Section 27(5)(c) in The Static and Mobile Pressure Vessels (Unfired) Rules, 2016
(c)in case of non-toxic, non-flammable gas (including cryogenic liquids) installations-4.5 M from property line. The robust crash barrier shall be provided in between storage vessel and hard stand at a distance of 2 meter (Minimum) from the storage vessel in order to protect fill point as well as pressure vessel;