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Insulated sewer pipe

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Posted by Randy on August 11, 2006, 8:38 pm
 
I am runing two 1" pex lines underground to my home. The length is
about 125'.
The 4" insulated sewer pipe is very expensive.
What would happen if I insulate the pex with the 4' pipe insulation you
buy from Menards and run it in regular 4" PVC pipe? Do I need to run it
in the PVC pipe, Or could I just use the 4' pipe insulation? Do I need
the vapor barrier, which the insulated sewer has?
Any Ideas.


Posted by digitalmaster on August 12, 2006, 12:35 am
 


why do you need to insulate a sewer pipe underground?



Posted by daestrom on August 12, 2006, 3:08 pm
 

I *think* he's running two 1" pex lines inside a 4" PVC pipe.  Perhaps the
1" lines are to/from a collector?

So he's insulating the 4" pipe instead of the individual 1" pipes.

Or, I could have it all wrong :-(

daestrom


Posted by Ecnerwal on August 13, 2006, 1:47 am
 
Well, we'll hope that however he does it, he does not repeat the
mistakes some have made by insulating around supply and return, but not
insulating supply from return, thus creating a heat exchanger and making
it difficult to actually move heat from the source to the use point.

And as for "why you'd need to insulate sewer pipe underground" (and thus
the existence of insulated sewer pipe, whatever the use), consider a
location with the frost line at 4 feet and bedrock at 2 feet. Or the
common problem of crossing under a driveway, where the ground freezes
deeper than in other parts of the yard due to the snow being cleared off
the surface.

--
Cats, coffee, chocolate...vices to live by

Posted by Morris Dovey on August 13, 2006, 2:08 am
 Ecnerwal (in LawrenceSMITH-57EB88.21465412082006@news.verizon.net)
said:

| Well, we'll hope that however he does it, he does not repeat the
| mistakes some have made by insulating around supply and return, but
| not insulating supply from return, thus creating a heat exchanger

Good point.

| And as for "why you'd need to insulate sewer pipe underground" (and
| thus the existence of insulated sewer pipe, whatever the use),
| consider a location with the frost line at 4 feet and bedrock at 2
| feet. Or the common problem of crossing under a driveway, where the
| ground freezes deeper than in other parts of the yard due to the
| snow being cleared off the surface.

From his earlier post at
1154496209.250025.76950@b28g2000cwb.googlegroups.com, I think he's
doing a short (~10') run from his solar-heated shop to the house.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto



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