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?

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

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

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

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

<p>The tapered mandrel within the tool (A)</p> Signup and view all the answers

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

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

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

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

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

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

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