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NPS 18 · STD
| Dimensions | ||
|---|---|---|
| WMass | 104.8 | |
| tThickness | 9.5 | |
| ODOutside diameter | 457 | |
| IDInside diameter | 438 | |
| AArea | 13,360 | |
| Major axis | ||
| IxSecond moment of area | 334.5 | |
| SxElastic modulus | 1,464 | |
| ZxPlastic modulus | 1,903 | |
| rxRadius of gyration | 158.3 | |
| ytopCentroid to top | 228.5 | |
| ybotCentroid to bottom | 228.5 | |
| Minor axis | ||
| IySecond moment of area | 334.5 | |
| SyElastic modulus | 1,464 | |
| ZyPlastic modulus | 1,903 | |
| ryRadius of gyration | 158.3 | |
| Torsion and warping | ||
| JTorsion constant | 668,900 | |
API 5L Table 3A/3B
| Steel type | Carbon-manganese, Nb/V/Ti allowed | |
|---|---|---|
| FyYield strength, minimum | 359 | |
| FuTensile strength, minimum | 455 | |
| EModulus of elasticity | 200,000 | |
| GShear modulus | 77,200 | |
| νPoisson's ratio | 0.3 | |
| ρDensity | 7,850 | |
| Flexure class, AISC 360 Table B4.1 | Non-compact, D/t 48.1 (λp 39, λr 172.7) | |
| API RP 2A-WSD group and class | Group II Class C; Class B with SR5/SR6 | |
| Capacity (nominal, no resistance or safety factors) | ||
| PyAxial yield, A·Fy | 4,795 | |
| MyYield moment, Sx·Fy | 525.5 | |
| MpPlastic moment, Zx·Fy | 683.1 | |
| Test Pressure | Std. | Alt. | |
|---|---|---|---|
| Grade A | 52 | 65 | |
| Grade B | 60 | 75 | |
| Grade X42 | 102 | 102 | |
| Grade X46 | 112 | 112 | |
| Grade X52 (grade picked) | 127 | 127 | |
| Grade X56 | 136 | 136 | |
| Grade X60 | 146 | 146 | |
| Grade X65 | 158 | 158 | |
| Grade X70 | 171 | 171 | |
| Grade X80 | 195 | 195 |