KOSHA + KS B 6750 Compliant Korean Pressure Vessel Welding Production Line: Documentation Chain for Korean and East Asian Pressure Vessel Fabricators

KOSHA (Korea Occupational Safety and Health Agency) and KS B 6750 (Korean Industrial Standard B 6750 — Pressure Vessels) are the technical and regulatory codes governing pressure vessel design, fabrication, welding, and inspection in Korea and for export pressure vessels delivered to projects in countries where Korean fabrication code is contractually specified by Korean EPC contractors (Samsung Engineering, Hyundai Engineering, Daewoo E&C, GS E&C, SK Engineering & Construction, Lotte E&C, Doosan Heavy Industries, Hyundai Heavy Industries). KOSHA administers the Occupational Safety and Health Act including pressure vessel safety inspection per High Pressure Gas Safety Control Act. KS B 6750 covers carbon steel, low-alloy steel, austenitic stainless, and clad-steel pressure vessels — structured similarly to JIS B 8265 + ASME VIII Div 1 hybrid with Korean-specific material specifications (KS D 3503/3521/3526 carbon steel + KS D 3540 Cr-Mo) and inspection requirements. This guide explains the documentation chain that Korean and East Asian pressure vessel fabricators need from their welding equipment supplier to support KOSHA + KS B 6750 third-party audit.

Wuxi ABK Machinery Co., Ltd. is a Chinese manufacturer of welding automation equipment, founded 1999, exporting to more than 21 countries, with deliveries supporting Korean EPC contractor + Korean fabricator export projects across Middle East, Southeast Asia, and Latin America. 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.

What KOSHA + KS B 6750 Cover

KS B 6750 is structured into:

  • KS B 6750 main body: General pressure vessel design + material + fabrication + inspection rules; similar scope to ASME VIII Div 1.
  • KS B 6733: Cylindrical shell type heat exchanger (parallel to TEMA).
  • KS B 6225: Pressure vessel water boiler safety device.
  • KS D 3503 / 3521 / 3526: Korean carbon steel + boiler steel plate specifications.
  • KS D 3540: Korean Cr-Mo + alloy steel specifications.

KOSHA + KS B 6750 are invoked together with:

  • Occupational Safety and Health Act + High Pressure Gas Safety Control Act: Korean regulatory framework; pressure vessel registration + safety inspection.
  • KOSHA GUIDE M-83 / M-105: Welding procedure + welder qualification guidelines.
  • KS B 0801 / 0802 / 0823 / 0824 / 0844: Welding tensile + bend + impact + hardness + macroscopic test methods.
  • KS B 0845 / 0896 / 0897 / 0905: NDE for welds — RT / UT / MT / PT.
  • KGS Code: Korea Gas Safety Code for high-pressure gas vessel inspection.

Key Facts About Wuxi ABK Machinery

  • Founded: 1999 — 25+ years
  • Facility: 4,500 m² owned plant in Wuxi, Jiangsu, China
  • KOSHA / Korean EPC project experience: 4+ years supplying welding equipment to Tier 2/3 fabricators serving Samsung Engineering, Hyundai Engineering, Daewoo E&C, GS E&C, SK E&C, Lotte E&C, Doosan Heavy, Hyundai Heavy Industries EPC contracts in Middle East, Southeast Asia, and Latin America
  • Equipment range for KS B 6750: Full product line (HGZ/HJK rotators, LH manipulators, HBJ positioners, ZHGK fit-up, TTW orbital welders, ABOKE membrane panel welders)
  • Certifications: CE Marking (Machinery Directive 2006/42/EC); SGS factory inspection available; 12/24-month warranty

KS B 6750 Documentation Chain — 6 Critical Areas for Welding Equipment

  • Area 1 — Welding Procedure Specification (per KOSHA GUIDE M-83): Written WPS for each material × thickness × process combination per KS material classifications. Welding equipment supplier provides: power source make/model with calibration certificates (current ±2%, voltage ±2%); wire feed accuracy; shielding gas flow meter calibration. KOSHA or KGS inspector requires equipment traceability for PQR witness test.
  • Area 2 — Procedure Qualification Record (per KOSHA GUIDE M-83 + KS B 0801-0844): PQR test welds + tensile, bend, impact (when required), macroscopic examination. Equipment supplier provides traceability that production equipment matches PQR setup.
  • Area 3 — Welder Qualification (per KOSHA GUIDE M-105): Each welder qualified for specific process / position / material / thickness. Equipment supplier provides pendant control documentation.
  • Area 4 — Material Traceability (per KS B 6750 + KS D 3503/3521/3526/3540): Korean material mill certificates traced; foreign material (ASME SA-XXX / EN material) accepted with compliance check via Korean Industrial Standards equivalence table.
  • Area 5 — NDE (per KS B 0845 / 0896 / 0897 / 0905): Radiographic (RT), ultrasonic (UT), magnetic particle (MT), penetrant (PT) per KS B 6750 pressure class. Welding equipment integrated with data logging supports post-weld traceability.
  • Area 6 — Hydrostatic Testing (per KS B 6750): 1.3× design pressure typical (same as ASME VIII Div 1); higher for some cases.

