Section 29 in The Static And Mobile Pressure Vessels (Unfired) Rules, 1981
29. Loading and unloading facilities .-(1) Pumps .-(i) pumps may be centrifugal or positive displacement pumps;
(ii)design materials and construction of pumps shall be suitable for the type of gas to be handled and they shall be designed for the maximum outlet pressure to which they will be subjected to in operation;(iii)positive displacement pumps shall have a by pass value or other suitable protection against over pressure.(2)Compressors.-(i) the design, material and construction of compressors shall be suitable for the type of gas which they are to handle and they shall be designed for the maximum outlet pressure to which they will be subjected to in operation;(ii)compressors other than multi-stage compressors shall take suction from the vapour space of the vessels being filled.(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 of automatic shut-off valves shall be used to prevent over filling.(4)Hoses .-(i) the hoses for liquid transfer shall be designed to withstand not less than four times the maximum operating pressure they will carry in service;(ii)the hoses shall be mechanically and electrically continuous.(5)[ In the tank-truck loading or unloading gantry, number of bays for parking tank-trucks shall not exceed eight, and number of such gantries in a premises shall not exceed two.(6)Rail tank wagon loading or unloading shall be restricted to a maximum of half a rake (six hundred tonnes). If full rake handling is required, it shall be placed in two separate gantries with fifty metres distance in between them.(7)All valves on the vessel and pipelines in the premises shall be permanently marked in a manner clearly indicating the direction of opening and closing.]
