifically, using a non-acid-resistant pipe in an acid-prone zone-can lead to catastrophic consequences. Weather-Resistant QR Code Labels: The labels remain clearly legible even after 60 days of sea transport. By scanning the QR code, customers can directly access the HIC test report and MTC for that specific pipe online.
• Hard Stamping Verification: A clear "API 5L X80QS PSL2" stamp is applied to the pipe end, ensuring unique identification.

GNEE API 5L Pipeline for oil and gas product list

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