I would not extend a dry system underground - there's worms and stuff down there.

B.
Quoting Richard Matsuda <rick26...@att.net>:

Since the pipe is running underground, is PVC or CPVC acceptable? Those are already used for underground piping for free-standing FDC's.Just trying to think outside the box.rick

On Monday, February 19, 2018 8:06 PM, Bruce Verhei <bver...@comcast.net> wrote:



https://www.dipra.org/contact-dipra/ask-an-engineer


On Feb 19, 2018, at 17:49, Charles Thurston <thurst...@pyebarkerfire.com> wrote:

My concern with the cement lined Di. Is it not designed to have water in it all the time keeping the cement lining wet? I would be concerned on a fry system of the cement drying out. I know I have walked on plenty of dry dement walks and gotten that white powder off it and the surface has dried out and turned back to powder.



Best regards,
Charles Thurston                          thurst...@pyebarkerfire.com
MYRTLE BEACH FIRE SAFETY GROUP
A Division of Pye-Barker Fire Safety
1445 Cannon Road
Myrtle Beach, SC 29577
(843) 916 - 8787
(843) 839 - 3473 facsimile



-----Original Message-----
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On
Behalf Of Prahl, Craig/GVL
Sent: Monday, February 19, 2018 12:36 PM
To: sprinklerforum@lists.firesprinkler.org
Subject: RE: Underground Dry System Pipe Type

Cement lined ductile iron.  If you use standard DI, and a standard atmospheric sourced air compressor you can have rust and scaling buildup with ambient air
inside pipe in contact with cooler ground temps.

How are you going to slope underground pipe back to an aboveground valve
room?  Basement level valve room?


Craig L. Prahl
Fire Protection Group Lead/SME
Direct - 864.920.7540
Fax - 864.920.7129
Direct Extension  77540
CH2M is now Jacobs.
200 Verdae Blvd.
Greenville, SC  29607
craig.pr...@ch2m.com
http://www.jacobs.com

-----Original Message-----
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On
Behalf Of Reed A. Roisum, SET
Sent: Monday, February 19, 2018 12:11 PM
To: sprinklerforum@lists.firesprinkler.org
Subject: Underground Dry System Pipe Type [EXTERNAL]

I asked a similar question a number of years ago and it appears as though the
consensus at that time was that dry-pipe system underground pipe should be
ductile iron.  We have an application where the dry-pipe system leaves the valve room and goes underground and then extends above ground.  Is ductile iron the best option for the underground portion?  We are able to slope to drain back to
the valve room.

Thank you.

Reed Roisum


Reed A. Roisum, SET | Karges-Faulconbridge, Inc. | Senior Fire Protection
Designer | Fargo, ND | direct: 701.552.9903 | mobile: 701.388.1352 |
KFIengineers.com<http://www.kfiengineers.com>

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