(4)A suitable safety valve or rupture disc of adequate size and capacity shall be provided to effectively prevent the pressure being buildup in the reacting 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 the discharge valve shall be provided with a flame arrestor.
