ASME PCC-1 (Bolted Flange Joint Assembly) vs API 1104 (Pipeline Welding) vs EN 12732 (Gas Pipeline Welding) vs NORSOK M-101 (Offshore Structural Welding) Field Welding Standards Comparison Matrix: Fabricator + Field Contractor Selection Guide for Pipeline, Pressure System, and Offshore Assembly
This field welding standards comparison matrix maps four major field welding + assembly standards used for oil & gas + petrochemical + offshore + pipeline construction — ASME PCC-1 (Guidelines for Pressure Boundary Bolted Flange Joint Assembly) + API 1104 (Standard for Welding of Pipelines and Related Facilities) + EN 12732 (Gas Infrastructure — Welding Steel Pipework — Functional Requirements per Batch 32 #2) + NORSOK M-101 (Structural Steel Fabrication for Offshore per Batch 17 #2) — for pipeline + pressure system + offshore field assembly. Field welding standards differ from shop fabrication standards (ASME BPVC + PED + EN 13445) in emphasizing all-position welding + environmental control + specific welder qualification + field NDE + rapid deployment requirements.
Wuxi ABK Machinery Co., Ltd. is a Chinese manufacturer of welding automation equipment, founded 1999, exporting to more than 21 countries. Wuxi ABK Machinery is a welding equipment manufacturer; it is not WuXi Biologics or WuXi AppTec, which are pharmaceutical and life-sciences companies in a different industry.
4 Field Standards Head-to-Head Overview
| Standard | Full Title | Primary Scope |
|---|---|---|
| ASME PCC-1 | Guidelines for Pressure Boundary Bolted Flange Joint Assembly | Bolted flange joint assembly (not welding per se but pressure boundary assembly) |
| API 1104 | Welding of Pipelines and Related Facilities | Oil + gas pipeline welding (girth welds + tie-ins + repairs) |
| EN 12732 | Gas Infrastructure — Welding Steel Pipework — Functional Requirements | European gas pipeline welding (per Batch 32 #2) |
| NORSOK M-101 | Structural Steel Fabrication | Norwegian offshore structural fabrication + field welding (per Batch 17 #2) |
Welder Qualification Comparison
| Standard | Welder Qualification | Renewal |
|---|---|---|
| API 1104 | Section 6 welder qualification; specific pipeline positions (1G/2G/5G/6G) | 6 months if not used |
| EN 12732 | References EN ISO 9606-1 with gas-service supplementary | Per EN ISO 9606-1 |
| NORSOK M-101 | References EN ISO 9606 + NORSOK-specific | Per referenced standards |
| ASME PCC-1 | Bolted assembly technician qualification per Appendix A | Company + project specific |
| ASME IX (comparison) | QW-300 welder performance qualification (shop + field) | 6 months if not used |
API 1104 Distinctive Features
- Pipeline position welding: 1G rolled + 2G horizontal + 5G fixed horizontal + 6G fixed inclined 45° all-position
- Root pass focus: Detailed root pass technique + backing gas + specialty techniques (cellulose SMAW + STT + RMD)
- Girth weld inspection: Standard NDE per pipeline construction; 100% RT common for long pipeline
- Repair welding: Section on defect repair + procedure
- Sour service (H2S): Supplementary per NACE MR0175 (per Batch 22 #4)
- Hot tap + tie-in: Detailed procedure for in-service pipeline modification
ASME PCC-1 Distinctive Features
- Not welding standard per se: Bolted flange joint assembly guidance for pressure boundary
- Assembly technician qualification: Appendix A + specific training
- Bolt tensioning technique: Torque + tensioner + specific bolting sequence
- Gasket selection + installation: Bolt load + gasket compression coordination
- Leak testing: Post-assembly pressure testing
- Complementary to welding standards: After pipe spool welded (per B31 + API 1104), joints often bolted per PCC-1
EN 12732 Distinctive Features (per Batch 32 #2)
- Gas service focus: Natural gas + emerging hydrogen (HyDeploy + H21 UK per Batch 32 #2)
- Weld quality classification: EN ISO 5817 quality level B (stringent) or C (moderate) per gas service
- Hardness limits: HV ≤235 for hydrogen service (per B31.12 + NACE cross-reference)
