Dear Forumites, We have been installing dry pipe systems in an industrial facility in a "campus" of unheated warehouses. City water pressures range from 120 to 125 static, with 1,500 GPM flows with very high residuals. We have been experiencing high pressure surges (sometimes as much as 100 PSI over static) from the city, resulting in tripping of some of these systems. We have adjusted air pressures to 50PSI throughout the campus. We have been using Tyco DPV-1 valves that have a 5.5 differential, and some RASCO FX valves that have a differential of 6. The water company Is not much help, offering no solutions or even admitting to a surge pressure problem. Has anyone had this problem before and can offer any solution?
John R. O'Connor, SET, RME National Fire Sprinklers, Inc. 2601 Elm Hill Pike, Suite J Nashville TN 37214 Office 615-885-1301 Fax 615-885-7505 Cell 615-519-1118 jocon...@nfspk.com <mailto:jocon...@nfspk.com> In God We Trust
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