A nonreturn valve is a type of globe valve that allows a boiler to be cut in on-line automatically when the boiler pressure is at or above the header pressure and allows the boiler to be taken off-line automatically if the pressure in the boiler drops below the header pressure.

An electrical safety policy must include the use of PPE.

The primary regulatory requirements related to electrical safety come from NFPA 70E®, Standard for Electrical Safety in the Workplace.

The ___ of a modulating burner is the ratio of the maximum firing rate to the minimum firing rate.

The ___ of a modulating burner is the ratio of the maximum firing rate to the minimum firing rate.

The primary regulatory requirements related to electrical safety come from NFPA 70E®, Standard for Electrical Safety in the Workplace.

An electrical safety policy must include the use of PPE.

A face mask is a personal protective equipment device that provides respiratory protection from airborne contaminants.

___ in boiler water causes corrosion and pitting of the boiler metal.

A(n) ___ regulates the firing rate between high and low fire of a burner.