The Indian Boilers Act
Section 3: Limitation of application
(1) Nothing in this Act shall apply in the case of any boiler or steam-pipe
(a) in any steam-ship as defined in section 3 of the 5 Indian Steam-ships Act, 1884, or in any steam-vessel as defined in section 2 of the Inland Steam-vessels Act, 1917; or
(b) belonging to, or under the control of, the Army, Navy or Air Force; or
(c) appertaining to a sterlizer or disinfector of a type such as is commonly used in hospitals, if the boiler does not exceed Ninety-one litres in capacity.
(2) The Central Government may, by notification in the Official Gazette, declare that the provision of this Act shall not apply in the case of boilers of steam-pipes, or of any specified class of boilers or steam-pipes, belonging to or under the control of any railway administered by the Central Government or by any State Government or by any railway company as defined in clause (5) of section 3 of the Indian Railways Act, 1890.