Thanks Craig.  Yes, the valve room is below grade.

If we use nitrogen to charge the dry system then would we just use standard DI?


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

-----Original Message-----
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On 
Behalf Of Prahl, Craig/GVL
Sent: Monday, February 19, 2018 11:36 AM
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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