Neil Revollo
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Expansion Tanks

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Neil Revollo
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Chapter 12 - Quiz

Question 1 of 20

1

In systems that are open to the atmosphere, such as a non-pressurized thermal storage tank, the volume increase of heated fluid is accommodated by an expansion tank.

Select one of the following:

  • True
  • False

Explanation

Question 2 of 20

1

One inherent problem with standard expansion tanks is that the air and water they contain are in direct contact.

Select one of the following:

  • True
  • False

Explanation

Question 3 of 20

1

The air in a standard expansion tank is initially at atmospheric pressure.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 20

1

Standard expansion tanks typically need to be drained and refilled with air at least once each year.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 20

1

Many of the shortcomings of standard expansion tanks can be avoided by separating the air and water in an expansion tank.

Select one of the following:

  • True
  • False

Explanation

Question 6 of 20

1

The entire volume of system fluid reaches the maximum fluid temperature simultaneously.

Select one of the following:

  • True
  • False

Explanation

Question 7 of 20

1

Most modern diaphragm-type tanks use a butyl rubber or EPDM diaphragm.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 20

1

It is good practice to install a pressure-regulator valve near the inlet of any expansion tank.

Select one of the following:

  • True
  • False

Explanation

Question 9 of 20

1

The expansion tank should always be connected to the system near the outlet port of the circulator.

Select one of the following:

  • True
  • False

Explanation

Question 10 of 20

1

Many systems with chronic "air problems" can be corrected by simply rearranging the piping so that the circulator pumps away from the point of no pressure change.

Select one of the following:

  • True
  • False

Explanation

Question 11 of 20

1

In a typical closed-loop hydronic system, the extra space caused by heated liquid is usually provided by a separate chamber called the expansion tank. This tank contains a volume of __________ that is compressed.

Select one of the following:

  • air

  • gas

  • water

  • sludge

Explanation

Question 12 of 20

1

A software module called Expansion Tank Sizer in the Hydronics Design Studio software is an aid for determining tank size and __________.

Select one of the following:

  • placement

  • pressurization

  • type

  • brand

Explanation

Question 13 of 20

1

When __________ occurs, there is no longer a cushion of air for the system's water to expand against.

Select one of the following:

  • waterlogging

  • deaeration

  • thermal shutdown

  • hydraulic separation

Explanation

Question 14 of 20

1

The static pressure at the expansion tank connection when the system is filled is based on the height of the system piping above the expansion tank, the type of fluid used, and a customary allowance for __________ psi pressure at the top of the system for proper operation of the air vents.

Select one of the following:

  • 1.5

  • 3.33

  • 5.0

  • 7.5

Explanation

Question 15 of 20

1

In a diaphragm-type expansion tank, since the diaphragm separates the fluid from the air, the air __________ the fluid.

Select one of the following:

  • cools

  • easily combines with

  • is proportional to

  • cannot be reabsorbed by

Explanation

Question 16 of 20

1

A properly sized diaphragm-type expansion tank allows the pressure relief valve to reach a pressure of about __________ psi lower than its rated opening pressure when the system reaches its maximum operating temperature.

Select one of the following:

  • 1.25

  • 3.33

  • 5.0

  • 6.66

Explanation

Question 17 of 20

1

Expansion tanks have maximum pressure and temperature ratings. This information is stamped on the label of the tank. Typical ratings are __________ psi and 240ºF.

Select one of the following:

  • 5.0

  • 60.0

  • 25.0

  • 86.0

Explanation

Question 18 of 20

1

The __________ fixes the pressure of the system's fluid at its point of attachment to the piping. This is called the point of no pressure change.

Select one of the following:

  • circulator

  • heat emitter

  • expansion tank

  • diaphragm

Explanation

Question 19 of 20

1

When __________ circulators are used, the header they connect to should be located close to and just downstream from the point where the expansion tank is connected.

Select one of the following:

  • multiple zone

  • variable speed

  • hydraulic

  • single zone

Explanation

Question 20 of 20

1

It is __________ to install two or more expansion tanks at different locations within a system.

Select one of the following:

  • standard procedure

  • a manufacturer's recommendation

  • not advisable

  • the user's requirement

Explanation

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