On 22/02/2017 15:04, Andrew wrote:
On 22/02/2017 14:02, Chris Hogg wrote:
On Wed, 22 Feb 2017 12:33:00 +0000, GMM wrote:

I know this is an outrage and I should be hung drawn and quartered for
even contemplating it but needs must (!)

I have an old 6-foot single radiator in the bathroom which is beyond the
end of its life and showing (since yesterday) a small rust hole/leak.

big snip

Stuff all that!

If you're only after a temporary bodge ATM, see the recent thread
started by Road Hog on the 21st Feb on repairing a pinhole leak in a
radiator. The best solutions IMO were to patch it with a bit of
plumbers putty, which will stick to wet surfaces and 'goes off' after
being kneaded, or the other solution, to use a self-tapping screw in
the pinhole, probably with some sealing compound in the thread as
well, and remembering to shut both valves on the rad while the putty
or whatever is hardening. Either are quick and easy solutions, to tide
you over for the refurb later in the year, and much simpler than the
complex arrangement you seemed to be planning.


When one pin hole appears, you can bet that a few dozen more are
lurking..

I would change the rad. One end can use the existing lock shield
fitting, and on the other side just fit an inline trv or lockshield
so the compression outlet/inlet is horizontal. Just use a length
of copper tube horizontally to reach the existing vertical pipe
which will have an olive previously used to connect to the
original 90 degree trv or lockshield. Use a 90 degree compression
instead.


Except that the OP wants to avoid any draining down - so that means that
the valves need to remain in their original positions.

In my previous post I had assumed that the OP wanted the temporary
replacement radiator in the middle of the gap left by the longer
original - probably because he mentioned pipes (in the plural) for
extending the reach of the valves.

But if it's acceptable to put the replacement rad at one end or other
rather than in the middle, the existing tail, etc. can be used that end
- only requiring the other end to be extended.
--
Cheers,
Roger
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