Seamless and Welded pipe are the most prominent comparison among different types of piping techniques. To differentiate Seamless and Welded pipe, many factors should take into accounts from Manufacturing process, Length and Size, Working Pressure and Corrosion Resistance, Material Availability and Lead Time until economy and testing.
Seamless Pipe VS Welded Pipe
1. Manufacturing Process
- Seamless pipe are derived from large piece of solid cylindrical steel, known as billet which is then heated and stretched until it forms into a hallow tube with desired dimensions.
- Welded Pipe are manufactured from a long-coiled strip, known as skelp which is then rolled by a bending machine until it formed into a tube with desired dimensions. Welding pipe available in a few types such as ERW, SSAW, LSAW, DSAW.
2. Length and size
- Due to the difficulties in manufacturing process, Seamless pipe is relatively shorter. Generally, Seamless pipe is produces in nominal sizes from 1/8” to 36”
- On the other way round, welded pipe does not have any length and size limitation. Hence, in terms of length and size availability, welded pipe is better.
3. Working Pressure and Corrosion Resistance
- “Seamless” pipe which named as no seam (crease) or welded joint found, caused a higher working pressure compared to welded pipe. Absent of seam allowed seamless pipe to resist more pressure and load. Hence, corrosion resistance is higher.
- Conversely, “Welded” pipe which consist of seam due to welding has 20% lower working pressure. Hence, resulting a lower corrosion resistance.
4. Material Availability and Lead Time
- The manufacturing of seamless pipe required limited high strength material such as stainless steel, copper, carbon steel, titanium, Monel, Hastelloy, etc. Limited Materials and complex production process caused a longer lead time.
On the contrary, manufacturing of welded pipe made by long coiled strip which available in various different material. Hence, shorter delivery and lead time required.
5. Economy and Testing
- Seamless pipe does not require weld integrity test. However, the complexity of manufacturing process had caused a high costing.
Conversely, welded pipe is more economic. It must be tested before use to build a piping system.
Product Tags
Steel Pipe Seamless pipes Welded pipes Industrial pipes Construction pipes Plumbing pipes Galvanized pipes Black steel pipes Stainless steel pipes Carbon steel pipes Corrosion-resistant pipes High-pressure pipes Low-pressure pipes Hydraulic pipes Gas pipes Oil pipes Water pipes Structural pipes Spiral pipes ERW Pipes Electric Resistance Welding pipes LSAW Pipes Longitudinal Submerged Arc Welding pipes SSAW pipes Spiral Submerged Arc Welding pipes API pipes American Petroleum Institute pipes ASTM pipes American Society for Testing and Materials pipes ASME pipes American Society of Mechanical Engineers pipes ANSI pipes American National Standards Institute pipes ISO pipes International Organization for Standardization pipes 1/4″ pipes 3/8″ pipes 1/2″ pipes 3/4″ pipes 1″ pipes 1-1/4″ pipes 1-1/2″ pipes 2″ pipes 2-1/2″ pipes 3″ pipes 3-1/2″ pipes 4″ pipes 5″ pipes 6″ pipes 8″ pipes 10″ pipes 12″ pipes 14″ pipes 16″ pipes 18″ pipes 20″ pipes 22″ pipes 24″ pipes 