Anyone ever replace a section of clay sewer pipe? - Page 3 - PeachParts Mercedes-Benz Forum

#31 10-09-2006, 03:26 PM

Any type of material on the Fernco may shorten its life, a sewer pipe is not like your water pipe and does not need the pressure type fitting to work. If you installed the replacement pipe properly gravity will the the rest. Think about how clay pipe goes together, a light seal and some grease to help it slide in and thats all that is to it.

Kyle Blackmore · #32 10-10-2006, 01:22 AM

We test gravity sanitary at 3 lbs of pressure and ferncos will hold that pressure, I don't think they would take much more. You mentioned going from 6" to 4" , I hope the pipe is getting bigger towards the street/sewer main.If it's being reduced and it's leaking there try adapting from clay to pvc (with the fernco)and then using an eccentric 4 to 6 adaptor and then convert back to clay with another fernco. If you did everything right there should be no leaks.BTW we use gasket joint pvc pipe at work,if you use glue-joint make sure you have the right glue and primer.
But like Medmech said it should be no big deal, if it's leaking at the fernco then the sealing surface (probably on the clay) isn't clean or the clamp isn't tightening against the rubber/clay.If the clay pipe has a rough end it can be squared up with a crescent wrench sized to the pipe thickness and used to slowly 'nibble' away at the clay. Good luck

t walgamuth · #33 10-10-2006, 06:18 AM

i understand what you recommended i think.

you didnt say why siliicone should not be used underground. or med tech may have been responding to that question with his comment about other materials deteriorating the fernco.

a fernco is one of those devices which is basically a rubber boot with two clamps, right? yea, i understand. they should not need anything else if the pipe being connected is solid and round.

so his leak must have been from a malformed piece of pipe ?

tom w

MS Fowler · #34 10-10-2006, 07:14 AM

Quote:

Originally Posted by Kyle Blackmore

We test gravity sanitary at 3 lbs of pressure and ferncos will hold that pressure, I don't think they would take much more.

Kyle,
A few years ago, I was testing some sanitary on private property. I was to test the backfill, and, "oh yeah, while you're hear can you run the air test".
The Owner was on site, and had no idea of what we were doing but he wanted the air test at 50 psi. The contractor and I were able to talk him out of that--but, in my mind's eye, I can see the cleanouts being launched into low earth orbit if we had hit them with 50 psi.http://www.peachparts.com/shopforum/images/smilies/smile.gif

A264172 · #35 10-10-2006, 04:30 PM

Maybe I should not be trying to connect the fernco (yes Tom, rubber sleeve with two clamps) to the flange end of the clay pipe... (which is rounded and slooping down toward the pipe and has ribs around the perimiter making a poor mating surface) ...but rather cut the clay pipe where it is smooth and straight and connect onto that. The pipe does go from 4" to 6" on the way to the main btw.

Kyle Blackmore · #36 10-10-2006, 08:43 PM

Quote:

Originally Posted by MS Fowler

Kyle,
A few years ago, I was testing some sanitary on private property. I was to test the backfill, and, "oh yeah, while you're hear can you run the air test".
The Owner was on site, and had no idea of what we were doing but he wanted the air test at 50 psi. The contractor and I were able to talk him out of that--but, in my mind's eye, I can see the cleanouts being launched into low earth orbit if we had hit them with 50 psi.http://www.peachparts.com/shopforum/images/smilies/smile.gif

I had the same feeling when a city inspector wanted us to test the watermain at double its working pressure.City waterworks said it may spike up to over 200 psi ,but was usually in the 160-170 psi range (we were upstream of the PRV station). That meant testing at 400 psi

, thankfully I negotiated down to 285 psi.
Tom, I was just trying to point out that it's not the stuff to use in that situation. You wouldn't put silicone on your radiator hose to seal it would you

The pipe has to fit all the way into the fernco to get a proper seal, crank the clamp as tight as you can with a screw/nutdriver and it should be good to go

t walgamuth · #37 10-10-2006, 11:32 PM

Quote:

Originally Posted by A264172

Maybe I should not be trying to connect the fernco (yes Tom, rubber sleeve with two clamps) to the flange end of the clay pipe... (which is rounded and slooping down toward the pipe and has ribs around the perimiter making a poor mating surface) ...but rather cut the clay pipe where it is smooth and straight and connect onto that. The pipe does go from 4" to 6" on the way to the main btw.

bingo. you need to break off the flange to get a proper fit on the fernco.

tom w

t walgamuth · #38 10-10-2006, 11:33 PM

Quote:

Originally Posted by Kyle Blackmore

I had the same feeling when a city inspector wanted us to test the watermain at double its working pressure.City waterworks said it may spike up to over 200 psi ,but was usually in the 160-170 psi range (we were upstream of the PRV station). That meant testing at 400 psi

, thankfully I negotiated down to 285 psi.
Tom, I was just trying to point out that it's not the stuff to use in that situation. You wouldn't put silicone on your radiator hose to seal it would you

The pipe has to fit all the way into the fernco to get a proper seal, crank the clamp as tight as you can with a screw/nutdriver and it should be good to go

no not a radiator hose. and now that i understand all the facts i see your point.

thanks for the clarification.

and silicone wont deteriorate underground, particularly, it just isnt supposed to be needed.

tom w

A264172 · #39 10-11-2006, 07:58 AM

Quote:

Originally Posted by t walgamuth

bingo. you need to break off the flange to get a proper fit on the fernco.

tom w

I made two phone calls yesterday to get the phone number of the only plumber I know (fishing buddy in a group of 15) and he agrees with this idea as well. So it looks like it's a go. Probably excavate around the next good looking piece of 6" and use a diomond blade grinder to clean it up.

Thanks all.

t walgamuth · #40 10-11-2006, 11:24 AM

note above the method of breaking the clay with a cresent wrench. nibbling away at it....

tom w