Welcome to Plbg.com
Thank you to all the plumbing professionals who offer their advice and expertise

Over 698,000 strictly plumbing related posts

Plumbing education, information, advice, help and suggestions are provided by some of the most experienced plumbers who wish to "give back" to society. Since 1996 we have been the best online (strictly) PLUMBING advice site. If you have questions about plumbing, toilets, sinks, faucets, drains, sewers, water filters, venting, water heating, showers, pumps, and other strictly PLUMBING related issues then you've come to the right place. Please refrain from asking or discussing legal questions, or pricing, or where to purchase products, or any business issues, or for contractor referrals, or any other questions or issues not specifically related to plumbing. Keep all posts positive and absolutely no advertising. Our site is completely free, without ads or pop-ups and we don't tract you. We absolutely do not sell your personal information. We are made possible by:  

Post New
Log In
How to Show Images
Newest Subjects
 HELP!! - cpvc compression fitting fails!
Author: Anonymous User

I adapted 3/4" cpvc to 1/2" galvanized using a cpvc compression fitting only to be called back 4 hours later to a flooding house. There were no obvious reasons for it to have come apart, no broken parts, but the fitting had come off of the galvanized pipe and flooded the house.

It was a vertical application unlike others I have done in a horizontal application without any problems. Don't know if the vertical positioning makes a difference?! I can't figure out why it failed. Any ideas? I am open to any and all input.

Post Reply

 Re: HELP!! - cpvc compression fitting fails!
Author: Anonymous User

Unless you have something that I haven't run into yet the cpvc compression union will not grip on galvanized or copper.
When I adapt over ( I use cpvc all the time as primary piping ) I use steel dressure with a friction ring on galv Or brass adaptor on copper.
Good luck
Southern Plumber
Also whenever I try something new I build a test in my shop and give it heck beforew I put it in a cust. house
southern plumber

Post Edited

Post Reply

 Re: HELP!! - cpvc compression fitting fails!
Author: Dunbar (KY)

Did you check the water pressure before you made this application?

High water pressure can produce this result, along with thermal expansion from water heater, fast actuating valves (dishwasher,washing machine) or simply not tightening it down.

Post Edited

- - - - - -

Everything in Plumbing can be repaired or replaced.

Post Reply

 Re: HELP!! - cpvc compression fitting fails!
Author: Scott D. Plumber (VA)

Wow, sorry to hear about that. I hope you have a good GL policy.

I do not like compression on anything other than fixture supplies and drainage stuff (just not comfortable with them)and would get back to a threaded joint and use a CPV x mip adapter instead.

Good luck.

Post Edited

- - - - - - - - - - - - -

Give your kids a great start on the future! Encourage them learn a trade. Even if they go on to do other things, it's always nice to know that they have something to fall back on. Call your local technical training center or trade school to learn more.

Post Reply

 Re: HELP!! - cpvc compression fitting fails!
Author: hj (AZ)

In th ehorizontal installations the pipe may have been locked in place so it could not move. Unless the compression "ring" can imbed itself into the pipe, as when using copper tubing, the seal depends on friction between the ring and pipe. When that is the case, the instructions always specify that the pipe be secured so it cannot move and then the compression joint just has to seal the leak, not restrain the piping also, as it was intended to do.

Post Reply

Please note:
  • Inappropriate messages or blatant advertising will be deleted. We cannot be held responsible for bad or inadequate advice.
  • Plbg.com has no control over external content that may be linked to from messages posted here. Please follow external links with caution.
  • Plbg.com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a product (try Google), nor how to operate or promote a business, nor for ethics (law) and the like questions.
  • Plbg.com is also not a place to ask radiant heating (try HeatingHelp.com), electrical or even general construction type questions. We are exclusively for plumbing questions.

Search for plumbing parts on our sponsor's site:

Special thanks to our sponsor:

Copyright© 2024 Plbg.com. All Rights Reserved.