Gluing threaded joints

[rptsj583]

I am currently installing my own in ground pool and having a difficult time getting the threaded joint on each return to seal. So, I’m asking if anyone has used pvc cement to glue the threaded joint? This joint will be buried once sealed and hopefully never to be seen again. I used Spears number 75 blue thread sealant, but even the slightest vibration or movement of the pipe creates a pressure leak, which kinda scares me once i start backfilling. Even using the sealant, i still need to cut out the pipe again to seal, since once the pipe is glued to the back of the fitting, there is no way to unscrew it. Since this will never need unscrewed, then why not just glue the threaded fitting? It should seal solid, right?
Thanks for any advice,

 

[Rancho Cost-a-Lotta]

Welcome to TFP!

I've done my share of PVC work, but I've never tried gluing a threaded joint. I guess the first question is why not use a regular SCH 40 coupling? If you do try to use PVC cement, you'll need one with an extended working time. Most that I've used give you a few seconds before they start to fuse together.

While you're wading around for more responses, spend some time in Pool School:

PVC Repair - Further Reading

www.troublefreepool.com

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Your one-stop shop for all things TFP to include: ABCs of Water Chemistry, Recommended Chemicals/Levels, Test Kits, Troubleshooting, and much more!

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Best wishes!

 

[rptsj583]

I am currently installing my own in ground pool and having a difficult time getting the threaded joint on each return to seal. So, I’m asking if anyone has used pvc cement to glue the threaded joint? This joint will be buried once sealed and hopefully never to be seen again. I used Spears number 75 blue thread sealant, but even the slightest vibration or movement of the pipe creates a pressure leak, which kinda scares me once i start backfilling. Even using the sealant, i still need to cut out the pipe again to seal, since once the pipe is glued to the back of the fitting, there is no way to unscrew it. Since this will never need unscrewed, then why not just glue the threaded fitting? It should seal solid, right?
Thanks for any advice,

The returns are Hayward SP1408. The back of each return is threaded. They also feel loose like they are not tapered threads. Also, when I tighten each down, they end up bottoming out even just using hand tight.

 

[Rancho Cost-a-Lotta]

The returns are Hayward SP1408. The back of each return is threaded. They also feel loose like they are not tapered threads. Also, when I tighten each down, they end up bottoming out even just using hand tight.

I see. I was picturing underground PVC pipe.

I found this document that makes reference to the use of a combo locknut-spacer if pool wall is 1/4” or less in thickness.

https://www.hayward-pool.com/assets/documents/pools/pdf/manuals/IS1408.pdf

Hopefully you'll get some help here.

 

[AQUA~HOLICS]

Have you tried this?

 

[Bill1974]

I had the same return fitting replaced on my pool last year. There was no threading issue on mine. I would try a different male threaded adapter and see if that makes a difference. If not try replacing the Hayward fitting.

If I have loose fitting pipe threads I generally put a number of wraps of teflon tape and pipe dope to make it a tight fit.

Gluing a threaded joint is going to be difficult. You will get 3 or 4 threads in before it locks up and you can't get it as tight as you like. And you don't get another try. I tried it as a last ditch effort to salvage the fittings that were already in my pool. I did not want to mess with the liner that was put in earlier in the year.

If you are set on gluing, I would bore out the threaded so it has the same bore as a socket fitting. Using something like this PPR150 | Clean Ream Extreme® Plastic Pipe Fitting Reamers | Reed Manufacturing