Vibrating central heating pipes

[Chris Travers]

I've just replaced a radiator after draining down system. The system has had a bit of a hum for a while but is know vibrating really bad enough for us to worry about the neighbours.
I've just put in another dose of calmag which has improved it (2 litres in total) but I can't leave the speed on 2 as its too noisy, even 3 is better, it's on 1 at the moment
The pump is a wilo. I used to have an old 2nd hand grunfoss that gave me no trouble but the gas engineer changed it when I had the boiler changed about 10 years ago
My question is would a change of pump resolve the problem

Thanks in anticipation

 

[Riley]

It sounds more like an air issue to me

 

[Chris Travers]

Thanks for quick reply. I've done all the usual bleeding, rads all hot to the top and 2 air eliminators in airing cupboard doing their job. It's an open vent system with 2 zone valves (ch/hw). The pump doesn't seem to be sucking air.
I'm tempted to change the pump but reluctant in case I'm wrong

 

[Last Plumber]

It depends on what is causing the vibration.
Do you have TRV's (Thermostatic Radiator Valves) and if so are they on the correct side?
I know some are bi-directional, just an initial thought!

 

[Riley]

Have you bled the pump

 

[Chris Travers]

Yes one trv is wrong but the rad is off as its in a spare room, I've bled the pump till water dribbles out
The noise still happens on HW heating with CH off

 

[Riley]

How dirty was the water when drained

 

[Chris Travers]

How dirty was the water when drained

Quite good really, the magnaclean needed to be done though

 

[Riley]

How grubby was that

 

[townfanjon]

I have to ask , is it the right way round ?

 

[Chris Travers]

Just checked on a couple of accessible pipes, if I put a little pressure on them the noise is muted a lot. I can clip them the the wall but still feel the vibes

How grubby was that

quite thick but hadn't been done for a while

 

[Chris Travers]

I have to ask , is it the right way round ?

It's in the airing cupboard with arrow pointing away from the boiler. Is that right?

 

[townfanjon]

Should point towards your , either 3 port valve or two 2 ports .

 

[Chris Travers]

Should point towards your , either 3 port valve or two 2 ports .

It does cheers