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Mechanical Joints for Piping Systems

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Questions and Answers

What is the property of PEX tubing that allows it to return to its original diameter when partially expanded?

Elasticity

Conductivity

Shape memory (correct)

Durability

How is a cold-expansion joint formed using PEX tubing?

By slipping a reinforcing PEX ring over the tube end and using a hydraulic expander tool (correct)

By heating the tube ends with a torch

By using adhesive to connect the tube ends

By welding the tube ends together

What type of mandrel does the hydraulic expander tool have for creating a cold-expansion joint with PEX tubing?

Serrated face mandrel (correct)

Curved mandrel

Square-shaped mandrel

Smooth cylindrical mandrel

What purpose does chamfering serve in preparing PEX-AL-PEX tubing for cold-expansion fittings?

Ensuring a consistent diameter and reducing force required for fitting insertion (D) Signup and view all the answers

What effect does chamfering have on the aluminum layer of a PEX-AL-PEX tube?

It trims it back so that it does not touch the brass in the fitting (A) Signup and view all the answers

Which part of the expansion tool creates the expansion force in PEX tubing connections?

The tapered mandrel within the tool (A) Signup and view all the answers

Why do cold-expansion fittings use a split-tapered mandrel with serrated faces?

To prevent slipping off the tube during expansion (D) Signup and view all the answers

What is the primary advantage of using cold-expansion connections with PEX tubing?

'Shape memory' property of PEX tubing (B) Signup and view all the answers

What does the special tool do when chamfering the inside surface of PEX-AL-PEX tubing?

'Truing' the end of the pipe for consistent diameter (D) Signup and view all the answers