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Reg. 291, Reg. 292
SPECIAL REQUIREMENTS

Safety Valves

General

 
Safety valves, ordinary, high lift and full lift, shall be so constructed that breakage of any part will not obstruct the free and full discharge of steam from the boiler.


Reg. 292

Definition

a) Ordinary lift safety valve: A safety valve in which the valve head lifts automatically a distance of at least D/24 with an over-pressure not exceeding 10% of the set pressure. There shall not be any mechanical stop which would prevent the valve head from being lifted a distance of at least D/8. D is the minimum bore of the Body seat.
b) High lift safety valve: A safety valve in which the valve head lifts automatically a distance of at least D/12 with an over pressure not exceeding 10% of the set pressure. There shall not be any mechanical stop which would prevent the valve head from being lifted a distance of at least D/8. D is the minimum bore of the Body seat.
c) Full lift safety valve: A safety valve in which the valve head lifts automatically a distance such that the area of discharge which limits the flow through the valve is between 100% and 80% of the minimum area at any section at or below in body seat. This lift is achieved by a rapid opening within an over pressure not exceeding 5% of the set pressure.
 
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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
Indian Boilers Act 1923 Ibr Forms Home Search Help Contact Us