ASME B16 40:2019 pdf download.Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems.
6.2 Production Testing
6.2.1 SheLL Test. Each valve shall be tested at 4 psi ± 2 psi (0.28 bar ± 0.14 bar) and ata minimum of 1.5 times the design pressure. The test pressure shall be applied to all pressure-containing areas of the valve (including stem seals and valve ends). This may require the valve to be in the partially open position. The shell test shall be conducted at a temperature of 73°F ± 15°F (2 3°C ± 8°C). The test fixturing shall not restrain the valve against any mode of failure or leakage. The minimum duration of each of the two shell tests shall be as shown in Table 6.2.1-1.
6.2.2 Seat Test. Each valve shall be seat closure tested at4 psi ± 2 psi (0.28 bar ± 0.14 bar) and ata minimum of 1.5 times the valve design pressure. These pressures shall be applied successively on each side of the valve seat(s) to check the valve-sealing performance in both directions. The seat test shall be conducted at a temperature of 73°F ± 15°F (23°C ± 8°C). The seat test’s fixturing shall not restrain the valve against any mode of failure or leakage. The minimum duration of each portion of the test shall be as shown in Table 6.2.1-1.
6.3 QuaLification Testing
6.3.1 OperationaL Test. It shall be demonstrated that each nominal size of each basic valve design is capable of successfully passing the seat leakage tests of para. 6.2.2 after having completed ten fully opened/closed cycles at 73°F ± 15°F (23°C ± 8°C). The valve shall be pressurized with air or other gas to the design pressure at one port with the other port open to atmosphere before opening on each cycle. At the start of each cycle, the operating torque shall be measured and not exceed those in Table 6.3.1-1 for —20°F (—29°C).
The test method is as follows: a closed valve shall be cooled to a temperature of —2 0°F ± 5°F (—29°C ± 3°C) and held at that temperature for a minimum of 18 hr. The valve shall then be pressurized with air or gas to a differential pressure across the seat equal to the valve design pressure. The valve shall then be opened against the applied-differential pressure, using a torque less than or equal to that of Table 6.3.1-1 at the —20°F (—29°C) values and then closed (no differential pressure across the seat required).ASME B16 40 pdf download.