Section 16(1) in The Static and Mobile Pressure Vessels (Unfired) Rules, 2016
(1)The Maximum quantity of liquefiable gas filled into any vessel shall be limited to the filling density of the gas and shall be such that the vessel shall not be liquid-full due to expansion of the contents with rise of the temperature to 550 C. If vessel is un-insulated, or to the highest temperature which the contents are likely to reach in service. If the vessel is refrigerated or insulated, this requirement shall be applicable irrespective of the ambient temperature of the product at the time of filling.
