Pipe noise near stopcock

[gselliott]

Yes it's fully open.

 

[Best]

Might be difficult to do, but if all else fails maybe you could have the stopcock disconnected from rest of house and join a temporary pipe leaving it, to outside, to see if noise still there.
Normally grit in pipework or stopcock faulty or not fully open.
Do you know if you have a pressure reducing valve anywhere on mains?
If you still find noise you could ask your water company to check their end outside the property.

 

[gselliott]

The stopcock was replaced a couple of months ago as it was leaking, the noise was there before it being replaced but I'm just getting round to getting to the bottom of it now.

As far as I'm aware there isn't a pressure reducing valve anywhere, if I got the water company out to have a look at their end and don't find an issue are they likely to charge me?

 

[Best]

The stopcock was replaced a couple of months ago as it was leaking, the noise was there before it being replaced but I'm just getting round to getting to the bottom of it now.

As far as I'm aware there isn't a pressure reducing valve anywhere, if I got the water company out to have a look at their end and don't find an issue are they likely to charge me?

Not sure, but in N.I. where I am, the water authority are very decent and never charge for anything like that. Ring your local water authority to ask if they charge for investigating their end, if you do decide to get them

 

[gselliott]

Thanks for the reply, I'll give them a call and see what they say!

 

[zzzjim]

If the rooms are well heated / pipework poorly lagged , and pipe work is getting warm ,
are you hearing the pipe work contracting with incoming cool water ?
-- hence happens once then goes away , comment -
( this will be a quietish noise -with Radio /TV playing , but in a empty lightly furnished room with no background noise -Quite over powering )
... Like some one tapping a metal ring , or wooden stick against a bare pipe 2 times a sec....

(other thought a hard piece of debris ratting in a horizontal to vertical portion)
(due to flow turbulence -- any saddle clamp -pipe piercing kits anywhere )

 

[gselliott]

. Like some one tapping a metal ring , or wooden stick against a bare pipe 2 times a sec.

This is probably the best description of the noise

 

[zzzjim]

...difficult..maybe......stopcock disconnected from rest of house and join a temporary pipe leaving it, to outside,

I'm thinking of a variation , small debris(snots) after stop tap , is it all soldered , or do you have any compression pipework joins wherepipe work can be seperated past internal stopcock ?
Flush out with "Best's" technique !

 

[Chuck]

It sounds more like a tapping than a banging but it's really fast.

Water coming in from the main supply is colder than the pipework inside the house. What you're hearing is probably a longish run of cold pipe contracting, pulling back through a hole. The clicking is the slip-stick process occuring due to friction at the hole.

 

[gselliott]

Zzzjim – yes there are compression joins in the pipework past the stopcock, what is “Best’s technique”?

Chuck – So you mean there is an issue on the supply side between the house and the main in the street?