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.

 

[ShaunCorbs]

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.

you don't know your born these days

Told you, you would love them

 

[cr0ft]

Is it normal for the end of the pipe by the fitting to bend onwards very slightly? Nothing leaked but I'm guessing it will do as it's basically a big pneumatic press

 

[ShaunCorbs]

Is it normal for the end of the pipe by the fitting to bend onwards very slightly? Nothing leaked but I'm guessing it will do as it's basically a big pneumatic press

Yes that's normal

Amy pics ?

 

[Chalked]

Pic of Amy. As requested

 

[cr0ft]

Will be grabbing some tomorrow when it doesn't leak

Won't look that good though!

 

[Old Account]

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!

I would just rub the blade from top to bottom of the thread and you will get a pretty nice rough thread which is great for loctite or any other product like horeses hair I guess that's what you guys call it here.

 

[gmartine]

My tube of 557 seems to take overnight to cure properly.

 

[ShaunCorbs]

Well you leaking yet ?

 

[cr0ft]

We're there tried the Loctite 55 again today. Must have just been a tight thread on the first one. Worked a treat on the second one today

Broken my commercial plumbing virginity

Non-insulated pipe at the back is mine!

 

[ShaunCorbs]

Looks good any reason why you didn't use a f + f lever valve first ??

 

[cr0ft]

Do you mean on the left hand side of the pics?

 

[ShaunCorbs]

Yes, there's one just out of shot on the rider (right hand side) that's all.

In the first pic left I mean

 

[cr0ft]

Oh ok. Would it have saved any joints?

One thing I noticed today is 54mm conpression fittings seem a bit prone to weeping when tightened up!

 

[ShaunCorbs]

Would of looked better

Cpvc male iron straight into the lever valve

Then an 11/2 to 54mm male iron the other end to convert back to copper

Hope you left the glue 24 hours to dry before water on

 

[cr0ft]

Fair one re aesthetics!

All but the unions were prefabricated off site so glue had a week to dry.

Both union connections got 22 hours before pressure put through it. To be fair nothing coming out at all and we were there tidying up for 45 mins afterwards.

Couldn't do 24hrs for operational reasons but to be fair glue was solid by 22, nice warm plant room to accelerate chemical reaction.