(1)This rule shall apply to reaction vessels and kettles (hereinafter referred to as reaction vessels) which normally work at a pressure not above the atmospheric pressure but in which there is likelihood of 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 purposes 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 old capacity shall be provided to effectively prevent the pressure being built up in the reaction vessel beyond the safe limit. Effective arrangements shall be made to ensure that the released, gases, 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 gases or vapours are likely to be vented out from the vessel, and the discharge end shall be provided with a flame arrestor.(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 to be provided for automatically stopping the feed into the vessel as soon as process conditions deviate from the normal limits to an extent which can be considered as dangerous.(7)Where 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 limits. This device, wherever possible shall be integrated with automatic process correction systems.(9)A notice pointing out the possible circumstances in which pressures above atmospheric pressure may be built up in the reaction vessel, the danger involved and the precaution to be taken by the operators shall be displayed at a conspicuous place near the vessel.
