INSTALLATION
METAL TO METAL SEATED VALVES
Perform installation welding in accordance with ASME Boiler and Pressure Vessel Code, Sec. I, Part PW, or ANSI B31.1 Para 127.
IMPORTANT:
| A. DO NOT DISASSEMBLE VALVE. Valve must be assembled and tightly closed during welding to protect seat from heat distortion and weld splatter. |
| B. Allow 1/16" gap between bottom of socket, or butt weld end, and end of pipe (PW 41.5.7, or ANSI B31.1 Para 127.3.3). |
| C. Preheat per Table 1. |
| A. Remove stem assembly as detailed in the REPAIR, section A, of these instructions, steps 1 - 4. |
| B. Reassemble valve using Metal Disc Stem Assembly as detailed in the REPAIR, section G, of these instructions, steps 2 and 3, a. through e. |
| C. Follow INSTALLATION section above, A through C. |
| D. Follow steps A and B to put in Soft Seated Stem Assembly. |
NOTE: For Soft Seated Check Valves you must remove the Disc and Spring and follow instructions for Soft Seated Valves. |
| P-1 SA-105 |
P-5 SA-182 GR. F22 |
P-8 SA-182 GR. F316 |
||
| PREHEAT 50° F (A100.4.1)* |
PREHEAT 400° F (A100.4.4)* |
PREHEAT NONE REQUIRED (A100.4.7)* |
||
| POST WELD HEAT TREAT NONE REQUIRED (PW-39) |
POST WELD HEAT TREAT REQUIRED WHEN NOMINAL WALL THICKNESS EXCEEDS 5/8" (PW-39) LOCALIZED ONLY PER (PW-39-4-2) |
POST WELD HEAT TREAT NONE REQUIRED (PW-39) |
||
| * ASME BOILER AND PRESSURE VESSEL CODE, SECTION I, PART PW-38 | ||||