Common use of Leak test Clause in Contracts

Leak test. This test applies to one TPRD that has not undergone previous design qualification tests and additional units as specified in other tests in Annex 4, paragraph 1. The leak test is performed at ambient, high and low temperatures. The unit shall be thermally conditioned at each of the required test temperatures and held pressurized to ≥2 MPa for at least one hour to ensure thermal stability before testing. The TRPD is pressurized with leak test gas at the inlet. The test conditions are: (a) Ambient temperature: condition the unit at ambient temperature; test at 2 ± 0.5 MPa and ≥ 125 per cent NWP; (b) High temperature: condition the unit at ≥ 85 °C; test at 2 ± 0.5 MPa and ≥ 125 per cent NWP; (c) Low temperature: condition the unit at ≤ -40 °C; test at 2 ± 0.5 MPa and ≥ 100 per cent NWP. Following conditioning at each of the specified test temperatures, the unit is observed for leakage while immersed in a temperature-controlled fluid (or equivalent method) for at least one minute at each of the test pressures listed above. If no bubbles are observed for the specified time period, the sample passes the test. If bubbles are detected, the leak rate is measured. The total hydrogen leak rate shall be less than 10 Nml/h.