very loud scary noise

[nick32]

dont know if ive posted in right section but here goes. for the past 2 days wen ive ran the cold tap upstairs in the bathroom (we have 2) and then turned it of theres a really loud awfull humming drilling sound that lasts for about 2 minutes before stopping,its that loud you can hear it down stairs, can anyone enlighten me as what could be causing it please.

 

[Whitespirit66]

Water hammer.

Have you changed anything on your plumbing?

Try adjusting the stop tap in your house as a first possible solution.

 

[nick32]

hi thnxs for reply. no not changed anything apart from replacing a outside tap last summer. what would u do with stop tap turn it up or down?

 

[heatingman]

ball valve on cold water storage tank needs looking at.

 

[nick32]

its cold water straight from the mains heatingman i think

 

[Whitespirit66]

hi thnxs for reply. no not changed anything apart from replacing a outside tap last summer. what would u do with stop tap turn it up or down?

Usually down.

May also be a problem with float valve in a toilet cistern.

 

[nick32]

thnxs funny u should mention toilet ,because the toilet in our ensuite makes a whisling noise for ages after u have flushed it.

 

[Whitespirit66]

Is the threaded screw on the side of the valve in contact with the inside wall of the cistern. If its not, the valve can bounce, giving your type of symptom.

Do you have an isolating valve on the pipe that feeds the cistern float valve. Try turning it off, and see if the noise is still there. If it isn't, you know that the float valve is suspect.

 

[nick32]

its also doing it when u have ran the shower then turn it off. when u run the taps on the sink its fine.just seems to be shower and bath,and just in the ensuite.

 

[nick32]

hi just wanted to let u know, found the problem,it was a loose pipe in the loft that was not clipped that was causing the noise.thnxs .