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Reg. 317, Reg. 318, Reg. 319, Reg. 320
BLOW-DOWN COCK OR VALVE AND PIPES

General

 
The blow down cock or valve shall be of substantial construction. The waste pipe attached to the cock or valve shall not be bound fast in earth or brick work and shall discharge at a point where there is no danger of injury to any person. These pipes shall not be connected to a pipe common to another boiler. The continuous blow-downs may, however, be connected to a common header discharging freely to an adequately vented tank or sump. The headers shall be of sufficiently large cross section and the blow-off tank shall be provided with a vent pipe free from valves and of sufficient size to prevent accumulation of pressure. If, however, the tank is intended for collecting flash steam, a safety valve of adequate capacity shall be provided. The tank shall be so located that all parts will be accessible for inspection.


Reg. 318

Blow-down Mountings

a) Each boiler shall be fitted, with a suitable blow down valve or cock placed at, or as near as practicable, to the lowest point of the boiler.
b) For locomotive, vertical and marine type boilers, the valve or cock shall be

attached direct to the boiler or to a suitable pad or stand pipe. For water tube boilers the valve or cock shall be outside the brickwork with a substantial steel pipe between it and the mudbox.

c) For Cornish and Lancashire boilers the cock or valve may be attached to a cast steel elbow pipe of substantial section bolted to a suitable stand pipe or pad riveted to the boiler. But cast iron elbow pipes shall not be permitted.


Reg. 319

Blow-down Valve or Cock

a) Each valve or cock shall be fitted with a device which shall indicate clearly its open and closed positions, and any key or similar device for operating the valve or cock shall be such that it cannot be removed unless the valve or cock is fully closed.
b) The locking feather shall be secured by welding.
c) Cocks fitted with taper plugs shall be of the bolted cover type with separate packing glands.



Reg. 320
WATER GAUGES


a) Every boiler shall have two means of indicating the water in it of which one shall be conventional gauge glass:

Provided that in the case of boiler drums below 3 feet (91 cm) diameter where there is difficulty in fitting two water gauges, two test cocks and a glass water gauge shall be fitted.
b) The lowest visible part of the glass of the water gauge and lower test cock shall be fixed at safe working level. For locomotive type and vertical boilers this shall not be less than 50 millimetres above the highest part of the firebox roof plate.

Minimum length of the visible portion of the gauge glasses shall be 200 mm. The length may be increased depending upon the capacity of the boiler by the Chief Inspector/Director of boiler of the manufacturing State.
c) Glass water gauges shall be so placed as to be easily seen and reached by the boiler attendant. The fittings of glass water gauges and test cocks shall be of substantial make with large passage ways through them to facilitate cleaning. The gauge cocks when open shall have their handles in a vertical direction and each handle at its junction with the plug shall be plainly marked with a deep line to indicate the direction of the passage way through the plug. When detachable handle are provided arrangement shall be made to prevent incorrect fitting of the handles.

 
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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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