Loctite 55

[cr0ft]

Is this stuff rubbish or am I just unlucky? Applied it to a 2" BSP joint as per the instructions. Each time it kept pulling out or jamming up the thread.

Tired 4 times in total before opting for PTFE instead. Job done..

 

[Scott_D]

Did you rough up the thread?
How many turns?

 

[ShaunCorbs]

Did you do it the right way / overlap the last strand

I would say unlucky

 

[townfanjon]

I use it on everything and its great gear, however I have never used it on anything as big as 2”

 

[cr0ft]

I think I might have been a doughnut and roughed up the grooves of the thread. I get the impression you're supposed to run the saw across the threads rather than along the grooves??

Anything better than a saw blade to rough them up? That will take forever on a 2" thread!

 

[Chalked]

55 is good if it's a slack thread. For everything else I use 577 LOCTITE 577 Pipe Sealant - Loctite
In two years, ive had one 1" threaded fitting drip.

Every single threaded joint on this job, was done with 577 . Including the 2"

 

[Scott_D]

Ha, yes roughen the threads so the cord doesnt slip off.
2x hacksaw blades with a gaffa tape handle and scrape as your turn the pipe/fitting. 30 seconds job done

 

[Chalked]

Don't use too much 55. It's tougher than ptfe and will just end up out of the joint. I split a 1/2" backplate elbow tightening a cranked bar shower fitting !

 

[cr0ft]

Will try that tomorrow scott_d. Just seems like there's no room in the thread for the sealant though. Had 4 turns going in, packet says 15 needed. Couldn't tighten it with 2x 2' stilsons!

Which merchants stock loctite 577 chalked please? With a 3 hour cure time I'd like to try it tomorrow for attempt 2!

 

[ShaunCorbs]

Will try that tomorrow scott_d. Just seems like there's no room in the thread for the sealant though. Had 4 turns going in, packet says 15 needed. Couldn't tighten it with 2x 2' stilsons!

Which merchants stock loctite 577 chalked please? With a 3 hour cure time I'd like to try it tomorrow for attempt 2!

What's it for ?

 

[cr0ft]

2" softened water feed to some massive loft tanks.

 

[ShaunCorbs]

2" softened water feed to some massive loft tanks.

Instant then upto 6 bar

 

[Scott_D]

Is the fitting a tight fit with nothing on?
4 turns per thread or over the entire fitting?

 

[Chalked]

I get the large toothpaste sized tubes from a merchant in leeds £42. Seems a lot, but that whole job used 1/4 of it.

It will hold pressure straight away.but full strength talkers a few hours.

 

[ShaunCorbs]

Bss normally

 

[cr0ft]

Just read, 3 hours full cure time. That's doable to be honest, but none of the merchants in Lincoln will stock it I bet!

We have a BSS, worth trying them tomorrow.

The thread is definitely quite tight, I can't even get 4 turns of 55 over the whole thread without it binding and becoming impossible to tighten.

 

[Chalked]

BSS keep it.
LINCOLN | BSS

Plumb Center do too. In the 50ml size

 

[Chalked]

Cheap here
Loctite 577 Pipe Sealant 250ml-Expiry 2019 | eBay

 

[cr0ft]

Thanks all. Need it tomorrow first thing and BSS is round the corner.

That seems like what I need for this job tbh. Give it 3 hours and no leaks. The pipework is feeding the cold water tanks at a small hospital and I've had to leave them isolated but full overnight and tell wards to lock bathrooms till tomorrow. All because Loctite 55 wouldn't work 🙁

 

[cr0ft]

Tell you what it's like learning all over again, even though they are still compression fittings.

One positive from today - Yorkshire Xpress fittings are brilliant aren't they, made in seconds! I'm a convert.