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Reg. 283, Reg. 284, Reg. 285, Reg. 286
METHOD OF CONSTRUCTION

Castings

a) All castings shall be smooth, sound and free from flaws, cracks or other injurious defects. Variations in thickness at any part shall be gradual and substantial fillets shall be provided.
b) The body of a boiler mounting shall be connected to the boiler flange by a strong and stiff neck. In no case shall the thickness of the neck of bronze mounting be less than 3/16 inch for sizes up to and including 3/4 inch bore.



Reg. 284

Packing of Cocks

The bodies of all cocks except those for pressure gauges shall be packed with asbestos or other heat resisting material and shall be or substantial design, those over one inch bore shall have special provision, other than the gland for securing the plug.

Water gauge column cocks may be either asbestos packed or solid plug type.



Reg. 285

Covers and Spindles

a) Valves of 1½ inch bore and over directly connected to boilers, and other valves of 2½ inch bore and over where fitted with a cover shall have such cover secured by bolts or studs and the screwed portion of the spindle shall be outside the stuffing box. All valves for superheated steam shall be fitted with an external screwed spindle.
b) Where the covers of valves are secured by studs, the studs shall be screwed into the body with full thread for a length of at least one diameter. The stud holes shall not penetrate into the pressure space of any casting.
c) Valves with screwed covers shall be fitted with suitable locking device to prevent rotation of the cover.


Reg. 286

Direction of Operation

Valves shall be clearly marked to indicate the direction of flow. Valves directly connected to boilers shall be fitted with indicators to show clearly whether the valve is closed or open and all valves shall open by anti-clockwise rotation.
 
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
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