Tiny leak on compression fitting, simple plumbing problem.

Feedback for those that offered advice.
The stub pipe was so short that the nut could not be pushed back clear of the olive, so tape would not work, I tried the Fernox sealant, after draining below the pipe level, first I put it around the olive though it was difficult to get it behind the olive evenly, I put some on the threads too, then I tightened it, left it for 48 hours then applied around both ends of the nut; after another 48 hrs I turned on the pump to pressurise the system, started to drip at the same rate as before. Came straight home and called Surecal, proper British made copper cylinder is on its way. I am not sure if any of the Isotherm bits are any use to anyone before I hurl it in the skip at the Basin?
 
probably a bit late as you bought a new cylinder but just incase you should have cut nut and olive with either dremmel if no access and if access a simple hacksaw will do and cut through nut and split to remove and then cut through olive carefully as not to cut pipe and I would then suggest replacing with a compression fitting using paste on threads only and thin bit on top of olive then tighten up and job done
awkward I know but not hard just take time and don't stress
done load`s like this in domestic and on boat `s in harder places to get at probably
but never use ptfe on these type of joint`s always use paste and not to much and not to tight either it is easier to tighten to seal than to overtighten and never seal

hope this help`s
nick:encouragement:
 
I'd have used this

DSCF1439.jpg
 
Agreed Vic, if you must, but where do you put it? Slathering it all over the place is a waste of time. The only place for jointing compound is between the face of the olive and the sealing face of the fitting.

Yes I think thats what I said in #5.

I might also mix it with some of this. ( not intended to be be mixed but very effective in bunging up leaks when they were IIRC)

DSCF1440.jpg
 
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