Section 67(2)(i) in The M.P. Factories Rules, 1962
(i)working of cylinders of steam engines or prime mover feed pumps and steam steps; turbine casings; compressor cylinders; steam separators of dryers; steam stramers; steam; de-super heaters; oil seed operators; air receivers for fire sprinkler installations; air receivers; of monotype machines provided the maximum working pressure of the air receiver does not exceed 1.33 Kg. f/ cm 2 (20 Lbs/ sq. in) and the capacity 84.95 liters (3 cu.ft.); air receivers electrical breakers; air receiver of electrical relay; air vessels on pumps pipe/coils, accessories of instruments and appliances such as cylinders and piston assemblies use for operating relays and interlocking appear of guards; vessels with liquids subjected to static head only; and hydraulically operating cylinders other than any cylinder communicating with an air loaded accumulator.