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> ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________ -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.firesprinkler.org/private.cgi/sprinklerforum-firesprinkler.org/attachments/20180219/ab1fd556/attachment.html> _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
