Guide to safer boiler operation
The most important rule – The most important rule for the safe operation of boilers is to maintain the proper water-level at all times, and as constant a level as conditions will permit. If water is not visible in the water glass, shut the boiler off immediately until a safe water-level has been determined.
Boiler water-level – The first duty when taking over a boiler-room shift is to make certain the pipe, fittings and valves between the water glass and boiler are free and open by blowing down the water column and water glass and noting the promptness of the return of water to the glass.
Low-water and feedwater controls – The low-water cutoff is the most important electrical/mechanical device on your boiler for maintaining a safe water-level. If a low-water condition develops, it could very well result in an overheating and explosion of your boiler. The low-water cutoff should be tested at least weekly.
Low-water cutoff, slow drain test (steam boiler) – While the boiler is in operation, shut off the feedwater pump and slowly open the bottom blow valve to drain the water from the boiler. The low-water cutoff should shut down the burner before the water level goes out of sight low; if the burner does not shut off, restart the feedwater pump before the water level goes out of sight low and immediately troubleshoot the low-water cutoff to determine the cause of failure. The boiler must be under constant attendance by a properly licensed engineer at all times during this test.
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 goes out of sight low; if the burner does not shut off, restart the feedwater pump before the water level goes out of sight low and immediately troubleshoot the low-water cutoff to determine the cause of failure. The boiler must be under constant attendance by a properly licensed engineer at all times during this test.