Supposedly a hacksaw. My opinion is that you're more likely to get success
(and much more quickly) by reusing the old olive than hacking the pipe
around. You can get proper olive removers, but they're expensive.
I think I may have misread the original question. Obviously, you reuse the
olive if just retightening an old joint. I was thinking that the entire
valve had been replaced. (i.e. replacing handwheel with TRV).
Dremel type device, slim cutting disk and cut a partial thickness groove in
it (I usually do it on the diagonal). When deep enough (but obviously not
full thickness if you want to avoid damage to the pipe) insert the tip of a
good screwdriver in the slot and twist. This will then snap the olive.
The most important part is to make your cut as clean as possible with
vertical sides so that the screwdriver tip gets a good purchase.
I don't normally replace the olive unless I want to replace the nut as well
(with a nice shiny new one) that you can't remove because of the olive.
To remove the old olive I use a junior hacksaw blade and cut through the
olive as far as I dare, so the pipe is not damaged. Then using a suitable
flat bladed screwdriver put in the slot and twist. The olive should then
become free (as will the nut!).
So long as the fitting hasn't been over tightened I find you can usually get
the old olive off by adjusting a large adjustable spanner to snuggly fit the
pipe, and using it as a slide hammer on the nut of the fitting against the
olive. But having got it off I wouldn't re-use it unless my back was to the
wall (ie Sunday night everywhere closed and wife wants a shower!) and then I
would aneal it (heat to red hot) before use.
On the issue of removing olives ( not required when reffiting existing
compression joints..usually ) I noticed a plumber using an olive
nibbler. Looked like a pair of pliers whith biting ends. Just cut
through an olive in a second leaving the pipe intact.
> I don't, often (almost allways) they are stuck to the pipe real well.
> I just clean them up, and re-wrap with PTFE.
You probably don't even need the PTFE: I either use nothing but the
olive or, if the joint is likely to be inaccessible, a bit of boss
white. Seems to work pretty well!
I also use Andrew's slide hammer method. If the joint was made correctly in
the first place and not over tightened, then the olive comes off fairly
easily. If it does fit a new olive. If not then a few wraps of PTFE, or
If using jointing compound, for those who may not be aware, be sure it's fit
for the purpose,especially if using compression joints on potable (drinking)
water supplies. Boss White is not suitable for use on potable water.
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