Key Points Flashcards
Safety valve capacity is the amount of steam in pounds per hour that the safety valve is capable of venting at its rated pressure
True
According to the ASME boiler and pressure vessel code, a try lever test should be performed every 30 days the boiler is in operation
True
The safety valve try lever test should be performed at a minimum of 5 psi on a low pressure boiler
True
A pop test is performed to determine if a safety valve opens at the proper pressure withing allowable tolerances
True
A steam pressure gauge displays the amount of steam in a boiler
True
Hydrostatic pressure is the weight of water (0.433 psi per vertical foot)
True
A siphon provides a water seal to prevent contact with live steam
True
Water should never be added to the boiler if water is not present in the gauge glass. Adding water to a boiler with a low water condition could cause a boiler explosion
True
A boiler should never be dumped when hot
True
Foaming caused by surface impurities can lead to priming and carryover
True
Some large boilers require a continuous blowdown
True
A fusible plug is a warning device used to indicate extreme overheating of the boiler from a low water condition
True
A pressure control is a switch that starts the burner, controls the firing rate, or shuts down the burner based on steam pressure
True
An operating control initiates the burner start-up sequence and burner shut-down sequence as required
True
A high limit control senses steam pressure and automatically shuts down the burner if the operating limit control fails
True
A modulating control controls the firing rate of the burner
True
If the heat exhanger design allows for fluids to be trapped withing the heat exchanger, the heat exchanger must be protected from overpressure by a thermal expansion safety relief valve or a rupture disc
True
