E.3 Installation gas tightness testE.3.1 GeneralThe installation shall be tested using either method in Clause E.3.2 or E.3.3.E.3.2 Method 1 — Pressure lossThe installation test shall be carried out as follows:(a) Ensure all open ends are plugged or capped.(b) Ensure all gas appliance isolation valve(s) are open, and appliance control valve(s) turned off. Any gas appliance with an interlock shall be in the open position.(c) Connect the test instrument (e.g. manometer).(d) Open the LP Gas cylinder valve or apply pressure using regulated compressed air or inert gas to operating pressure.(e) Isolate the pressure source and allow a period (e.g. 2 min) for the temperature of the testing medium within the installation to stabilize.(f) Measure any loss of pressure during a test period of 5 min.The installation shall be considered gastight and the test satisfactory if there is no detectable loss of pressure during the test period of 5 min. If a pressure loss is detected then any leakage shall be located and rectified, and the installation shall be retested.E.3.3 Method 2 — Using bubble leakage detectorThe installation test shall be carried out as follows:(a) Connect the bubble test set to the installation.(b) Ensure all open ends are plugged or capped.(c) Ensure all gas appliance isolation valve(s) are open, and appliance control valve(s) turned off.(d) Open the LP Gas cylinder valve or apply pressure using regulated compressed air or inert gas.(e) Allow the system to pressurize for 5 s then depress the “diversion valve” so that the gasstream passes through the liquid bowl.(f) While depressing the “diversion valve” observe the liquid bowl for evidence of bubbles through the liquid.The installation shall be considered gastight if there are no bubbles through the liquid for a period of 10 s. If bubbles are detected then any leakage shall be located and rectified, and the installation shall be retested.E.4 Methods of locating gas leaksA non-corrosive soap and water solution or leakage detection fluid applied externally or other gasdetecting equipment or means shall be the only methods used to locate a gas leak. Matches, candles or any other ignition source shall not be used.Testing of the connections between cylinders and the first-stage regulator shall be made at LP Gas cylinder pressure, using a non-corrosive soap and water, detergent solution or leakage detection fluid to detect leaks at all joints.