In wet layup, the water side must be dry to prevent corrosion and pitting from residual moisture.

Even in full open position, a ___ valve causes steam to change direction through the valve, resulting in a drop in steam pressure.

When released to the atmosphere, refrigerants can cause frostbite to unprotected skin and freezing of the eyes, and they can create environmental problems in the form of ozone depletion and global warming.

Corrosion is the accumulation of sludge on boiler heating surfaces.

Hot water heating systems produce heat more consistently than steam heating systems.

Boilers equipped with a quick-opening valve and a slow-opening valve must have the quick-opening valve closest to the boiler shell.

Hot water heating systems produce heat more consistently than steam heating systems.

Steam traps are ___ devices that increase overall system efficiency by removing air and condensate without the loss of steam.

___ -pipe systems are used when different parts of a system require heating and cooling simultaneously.

Makeup water is always added from a city water supply line with a manual makeup water system.