Routing all pipes together?

[walls4fingers]

my house was originally fitted with night storage heaters and emersion heaters. The previous owners decided to fit a boiler in the garage which is below our bedroom floor. We get noise through the pipes when the boiler changes from DHW to CH. I took up the floor in our bedroom to find pipes layed as the picture shows.
My question. Is this really advisable running a cold water pipe so close to heating and hot water pipes?

Untitled

• walls4fingers
• 11 Jan 2009
• 1

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[rebuke]

I'm not an expert, but I wouldn't have thought running them virtually touching is a good idea, given that pipes expand/contract by small amounts as they heat up / cool down, I would think that they're likely to make contact with each other in various ways - generating noise etc.

I know in my house while I have a similar set of pipework, each pipe is spaced out from the others by a small amount...

 

[walls4fingers]

im not 100% convinced it is the pipes making the noise. just concerned about not being very efficient. its probably like this for about 30 feetish

 

[powell30]

Ideally a 50m gap should be in situ where you run hot and cold water pipes in tandem. That said it is possible that when they are expanding it is cause of your noise.

 

[walls4fingers]

Thanks for that. i might widen the notches in the joists to allow me to insulate the pipes. Its like a knocking noise for about 5 second. you can hear it when you stand next to the boiler, but it is noisier in the house

 

[leakydave]

How well were the pipes clipped? If too loose they can bang and rattle. As they are so close together they could be difficult to clip.

 

[walls4fingers]

How well were the pipes clipped? If too loose they can bang and rattle. As they are so close together they could be difficult to clip.

There havent got any clips. Do you think i should clip them?

 

[Bahco]

I would clip them and space them about 20 mm from each other.

 

[blondini]

Before doing anything...

What kind of noise is it?

 

[Fluffster]

I would be careful notching out more of your joists as I would say they have already exceeded the prescribed limits.
Pete

 

[kirkgas]

another problem is condensation forming on the cold pipe due to being in between two hot ones,

 

[blondini]

another problem is condensation forming on the cold pipe due to being in between two hot ones,

I'd have thought that condensation on the cold pipe was less likely due to it being warmed by the proximity of the heating pipes.

 

[kirkgas]

i was always taught when running domestic pipes round walls to fit the hot above the cold with a 40mm gap to minimise condensation forming on the cold, so it does happen, if the incoming main is very cold and the heating flow is very warm i think condensation would form, but i'm sure others will agree with one of us and give pelters to the other

 

[Onetap]

another problem is condensation forming on the cold pipe due to being in between two hot ones,

 

[walls4fingers]

Before doing anything...

What kind of noise is it?

It is hard to discribe. sort of nocking. sounds exactly the same as the divertor valve if you know what i mean.
when the boiler is heating CH and you turn on the tap, you get a bang, sounds like pipe hammer. then the nocking noise. when you stop the tap the boiler stops, starts to nock. then carries on with heating.
the nocking is very predictable sounds the same every time.
Before anyone adds how i can discribe this so well. try listening to it at 3 in the morning!