Division 4.2.4.2 Procedure

The components shall be tested using leak test gas and shall be pressurised at the inlet of the component when it is in its characteristic closed position and with the corresponding outlet port open.

The components shall be tested at the following conditions:

1. (a)

   At ambient temperature and at 0,02 times nominal working pressure and at nominal working pressure. Where an external leakage test (section 4.2.5.) is also required at this temperature it may be undertaken before the next stage of this test;

2. (b)

   At the minimum material temperature in accordance with section 2.7.5.1., after sufficient conditioning time at this temperature to ensure thermal stability and at 0,02 times nominal working pressure and at nominal working pressure. Where an external leakage test (section 4.2.5.) is also required at this temperature it may be undertaken before the next stage of this test;

3. (c)

   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 0,02 times nominal working pressure and 1,25 times nominal working pressure, except for components with a required material temperature of 120 °C where the higher test pressure shall be 1,37 times nominal working pressure.

The component shall be observed for leakage with its outlet port open. The leakage can be determined by a flowmeter installed on the inlet side of the component or by another test method, which has been demonstrated to be equivalent.