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EFW / LSAW / SSAW

The optimal pipeline solution for large-diameter piping and extreme environments, realizing flawless procurement of large-diameter pipes ranging from large oil/gas pipelines to offshore structures and special chemical plants based on excellent welding quality and structural stability.

"Overwhelming scale, flawless welding quality without a single error."
In large-scale plants and long-distance pipeline projects, extra-large diameter pipes that exceed the production limits of SMLS (seamless pipes) are essential. RPS cooperates with mills equipped with world-class pipe-making and automatic welding facilities to supply high-quality welded pipes boasting strong pressure resistance and perfect welded seam integrity. We propose the most economical and safe manufacturing process tailored to the customer's engineering drawings (BOM) and required pressure.

Core Manufacturing Processes

⚡ EFW (Electric Fusion Welding

EFW is a method of forming a steel plate and then welding it using a filler metal.With extremely high reliability of the welded joint, it is mainly used in harsh environments of high temperature and high pressure, and is especially optimized for manufacturing thick-walled special alloy steel and stainless steel piping.

  • Main Application: High-pressure lines in petrochemical plants, refinery equipment, corrosive fluid transport pipes
📏 LSAW (Longitudinal Submerged Arc Welding)

A method where steel plates are pressed into U and O shapes (UOE forming) and then the seam is welded in a straight line (longitudinally). The short weld line lowers the probability of defects, and it allows for heavy-wall forming, making it a premium welded pipe mainly used for deep-sea pipelines or offshore structures.

  • Main Application: O&G main pipelines (API 5L), offshore structures, high-pressure gas lines
🌀 SSAW (Spiral Submerged Arc Welding)

This is a method of winding steel strips in a coil form into a spiral shape to form a tube and then welding it. With a single coil specification, various large-diameter pipes can be continuously and economically produced, boasting overwhelming cost-effectiveness for long-distance low-pressure water pipelines or civil engineering foundation works.

  • Main Application: Large-diameter water pipes, water treatment plants, civil/construction steel pipe piling
⚙️ Quality Assurance for Welded Seam
The core of welded steel pipes lies in the perfect integrity of the welded seam. RPS fully satisfies the demanding quality requirements (ITP) of clients.
  • ASTM A179 / A192 / A210: Carbon Steel Boiler &
    Heat Exchanger Tubes
  • ASTM A213: Ferritic and Austenitic Alloy Steel Boiler,
    Superheater, and Heat-Exchanger Tubes
    (Grade: T2, T5, T11, T22, T91, T92)
Carbon steel & stainless steel and alloy by roll bend, press bend(JCO, Knife)

Acc to API spec" 5L GrB up to X70, API spec" 2H, API spec" 2W, All ASTM standard, BS7191 and EN10225, plus client's specification
OD457mm(8")~OD3810mm(150"), THK up to 120mm, Length up to 13.2m

