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Differences between Seamless and Welded Pipes
Seamless steel pipe and welded pipe are commonly used in engineering projects. What are the differences between them? Cangzhou Shenlong is specially introduced here. it is obvious that seamless and w...
2023-12-18 15:02:25
Seamless steel pipe and welded pipe are commonly used in engineering projects. What are the differences between them? Cangzhou Shenlong is specially introduced here.
it is obvious that seamless and welded pipes differ in their manufacturing process. The other differences are listed in the below-attached table.
| Sr. No | Parameter | Seamless Pipe | Welded Pipe |
| 1 | Strength | Able to withstand more pressure and load as there is no weak seam. | Due to welding they are believed to withstand 20% less pressure and load as compared to seamless pipe. |
| 2 | Length | Relatively shorter in length due to manufacturing difficulties. | Can be manufactured in long continuous lengths. |
| 3 | Size | Manufactured for nominal size 24 inch or less. | No such size restriction on production. |
| 4 | Corrosion Resistance | Less prone to corrosion, means more corrosion resistant. | Weld areas are more prone to corrosion attacks, means less corrosion resistance. |
| 5 | Surface Quality | Rough due to extrusion process | Smooth high quality surface as compared to seamless pipe. |
| 6 | Economy | Costlier | More economic |
| 7 | Production Process | Complex, long procurement lead time | Simpler, short procurement lead time. |
| 8 | Tests | Seamless pipes does not require testing for weld integrity. | Must be tested before use. |
| 9 | Application | Suitable for high presure temperature and corrosive environment | Normally used for less corrosive and low pressure environment. |
| 10 | Availability | Less available, limited material types, longer delivery time | Readily available for various different materials; shorter delivery time |
| 11 | Wall Thickness | Inconsistent wall thickness across length, thicker so heavier | Wall thickness more consistent than seamless ones, thinner |
| 12 | Ovality | Better ovality, roundness | Poor ovality and roundness as compared to seamless counterpart. |
| 13 | Internal surface check | Checking not possible | Internal surface can be checked before manufacturing |
Pipe Selection, Welded or Seamless?
Even though improved manufacturing methods of recent times can produce welded pipes comparable to seamless pipes, still seamless pipes are preferred in a maximum of cases. However, for large-size piping applications (> 24-inch NPS) welded pipes are mostly preferred due to less cost. Along with cost, other parameters like diameter-to-thickness ratio, availability, corrosion resistance, etc. are considered for pipe selection.
Cangzhou Shenlong Pipe Manufacturing Co., Ltd. cooperates with Baosteel and Baogang to produce large-caliber seamless steel pipe, straight-seam welded pipe, spiral steel pipe, and pipe fittings. The products comply with API, ASTM, DIN, BS, and JIS standards, and can accept SGS, BV, and other inspections. The products are used in oil, natural gas, bridge, water conservancy, and other large-scale projects, which are worthy of trust.
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Cangzhou Shenlong Pipe Manufacturing Co., Ltd. is a company& supplier& manufacturer& factory specialized in the production, processing and sales of various steel pipes, such as seamless pipe, welded pipe, straight seam steel pipe, spiral welded steel pipe, hot galvanized steel pipe, coating steel pipe, stainless steel pipe, and pipe fittings, the production base is located in Cangzhou.
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