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A scratch on the inside of a gauge glass can cause it to break.

Flash gas is a refrigerant that boils off and cools liquid refrigerant when some of the refrigerant molecules absorb heat from the other refrigerant molecules.

A safety valve prevents backflow to a fuel tank from a fuel oil system.

Boiler layup is required when a boiler is out of service between shifts.

To protect pressure gauges from the damage caused by pressure surges, ___ can be used.

___ weakens the metal and shortens the life of a boiler.

A safety valve prevents backflow to a fuel tank from a fuel oil system.

A therm is the quantity of gas required to produce 100,000 Btu.

Procedures commonly performed and logged during a shift include water column and gauge glass blowdown, bottom blowdown, low water fuel cutoff testing, and flame scanner testing.

Before dumping a boiler, the boiler heating surface should be ___.