and three quick-closing gauge valves and try cocks fitted with the
necessary chains and handles for operation from the boiler room floor.
[Water column lighting shall be provided for ease of reading at all times.]
2.2.4.2
Water Gauge
Water gauge drain valve of the straight-through type shall be provided.
2.2.4.3
Low Water Cutoff
Low water cutoff with alarm located on instrument panel shall include
either a float-actuated switch as a means of making electrical contact or
an electrically-actuated probe type low water cutoff. The float chamber
shall be provided with a blowdown connection. The cutoff shall cause a
safety shutdown and sound an alarm when the boiler water level drops below
a safe minimum level. A safety shutdown due to low water cutoff shall
require a manual reset before operation can be resumed and shall prevent
recycling of the [burner] [stoker].
2.2.4.4
Bypass Button
A spring-loaded shunt bypass button shall be provided to prevent nuisance
shutdowns during sightglass blowdown.
2.2.4.5
Steam Gauge
Steam gauge shall be provided for each boiler in a visible location on the
boiler.
2.2.4.6
Feed and Check Valves
Feed and check valves shall be provided adjacent to each boiler feed nozzle.
2.2.4.7
Continuous Blowdown Valve
**************************************************************************
NOTE: Continuous blowdown equipment will be
provided if required by TM 5-810-1. If a firetube
boiler is specified, these paragraphs will be
deleted.
**************************************************************************
Continuous blowdown valve shall be manual proportioning type fabricated of
corrosion-resistant steel. The valve shall be equipped with a micrometer
dial and pointer to indicate the proportional setting.
2.2.4.8
Safety Valves
Safety valves of proper size and of the required number and construction
and set pressures shall be in accordance with of the ASME BPVC SEC I and
shall be installed so that the exhaust steam will discharge through pipes
extending through the roof. Each exhaust riser shall have a drip-pan elbow
to prevent the accumulation of water on the valve. A suitable slip joint
shall be provided between the drip-pan elbow and the riser.
2.2.4.9
Blowoff Valves
Blowoff valves in tandem shall be provided at each point of blowdown as
recommended by the boiler manufacturer. Piping shall be extra-heavy
SECTION 15559A
Page 26
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