Yeah, it goes back to structural, physical separation of the pipe from the hazard, not special bracing.
Craig Prahl CH2MHILL/SPB 864-599-4102 ________________________________________ From: [email protected] [[email protected]] On Behalf Of Richardson, R [[email protected]] Sent: Friday, November 12, 2010 10:00 AM To: [email protected] Subject: RE: Seismic Question Sounds like an ill-defined requirement at best. However, if you dig into Factory Mutual Data Sheet 2-0 Installation Guidelines for Automatic Sprinklers, it will send you to DS 7-14 for pipe subject to explosions that offers the following: (I have no idea if this meets your spec though) Rich Richardson Seattle Fire Department ******************************************************************************** Excerpt from Factory Mutual Data Sheet 7-14 2.4.3 Protection of Piping, Valves and Fittings Against Damage from Explosions 2.4.3.1 Risers should be located in areas cut off by pressure resistant walls or shielded by structural columns. 2.4.3.2 Feed and cross mains should be located away from reactors or pressure vessels insofar as it is practical (e.g., in the aisles or off to the sides of reactors or pressure vessels but never directly above this equipment). 2.4.3.3 Generally, water supply mains to hazardous process areas should be buried, looped, and equipped with divisional valves so that any breaks due to explosion damage can be isolated. 2.4.3.4 All piping over 2 in. (51 mm) should be welded or have welded flanged fittings. Welding should conform to the ANSI/ASME standard for pressure piping, B31.1 Power Piping. Welded flanged fittings should conform to ANSI/ASME Standard B16.9 Factory-Made Wrought Steel Buttwelding Fittings; or ANSI/ASME Standard B16.25, Buttwelding Ends. Welding should be prohibited in an occupied structure; however, welded subassemblies may be prepared outside the area and assembled (flanged) within the area. Piping 2 in. (51 mm) or smaller may be welded; otherwise malleable iron on steel fittings of 150 lb steam rating (300 lb W.O.G. rating) should be used. These fittings should conform to ANSI/ASME Standard B16.3, Malleable Iron Threaded Fittings, 150 and 300 lb; or ANSI/ASME Standard B16.5, Steel Pipe Flanges and Flanged Fittings. Flexible couplings should not be used. 2.4.3.5 Piping should be supported from the building or structural framework; however, outdoor piping may be attached to self-supporting process equipment. 2.4.3.6 For processing structures located indoors or outdoors, a readily accessible manual shutoff valve should be provided for each system. All manual shutoff valves and automatic sprinkler control valves (alarm check, deluge, etc.) should be located at least 50 ft (15.2 m) from the building or structures. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, November 11, 2010 13:30 To: [email protected] Subject: RE: Seismic Question Man don't even mess with this. This is obviously an engineer who is lost in space. There is no way to protect pipng from a blast unless someone is providing explosion resistant structure between the blast hazard and the pipe. In no case is there any way to protect piping from a blast when it's directly exposed. It's just stupid to even ask for such a thing. The chracteristics of the explosion, direction, mass displacement, building damage, etc., etc. can not be accounted for by "Bracing". Ask this genius what he has in mind, it will probably not be anything since he figures you're the contractor and should be all knowing in this matter. Geez.................... Craig Prahl CH2MHILL/SPB 864-599-4102 ________________________________________ From: [email protected] [[email protected]] On Behalf Of Cliff Whitfield [[email protected]] Sent: Wednesday, November 10, 2010 5:58 PM To: [email protected] Subject: Seismic Question I have an unusual situation on a project and would like some opinions. We are currently doing a project where seismic bracing has been specified for 'blast protection' (or something like that). The project is not in a zone that would otherwise require seismic protection. So here is my question. Are restraining straps required to be installed on the beam clamps? Now before you answer, consider this - NFPA 13 2007 - 9.3.7.1 - C-type clamps ... used to attach hangers to the building structure IN AREAS SUBJECT TO EARTHQUAKES shall be equipped with a retraining strap. Ok, now what is your opinion? Thanks, Cliff Whitfield, SET President Fire Design, Inc. 850-526-1886 [email protected] www.fire-design.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) _______________________________________________ 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)
