Basic Copper and Plastic Piping Practices

Which type of plastic piping can be threaded?

• Schedule 80 PVC

• Schedule 40 PVC

• PEX

• Schedule 40 CPVC

Answer explanation

3.1.5

Plastic pipe cements take longer to cure in hot weather.

• True

• False

Answer explanation

3.2.2

In wet environments, the listed curing times for PVC solvent-cement joints should be extended

• 20 percent

• 35 percent

• 50 percent

• 65 percent

Answer explanation

3.2.2

The organization that establishes manufacturing standards for copper tubing is _____.

• ASHRAE

• SAE

• CDA

• ASTM International

Answer explanation

1.1.0

As the wall thickness of copper tubing increases, the inside diameter of the tube decreases.

• True

• False

Answer explanation

1.1.1

One reason to use a tubing cutter instead of a hacksaw to cut copper tubing is that _____.

• it does not create a ridge inside the tube edge

• stronger joints will result

• the tubing can be cut off at any angle

• tubing cutters do not create loose filings

Answer explanation

2.1.2

Which of the following statements about push-to-connect fittings for copper tubing is correct?

• Push-to-connect fittings are not rated for the common pressures found in a refrigerant circuit.

• Some push-to-connect fittings come with a release tool for easy removal.

• Push-to-connect fittings are designed to be reused many times.

• Push-to-connect fittings must be made from steel.

Answer explanation

2.3.2

Swaging a copper tube prepares it for a sound, reliable fit with a compression ferrule.

• True

• False

Answer explanation

2.1.4

The pressure-relief valve on a nitrogen pressure test set should be set to relieve pressure at _____.

• the maximum safe working pressure of the tubing being tested

• at a pressure 50 percent higher than the required test pressure

• 1 or 2 psig above the required test pressure

• the maximum working pressure of the nitrogen regulator

Answer explanation

2. 2.4.0

Which plastic product is the most widely used flexible product in the plumbing industry?

• PEX

• PVC

• ABS

• CPVC

Answer explanation

3.1.2