Section 30(5) in The Static And Mobile Pressure Vessels (Unfired) Rules, 1981
(5)For keeping attention during operations-(i)a competent person shall remain in attendance during all the operations connected with the transfer and ensure that all the requirements of these rules are complied with;(ii)if it is necessary to discontinue a vehicle loading operation temporarily, the loading hose, shall be disconnected from the vehicle for the period of such discontinuance.