Product Name Executive Standard Specification (mm) Grade
Welded and Seamless Pipe for General Purposes ASTM A53 φ10.3 ~ 609.6 x 1.24 ~ 22.2 A, B
ERW Pipe for Conveying Liquid, Gas, or Vapor ASTM A135 φ21.3 ~ 762.0 x 2.11 ~ 12.7 A, B
ERW Carbon Steel Boiler Tubes ASTM A178 / A192 φ12.7 ~ 127.0 x 0.9 ~ 9.1 A, C, D
ERW Heat-Exchanger and Condenser Tubes ASTM A214 φ12.7 ~ 76.2 x 0.9 ~ 7.9 (Single Grade)
ERW Structural Tubing in Rounds and Shapes ASTM A500 Perimeter 35 ~ 1250 x 0.8 ~ 16.0 A, B, C
ERW Carbon and Alloy Mechanical Tubing ASTM A513 φ12.7 ~ 381.0 x 1.2 ~ 15.0 (Varies by Grade)
ERW Carbon Steel Water-Well Pipe ASTM A589 φ21.3 ~ 406.4 x 3.2 ~ 9.5 Type I, II, III, IV
ERW Casing and Tubing for Wells (OCTG) API 5CT φ26.67 ~ 508.0 x 3.18 ~ 16.13 H-40, J-55, K-55, N-80, L-80, P-110
ERW Line Pipe for Oil and Gas API 5L (ERW) φ21.3 ~ 609.6 x 2.11 ~ 22.2 Gr.B ~ X80
LSAW Line Pipe for Oil and Gas API 5L (LSAW) φ406.4 ~ 1625.6 x 6.0 ~ 65.0 Gr.B ~ X80
SSAW Line Pipe for Oil and Gas API 5L (SSAW) φ219.1 ~ 3048.0 x 5.0 ~ 25.4 Gr.B ~ X80
LSAW / SSAW Steel Pipe Piles ASTM A252 φ219.1 ~ 3048.0 x 5.0 ~ 25.4 (LSAW: WT up to 65.0) Grade 1, 2, 3
Product Name Executive Standard Specification (mm) Grade
ERW Carbon Steel Pipes for Ordinary Piping IS G 3452 φ10.5 ~ 508.0 x 2.0 ~ 11.1 SGP
ERW Carbon Steel Pipes for Pressure Service JIS G 3454 φ10.5 ~ 609.6 x 1.24 ~ 22.2 STPG 370, STPG 410
ERW Carbon Steel Boiler and Heat Exchanger Tubes JIS G 3461 φ12.7 ~ 127.0 x 0.9 ~ 9.1 STB 340, STB 410, STB 510
Seamless Carbon and Alloy Steel Pipe for Low-Temperature Service ASTM A333 φ10.3 ~ 609.6 x 1.24 ~ 59.54 Gr 1, Gr 6
ERW Carbon Steel Tubes for General Structure JIS G 3444 /
JIS G 3466		 Perimeter 35 ~ 1250 /
φ21.7 ~ 1016.0		 STK 400, STKR 400
ERW Carbon Steel Tubes for Machine Structure JIS G 3445 φ10.5 ~ 381.0 x 1.2 ~ 15.0 STKM 11A ~ 20A
ERW Coated Steel Pipes for Water Service JIS G 3443-1 φ89.1 ~ 508.0 x 4.2 ~ 12.7 STW 400
ERW Casing and Tubing for Wells (OCTG) API 5CT φ26.67 ~ 508.0 x 3.18 ~ 16.13 (글로벌 API 통용)
ERW Line Pipe for Oil and Gas API 5L (ERW) φ21.3 ~ 609.6 x 2.11 ~ 22.2 (글로벌 API 통용)
LSAW Line Pipe for Oil and Gas API 5L (LSAW) φ406.4 ~ 1625.6 x 6.0 ~ 65.0 (글로벌 API 통용)
SSAW Line Pipe for Oil and Gas API 5L (SSAW) φ219.1 ~ 3048.0 x 5.0 ~ 25.4 (글로벌 API 통용)
LSAW / SSAW Steel Pipe Piles JIS A 5525 φ318.5 ~ 2000.0 x 6.0 ~ 25.4
(LSAW: WT up to 65.0)		 SKK 400, SKK 490
Product Name Executive Standard Specification (mm) Grade
ERW Welded Steel Tubes for Pressure Purposes EN 10217-1 (DIN 1626) φ10.2 ~ 610.0 x 1.2 ~ 22.2 P195TR1, P235TR1, P265TR1
ERW Welded Tubes for Elevated Temperature EN 10217-2 φ10.2 ~ 114.3 x 1.2 ~ 10.0 P235GH, P265GH, 16Mo3
ERW Steel Tubes for Aqueous Liquids EN 10224 φ21.3 ~ 762.0 x 2.0 ~ 12.5 L235, L275, L355
ERW Structural Hollow Sections EN 10219-1 Perimeter 35 ~ 1250 / φ21.3 ~ 1016.0 S235JRH, S275J0H, S355J2H
ERW Tubes for Mechanical Engineering EN 10296-1 φ10.2 ~ 381.0 x 1.2 ~ 15.0 E235, E275, E355
ERW Casing and Tubing for Wells (OCTG) API 5CT φ26.67 ~ 508.0 x 3.18 ~ 16.13 (글로벌 API 통용)
ERW Line Pipe for Oil and Gas EN ISO 3183 (ERW) φ21.3 ~ 610.0 x 2.11 ~ 22.2 L245 ~ L555
LSAW Line Pipe for Oil and Gas EN ISO 3183 (LSAW) φ406.4 ~ 1626.0 x 6.0 ~ 65.0 L245 ~ L555
SSAW Line Pipe for Oil and Gas EN ISO 3183 (SSAW) φ219.1 ~ 3048.0 x 5.0 ~ 25.4 L245 ~ L555
LSAW / SSAW Steel Pipe Piles EN 10219-1 φ219.1 ~ 3048.0 x 5.0 ~ 25.4 (LSAW: WT up to 65.0) S235JRH, S355J0H, S355J2H
Product Name Executive Standard Specification (mm) Grade
ERW Screwed and Socketed Steel Tubes BS 1387 φ10.2 ~ 165.1 x 1.8 ~ 5.4 Light, Medium, Heavy
ERW Carbon Steel Pipes for Pressure Purposes BS 3601 φ10.2 ~ 610.0 x 1.24 ~ 22.2 320, 360, 430
ERW Steel Boiler and Superheater Tubes BS 3059-1 / BS 3059-2 φ12.7 ~ 127.0 x 0.9 ~ 9.1 320, 360, 440
ERW Steel Pipes for Water and Gas BS 534 φ21.3 ~ 762.0 x 2.0 ~ 12.5 (Project Specific)
ERW Tubes for Mechanical Engineering BS 6323-5 φ12.7 ~ 381.0 x 1.2 ~ 15.0 ERW 1, ERW 2, ERW 3
ERW Casing and Tubing for Wells (OCTG) API 5CT φ26.67 ~ 508.0 x 3.18 ~ 16.13 (글로벌 API 통용)
ERW Line Pipe for Oil and Gas API 5L (ERW) φ21.3 ~ 610.0 x 2.11 ~ 22.2 (글로벌 API 통용)
LSAW Line Pipe for Oil and Gas API 5L (LSAW) φ406.4 ~ 1626.0 x 6.0 ~ 65.0 (글로벌 API 통용)
SSAW Line Pipe for Oil and Gas API 5L (SSAW) φ219.1 ~ 3048.0 x 5.0 ~ 25.4 (글로벌 API 통용)
LSAW / SSAW Steel Pipes for Piling & Structures BS 4360 φ219.1 ~ 3048.0 x 5.0 ~ 25.4 (LSAW: WT up to 65.0) Grade 40A, 43A, 50B

