I have a job site which is 10ft higher than the water supply. A gauge on the water supply hydrant reads 55 PSI static pressure while two gauges on the system riser after the BFP read 37 PSI? The total elevation change between the system gauges and the supply gauge is about 17ft. Why would there be a 18 PSI difference between the gauges when elevation only accounts for 7.36 PSI? I confirmed with the city that there are no shut valves. Any thoughts? Thanks, Dewayne _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
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