you have air in the system you need to bleed the air out at the radiators at the end of each rad is a hex bolt you need a rad key available from any plumbers Maybe I should clarify...there is no radiator. There is a pipe that ticks when water drains down my bathroom sink, toilet or kitchen sink. (same pipe, same location) Expansion and conraction. Especially ABS and PVC pipes touching wood or sheetrock.
A plumber
Lag
The drain metal pipes are usually coated and galvanized because of the hard water.
Lag
choir members in your pipes
The shower gurgles because the water is going down the pipes.
Singing water pipes can be caused by air that is trapped in the pipes. The air can cause a whistling or singing sound, or it can cause the pipes to knock or rattle.
I had a water pipe break on a Friday afternoon, when I was expecting company the next day. I called Drains N Pipes and they were able to come out and repair my pipe immediately. The plumber they sent was very nice and had my pipes repaired and was out the door in under an hour. The rate they charged was fair and I am very happy with their service. I will be recommending Drains N Pipes to all my friends.
Lag
yes and if it is frosty and the water is left dripping you can also get ice forming in your drains.
Plug waste, gully, traps, waste pipes, waste pumps.
Salt water cause corrosion on most metal pipes.