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

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.

Boiler water pH requirements vary, but the pH value of boiler water typically should be maintained between ___ to prevent scale formation.

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

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

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

A safety valve try lever test is performed with the boiler at a minimum of 15 psi or higher.

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 ___.

A tagout prevents the startup of equipment and serves as a warning to operating and service personnel.