🌍 Global Piping Standards Cross-Reference Table

Application ASTM / API EN/DN JIS BS
Carbon Steel Pipe for General Pressure Service A53 Gr.B EN 10216-1 P265TR1 (DIN 1629 St 44.0) JIS G 3454 STPG 370 BS 1387 / BS 3601 Gr. 430
Carbon Steel Pipe for High-Temperature Service A106 Gr.B EN 10216-2 P235GH (DIN 17175 St 35.8) JIS G 3456 STPT 370 BS 3602-1 Gr. 360
Line Pipe for Oil & Gas Transportation API 5L Gr.B EN 10216-2 P235GH (DIN 17175 St 35.8) (API 5L applied globally) (API 5L applied globally)
Alloy Steel Pipe for High-Temperature Service A335 P11 / P22 EN 10216-2 13CrMo4-5 (DIN 17175 13CrMo44) JIS G 3458 STPA 23 / 24 BS 3604 Gr. 620 / 622
Austenitic Stainless Steel Pipe for Corrosive Service A312 TP316L EN 10216-5 1.4404 (DIN 17458) JIS G 3459 SUS316LTP BS 3605 316S11
Carbon Steel Boiler and Heat Exchanger Tubes A179 / A192 EN 10216-2 P235GH (DIN 17175 St 35.8) JIS G 3461 STB 340 BS 3059-1 Gr. 320
Carbon / Alloy Steel Mechanical Tubing A519 1020 / 1026 EN 10297-1 E235 / E355 (DIN 1629 St 37.0) JIS G 3445 STKM 11A / 13A BS 6323-4

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