Sealing An expansion Vessel Leak

[iansmith7]

Hi Everyone
I recently bought from Toolstation an expansion vessel and fitting kit. I have fitted it along with a new PRV to my C.H. sysytem and it has cured the presure problems I was having. However thre is a leak from the top of the expansion vessel through the threads of the union. I have tried to seal it twice with thread tape without success.
Any suggestions as to how I could cure this (gas spec tape?).
Thanks for your Help.
Ian

 

[bengasman]

Are you sure the male thread is tapered bsp?

 

[iansmith7]

Hi
thanks for your reply & sorry for the delay in answering.
I am not certain but from memory I would say the male thread on the vessel is parrallel not tapered.
Ian

 

[ChrisR]

Either
1) use a washer. Rubber, 3/3" should do
or
2) put the right amount of tape on in a manner what it doesn't slip off
or
3) Use Loctite 55 "string"
or
4) put LS-X or similar sealant all over the ptfe tape
or
etc!

 

[bengasman]

In my experience the only way to seal parallel thread reliably is with a washer.

 

[africanplumber]

use the horses hair boss white

 

[muggles]

L55 every time

 

[gavinda]

make sure you are using 'multiwrap' ptfe as its much easier to get a good seal with.

had no problem today changing a heat exchanger with parallel threads and ptfe only.

 

[libby lou lou]

Some people on here, believe other people on here are to==sers for using ptfe, can't be convinced yet not to use it.

 

[petit_pablo]

Some people on here, believe other people on here are to==sers for using ptfe, can't be convinced yet not to use it.

PTFE used in the correct way is fine. Using it to supplement olives on a compression joint is seen as cowboy by many.

 

[gavinda]

not just seen to be. is.


must go now . done my 45, now 8 'standby' busy day tommorow, thankyou children in need.

 

[petit_pablo]

not just seen to be. is.


must go now . done my 45, now 8 'standby' busy day tommorow, thankyou children in need.

Im living the joy of GA tonight.

 

[gavinda]

kerrrrrching. 4 callouts last saturday including one telephone consultation

 

[libby lou lou]

Hi Everyone
I recently bought from Toolstation an expansion vessel and fitting kit. I have fitted it along with a new PRV to my C.H. sysytem and it has cured the presure problems I was having. However thre is a leak from the top of the expansion vessel through the threads of the union. I have tried to seal it twice with thread tape without success.
Any suggestions as to how I could cure this (gas spec tape?).
Thanks for your Help.
Ian[/quot

Your not doing it right.

 

[Agile]

Getting back to the OP's question, I always find that a fibre washer is the only correct and always effective solution to sealing these connections.

I hope the OP set the air pressure correctly.

Tony