Water gauge glass constructed from flat or prismatic glass may be required for high-pressure boilers. The gauge glass device, which has stood the test of time, is used on the vast majority of boilers and is usually arranged to give a visible range of water level above and below the normal water level.
In the UK, the lower of the two alarms will 'lockout' the burner, and manual resetting is required to bring the boiler back on line. High water alarm - The alarm operates if the water level rises too high, informing the boiler operator to shut off the feedwater supply.
Low-water cutoff, evaporation test (steam boiler)– While the boiler is in operation, shut off the feedwater . pump and monitor the boiler water-level. The low-water cutoff should shut down the burner before the water level …
Methods of Detecting Water Level in Steam Boilers | Spirax
As can be seen, the dangers of an excessively high water level are too serious to ignore, and deserve equal consideration to that given to low water level conditions. A high water condition could: Simply sound an alarm if the boiler house is manned. Shut-down …
Lower the actual boiler water level to the 1st low (by evaporation), and then blow down to the 2nd low. The main reason for this weekly test is to ensure that the alarm is given, and at the correct level, when the level drops slowly in the boiler (because floats could stick). 2. A high alarm is usually tested weekly.
In Boiler Safety, Water Level Is Critical - EHS Daily Advisor
Apr 23, 2018 · The gauge glass is the first and easiest means. A second device is the try cocks, a valve located on the water column used to determine the water level if the gauge glass is not functional. When blowing down (intentionally wasting water) the water column and gauge glass, the operator should carefully monitor the action of the water in the gauge glass.