Dangerous Goods by Road
the pressure-relief devices shall consist of spring-loaded valves fitted to prevent significant build-up
within the portable tank of the decomposition products and vapours released at a temperature of
50 °c. the capacity and start-to-discharge pressure of the relief valves shall be based on the results of
the tests specified in 4.2.1.13.1. the start-to-discharge pressure shall, however, in no case be such that
liquid would escape from the valve(s) if the portable tank were overturned.