Division 4.2.5.3 Requirements

Throughout the test the component shall be free from leakage through stem or body seals or other joints, and shall not show evidence of porosity in casting, demonstrated by a surface active agent without formation of bubbles for 3 minutes or measured with a combined leakage and permeation rate less than 10 Ncm³ per hour (for flexible fuel lines only 10 Ncm³ per hour per meter) or it shall be tested by using a demonstrated equivalent test method. The permitted leakage rate is applicable to tests with 100 per cent hydrogen only. Permitted leakage rates for other gases or gas mixtures shall be converted to an equivalent leakage rate to that for 100 per cent hydrogen.