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(e) When the boiler has achieved the required (set) pressure, the main steam isolating valve
should be slowly opened allowing steam to enter the system distribution pipework.
WARNINg
The system should be raised to temperature slowly to allow
for expansion and to avoid thermal shock and water hammer.
This can be achieved by one of two methods.
1.
Crack open the main steam valve and allow the system to heat up slowly, (minimum
15 minuets) before fully opening the main steam valve.
2.
Open the main steam valve when starting the boiler, allowing the boiler and system to
heat up together.
Note:
This can lead to water logging of the steam lines until full pressure is achieved.
3.6 DAILy OPERATINg TESTS (3.6 - 3.7)
Visually inspect the steam and feed water pipework, valves and fittings for signs of leakage. If leaks
are suspected shut the system down and evacuate the system to atmospheric pressure before
attempting to repair the leaks. The following procedure should be carried out by a competent person
to ensure the correct functioning of the water level and low water safety controls. Where possible, the
boiler should not be under steam pressure during these tests, (see 3.6.5.g.2.).
Note
: Ensure that the water level is maintained during the pressure build up. If any part of the equipment
is not operating correctly, the fault should be investigated before the boiler is used. Ensure that all
blowdown pipework is safe and discharged to a blowdown receptacle.
3.6.1. Pump Check
W
ith the burner firing and the pump not running, lower the water level in the boiler by opening
the main boiler blowdown valve.
As the water level falls, visible in the sight glass, and before the low water lock out position is reached
the water pump should start to run. When this happens close the main boiler blowdown valve.
The water pump should continue to run and re-fill the boiler to the correct level and stop.
3.6.4 First Low Water Level
(for boilers fitted with Spirax High Integrity Level Controls, see Appendix 'C')
(a) Ensure the following:
The burner is firing.
The water level is correct in the boiler.
The water pump is not running.
(b) Switch the pump off (Pump Interrupt) at the pump interrupt/pump run switch.
(c)
OPEN the main blowdown valve.
(d) When the water level nears the bottom of the water level gauge sight glass, the low water alarm
should sound, the low water alarm lamp should illuminate and the burner should stop firing.
When this happens, CLOSE the blowdown valve IMMEDIATELY.
(e) Switch the pump to RUN at the main pump interrupt/pump run switch. The pump should run
and refill the boiler. When the water level in the boiler rises above the first low water level, the
low water level lamp should extinguish, the audible alarm should silence and the burner start
sequence should commence automatically.
The pump should run until the boiler water level is correct and then stop.
3.5 STARTINg THE BURNER - continued.
3
3
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Страница 76: ...J OIL E 08 2008 F1 4 1 WATER LEVEL GAUGE ASSEMBLY 6 60 350mm and 300mm Clifton December 2004...
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