Was drilling fully explored? Horizontal directional drilling can get you sufficiently deep to miss all obstructions, even if you're entry/exit pits are shallow. And, High Density Polyethylene can be used so that there is a single run of pipe with no joints.
Just thinking. J. Scott Mitchell, PE -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Frans Stoop Sent: Thursday, February 18, 2016 5:46 PM To: [email protected] Subject: Routing a fire water mains over the roof Dear colleagues, A client has an existing alarm valve room in an open air courtyard of his complex building, fully enclosed by parts of the building. It may freeze in this coutry, sometimes upto -20 deg C (-4 deg F). We are looking for a way to connect the valve room to the underground fire water mains outside the perimeter of the building by way of a new DN300 (12 inch) header. Passing through the building or its souterrain is very difficult or might even be impossible. (All rooms, including the souterrain are in full use and have access limitations.) Drilling a tunnel underneath the souterrain has been rejected because of possible damage to the foundation and all the existing pipes and cables that might lay under the building. Client has come up with a proposal to route this 12 inch header over the roof, meaning 14 m up along the outside wall, 17 m horizontal over the roof and 14 m down again into the courtyard. That above ground loop would be made in hot-dipped galvanized steel, insulated and heat-traced. What is your opinion about that solution? And why? Has this been done often? Looking forward to your appreciated views. Met vriendelijke groet/Kind regards, Frans Stoop Riskonet B.V. Singel 540, 1017AZ, Amsterdam T +31 6542 37 642 www.riskonet.com [email protected] _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
