I shall shortly need to re-do the waste pipe from a bathroom (bath and
basin - not toilet) and some of the joints are going to end up in a
space which will become inaccessible thereafter. I therefore need to use
solvent weld joints in this location because I can't risk push-fit
joints leaking or coming apart.

Having not used solvent weld very much - the last time was over 30 years
ago! - I can't remember how long it takes for a joint to become
unmoveable. If I assemble a joint, and need to (say) rotate an elbow for
alignment purposes, how long have I got before it becomes impossible?

If I use push-fit for all the accessible bits, what's the trick for
joining push-fit and solvent weld pipes - because, AIUI, the pipe
diameters are likely to be slightly different?
--
Cheers,
Roger
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On 01/06/2010 12:27, Roger Mills wrote:
I shall shortly need to re-do the waste pipe from a bathroom (bath and
basin - not toilet) and some of the joints are going to end up in a
space which will become inaccessible thereafter. I therefore need to use
solvent weld joints in this location because I can't risk push-fit
joints leaking or coming apart.

Having not used solvent weld very much - the last time was over 30 years
ago! - I can't remember how long it takes for a joint to become
unmoveable. If I assemble a joint, and need to (say) rotate an elbow for
alignment purposes, how long have I got before it becomes impossible?

No time at all, basically. Best plan is to assemble it all dry, then
mark the joint alignments with a pen or something before gluing it.

On 1 June, 12:27, Roger Mills wrote:
I shall shortly need to re-do the waste pipe from a bathroom (bath and
basin - not toilet) and some of the joints are going to end up in a
space which will become inaccessible thereafter. I therefore need to use
solvent weld joints in this location because I can't risk push-fit
joints leaking or coming apart.

Having not used solvent weld very much - the last time was over 30 years
ago! - I can't remember how long it takes for a joint to become
unmoveable. If I assemble a joint, and need to (say) rotate an elbow for
alignment purposes, how long have I got before it becomes impossible?

If I use push-fit for all the accessible bits, what's the trick for
joining push-fit and solvent weld pipes - because, AIUI, the pipe
diameters are likely to be slightly different?

use compression if push fit won't take the pipe?

Cheers
Jim K

On 01/06/10 12:27, Roger Mills wrote:
I shall shortly need to re-do the waste pipe from a bathroom (bath and
basin - not toilet) and some of the joints are going to end up in a
space which will become inaccessible thereafter. I therefore need to use
solvent weld joints in this location because I can't risk push-fit
joints leaking or coming apart.

First check if you are jointing ABS (most likely) or (m)uPVC (less
likely with smaller pipes but possible). If in doubt, get a dual
ABS/uPVC cement which is what I use (I was jointing 110 uPVC as well as
40/50mm ABS).

Having not used solvent weld very much - the last time was over 30 years
ago! - I can't remember how long it takes for a joint to become
unmoveable.

About 5-10 seconds! Full strength in a few hours.

If I assemble a joint, and need to (say) rotate an elbow for
alignment purposes, how long have I got before it becomes impossible?

Dry fit, then mark a line across both bits of every joint. When it's
right, go back and cement them. Wipe the surfaces with meths/IPA/other
solvent before applying cement. Sandpaper the old pipe first as that
will be excessively cruddy compared to new stuff. Ensure any paint is
removed.

If I use push-fit for all the accessible bits, what's the trick for
joining push-fit and solvent weld pipes - because, AIUI, the pipe
diameters are likely to be slightly different?

The official way would be to use a universal compression fitting - but
as that has some risk of coming apart (bugger all in reality, but as you
are too worried to use pushfit...) you could slaver it up with Fernox
LS-X (plumbers silicone) for extra confidence. However, if the pipes in
question are a reasonable (not sloppy) fit in the solvent weld adaptor,
weld them regardless provided the plastics are weldable (I *think* most
pushfit is also ABS??).

I have had solvent fit from different manufactures either be tight or
quite loose but in both cases, they welded OK (apply generous cement to
both parts if sloppy).

Cheers

Tim
--
Tim Watts

Hung parliament? Rather have a hanged parliament.

On Tue, 01 Jun 2010 12:27:20 +0100, Roger Mills wrote:

I shall shortly need to re-do the waste pipe from a bathroom (bath and
basin - not toilet) and some of the joints are going to end up in a
space which will become inaccessible thereafter. I therefore need to use
solvent weld joints in this location because I can't risk push-fit
joints leaking or coming apart.

Having not used solvent weld very much

Do make sure you get a solvent weld pipe, your bog-standard pipe from the
sheds doesn't take solvent weld at all. It's also worth noting that you can
get a gap-filling solvent paste as well as ordinary solvent weld.

--
The Wanderer

Statistics show that statistics can't be trusted.

On 01/06/10 14:18, The Wanderer wrote:
On Tue, 01 Jun 2010 12:27:20 +0100, Roger Mills wrote:

I shall shortly need to re-do the waste pipe from a bathroom (bath and
basin - not toilet) and some of the joints are going to end up in a
space which will become inaccessible thereafter. I therefore need to use
solvent weld joints in this location because I can't risk push-fit
joints leaking or coming apart.

Having not used solvent weld very much

Do make sure you get a solvent weld pipe, your bog-standard pipe from the
sheds doesn't take solvent weld at all.

?

I've bought solvent weld ABS from B&Q - in fact they have a surprising
range of fittings in T Wells.

It's also worth noting that you can
get a gap-filling solvent paste as well as ordinary solvent weld.


I wonder if that is what mine is - it is a very heavily loaded cement,
quite gooey and blobs of it set solid.

--
Tim Watts

Hung parliament? Rather have a hanged parliament.