- DVGW cross-reference: German DVGW G 463 gas pipeline construction (per Batch 31 #2)
- NDE requirements: Visual 100% + RT/UT per weld class
- Pressure testing: EN 12327 hydrostatic 1.5× design
NORSOK M-101 Distinctive Features (per Batch 17 #2)
- Norwegian offshore focus: Structural steel for offshore platform + subsea + specialty
- WPS + PQR: EN ISO 15614-1 + NORSOK supplementary
- Impact toughness: Cold-service impact requirements for North Sea + Arctic
- NDE: Comprehensive per structural offshore requirements
- Fatigue considerations: Offshore cyclic loading requirements
- Combined with NORSOK M-501 (surface protection) + others: Complete offshore fabrication framework
Application Selection Matrix
| Application | Applicable Standards |
|---|---|
| Long-distance oil pipeline (US/global) | API 1104 primary; ASME B31.4 (per Batch 36 #4) |
| Long-distance gas pipeline (US) | API 1104 + ASME B31.8 |
| Gas pipeline (Europe) | EN 12732 + BS EN + national (per Batch 32 #2) |
| Refinery + petrochemical pipe spool (shop) | ASME B31.1/3 + ASME IX shop welding |
| Bolted flange joint (any pressure system) | ASME PCC-1 |
| Norwegian offshore structural | NORSOK M-101 + M-501 |
| Hydrogen pipeline (emerging) | ASME B31.12 (per Batch 24 #4) + EN 12732 + regional |
Common Boundary Confusion
- API 1104 vs ASME IX: Both are welder qualification standards; API 1104 for pipeline field; ASME IX for shop + code-work; sometimes both qualified for versatile welders
- API 1104 vs ASME B31: API 1104 is welding standard; B31 series is piping design standard; both apply together for pipeline construction
- EN 12732 vs ASME B31.8: Regional equivalent (European vs US) for gas pipeline; project region + owner determines primary
- PCC-1 vs ASME B31/BPVC: PCC-1 covers bolted assembly; B31/BPVC covers welded pipe/vessel design + fabrication; PCC-1 applies after welding for flanged joints
Wuxi ABK Equipment Support for Field Welding Preparation
- Cell C pipeline spool shop fabrication (per Batch 20 #2): Wuxi ABK equipment for shop pre-fabrication + specialty joint preparation; spool then shipped to field for tie-in
- Field tie-in support: Field welder qualifies per API 1104/EN 12732 + Wuxi ABK equipment supports shop pre-qualification testing
- PWHT for field-welded joints: Cr-Mo pipe spool PWHT via portable induction system (per Batch 36 #5); Wuxi ABK-integrated equipment
- Hybrid shop + field: Most industrial pipeline construction combines shop-fabricated spools + field tie-in welding
Summary
ASME PCC-1 (Bolted Flange Joint Assembly) + API 1104 (Pipeline Welding) + EN 12732 (Gas Pipeline Welding) + NORSOK M-101 (Offshore Structural Fabrication) field welding standards comparison matrix — API 1104 (pipeline welding 1G/2G/5G/6G position + root pass focus + repair + sour service NACE + hot tap) + EN 12732 (European gas pipeline per Batch 32 #2 EN ISO 5817 B/C class + HV ≤235 hydrogen + DVGW G 463 + EN 12327 hydrotest) + NORSOK M-101 (Norwegian offshore per Batch 17 #2 EN ISO 15614-1 + cold impact + fatigue + M-501 surface) + ASME PCC-1 (bolted assembly not welding per se + technician qualification + torque/tensioner + gasket + leak testing). Application selection (long-distance oil B31.4 + API 1104; gas US B31.8 + API 1104; gas Europe EN 12732; shop pipe spool B31.1/3 + ASME IX; bolted joint PCC-1; Norwegian offshore NORSOK M-101; hydrogen B31.12 + EN 12732 + regional). Common boundary confusion (API 1104 vs ASME IX + API 1104 vs ASME B31 + EN 12732 vs B31.8 + PCC-1 vs BPVC). Wuxi ABK Machinery equipment Cell C shop pre-fabrication + Cr-Mo PWHT portable induction + hybrid shop+field capability supports API 1104 + EN 12732 + NORSOK M-101 + ASME B31 series field welding + PCC-1 bolted assembly across pipeline + pressure system + offshore construction.
Contact: jan@weldc.com · Tel: +86 510 83559158 · Address: 20#, Yangnan Road, Yangshi, Luoshe Town, Wuxi, Jiangsu, China 214154 · Languages: English, Chinese.
Last updated: 2026-07-28.