BOILER STEAM DRUM SAFETY VALVE
Boilers are designed for a certain maximum operating pressure. If this pressure is exceeded, there is danger of an explosion unless this pressure is relieved. This danger is so great that it necessitates equipping all boilers with safety valves to maintain the boiler pressure within design limits. safety valve setting is a statutory requirement. as discussed above, there are safety valves. one is installed at super heater out let and other two are placed at steam drum . super heater safety valve is set at lower pressure than drum safety valve.
to set these safety valves boiler is light up . the safety valve to be set is kept on service and other two are gagged. pressure on the boiler is raised slowly as per normal operation procedure of boiler . fuel feeding rate is kept at minimum. the safety valve is required to lift and reset at desired pressure at per boiler pressure rating. accordingly it is adjusted to get the lift and reset pressure.
like this all the three safety valves are set. all the gagging are removed. percussion is to be taken during initial build up. the drum pressure gauge should be perfect and calibrated. if the safety valve does not lift beyond the set pressure then the pressure of the boiler is to be reduced and setting to be done again.
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