What is the difference between the erw and the seamless pipe?
As the name suggests, seamless pipes are made without any seams that are welded together. On the other hand, welded pipes have a seam that runs the length of the pipe. Each kind of pipe is made in a different way, and it also has a different pressure capacity, cost, and use.
The cost difference between seamless and erw pipes
Since making seamless pipes takes longer and involves more steps than making welded pipes, seamless pipes always cost more than welded pipes. Cold-formed sheets are used to make ERW pipes, which are then joined by high-frequency welding, which is a fairly simple process that costs a fraction of what seamless pipes do.
Why use seamless pipes instead of erw pipes?
Since making seamless pipes takes longer and involves more steps than making welded pipes, seamless pipes always cost more than welded pipes. Cold-formed sheets are used to make ERW pipes, which are then joined by high-frequency welding, which is a fairly simple process that costs a fraction of what seamless pipes do.
Why choose seamless pipe for the Oil & Gas sectors?
High-pressure jobs are best done with pipes that don’t have any seams. In the oil and gas industry, the flow of media through the system puts a strong force on the pipes, especially when the temperature is high. Because of this strong force and the rise in temperature, pipes are under a lot of stress. When it comes to seamless pipes, they can handle almost 20% more pressure, which makes them perfect for the oil and gas industry.
Seamless and erw pipe manufacturing process
Electric resistance welded pipe, or ERW pipe for short can be made by rolling a sheet of steel into a cylinder while it is still cold. After the steel has been cold-formed, an electric current is run between the two edges. The electric current heats the cold-formed steel sheet to a point where the edges are forced to move in the same direction and stick together. No welding filler material is needed for the bond to form during this welding process. A high-frequency ERW process is thought to be the most commercially viable way to get the best quality weld.
Seamless pipes are made in a longer and more difficult process than welded pipes. Heat and a few other steps are used in this process to make the final product. First, the raw steel is heated and poured into blocks. The raw steel alloy is shaped into a cylinder by these solid billets. After the raw steel pipe has been formed into a cylinder, it is rolled until it is stretched and hollowed. This new product has a center that is not a perfect circle. A bullet-shaped piercer point is pushed through the center of the billet while it is being rolled. This gives the hollow a more even surface and shape.
