___ are pollution standards for six priority pollutants set by the Environmental Protection Agency through the Clean Air Act.

A variable-speed drive (VSD) is a motor controller used to vary the frequency of the electrical signal supplied to an AC motor in order to control its rotational speed.

Surge tanks are vented to the atmosphere and commonly lined with an epoxy coating to prevent corrosion.

The mercury tube in a pressure control must be inspected at least ___ for mercury vaporization.

The words “stack” and “chimney” are often used interchangeably when referring to the structure used to direct the flow of gases of combustion from a boiler to the atmosphere.

The two types of draft produced in a boiler are mechanical and forced.

A thermodynamic steam trap opens and closes by a single ___ that rises to allow the discharge of air and cool condensate.

Water transports heat more efficiently with less temperature loss over distances than air.

An automatic makeup water system on a small low pressure boiler connected to the city’s water supply uses an automatic makeup feeder located slightly below the NOWL.

Water transports heat more efficiently with less temperature loss over distances than air.