Chapter 13 - Quiz

If properly designed, a closed-loop hydronic system should rid itself of most air within a few days of initial start-up.

The oxygen that causes corrosion is the same oxygen that forms water molecules.

Circulators transfer maximum head energy to incompressible fluids (e.g., liquids). A mixture of water and air is an example of an incompressible fluid.

Air has much lower specific heat and density than water.

Circulators with internal spring-load check valves installed in vertical piping with upward flow are especially susceptible to air pockets.

Although water may appear perfectly clear and free of bubbles, it can still contain a significant quantity of air in solution.

Combined air and dirt separators, or a hydraulic separator with the same capabilities, are never desirable in situations where an older distribution system containing steel or iron piping or radiators will be interfaced to a new boiler.

Properly designed and installed hydronic systems will always require constant manual air venting.

Low system pressurization is usually caused by not setting the make-up water system properly.

Glycol-based antifreezes tend to leave a slippery film on components and tools that eventually turn sticky.

Flow noise is generated when dissolved gases are released from improperly deaerated fluid due to a __________ in pressure.

Air contains oxygen, and oxygen in contact with ferrous metals creates __________.

A large pocket of air trapped within a system can totally stop flow. This effect is often called air _________.

Dissolved air can also lead to gaseous cavitation. Gaseous cavitation occurs when the pressure on the fluid __________ the saturation pressure of the dissolved gases it contains.

When air exists as bubbles, a moving fluid may be able to carry them along through the system. This is called __________ air.

The air removal devices used in small hydronic systems can be classified as either high point vents or __________.

The need for fully automatic (unattended) venting in locations not easily accessed requires a different type of device. A(n) __________ air vent often provided the solution.

A(n) __________ is capable of maintaining the system fluid in an unsaturated state of air solubility. This means that the water is always ready to absorb additional air from any areas of the system where it may be present.

A device that makes short work out of filling and purging residential and light commercial hydronic systems consists of a minimum 1-horsepower swimming pool pump mounted on a 30-gallon plastic trash barrel. This device is called a(n) __________.

An automatic fluid feeder uses a small positive displacement pump operated by a pressure sensing switch to automatically pump fluid into the system when the pressure __________ a set minimum value.