-----Forwarded Message----- >From: Larry Shulman <[email protected]> >Sent: Oct 27, 2009 3:42 PM >To: ParsleyConsulting <[email protected]> >Subject: Re: FM's Max. Velocity > >Ken; FM Global dropped velocity requirements for sprinkler systems a quarter >century ago. That would explain why DS 2-8N is silent on the topic. Remember >that DS 2-8N (really FM's footnoted NFPA Standard 13) is just an installation >standard, and not a design standard. It is weak on explaining the concepts on >system design. FM's answer to that weakness was the development of DS 3-0, >which was already in place when I joined FM in 1977 and spent 32 years there. > >We'll have to await the release of new DS 2-0 soon to see what commentary is >provided on this subject, but I wouldn't expect any real change. > >You might have overlooked the statement "There is no need to use velocity >pressure in sprinkler system calculations" in the last paragraph of page 39. > >-----Original Message----- >>From: ParsleyConsulting <[email protected]> >>Sent: Oct 27, 2009 3:12 PM >>To: [email protected], Larry Shulman >><[email protected]> >>Subject: Re: FM's Max. Velocity >> >>Larry, >> >>I'm not sure everybody has it wrong. I think several people have noted >>that there are no longer the limits on velocities in risers, overhead >>mains, and branch lines as there were previously. In looking at the >>last copy of 2-8N that I have there is no mention of it as well. >> >>The information you referred to in 3-0 on page 39 and subsequently in 40 >>is not by any stretch a rule for velocity in a sprinkler system, but is >>more appropriately described as a means of performing hydraulic >>calculations where velocity pressures are taken into account, which is >>quite a different matter altogether. >> >>Those are just my thoughts. >>-- >>PARSLEY CONSULTING >>Ken Wagoner, SET >>760.745.6181 voice >>760.745.0537 fax >>[email protected] <mailto:[email protected]> e-mail >>www.ParsleyConsulting.com <http://www.ParsleyConsulting.com> website >> >> >>Larry Shulman wrote: >>> Well, everybody here has got it wrong so far. The FM Global rules for >>> velocity in sprinkler systems (there really are none) can be found in Data >>> Sheet 3-0, near the bottom of page 39. Velocity for fire pumps is 15 >>> ft/sec and is found in DS 3-7, page 9, and the velocity for underground >>> mains is 20 ft/sec and is found in DS 3-10, page 8. >>> >>> >>> -----Original Message----- >>>> From: Todd Williams <[email protected]> >>>> Sent: Oct 27, 2009 2:19 PM >>>> To: [email protected] >>>> Subject: Re: FM's Max. Velocity >>>> >>>> If there is any (and I don't believe so), it is probably 2-8N >>>> >>>> >>>> At 04:00 PM 10/27/2009, you wrote: >>>> >>>>> Can someone tell which FM Data sheet talks about the max velocity in a >>>>> wet system? >>>>> >>>>> >>>>> >>>>> Mike Brown >>>>> >>>>> Project Designer >>>>> >>>>> Sunland Fire Protection >>>>> >>>>> 1218 Elon Place >>>>> >>>>> High Point, NC 27263 >>>>> >>>>> Ph. 336.886.7027 Ext. 140 >>>>> >>>>> Fax: 336.886.7024 >>>>> >>>>> WWW.SUNLANDFIRE.COM <http://WWW.SUNLANDFIRE.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) >>>>> >>>> Todd G. Williams, PE >>>> Fire Protection Design/Consulting >>>> Stonington, Connecticut >>>> www.fpdc.com >>>> 860.535.2080 >>>> _______________________________________________ >>>> 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) >>> >>> > >
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