IBR is Indian Boiler Regulations, which was created in 15th September 1950 in exercise of the powers conferred by section 28 & 29 of the Indian Boilers Act. The Indian Boilers Act was formed in 1923, 23rd February to consolidate and amend the law relating to steam boilers.
Steam Boilers that come under IBR are:-
Steam boiler:
Steam boilers under IBR means any closed vessel exceeding 22.75 liters in capacity and which is used expressively for generating steam under pressure and includes any mounting or other fitting attached to such vessel which is wholly or partly under pressure when the steam is shut off. & NON IBR simply means any steam producing equipment lesser than 22.75 ltrs of water hold up capacity.
Steam pipes:
IBR steam pipe means any pipe through which steam passes from a boiler to a prime mover or other user or both if pressure at which steam passes through such pipes exceeds 3.5 kg/cm2 above atmospheric pressure or such pipe exceeds 254 mm in internal diameter and includes in either case any connected fitting of a steam pipe.