Presumably the fire pump only runs when there is a fire, i.e.: emergency, (not counting various tests). Since a low pressure condition is ultimately an exposure issue (my pump effects your stuff) and so is the fire (my fire effects your community) and the pump is a measure to mitigate against the second exposure but may create or exacerbate the first which is the more hazardous if both occur simultaneously? Does the municipality require such devices on hydrants or pumpers? If NFPA 20 is an adopted standard in the building code does it have precedence over the plumbing code, or vice versa, or is their a hierarchy at all? As usual no answers, just more questions.
On Wed, Mar 31, 2010 at 2:36 PM, <craig.pr...@ch2m.com> wrote: > 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 > craig.pr...@ch2m.com > http://www.ch2m.com > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: SFPE, ASCET, NFPA, AFSA, NFSA AFAA, NIBS, WSAFM, WFC _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: supp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field)
