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Posted by willshak on October 15, 2007, 11:43 am
on 10/15/2007 11:26 AM John said the following:
>
>
>>
>>
>>> What is the best way, what material to use to thermally insulate 12
>>> meters of sewer pipe ceramic or plastic with 60 cm diameter, from the
>>> surrounding hearth, 2 meters from the surface. Expected temperature 8
>>> to 16 degrees C
>>> Assuming the pipe will be half full of water, that represents a
>>> considerable weight. Any foam product will be compressed to the point
>>> of seriously reduce it's thermal properties.
>>>
>>> Thanks for the help
>>>
>>> John
>>>
>> Why do you want to insulate it? It can't freeze, hell it's two meters
>> (your estimate) from the surface. Here in Northern New England (USA)
>> where we see 20 below frequently each year, the frost line is about 4
>> to 5 ft (or a meter and a half).
>>
>
> Peter
> You are correct on everything you say. Actually I am not very far from
> you.
> The air temperature may be -20C but the temperature of the ground at 2
> meters below the surface is about +8
Where do you live, where there's permafrost? The temperature at 2 meters
deep is about 55º F year round, at least here in NY. The reason that
footings are set at 4" is because that is below the frost line. If it
was +8 at two meters, then the footing would have to extend below 2
meters until it reached a temp above 32º.
Besides the fact that septic tanks and dry wells would freeze solid.
> and the temperature of the
> sewer's gray water is about +14 and this pipe is going to be used as a
> storage tank of the sewer heat.
> When building houses on a flat cement slab, don't they thermally
> insulate the slab from the ground?
>
> John
>
--
Bill
In Hamptonburgh, NY
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