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Reg. 297, Reg. 298, Reg. 299

Opening in Shell

 
No accessories other than those integral with the Safety Valve shall obstruct the openings in the boiler shell. Discharging steam shall have direct access to the safety valve without flowing through internal pipes.



Reg. 298

Discharge Passage

The safety valve discharge pipes shall comply with the requirements of clauses (a) and (b) of this regulation. The discharge pipe shall be as short and straight as possible and be fitted with open drain to prevent accumulation water in the pipe. Suitable arrangement shall be provided in the discharge pipe system so that the discharge can readily be heard by the Boiler Attendant.

a) Steam safety valves: -

(i) Ordinary and high lift valves. Where a waste steam-pipe is fitted the pipe and the passage leading to it shall have a cross-sectional area not less than the minimum combined area of the safety valves required by Regulation 293.
(ii) Full lift valves. For full lift valves the area of waste steam-pipe and passages leading to it shall have a cross-sectional area not less than twice A, or such area above this minimum as may be required for valves having a higher approved constant, where A,E and P are as defined in regulation 293.
b) Economiser safety valves. The area of the discharge pipe from an economiser safety valve shall be at least twice the area of the valve seating. Where the discharge from several economiser safety valves is connected to the main discharge pipe, the diameter of the main discharge pipe shall be designed to prevent accumulation of pressure due to the formation of steam under the particular conditions of temperature and pressure which may be applicable.



Reg. 299

Drainage

For each enclosed safety valve chest a means of draining shall be provided. The drain pipe shall be laid with a continuous downward gradient clear of the boiler to a place where the discharge is visible and cannot do injury to any person.
 
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