ASME B16.9
ASTM
ASTM A234 WPB Butt-Weld Cap Dimensions & Weight Chart (ASME B16.9 SCH 40)
Carbon Steel ASTM A234 WPB · SCH 40 / STD · 1/2" to 24"
Dimensions & weight table
Reference values for layout and freight estimates. Confirm critical dimensions against the latest ASME edition and your project ITP before procurement.
| NPS | DN | OD (mm) | Wall (mm) | C / A (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 1/2" | 15 | 21.3 | 2.77 | 16 | 0.09 |
| 3/4" | 20 | 26.7 | 2.87 | 19 | 0.11 |
| 1" | 25 | 33.4 | 3.38 | 25 | 0.12 |
| 1-1/4" | 32 | 42.2 | 3.56 | 32 | 0.14 |
| 1-1/2" | 40 | 48.3 | 3.68 | 38 | 0.16 |
| 2" | 50 | 60.3 | 3.91 | 51 | 0.19 |
| 2-1/2" | 65 | 73 | 5.16 | 64 | 0.23 |
| 3" | 80 | 88.9 | 5.49 | 76 | 0.27 |
| 4" | 100 | 114.3 | 6.02 | 102 | 0.33 |
| 5" | 125 | 141.3 | 6.55 | 127 | 0.4 |
| 6" | 150 | 168.3 | 7.11 | 152 | 0.47 |
| 8" | 200 | 219.1 | 8.18 | 203 | 0.61 |
| 10" | 250 | 273.1 | 9.27 | 254 | 0.75 |
| 12" | 300 | 323.9 | 10.31 | 305 | 0.89 |
| 14" | 350 | 355.6 | 11.13 | 330 | 1.03 |
| 16" | 400 | 406.4 | 12.7 | 356 | 1.17 |
| 18" | 450 | 457.2 | 14.27 | 381 | 1.31 |
| 20" | 500 | 508 | 15.09 | 406 | 1.45 |
| 24" | 600 | 610 | 17.48 | 483 | 1.73 |
Material data
Chemical composition
- C
- ≤ 0.30 %
- Mn
- 0.29 – 1.06 %
- P
- ≤ 0.050 %
- S
- ≤ 0.058 %
- Si
- ≥ 0.10 %
Mechanical properties
- Tensile strength
- ≥ 415 MPa (60 ksi)
- Yield strength
- ≥ 240 MPa (35 ksi)
- Elongation
- ≥ 30 % (in 50 mm)
Manufacturing & quality assurance
Yanshan Hengzhenyuan Pipeline — integrated forming, heat treatment, machining and NDT for export utility and EPC programs.
Production capability
- Seamless or welded caps per ASME B16.9; WPB material traceability
- Deep-drawn or pressed caps for small NPS; plate-formed for large NPS
- Heat treatment per grade; beveled socket end per B16.25
- Used for line ends, hydro test blanks and temporary isolation
Inspection & release
- Dimensional check of length M and OD; PMI per heat
- Surface NDE on welds when applicable
- Hydro test support documentation for package orders
- Third-party inspection and 3.1 MTC for export
Engineering FAQ
The table lists end-to-end length M per ASME B16.9 for standard weld caps matching SCH 40 wall on the listed NPS.
Weld caps close the pipe end for testing when welded in place. For repeated bolt-up tests, a blind flange may be more suitable.
Special caps from approved drawings can be quoted. Standard catalog caps follow B16.9 straight caps.
Yes on inquiry. Wall thickness and weight differ from SCH 40; specify schedule on the MTO.
Quick RFQ
Include quantity, delivery port and required certificates. We respond with mill pricing and lead time.