Paul and Chief Life Safety Engineer, Maybe you have not designed jobs to actually be installed in the field, but chances are the building will not get built exactly as the plans indicate, the HVAC will not get installed exactly as the plans indicate and so on... AND THE FIRE PROTECTION MAY NOT GET INSTALLED EXACTLY AS IT IS DRAWN, which means the fitters may have to add a few 90's, etc. and that is way a safety margin of 10% is not only a good practice, but possibly to make sure of changes in the field will still allow the system to function properly and put out a fire if needed. Kathryn
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Pinigis Sent: Friday, March 16, 2007 7:14 AM To: [email protected] Subject: RE: Minimum Supply Pressure We have an AHJ who has developed a "god complex" from years of having contractors, engineers, and building owners bow down to kiss his feet and satisfy his every whim. It is now at the point that he believes that it is his prerogative to choose the construction type of the building, the type of smoke detection system that is used, the manufacturer of the fire alarm system, etc.! The AHJ is there to enforce the code, not to reinvent it. Paul J. Pinigis, P.E. Chief Life Safety Engineer -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Friday, March 16, 2007 10:05 AM To: [email protected] Subject: RE: Minimum Supply Pressure I know the municipal AHJ issue has been discussed before. When the AHJ asks for something and denies a C.O. based on your refusal to provide what was asked, it's often easier to comply if it's not a liability or cost issue. Most owners don't appreciate a delay in occupying their facilities based on the legality of what the AHJ can or cant legally ask for. Sure we would like to push back and fight it, but the reality is sometimes that's not practical or feasible. The owner may never see you again after your job is done but he'll probably see that fire marshal every year. Also the term AHJ can also apply to a corporate life safety manager or other corporate entity for companies who are self-insured and self sufficient, i.e. no interface with local municipalities, they have their own private water supplies, private fire brigades, etc. Craig L. Prahl, CET Fire Protection Group 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.lg.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Pinigis Sent: Friday, March 16, 2007 9:54 AM To: [email protected] Subject: RE: Minimum Supply Pressure Yes, the insurance underwriters can add their requirements, but the AHJ cannot. The AHJ is tasked with enforcing the adopted codes, not inventing new ones or adding his/her personal preferences. The code does not demand a pressure cushion, neither can the AHJ. Paul J. Pinigis, P.E. Chief Life Safety Engineer -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Friday, March 16, 2007 9:41 AM To: [email protected] Subject: RE: Minimum Supply Pressure Also, some insurance underwriters and AHJ's have requirements relating to particular required safety factors in the calcs. Don't forget to check with them as well. Craig L. Prahl, CET Fire Protection Group 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.lg.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Pinigis Sent: Friday, March 16, 2007 9:31 AM To: [email protected] Subject: RE: Minimum Supply Pressure If you can achieve 10% without spending your client's money (or your own) great, but it is not necessary. Paul J. Pinigis, P.E. Chief Life Safety Engineer -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Harris Sent: Friday, March 16, 2007 9:29 AM To: [email protected] Subject: RE: Minimum Supply Pressure 10% is what we go by, based on your numbers your only at around 2% :( Regards, Brian Harris First Defense Fire Protection Design Engineer [EMAIL PROTECTED] 704.948.3506 phone 704.948.3507 fax -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Charles Thurston Sent: Friday, March 16, 2007 10:19 AM To: [email protected] Subject: Mininum Supply Pressure Hello All, Let me be the one to start things today. What is the minimum safety pressure allowed ? I have looked in 13 and did not find it.... I have a situation where the safety pressure is 0.913 psi. Basis is: Hose 250 Static 67.00 Residual 38.00 @ 920.00 Available 40.128 @ demand of 882.87 Requires 39.215 psi Leaving a safety of 0.913 psi -- Best regards, Charles mailto:[EMAIL PROTECTED] Coastal Fire Protection _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
