Capillary Types of Joints

Joints form a very important part of plumbing work, as they are the things that hold the pipework together, ensuring that water, gas or other liquids do not spill or leak out, causing major problems and even risk to life. The capillary joint is one of them, and takes a couple of forms. It basically works by melting solder so that it runs into the join in an action called capillary and then cools, making a tight waterproof joint. Ilford Plumbers use capillary joints for their pipework.

Note: Capillary action is when a liquid flows in a narrow space without the affects of gravity influencing it.

On the shelves of your local merchant, you should displayed see a couple types of capillary joints.

These are below:

End-feed.

This joint has solder applied to it when hot to make the joint. You’ll know when the temperature is correct because the solder will melt and flow over the joint like water. Dab the solder into the joint until you see it start to gather at the bottom of the joint, but do not use so much that it drips. Always allow the joint to cool fully before trying to move. An Ilford Plumber uses this type of joint.

Yorkshire.

These are called self-soldering, as they include a ring of solder inside the end of the fitting, and require heating with a blowtorch. The end of the pipe should be cleaned on the inside of the joint with wire wool. Smear a little flux paste inside the joint and on the end of the pipe. Press the joint together, and ensure that the pipe is home firmly. Using a small pencil mark, you can check if any movement occurs. With a blowtorch, apply heat to the pipe and its joint, until you see a fine silver ring of solder and that’s when the pipe has made the joint. Use extra solder if required.