An entry permit must be posted at confined space entrances or otherwise made available to entrants before entering a permit-required confined space.

Chemical treatment changes calcium and magnesium into nonadhering sludge to prevent scale buildup.

An entry permit must be posted at confined space entrances or otherwise made available to entrants before entering a permit-required confined space.

High-efficiency condensing boilers may use steel or ___ stacks because of the low stack temperatures in these types of boilers.

The liquid line is a refrigerant line that carries the warm, high-pressure liquid refrigerant between a condenser and a metering device.

As the pressure increases in a boiler, the boiling and condensing point of the water decrease.

A(n) ___ is not intended for hot water service.

If plant conditions do not warrant a(n) ___, then a package feedwater system is commonly used.

A ___ is a hot water boiler accessory resembling a piping tee that meters water flow from the supply line to the heating unit.

If plant conditions do not warrant a(n) ___, then a package feedwater system is commonly used.