Here's what NFPA 22 & 16 Says, NFPA 22, 2008 7.7.1* General. Pressure tanks shall be constructed in accordance with the ASME Boiler and Pressure Vessel Code, “Rules for the Construction of Unfired Pressure Vessels,” Section VIII, Division 1, Unfired Pressure Vessels. 7.2.7 Safety Appliances. 7.2.7.1 A brass relief valve not less than 3⁄4 in. (19.1 mm) in size that is set to operate at a pressure that is 10 percent in excess of the normal tank pressure shall be placed in the air supply pipe between the check valve and the air compressor. 7.2.7.2 There also shall be a brass relief valve not less than 11⁄2 in. (38.1 mm) in size at the filling pump that is set to relieve pressures that are 10 percent in excess of the pressure at the pump when the tank is under normal working pressure. 7.2.7.3 No safety appliances shall be installed between the tank and other valves. Obviously a bladder tank has no "Air supply pipe" and bladder tanks don't have "filling pumps" usually So I guess whatever part of ASME applied is where the requirement would come from.
NFPA 16 5.7.4 Pressure-Type Storage Tanks. 5.7.4.1* Pressure-proportioning tanks shall have means for filling, for gauging the level of foam concentrates, and for drainage, cleaning, and inspection of interior surfaces and of the concentrate-holding bladder or diaphragm, if provided. 5.7.4.2 These tanks shall be stamped to be identified as meeting the requirements of ASME Boiler and Pressure Vessel Code, Section VIII, Division 1.(Vikings Foam bladder tanks are 1.3X the rated pressure) (I believe that this will push you back into the relief valve, same as for 22) Most States have their "Boiler" Inspectors inspect pressure vessels because they are the most familiar with the ASME Boiler & pressure vessel code. Another one of those "install to ASME" without enough guidance or list of any exclusions. Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, December 07, 2009 7:58 AM To: [email protected] Subject: foam-water bladder tank pressure safety valve Does a State Boiler inspector have any jurisdiction over a foam-water bladder tank? Question has come to surface concerning the requirement for a pressure safety valve on the tank, when it's required (which apparently is always according to the inspector it must be ASME labeled.) Site residual pressure is 130 psi, static is 160psi , system is fed by diesel fire pumps, private loop. Pumps have PRV's on them. Is this guy out of his element? Anyone actually ever completed and submitted pressure relief valve calculations with a submittal? This is the first time I've ever had any inspector question this issue. 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) _______________________________________________ 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)
