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Products & Solutions
Oil & Gas Transmission Pipelines
Oil & Gas Transmission Pipelines
Oil & Gas Transmission Pipelines
1) Overview
Steel line pipes are critical for long-distance oil & gas transportation, connecting fields to refineries, terminals, and city networks. Requirements:
• High strength & toughness for pressure and distance
• Crack arrest capability
• Excellent low-temperature and subsea performance
• Corrosion resistance against H₂S, CO₂, chlorides, seawater
• Good weldability for on-site installation
2) Major International Standards
• API 5L: PSL1/PSL2 (Gr.B, X42–X120)
• ASTM: A106, A53, A335, A333, A312, B444, B622
• ASME: B31.4/B31.8, B16.5/B16.9/B16.11
• ISO 3183
• EN 10208 / EN 10216 / EN 10224
• GB/T 9711
• CSA Z245
• DNV-ST-F101
3) Grades
Carbon Steel Pipes
• Standard: API 5L Gr.B/X42–X80
• Size: OD ½” – 56”, WT 3–40 mm
• Application: crude oil & gas pipelines
Low Alloy Steel Pipes
• Standard: ASTM A335 P11/P22/P91
• Size: OD ½” – 36”, WT 3–30 mm
• Application: high temperature & pressure, sour service
Stainless Steel Pipes
• Standard: ASTM A312 TP304/316/321/347
• Size: OD ½” – 24”, WT 1.5–20 mm
• Application: acidic crude, chloride-rich fluids
Low Temperature Steel Pipes
• Standard: ASTM A333 Gr.6, 9%Ni
• Size: OD ½” – 24”, WT 2–20 mm
• Application: LNG, cryogenic pipelines
Duplex Stainless Steel Pipes
• Standard: UNS S31803/S32205 (2205), S32750 (2507)
• Size: OD ½” – 24”, WT 2–20 mm
• Application: seawater cooling, chloride stress service
Nickel-Based Alloy Pipes
• Standard: ASTM B444, B622, B407
• Size: OD ½” – 12”, WT 1.5–12 mm
• Application: sour service, CO₂/H₂S environments, subsea, reformers
Clad & Lined Pipes
• Type:
• Clad: carbon steel outer + alloy inner layer (explosion bonded/rolled)
• Lined: carbon steel with mechanically fitted alloy liner
• Standard: API 5LD, ASTM A264/A265/A666
• Size: OD 4” – 56”, WT 6–50 mm
• Application: sour oilfields, deepwater, supercritical CO₂, harsh chemical fluids
4) Dimensions
• Pipes: OD ½” – 56”, WT 3–40 mm, Length 6–18 m
• Fittings: DN15 – DN1200, Sch10 – Sch160
• Flanges: DN15 – DN2000, Class 150 – 2500
• Plates: 6–80 mm thick, ≤ 4200 mm wide, ≤ 18000 mm long
5) Manufacturing & Properties
• Process: BOF/EAF → CC → TMCP → LSAW/SSAW/Seamless → Heat treatment
• Surface protection: 3PE, FBE, epoxy, bitumen coatings
• Properties:
• Yield strength 245–690 MPa
• Impact toughness at -20℃ to -60℃
• Resistance to hydrogen embrittlement & SSC
• Nickel alloys & clad pipes for extreme corrosion & high temperature
6) Applications
• Cross-country transmission pipelines (West-East Gas Pipeline, China-Russia, NA pipelines)
• City gas & oil networks
• Offshore/deepwater pipelines
• LNG storage & cryogenic pipelines
• Sour & corrosive oilfields
• Refinery piping, steam reformers, cracking furnaces
• Supercritical CO₂ transport lines
7) Quality & Testing
• Chemical analysis (C, Mn, Cr, Ni, Mo, Nb)
• Mechanical tests (yield, tensile, impact)
• DWTT (Drop Weight Tear Test)
• NDT: UT, RT, MT, PT
• Hydrostatic test: 100%
• Certifications: API, ISO, EN, CSA, DNV, SGS, BV, LR
8) Supply & Packaging
• Supply forms: LSAW, SSAW, Seamless, Alloy, Clad & Lined Pipes, Plates
• Coatings: bare, oiled, 3PE, FBE, bitumen
• Packaging: bulk, strapped, wooden cases, export racks
• Documents: MTC (EN 10204 3.1/3.2), API 5L PSL2, ISO 3183, API 5LD
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