 How to Identify Stainless Steel Seamless Pipe or ERW?
There are many different ways to make pipes. But if the ASTM A53 standard is used to make the pipes, they are marked with stencils. If the stencil says “Type S,” the pipe is made without any seams. On the other hand, if the pipe has a stencil that says “Type E,” it means that it was made with an Electrical resist welded method. A UV test is another way to make sure that pipes have been welded. Under ultraviolet light, there would be a clear difference in the grain structure of the pipe at the weld zone. Even though there are treatments that can be done to the surface to make the weldless noticeable, it is still possible to use UV light to check for welds.
ERW Pipe Thickness Chart and Sizes
| DN | PIPE OUT DIAMETER (OD) | ERW PIPE THICKNESS CHART | |||||||||||||||
| A SERIES | B SERIES | SCH5S | SCH10S | SCH20S | LG | SCH20 | SCH30 | STD | SCH40 | SCH60 | XS | SCH80 | SCH100 | SCH120 | SCH140 | SCH180 | |
| 324050 | 42.448.360.3 | 384557 | 1.61.61.6 | 2.82.82.8 | 3.23.23.6 | — | –3.2 | — | — | 3.63.64.0 | — | — | 5.05.05.6 | — | — | — | 6.37.18.8 |
| 658090 | 76.188.9101.6 | 7689- | 2.02.02.0 | 3.03.03.0 | 3.64.04.0 | — | 4.54.54.5 | — | — | 5.05.65.6 | — | — | 7.18.08.0 | — | — | — | 10.011.012.5 |
| 100125150 | 114.3139.7168.3 | 108133159 | 2.02.92.9 | 3.03.43.4 | 4.05.05.0 | — | 5.05.05.6 | — | — | 5.96.37.1 | — | — | 8.810.011.0 | — | 11.012.514.2 | — | 14.216.017.5 |
| 200250300 | 219.1273.0323.9 | 219273325 | 2.93.64.0 | 4.04.04.5 | 6.36.36.3 | — | 6.36.36.3 | 7.18.08.8 | — | 8.08.810.0 | 10.012.514.2 | — | 12.516.017.5 | 16.017.522.2 | 17.522.225.0 | 20.025.028.0 | 22.228.032.0 |
| 350400450500550600 | 355.6406.4457.0508.0559610 | 377426478529-630 | 4.04.04.05.05.05.6 | 5.05.05.05.65.66.3 | — | 8.08.08.08.08.08.0 | 8.08.08.010.0– | 10.010.011.012.5– | 10.010.010.010.010.010.0 | 11.012.514.216.0-17.5 | 16.017.520.020.0– | 13.013.013.013.013.013.0 | 20.022.225.028.030.032.0 | 25.828.530.032.0– | 28.030.036.040.0– | 32.036.040.045.0– | 36.040.045.050.0– |
ASME B36.19 seamless pipe sizes
| NPS(DN) | ID | ODIN(MM) | WTIN(MM) | WEIGHTLB/FT(KG/M) |
| 1/8(6) | 5S | 0.405(10.3) | *1 | … |
| 1/8(6) | 10S | 0.405(10.3) | 0.049(1.24)*1 | 0.19(0.28) |
| 1/8(6) | 40S | 0.405(10.3) | 0.068(1.73) | 0.24(0.37) |
| 1/8(6) | 80S | 0.405(10.3) | 0.095(2.41) | 0.31(0.47) |
| 1/4(8) | 5S | 0.54(13.7) | *1 | … |
| 1/4(8) | 10S | 0.54(13.7) | 0.065(1.65)*1 | 0.33(0.49) |
| 1/4(8) | 40S | 0.54(13.7) | 0.088(2.24) | 0.43(0.63) |
| 1/4(8) | 80S | 0.54(13.7) | 0.119(3.02) | 0.54(0.8) |
| 3/8(10) | 5S | 0.675(17.1) | *1 | … |
| 3/8(10) | 10S | 0.675(17.1) | 0.065(1.65)*1 | 0.42(0.63) |