26″ pipes 28″ pipes 30″ pipes 32″ pipes 34″ pipes 36″ pipes 38″ pipes 40″ pipes 42″ pipes 44″ pipes 46″ pipes 48″ pipes SCH 10 pipes SCH 20 pipes SCH 30 pipes SCH 40 pipes SCH 60 pipes SCH 80 pipes SCH 100 pipes SCH 120 pipes SCH 140 pipes SCH 160 pipes SCH STD pipes SCH XS pipes SCH XXS pipes SCH 10s pipes SCH 40s pipes SCH 80s pipes ANSI B36.10 pipes ANSI B36.19 pipes ASTM SA pipes A106 Gr A pipes A106 Gr B pipes A106 Gr C pipes API 5L X42 pipes API 5L X46 pipes API 5L X52 pipes
Welded Line Pipe | |
Thickness | 1/8" (6mm), 1/4" (8mm), 3/8" (10mm), 1/2" (15mm), 3/4" (20mm), 1" (25mm), 1-1/4" (32mm), 1-1/2" (40mm), 2" (50mm), 2-1/2" (65mm), 3" (80mm), 3-1/2" (90mm), 4" (100mm), 5" (125mm), 6" (150mm), 8" (200mm) |
Standard | API 5L, ASME/ANSI B36.10 |
NDT | API 5L Annex E (as per client requirement) |
Heat Treatment | As per request |
Coating | Internal and external coating available as per request |
Specification | |
Carbon Steel | API 5L Gr.B |
High Yield Carbon Steel | API 5L X42/ 46/ 52/ 60/ 65/ 70 - PSL1/2 |
Low Temp Carbon Steel | ASME/ASTM SA/A671 CC65 CL22 |
Stainless Steel | ASME/ASTM SA/A312 304/304L, 316/316L, 317/317L,321/321H,310 |
Duplex / Super Duplex | UNS S31803, S32205, S32750, S32760, S31254 |
Size Range | |
ERW | 2" (50mm), 2-1/2" (65mm), 3" (80mm), 3-1/2" (90mm), 4" (100mm), 5" (125mm), 6" (150mm), 8" (200mm), 10" (250mm), 12" (300mm), 14" (350mm), 16" (400mm), 18" (450mm) |
LSAW | 16" (400mm), 18" (450mm), 20" (500mm), 22" (550mm), 24" (600mm), 26" (650mm), 28 (700mm)", 30" (750mm), 32" (800mm), 34" (850mm), 36" (900mm), 38" (950mm), 40" (1000mm), 42" (1050mm), 44" (1100mm), 46" (1150mm), 48" (1200mm), 50" (1250mm), 52" (1300mm), 54" (1350mm), 56" (1400mm), 58" (1450mm), 60" (1500mm) |
Seamless Pipe | |
Size Range | 1/4" (8mm), 3/8" (10mm), 1/2" (15mm), 3/4" (20mm), 1" (25mm), 1-1/4" (32mm), 1-1/2" (40mm), 2" (50mm), 2-1/2" (65mm), 3" (80mm), 3-1/2" (90mm), 4" (100mm), 5" (125mm), 6" (150mm), 8" (200mm), 10" (250mm), 12" (300mm), 14" (350mm), 16" (400mm), 18" (450mm), 20" (500mm), 22" (550mm), 24" (600mm), 26" (650mm), 28 (700mm)", 30" (750mm), 32" (800mm), 34" (850mm), 36" (900mm), 38" (950mm), 40" (1000mm), 42" (1050mm), 44" (1100mm), 46" (1150mm), 48" (1200mm) |
Schedule | SCH 10, SCH 20, SCH 30, SCH 40, SCH 60, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160 SCH STD, SCH XS, SCH XXS, SCH 10s, SCH 40s, SCH 80s |
Standard | ASME/ANSI B36.10, B36.19 |
Specification | |
Carbon Steel | ASME/ASTM SA/A106 Gr A/ Gr B/ Gr C |
High Yield Carbon Steel | API 5L X42/ 46/ 52/ 60/ 65/ 70 - PSL1/ 2 |
Low Temp Carbon Steel | ASME/ASTM SA/A333 Grade 6 |
Chrome Moly | ASME/ASTM SA/A 335 Grade P5/ P11/ P22/ P91 |
Stainless Steel | ASME/ ASTM SA/A312 TP304/304L, 316/316L, 309, 309H, 310S, 310H, 317/317L, 321, 321H, 347, 347H, 904L |
Duplex/ Super Duplex | ASME/ASTM SA/A790 UNS S31803, S32205, S32750, S32760 |
Nickel Alloy | ASME/ASTM SB163, 168, 424, 443, 575 UNS N02200 (Nickel 200), UNS N02201 (Nickle 201) UNS N04400 (Monel 400), UNS N06600 (Inconel 600) UNS N06601 (Inconel 601), UNS N06625 (Inconel 625) UNS N08810 (Incoloy 800H), UNS N08811 (Incoloy 800HT) |
Remark | HIC, PED 2014/68/EU, NACE MR0175, NORSOK available |
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