The issue: IPC 2006, 606.5.5 A low-pressure cutoff shall be installed on all booster pumps in a water pressure booster system to prevent creation of a vacuum or negative pressure on the suction side of the pump when a positive pressure of 10 psi (68.94 kPa) or less occurs on the suction side of the pump.
NFPA 20, 2007 - 12.6.13 Sole Supply Pumps. 12.6.13.1 For sprinkler or standpipe systems where an automatically controlled pumping unit constitutes the sole supply, the controller shall be arranged for manual shutdown. QUESTION: We need to reconcile whether the IPC means that the fire pumps is to be de-energized (automatically shutdown) if a low pressure event occurs or of a Low Suction Throttling Valve is installed that the pump would continue to run and the LSTV would limit discharge in the event of a low suction pressure condition. If NFPA 20 is to be followed I read that automatic shutdown is not permitted. There will be Reduced Pressure Backflows installed on the suction side of the fire pumps per the local water purveyor. Is there a conflict here or is the LSTV the same as the "low-pressure cutoff" in the IPC or does the IPC section even apply to fire pumps? Comments......... Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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)
