(2)Exceptions. - Nothing in this rule shall apply to -(a)Vessels made of ferrous materials having an internal operating pressure not exceeding 1 Kg/cms 2 (15 lbs/Sq.inch) ;(b)Steam boilers, steam and feed pipes and their fittings coming under the purview of Indian Boilers Act, 1923 (V of 1923) ;(c)metal bottles or cylinders used for storage or transport of compressed gases or liquified or dissolved gases under pressure covered by the Gas Cylinder Rules, 1940 framed under the Indian Explosive Act, 1884 (IV of 1884);(d)vessels in which internal pressure is due solely to the static head of liquid ;(e)vessels with a nominal water capacity not exceeding 500 liters connected in a water-pumping system containing air that is compressed to serve as a cushion;(f)vessels for nuclear energy application ;(g)Refrigeration plant having a capacity of 3 tones or less or refrigeration in 24 hours; and(h)Working cylinders of steam engines or prime movers, feed pumps and steam traps; turbine casings; compressors cylinders; steam separations or dyers; steam strainers; stream de-super heaters; oil separators; air receivers for fire sprinkler installations; air receivers or monotype machines provided the maximum working pressure of the air receiver does not exceed 1.33 kg.f/cm 2 (20lb/sq.inc.) and the capacity 84.95 liters (3cu.ft.); air receivers of electrical circuit breakers; air receivers of electrical relays; air vessels on pumps, pipe coils accessories of instruments and appliances, such as cylinders and piston assemblies used for operating relays and inter-locking type of guards; vessels with liquids subjected to static head only; and hydraulically operating cylinders other than any cylinder communicating with an air and accumulator.
