Section 27(3) in The Static and Mobile Pressure Vessels (Unfired) Rules, 2016
(3)Transfer systems-(i)transfer systems shall be so designed that the risk of a gas of a higher vapour pressure being transferred to equipment designed for gas of a lower vapour pressure is minimised;(ii)there shall be positive means of rapidly shutting off flow, located at a safe distance from the vessel which is being filled or emptied;(iii)automatic alarm device to indicate the approach to maximum permissible height or automatic shut-off valves shall be used to prevent over filling.
