Q1: What does API 5L specify?
A1: API 5L defines technical requirements for seamless and welded line pipes. It covers grades (e.g., X42–X120), dimensions, testing, and markings. PSL1 (standard) and PSL2 (enhanced) are two product specification levels. Compliance ensures safety in oil/gas transport.
Q2: What is ISO 3183?
A2: ISO 3183 is an international line pipe standard aligned with API 5L. It includes additional requirements for sour service (H₂S resistance) and low-temperature toughness. Three categories (A, B, C) define inspection rigor.
Q3: What is DNV-ST-F101?
A3: DNV's standard for submarine pipelines covers design, materials, and testing. It addresses external pressure, buckling, and fatigue in offshore environments. Mandatory for North Sea and deep-water projects.
Q4: What is NACE MR0175?
A4: This standard by NACE International specifies materials resistant to sulfide stress cracking (SSC) in sour (H₂S-containing) environments. It applies to valves, pipes, and fittings.
Q5: What are ASME B31.4 and B31.8?
A5: B31.4 governs liquid hydrocarbon pipelines, while B31.8 covers gas pipelines. They define design, construction, and safety protocols. Compliance is legally required in the U.S.
