In general, the depth of a swagged copper joint should be approximately what proportion of the tube size?

The correct answer is that the depth of a swagged copper joint should be approximately the same as the diameter of the tube. This specification is critical for ensuring a secure and effective connection when joining copper tubing.

When making a swagged joint, the depth of the swag should match the diameter of the tube because this provides sufficient surface area for soldering and allows for a complete fill with solder, which enhances the strength of the joint. A properly swagged joint that adheres to this guideline helps prevent leaks and ensures reliability in the HVAC system.

Using the diameter as a measurement reflects the need for a connection that matches the physical characteristics of the tube, allowing for optimal conductivity and fluid flow within the system. This standard is part of good practice in HVAC installations, ensuring that joints are made safely and effectively while also complying with industry standards.