Section 22(2) in The Static And Mobile Pressure Vessels (Unfired) Rules, 1981
(2)If the aggregate water capacity of a multi-vessel installation exceeds forty thousand litres, the minimum safety distance from any vessel to the property line/group of buildings shall not be less than,-(a)thirty metres for corrosive, toxic or flammable gases;(b)fifteen metres for non-corrosive, non-toxic or non-flammable gases;
