My male piece isn't long enough .....

[satprof]

Whilst not wishing to get a bad reputation from my first post, I really do have that problem on a heating circuit I'm installing. I've got a Female 1½" to Male parallel 1" (brass) adapter and the male end is too short for the female part of the next coupling.

Should I

a.) Use two aramid washers;
b.) Use an aramid washer on top of a rubber washer;
c.) Use a brass or stainless or other type of washer as a spacer, with jointing compound or liquid ptfe on the threads;
d.) Saw the female part shorter;
or e.) Find a different way of doing it?

The application is for an unvented underfloor heating system normally running at max. 40°C. and the joint is only likely to be undone in the event of the pump being replaced, or because it's leaking ...

Thanks for your advice.

 

[bernardgreen]

I have seen ( and admit to doing it myself ) brass fittings soldered together rather than trust a sealing compound or other means to seal the threaded joint.

 

[Steelmasons]

I have seen ( and admit to doing it myself ) brass fittings soldered together rather than trust a sealing compound or other means to seal the threaded joint.

So what jointing method would you use on a ground faced seat union????...possibly weld the union as opposed to using jointing compound????
...what are your thoughts regarding threaded steel???

 

[bernardgreen]

...what are your thoughts regarding threaded steel???

I said BRASS, and steel isn't brass, as I do not have a welding kit threaded steel would have to be sealed by used of a compound.

 

[oilboffin]

Oops not getting into this one.

 

[satprof]

After doing a bit more research, I'm now thinking of using Loctite 55. The fitting this is going to be attached to is an isolation valve, and I would much rather that it is orientated sensibly. If Loctite 55 means that the male thread doesn't have to be pressed against a washer, I kill two birds with one length of L.55. And, yes, I will try to remember to score the threads! (Is this why some fittings come with the first 3 or 4 threads 'pre-scored', or is there some other reason?)