Banging pipes - types of banging

[Richard Fangnail]

I have tapping noise from the heat system in my apt building. I know what causes it. The pipes are expanding from heat.

For many years I heard a fast series of clicks every 30-60 minutes or so, but lately, I've been hearing a "slow tapping," which is one CLICK and then five seconds of silence and then another CLICK. This lasts

1-2 minutes.

Do you know why this "slow tapping" would happen as opposed to the old tapping?

[Oren]

Somebody loves you. Are these two taps?

-- Oren

"The voices in my head may not be real, but they have some good ideas!"

[Doug Miller]

Same cause.

Pipe hangers are older, and now have enough corrosion on them to create enough friction that the pipe doesn't slide more-or-less smoothly through them like it used to. Now, it moves in a series of jerks.

Try putting a little bit of grease at every point where a pipe is in contact with a pipe hanger.