When taking the static/residual reading from a sprinkler riser, I think the effective point (the point the calcs should be taken back to) is the point where the non-flowing water meets the flowing water. If the public water main is looped, this would be where the sprinkler line ties into the public water main. If the public water main is dead-end and the flowing hydrant is upstream of the sprinkler line connection, the effective point would be where the hydrant connects. If the flowing hydrant is connected to the sprinkler line, the effective point would also be where the hydrant connects.
Disregarding elevation differences, the pressure (static or residual) throughout the non-flowing part of the piping will be the same as that at the system riser. Yea, I stayed at a Holiday Inn Express last night. Anybody else? Ed Kramer Littleton, CO > >Per edition 5 of the American Mutual Insurance Alliance Simplified > water > >supply testing "In testing a water system at a sprinklered plant, > sometimes > >we can note the residual pressure from a gauge at the base of the > nearest > >riser. This is not recommended as standard practice, but may be used > when > >other methods are not practical." > > This was taught at FM when I was there. The logic is that the > effective point of the test would be as close to the sprinkler system > riser as possible, which has merit to it. _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
