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