A flame scanner sensing device that contains lead sulfide is used to detect infrared light.

The ASME Boiler and Pressure Vessel Code requires at least one water column on all boilers.

A flame scanner sensing device that contains lead sulfide is used to detect infrared light.

Balancing the water flow in a two-pipe reverse-return system is much easier than in other types of systems because the resistance to the water flow is the same for all heating units.

Hot water boilers use ___ instead of the bottom blowdown valves used with steam boilers.

The nonflammable material used to insulate the outer surface of a boiler from heat is ___.

The scales used on diaphragm gauges vary from hundredths of an inch to several inches of ___, depending on the pressure being measured.

___ is the exposure to highly alkaline elements, causing boiler metal corrosion at stress zones.

A mercury-tube pressure control is a pressure control that regulates a burner control circuit by the flow of mercury in a mercury tube.

The nonflammable material used to insulate the outer surface of a boiler from heat is ___.