Pipe Engineering Help (OT)

[Anonymous]

I have an 8" PVC sewer that crosses perpendicularly OVER an 18" RCP storm drain. The vertical clearance is less than 1'. I think I should encase the storm drain in concrete because it is the lower pipe, but the plan check thinks it should be the sewer. What do you guys think?

[Anonymous]

Common practice in these parts would be to encase the san. sewer if there
was not 1.5' of vertical clearance OR 10' of horizontal clearance. The idea
is to prevent the san. sewer from leaking not to prevent the storm sewer
from taking-on sewage.

John

[Anonymous]

Along with John's input, wouldn't you want to encase the pipe that would
carry flow that would be more "hazardous" once spilled?

--
Don Reichle
"The only thing worse
than training your staff,
and having them leave is -
not training your staff,
and having them stay."
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"John Mayo" wrote in message
news:5105016@discussion.autodesk.com...
Common practice in these parts would be to encase the san. sewer if there
was not 1.5' of vertical clearance OR 10' of horizontal clearance. The idea
is to prevent the san. sewer from leaking not to prevent the storm sewer
from taking-on sewage.

John

[Anonymous]

And along with all that input;

you'll need less concrete to encase an 8" pipe vs an 18" pipe.

the encasement would be cheaper *and* stronger.

[Anonymous]

Now we're getting down to "brass tacks".

Pipe diameter differential - indeed!

--
Don Reichle
"The only thing worse
than training your staff,
and having them leave is -
not training your staff,
and having them stay."
Courtesy Graphics Solution Providers
----------------------------------------------------------
C3D/LDT/CD/SVY-2K6
Intel P4-3.00GHz
XPPro 32bit SP2
1GB RAM
Nvidia GeForce2 Ti 64MB


"doug k" wrote in message
news:5105279@discussion.autodesk.com...
And along with all that input;

you'll need less concrete to encase an 8" pipe vs an 18" pipe.

the encasement would be cheaper *and* stronger.

[JohnBandas7271]

What does OT stand for?

What do your state/municipal rules say?

And the heat of hydration of encasing SDR 35 PVC can cause an out of round condition that will prevent a successful mandrel pull for testing.

Try pea gravel all the way from below 18" to above 8" unless your state/municipal rules state differently.

[Anonymous]

OT = Off topic

local standard around here is to use cement lined duct iron pipe for the
length of the sanitary encasement (usually about 20')

4,000 psi concrete is the ONLY encasement material allowed around here (PA).
Don might begin to understand now how it is more desirable to encase the
smaller pipe under these conditions. 😉

The OP (original poster) definitely has to check local codes for the correct
answer.

--
Doug K

wrote in message news:5105508@discussion.autodesk.com...
What does OT stand for?

What do your state/municipal rules say?

And the heat of hydration of encasing SDR 35 PVC can cause an out of round
condition that will prevent a successful mandrel pull for testing.

Try pea gravel all the way from below 18" to above 8" unless your
state/municipal rules state differently.

[Anonymous]

snip>Don might begin to understand now how it is more desirable to encase
the smaller pipe under these conditions.
Huh? Come back one more time wid dat an' ah mite unnerstan ya!

:-)

--
Don Reichle
"The only thing worse
than training your staff,
and having them leave is -
not training your staff,
and having them stay."
Courtesy Graphics Solution Providers
----------------------------------------------------------
C3D/LDT/CD/SVY-2K6
Intel P4-3.00GHz
XPPro 32bit SP2
1GB RAM
Nvidia GeForce2 Ti 64MB


"doug k" wrote in message
news:5105535@discussion.autodesk.com...
OT = Off topic

local standard around here is to use cement lined duct iron pipe for the
length of the sanitary encasement (usually about 20')

4,000 psi concrete is the ONLY encasement material allowed around here (PA).
Don might begin to understand now how it is more desirable to encase the
smaller pipe under these conditions. 😉

The OP (original poster) definitely has to check local codes for the correct
answer.

--
Doug K

wrote in message news:5105508@discussion.autodesk.com...
What does OT stand for?

What do your state/municipal rules say?

And the heat of hydration of encasing SDR 35 PVC can cause an out of round
condition that will prevent a successful mandrel pull for testing.

Try pea gravel all the way from below 18" to above 8" unless your
state/municipal rules state differently.

[Anonymous]

I mentioned earlier that encasing the smaller pipe is more economical.

I believe you might have accused me of nit-picking just a little (and I
probably was).

"Don Reichle" wrote in message
news:5105566@discussion.autodesk.com...
snip>Don might begin to understand now how it is more desirable to encase
the smaller pipe under these conditions.
Huh? Come back one more time wid dat an' ah mite unnerstan ya!

:-)

[Anonymous]

Nope, I was agreeing with you.

I had caught your "drift" re. 8 inch being smaller than 18 inch.

Sorry for not being clear enough. 😞

--
Don Reichle
"The only thing worse
than training your staff,
and having them leave is -
not training your staff,
and having them stay."
Courtesy Graphics Solution Providers
----------------------------------------------------------
C3D/LDT/CD/SVY-2K6
Intel P4-3.00GHz
XPPro 32bit SP2
1GB RAM
Nvidia GeForce2 Ti 64MB


"doug k" wrote in message
news:5105573@discussion.autodesk.com...
I mentioned earlier that encasing the smaller pipe is more economical.

I believe you might have accused me of nit-picking just a little (and I
probably was).

"Don Reichle" wrote in message
news:5105566@discussion.autodesk.com...
snip>Don might begin to understand now how it is more desirable to encase
the smaller pipe under these conditions.
Huh? Come back one more time wid dat an' ah mite unnerstan ya!

:-)