| 3/8(10) | 40S | 0.675(17.1) | 0.091(2.31) | 0.57(0.84) |
| 3/8(10) | 80S | 0.675(17.1) | 0.126(3.2) | 0.74(1.1) |
| 1/2(15) | 5S | 0.84(21.3) | 0.065(1.65)*1 | 0.54(0.8) |
| 1/2(15) | 10S | 0.84(21.3) | 0.083(2.11)*1 | 0.67(1.0) |
| 1/2(15) | 40S | 0.84(21.3) | 0.109(2.77) | 0.85(1.27) |
| 1/2(15) | 80S | 0.84(21.3) | 0.147(3.73) | 1.09(1.62) |
| 3/4(20) | 5S | 1.05(26.7) | 0.065(1.65)*1 | 0.68(1.02) |
| 3/4(20) | 10S | 1.05(26.7) | 0.083(2.11)*1 | 0.86(1.28) |
| 3/4(20) | 40S | 1.05(26.7) | 0.113(2.87) | 1.13(1.69) |
| 3/4(20) | 80S | 1.05(26.7) | 0.154(3.91) | 1.48(2.2) |
| 1(25) | 5S | 1.315(33.4) | 0.065(1.65)*1 | 0.87(1.29) |
| 1(25) | 10S | 1.315(33.4) | 0.109(2.77)*1 | 1.41(2.09) |
| 1(25) | 40S | 1.315(33.4) | 0.133(3.38) | 1.68(2.5) |
| 1(25) | 80S | 1.315(33.4) | 0.179(4.55) | 2.17(3.24) |
| 1¼(32) | 5S | 1.66(42.2) | 0.065(1.65)*1 | 1.11(1.65) |
| 1¼(32) | 10S | 1.66(42.2) | 0.109(2.77)*1 | 1.81(2.69) |
| 1¼(32) | 40S | 1.66(42.2) | 0.14(3.56) | 2.27(3.39) |
| 1¼(32) | 80S | 1.66(42.2) | 0.191(4.85) | 3.0(4.47) |
| 1½(40) | 5S | 1.9(48.3) | 0.065(1.65)*1 | 1.28(1.9) |
| 1½(40) | 10S | 1.9(48.3) | 0.109(2.77)*1 | 2.09(3.11) |
| 1½(40) | 40S | 1.9(48.3) | 0.145(3.68) | 2.72(4.05) |
| 1½(40) | 80S | 1.9(48.3) | 0.2(5.08) | 3.63(5.41) |
| 2(50) | 5S | 2.375(60.3) | 0.065(1.65)*1 | 1.61(2.39) |
| 2(50) | 10S | 2.375(60.3) | 0.109(2.77)*1 | 2.64(3.93) |
| 2(50) | 40S | 2.375(60.3) | 0.154(3.91) | 3.66(5.44) |
| 2(50) | 80S | 2.375(60.3) | 0.218(5.54) | 5.03(7.48) |
| 2½(65) | 5S | 2.875(73) | 0.083(2.11)*1 | 2.48(3.69) |
| 2½(65) | 10S | 2.875(73) | 0.12(3.05)*1 | 3.53(5.26) |
| 2½(65) | 40S | 2.875(73) | 0.203(5.16) | 5.8(8.63) |
| 2½(65) | 80S | 2.875(73) | 0.276(7.01) | 7.67(11.41) |
| 3(80) | 5S | 3.5(88.9) | 0.083(2.11)*1 | 3.03(4.52) |
| 3(80) | 10S | 3.5(88.9) | 0.12(3.05)*1 | 4.34(6.46) |
| 3(80) | 40S | 3.5(88.9) | 0.216(5.49) | 7.58(11.29) |
| 3(80) | 80S | 3.5(88.9) | 0.3(7.62) | 10.26(15.27) |
| 3½(90) | 5S | 4.0(101.6) | 0.083(2.11)*1 | 3.48(5.18) |
| 3½(90) | 10S | 4.0(101.6) | 0.12(3.05)*1 | 4.98(7.41) |
| 3½(90) | 40S | 4.0(101.6) | 0.226(5.74) | 9.12(13.57) |
| 3½(90) | 80S | 4.0(101.6) | 0.318(8.08) | 12.52(18.64) |
| 4(100) | 5S | 4.5(114.3) | 0.083(2.11)*1 | 3.92(5.84) |
| 4(100) | 10S | 4.5(114.3) | 0.12(3.05)*1 | 5.62(8.37) |
| 4(100) | 40S | 4.5(114.3) | 0.237(6.02) | 10.8(16.08) |
| 4(100) | 80S | 4.5(114.3) | 0.337(8.56) | 15.0(22.32) |
| 5(125) | 5S | 5.563(141.3) | 0.109(2.77)*1 | 6.36(9.46) |
| 5(125) | 10S | 5.563(141.3) | 0.134(3.4)*1 | 7.78(11.56) |
| 5(125) | 40S | 5.563(141.3) | 0.258(6.55) | 14.63(21.77) |
| 5(125) | 80S | 5.563(141.3) | 0.375(9.53) | 20.8(30.97) |
| 6(150) | 5S | 6.625(168.3) | 0.109(2.77)*1 | 7.59(11.31) |
