Tolerance of Outside Diameter and Wall Thickness
| Standard | Tolerance of Pipe Body | Tolerance of Pipe End | Tolerance of Wall Thickness |
| Out Diameter | Tolerance | Out Diameter | Tolerance |
| GB/T3091 | OD≤48.3mm | ≤±0.5 | OD≤48.3mm | - | ≤±10% |
| 48.3 | ≤±1.0% | 48.3<od≤273.1mm< span="" style="padding: 0px; margin: 0px;"> | - |
| 273.1 | ≤±0.75% | 273.1<od≤508mm< span="" style="padding: 0px; margin: 0px;"> | -0.8~+2.4 |
| OD>508mm | ≤±1.0% | OD>508mm | -0.8~+3.2 |
| GB/T9711.1 | OD≤48.3mm | -0.79~+0.41 | - | - | OD≤73 | -12.5%~+20% |
| 60.3 | ≤±0.75% | OD≤273.1mm | -0.4~+1.59 | 88.9≤OD≤457 | -12.5%~+15% |
| 508 | ≤±1.0% | OD≥323.9 | -0.79~+2.38 | OD≥508 | -10.0%~+17.5% |
| OD>941mm | ≤±1.0% | - | - | - | - |
| GB/T9711.2 | 60 | ±0.75%D~±3mm | 60 | ±0.5%D~±1.6mm | 4mm | ±12.5%T~±15.0%T |
| 610 | ±0.5%D~±4mm | 610 | ±0.5%D~±1.6mm | WT≥25mm | -3.00mm~+3.75mm |
| OD>1430mm | - | OD>1430mm | - | - | -10.0%~+17.5% |
| SY/T5037 | OD<508mm | ≤±0.75% | OD<508mm | ≤±0.75% | OD<508mm | ≤±12.5% |
| OD≥508mm | ≤±1.00% | OD≥508mm | ≤±0.50% | OD≥508mm | ≤±10.0% |
| API 5L PSL1/PSL2 | OD<60.3 | -0.8mm~+0.4mm | OD≤168.3 | -0.4mm~+1.6mm | WT≤5.0 | ≤±0.5 |
| 60.3≤OD≤168.3 | ≤±0.75% | 168.3 | ≤±1.6mm | 5.0 | ≤±0.1T |
| 168.3 | ≤±0.75% | 610 | ≤±1.6mm | T≥15.0 | ≤±1.5 |
| 610 | ≤±4.0mm | OD>1422 | - | - | - |
| OD>1422 | - | - | - | - | - |
| API 5CT | OD<114.3 | ≤±0.79mm | OD<114.3 | ≤±0.79mm | ≤-12.5% |
| OD≥114.3 | -0.5%~1.0% | OD≥114.3 | -0.5%~1.0% | ≤-12.5% |
| ASTM A53 | ≤±1.0% | ≤±1.0% | ≤-12.5% |
| ASTM A252 | ≤±1.0% | ≤±1.0% | ≤-12.5% |
SSAW steel pipe is the raw material of strip coil, often temperature extrusion molding, automatic double-wire double submerged arc welding process made of spiral seam pipe. Spiral steel pipe will strip into the pipe unit, the multi-roll rolling, strip rolled up, forming a circular gap opening gap, adjust the squeeze roll reduction, the weld gap control in the 1 ~ 3mm, and make both ends of the weld flush.
| Out Diameter | Wall Thickness (mm) |
| mm | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| 219.1 | . | . | . | . |
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273
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| 323.9 | . | . | . | . | . | . | . |
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| 325 | . | . | . | . | . | . | . |
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| 355.6 | . | . | . | . | . | . | . |
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| 377 | . | . | . | . | . | . | . | . |
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| 406.4 | . | . | . | . | . | . | . |
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| 426 | . | . | . | . | . | . | . |
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| 457 | . | . | . | . | . | . | . |
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| 478 | . | . | . | . | . | . | . |
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| 508 | . | . | . | . | . | . | . |
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| 529 | . | . | . | . | . | . | . |
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| 630 | . | . | . | . | . | . | . |
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| 711 | . | . | . | . | . | . | . | . | . | . | . |
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| 720 | . | . | . | . | . | . | . | . | . | . | . |
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| 813 |
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| 820 |
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| 920 |
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| 1020 |
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| 1220 |
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| 1420 |
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| 1620 |
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| 1820 |
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| 2020 |
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| 2220 |
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| 2500 |
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| 2540 |
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| 3500 |
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