Division 4.2.2.2.1
The component shall be tested in accordance with the following procedure:
- (a)
Pressurise the component with dry air, nitrogen, helium or hydrogen to nominal working pressure and subject it to 96 per cent of the total number of test cycles in accordance with Table 4.2.2. at ambient temperature. A complete test cycle shall take place over a period of not less than 10 ± 2 seconds. When the valve is in the closed position the downstream pressure shall decay to 0,5 times the nominal working pressure of the component or lower. The component shall fulfil the requirements of the internal and external leakage tests (sections 4.2.4. and 4.2.5. respectively) at this temperature;
- (b)
The component shall then be operated through 2 per cent of the total number of test cycles at the minimum material temperature in accordance with section 2.7.5.1. after sufficient conditioning time at this temperature to ensure thermal stability. The component shall fulfil the requirements of the internal and external leakage tests (sections 4.2.4. and 4.2.5. respectively) at this temperature;
- (c)
The component shall then be operated through 2 per cent of the total number of test cycles at the maximum material temperature in accordance with section 2.7.5.1. after sufficient conditioning time at this temperature to ensure thermal stability and at 1,25 times nominal working pressure. The component shall fulfil the requirements of the internal and external leakage tests (sections 4.2.4. and 4.2.5. respectively) at this temperature.
Table 4.2.2.
Test cycles for valves
| Component | No. of test cycles |
|---|---|
| Automatic valve | 1,5 times the number of duty cycles or filling cycles in accordance with section 2.7.6. or 2.7.7., as appropriate to the use of the valve. |
| Manual valve | 100 |
| Non-return valve | 2,0 times the number of duty cycles or filling cycles in accordance with section 2.7.6. or 2.7.7., as appropriate to the use of the valve. |