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A common cause of explosion is the runaway firing condition that takes place when the boilers burner does not shut off. In this case, when the hot-water heater is connected to the city water supply on one side and the building hot-water service on the other, the check valve will shut off and no back pressure will go into the city side.
The attack concentrates on areas of stress within the boiler such as: rolled tube ends, baffle edges, tube welds, threaded members, and other non-stress relieved areas. Here again, proper monitoring of the boiler water treatment program dosages and residuals can prevent this type of problem.
A Boiler: The Explosive Potential of a Bomb
Stress corrosion cracking at the lap joints was a common cause of early boiler explosions, probably caused by caustic embrittlement. The water used in boilers was not often closely controlled, and if acidic, could corrode the wrought iron boiler plates.
Caustic embrittlement (caustic stress corrosion cracking), or intercrystalline cracking, has long been recognized as a serious form of boiler metal failure. Because chemical attack of the metal is normally undetectable, failure occurs suddenly-often with catastrophic results.
A safety valve is a valve mechanism for the automatic release of a substance from a boiler, pressure vessel, or other system when the pressure or temperature exceeds preset limits. It is part of a bigger set named pressure safety valves (PSV) or pressure relief valves (PRV).
One is the boiler /machinery (B/M) coverage for the pressure side, meaning the tubes, drums, water level controls and safety relief valves. The second part of a boilers insurance is the property coverage, which covers the fire side, such as the fuel train, firebox, and refractory-related issues.
Top Ten Boiler and Combustion Safety Issues to Avoid