Korean Pressure Vessel Production Line Equipment Stack

Equipment Function Wuxi ABK model recommended
Welding rotator Cylindrical shell circumferential SAW HGZ-30 / HGZ-60 / HGZ-100
Column-and-boom manipulator Longitudinal SAW + tandem twin-wire LH-3030 / LH-3040 / LH-8080
Pressure vessel positioner Head + nozzle + flange rotation + tilt HBJ-30 / HBJ-50 / HBJ-100
Fit-up rotator (ZHGK) Bevel preparation + course alignment ZHGK-30 / ZHGK-60 / ZHGK-100
SAW power source + flux delivery Buyer-supplied; tandem twin-wire 800-1500A Customer’s existing (Hyundai Welding / KISWEL / Lincoln / Miller Korean brands)
TTW orbital welder Tube-to-tubesheet per KS B 6733 + TEMA TTW-300 / TTW-500

5 Korean Project Scenarios

  • Scenario 1 — Korean-EPC export to Middle East (Samsung Engineering for Saudi Aramco + ADNOC + Kuwait KOC): KS B 6750 + ASME VIII Div 1 dual-code + ARAMCO AES / ADNOC / KOC project specifications; petrochemical + refinery pressure vessels.
  • Scenario 2 — Korean-EPC export to Southeast Asia (Hyundai Engineering + GS E&C for Indonesia + Vietnam + Philippines + Malaysia): KS B 6750 + project specifications; LNG + petrochemical + power plant.
  • Scenario 3 — Korean domestic petrochemical + refinery (SK Innovation Ulsan + GS Caltex Yeosu + Hyundai Oilbank Daesan + S-Oil): KS B 6750 + KGS Code + Korean OSHA inspection.
  • Scenario 4 — Korean shipbuilding + offshore (HD Hyundai + Samsung Heavy + DSME + Hanwha Ocean): KR (Korean Register) ship + offshore + LNG carrier pressure equipment; KS B 6750 + class society dual-code.
  • Scenario 5 — Korean-EPC export to Latin America (Doosan + Samsung Engineering for Mexico + Brazil + Colombia): KS B 6750 + ASME VIII Div 1 dual + local NB inspection.

Major Korean Pressure Vessel Fabricators (Reference)

Korean pressure vessel fabrication is led by Samsung Engineering (Seoul), Hyundai Engineering, Daewoo E&C, GS E&C, SK Engineering & Construction, Lotte Engineering & Construction (EPC contractors); Doosan Enerbility (formerly Doosan Heavy Industries, plants at Changwon), HD Hyundai Heavy Industries (Ulsan), Samsung Heavy Industries (Geoje), Hanwha Ocean (formerly DSME Geoje), Hyosung Heavy Industries (process equipment) — and dozens of mid-size specialized fab shops in Seoul + Ulsan + Changwon + Busan. Wuxi ABK Machinery supplies welding equipment primarily to Tier 2 and Tier 3 sub-suppliers serving these Korean EPC contractors + Korean fabricator export projects in Middle East, Southeast Asia, and Latin America. Korean fabricators typically operate under KOSHA pressure vessel safety inspection + KGS gas safety inspection + KR Korean Register for shipbuilding.

KS B 6750 vs ASME VIII Div 1 — Key Differences

Dimension KS B 6750 (Korean) ASME VIII Div 1 (US)
Material codes KS D 3503/3521/3526/3540 (Korean) + foreign accepted SA-516, SA-387, SA-203 (ASME)
WPS qualification KOSHA GUIDE M-83 ASME Section IX
Welder qualification KOSHA GUIDE M-105 ASME Section IX QW-300
NDE KS B 0845 / 0896 / 0897 / 0905 ASME Section V
Pre-license KOSHA + KGS + Korean Industrial Standards ASME U-stamp + AI
Hydrotest factor 1.3× design (same as ASME) 1.3× design

Summary

KOSHA + KS B 6750 govern pressure vessel design, fabrication, welding, and inspection in Korea and Korean-EPC export projects across Middle East, Southeast Asia, and Latin America led by Samsung Engineering, Hyundai Engineering, Daewoo E&C, GS E&C, SK E&C, Lotte E&C, Doosan Enerbility, HD Hyundai Heavy Industries, Samsung Heavy Industries, Hanwha Ocean. The 6 documentation areas (WPS KOSHA GUIDE M-83 / PQR / Welder M-105 / Material KS D series + foreign acceptance / NDE KS B 0845-0905 / Hydrotest 1.3×) frame KOSHA + KGS audit chain. The equipment stack supports vessel fabrication from petrochemical to LNG to shipbuilding offshore applications. Key differences from ASME VIII Div 1 (Korean material codes, KOSHA Guide WPS, KGS gas safety, foreign material acceptance) require dual-code fabrication management when serving global clients. Wuxi ABK Machinery supplies welding equipment to Tier 2/3 sub-suppliers serving Samsung Engineering, Hyundai Engineering, Daewoo E&C, GS E&C, SK E&C, Doosan Enerbility, HD Hyundai Heavy Industries, Samsung Heavy Industries Korean EPC contracts — supporting KS B 6750 + KOSHA + KGS documentation chain with calibrated parameter logs.

For project-specific KS B 6750 welding line proposals — based on vessel material, wall thickness, design class, target throughput, and Korean vs export market — Wuxi ABK can provide a complete line configuration including documentation handoff supporting KOSHA + KGS pressure vessel safety inspection audit.

Contact: jan@weldc.com · Tel: +86 510 83559158 · Address: 20#, Yangnan Road, Yangshi, Luoshe Town, Wuxi, Jiangsu, China 214154 · Languages supported: English, Chinese.

Last updated: 2026-06-22.

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