Aqueous ammonia having a specific gravity of 0.94 is maintained at the bottom of the glass chamber below the sample at a concentration of at least 20 ml per litre of chamber volume. The sample is positioned 35 (±5) mm above the aqueous ammonia solution and supported in an inert tray. The moist ammonia-air mixture is maintained at atmospheric pressure at 35 (±5) ºC. Copper-based alloy components shall not exhibit cracking or delaminating due to this test. 2.10. Pre-cooled hydrogen exposure test The valve unit is subjected to pre-cooled hydrogen gas at -40 ºC or lower at a flow rate of 30 g/sec at external temperature of 20 (±5) ºC for a minimum of three minutes. The unit is de-pressurized and re-pressurized after a two minute hold period. This test is repeated ten times. This test procedure is then repeated for an additional ten cycles, except that the hold period is increased to 15 minutes. The unit shall then comply with the requirements of the ambient temperature leak test specified in Annex 4, paragraph 2.2.
Aqueous ammonia having a specific gravity of 0.94 is maintained at the bottom of the glass chamber below the sample at a concentration of at least 20 ml per litre of chamber volume. The sample is positioned 35 (±5) mm above the aqueous ammonia solution and supported in an inert tray. The moist ammonia-air mixture is maintained at atmospheric pressure at 35 (±5) ºC. Copper-based alloy components shall not exhibit cracking or delaminating due to this test. 2.10. Pre-cooled hydrogen exposure test The valve unit is subjected to pre-cooled hydrogen gas at -40 ºC or lower at a flow rate of 30 g/sec at external temperature of 20 (±5) ºC for a minimum of three minutes. The unit is de-pressurized and re-pressurized after a two minute hold period. This test is repeated ten times. This test procedure is then repeated for an additional ten cycles, except that the hold period is increased to 15 minutes. The unit shall then comply with the requirements of the ambient temperature leak test specified in Annex 4, paragraph 2.2.
ECE-TRANS-WP29-2018-068e.docx