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  #1  
Old 10-02-2007, 02:50 PM
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PurpHaze PurpHaze is offline
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Anatomy of a main line leak?

The guys repaired a 4" main line leak under a concrete sidewalk while I was gone and Leo saved the "leak" for me which occurred at a SCH 40 glued bell joint. Since I had the time I cut the bell open to investigate the leak and here's some pictures of what I found.

I've glued a new 4" fitting together (didn't have an extra bell and bevelled end so just glued together a coupling) and will tear it apart sometime next week to compare to this one. I'm not sure if it was glue failure or what. Any ideas?
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Old 10-02-2007, 03:34 PM
Kiril Kiril is offline
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I would guess slightly deformed pipe. The gray cement might have prevented that leak since it has better gap filling properties than the blue.
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Old 10-02-2007, 03:37 PM
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Mike Leary Mike Leary is offline
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Maybe LACK of glue? Did you find any? I see just primer & not too much
of that either. You feeling better?
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Old 10-02-2007, 03:42 PM
Kiril Kiril is offline
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Originally Posted by Mike Leary View Post
Maybe LACK of glue? Did you find any? I see just primer & not too much of that either.
Good point. Don't see much glue in that area and a big spot lacking primer.
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Old 10-02-2007, 03:43 PM
jerryrwm jerryrwm is offline
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Yeah...looks like what little cement used was pushed ahead by the pipe. Easy pop out of the pipe also indicated lack of cement.
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  #6  
Old 10-02-2007, 03:48 PM
WalkGood WalkGood is offline
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Quote:
Originally Posted by PurpHaze View Post
The guys repaired a 4" main line leak under a concrete sidewalk while I was gone and Leo saved the "leak" for me which occurred at a SCH 40 glued bell joint. Since I had the time I cut the bell open to investigate the leak and here's some pictures of what I found.

I've glued a new 4" fitting together (didn't have an extra bell and bevelled end so just glued together a coupling) and will tear it apart sometime next week to compare to this one. I'm not sure if it was glue failure or what. Any ideas?
Maybe cleaning and prep was not done well enough. The pic of the glued surface appears that either the glue did not adhere (poor prep), glue not spread properly, or joint not twisted when freshly connected with the glue.

I've heard a plumber state that after thorough cleaning/priming n prep, glue smeared in well and evenly coat all mating surfaces , he hasn't had a leak if some glue squishes out when connected (but not puddling out all over). Also use a 1/4 turn motion when assembling.

If the glue was jelly-like consistency it may not adhere well, and should be tossed out.
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Old 10-02-2007, 03:49 PM
Kiril Kiril is offline
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Originally Posted by jerryrwm View Post
Yeah...looks like what little cement used was pushed ahead by the pipe. Easy pop out of the pipe also indicated lack of cement.

Would be nice to know how they applied the glue. To the pipe, fitting, or both. Perhaps if we could see a section of the pipe you cut out?
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Old 10-02-2007, 03:58 PM
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Mike Leary Mike Leary is offline
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I'm thinking poor primer application (should have been multiple coats)
and being glued-up at30
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  #9  
Old 10-02-2007, 04:01 PM
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CAPT Stream Rotar CAPT Stream Rotar is offline
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dam 4 inch pvc is huge....
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  #10  
Old 10-02-2007, 05:55 PM
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Mike Leary Mike Leary is offline
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dam 4 inch pvc is huge....
Out of the mouths of babes.
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