Radiator pipe warping

[chris891]

Hi, I recently fitted a radiator in my kitchen using speedfit piping. Everything seems to work ok but when the heating is on one of the pipes begins to warp. At first I thought it was because the pipe needed cutting down so I shortened it a little but still have the same problem. The pipe running into the radiator doesn't it, only the one coming out. Is it something as simple as using extra wall fasteners or something else?

 

[endecotp]

It does that. You need a lot more clips.

https://www.johnguest.com/sites/jg/files/2024-08/JG%20Speedfit%20Technical%20Specs%20Guide%20July%202024.pdf

Page 18 has recommended clip spacing. See also p20 which mentions boxing-in as another option.

Or use copper!

 

[chris891]

Brilliant, thanks for the quick reply. I was hoping it was just a case of more clips but found it weird it was only happening on one side.

Luckily I've got a bag of those clips, thanks again for the help!

 

[Elkato531]

FYI, those speedfit iso valves are not designed for heating systems. They are not rated for the sustained high temperatures or the chemicals and impurities in the water. They will almost certainly leak if used in the future and may well start to leak without being used.

 

[chris891]

Thanks for letting me know, those were already there so I carried the job on from that point but I'll look into replacements now you've mentioned it.

RE the warping - after fitting extra clips that pipe still warps even though the other doesn't, I also noticed that the warping pipe vibrates a little when the heating is on and the other doesn't.
I might try looking at the valve or if the radiator, if not I'm guessing it's something with the pipe itself?

 

[Why Not Indeed]

that pipe still warps even though the other doesn't

If the radiator actually works then the flow pipe should be hotter than the return. That could explain the difference.

 

[chris891]

Radiator works but weirdly the pipe that is warping is the return pipe.