Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
| ASTM A234 ASME SA234 | WPB | WPC | WP1 | WP12 CL1 | WP12 CL2 | WP11 CL1 | WP11 CL2 |
| WP11 CL3 | WP22 CL1 | WP22 CL3 | WP5 CL1 | WP5 CL3 | WP9 CL1 | WP9 CL3 | |
| WPR | WP91 | WP911 | |


