Section 49C in The West Bengal Factories Rules, 1958
49C. [ Reaction vessels and kettles. [Rule 49C inserted by West Bengal Factories (Amendment) Rules, 1991.]
(1)This rule applies to reaction vessels and kettles, hereinafter referred to as reaction vessels, which normally work at a pressure being created above the atmospheric pressure due to reaction getting out of control or any other circumstances.(2)In the event of the vessel being heated by electrical means, a suitable thermostatic control device shall be provided to prevent the temperature exceeding the safe limit.(3)Where steam is used for heating purpose in a reaction vessel, it shall be supplied through a suitable pressure reducing valve or any other suitable automatic device to prevent the maximum permissible steam pressure being exceeded, unless the pressure of the steam in the supply line itself cannot exceed the said maximum permissible pressure.(4)A suitable safety valve or rupture disc of adequate size and capacity shall be provided to effectively prevent the pressure being built up in the reaction vessel beyond the safe limit. Effective arrangement shall also be made to ensure that the released gas, fumes, vapours, liquids or dusts, as the case may be, are led away and disposed of through suitable pipes without causing any hazard. Where flammable gas or vapours are likely to be vented out from the vessel, the discharge end shall be provided with a flame arrester.(5)Every reaction vessel shall be provided with a pressure gauge having the appropriate range.(6)In addition to the devices as mentioned in the foregoing provisions, means shall be for automatically stopping the feed into the vessel as soon as process conditions deviate from the normal limits to an extent which may be considered as dangerous.(7)Wherever necessary, an effective system for cooling, flooding or blanketing shall be provided for the purpose of controlling the reaction and process conditions within the safe limits of temperature and pressure.(8)An automatic auditory and visual warning device shall be provided for clear warning whenever process conditions exceed the present limit.This device, wherever possible, shall be integrated with automatic process correction system.(9)A notice pointing out the possible circumstances in which pressure above atmospheric pressure may be built up in the reaction vessel, the dangers involved and the precautions to be taken by operators shall be displayed at a conspicuous place near the vessel.]