| 6(150) | 10S | 6.625(168.3) | 0.134(3.4)*1 | 9.3(13.83) |
| 6(150) | 40S | 6.625(168.3) | 0.28(7.11) | 18.99(28.26) |
| 6(150) | 80S | 6.625(168.3) | 0.432(10.97) | 28.6(42.56) |
| 8(200) | 5S | 8.625(219.1) | 0.109(2.77)*1 | 9.92(14.78) |
| 8(200) | 10S | 8.625(219.1) | 0.148(3.76)*1 | 13.41(19.97) |
| 8(200) | 40S | 8.625(219.1) | 0.322(8.18) | 28.58(42.55) |
| 8(200) | 80S | 8.625(219.1) | 0.5(12.7) | 43.43(64.64) |
| 10(250) | 5S | 10.75(273) | 0.134(3.4)*1 | 15.21(22.61) |
| 10(250) | 10S | 10.75(273) | 0.165(4.19)*1 | 18.67(27.78) |
| 10(250) | 40S | 10.75(273) | 0.365(9.27) | 40.52(60.29) |
| 10(250) | 80S | 10.75(273) | 0.5(12.7)*2 | 54.79(81.53) |
| 12(300) | 5S | 12.75(323.8) | 0.156(3.96)*1 | 21.0(31.24) |
| 12(300) | 10S | 12.75(323.8) | 0.18(4.57)*1 | 24.19(35.98) |
| 12(300) | 40S | 12.75(323.8) | 0.375(9.53)*2 | 49.61(73.86) |
| 12(300) | 80S | 12.75(323.8) | 0.5(12.7)*2 | 65.48(97.44) |
| 14(350) | 5S | 14.0(355.6) | 0.156(3.96)*1 | 23.09(34.34) |
| 14(350) | 10S | 14.0(355.6) | 0.188(4.78)Notes(1),(2) | 27.76(41.36) |
| 14(350) | 40S | 14.0(355.6) | 0.375(9.53)*2 | 54.62(81.33) |
| 14(350) | 80S | 14.0(355.6) | 0.5(12.7)*2 | 72.16(107.4) |
| 16(400) | 5S | 16.0(406.4) | 0.165(4.19)*1 | 27.93(41.56) |
| 16(400) | 10S | 16.0(406.4) | 0.188(4.78)Notes(1),(2) | 31.78(47.34) |
| 16(400) | 40S | 16.0(406.4) | 0.375(9.53)*2 | 62.64(93.27) |
| 16(400) | 80S | 16.0(406.4) | 0.5(12.7)*2 | 82.85(123.31) |
| 18(450) | 5S | 18.0(457) | 0.165(4.19)*1 | 31.46(46.79) |
| 18(450) | 10S | 18.0(457) | 0.188(4.78)Notes(1),(2) | 35.8(53.31) |
| 18(450) | 40S | 18.0(457) | 0.375(9.53)*2 | 70.65(…) |
| 18(450) | 80S | 18.0(457) | 0.5(12.7)*2 | 93.54(…) |
| 20(500) | 5S | 20.0(508) | 0.188(4.78)*1 | 39.82(59.32) |
| 20(500) | 10S | 20.0(508) | 0.218(5.54)Notes(1),(2) | 46.1(68.65) |
| 20(500) | 40S | 20.0(508) | 0.375(9.53)*2 | 78.67(117.15) |
| 20(500) | 80S | 20.0(508) | 0.5(12.7)*2 | 104.23(155.13) |
| 22(550) | 5S | 22.0(559) | 0.188(4.78)*1 | 43.84(65.33) |
| 22(550) | 10S | 22.0(559) | 0.218(5.54)Notes(1),(2) | 50.76(75.62) |
| 22(550) | 40S | 22.0(559) | … | … |
| 22(550) | 80S | 22.0(559) | … | … |
| 24(600) | 5S | 24.0(610) | 0.218(5.54)*1 | 55.42(82.58) |
| 24(600) | 10S | 24.0(610) | 0.25(6.35)*1 | 63.47(94.53) |
| 24(600) | 40S | 24.0(610) | 0.375(9.53)*2 | 94.71(141.12) |
| 24(600) | 80S | 24.0(610) | 0.5(12.7)*2 | 125.61(187.07) |
| 30(750) | 5S | 30.0(762) | 0.25(6.35)*1 | 79.51(118.34) |
| 30(750) | 10S | 30.0(762) | 0.312(7.92)*1 | 99.02(147.29) |
| 30(750) | 40S | 30.0(762) | … | … |
| 30(750) | 80S | 30.0(762) | … | … |
Note
According to ASME B1.20.1, you cannot thread these wall thicknesses.
ASME B36.10M does not agree with these sizes.
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