Author: Anonymous

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.

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.

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.

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

A blowdown valve should be kept open long enough for the water level in the gauge glass to drop out of sight.

A blowdown valve should be kept open long enough for the water level in the gauge glass to drop out of sight.

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