So you run new UG into a building that was legally pipe schedule because the calc (that wasn't required under the valid but old design criteria) doesn't work? It doesn't have to, its designed to the applicable code at installation.
George Church' Rowe Sprinkler [email protected] 570-837-7647 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Wednesday, January 12, 2011 12:20 PM To: [email protected] Subject: Re: Hydraulic Calcs Ok, so in Doug's situation, it constitutes a new installation and not repair work (based on your first statement) and it is based on a prior design. However, as a new installation wouldn't the design need to meet current Codes irregardless of when the design was done and probably require hydraulic calculations? At 12:04 PM 1/12/2011, you wrote: >well you know the answer to the first one (as a NEW installation using >the prior design). If you are not changing like for like, I would >inform the AHJ of the change and explain why it does not need extensive >verification. Galvanized pipe has less friction loss so no problem. >Changing from sch 10 to sch 40, not so good unless up-sized etc etc > >Roland > >On Jan 12, 2011, at 8:43 AM, Todd Williams wrote: > >>So where is the cut-off between repair and new installation? If you >>replace all of the existing pipe, fittings, sprinklers and hangers, >>etc. with exact new duplicates in an existing 30,000 building, is that >>a repair? If you replace some black steel pipe with galvanized, does >>that now become a new installation? >> >> >>At 11:32 AM 1/12/2011, you wrote: >>>NFPA 25 does not require verification for repair work (provided you >>>are replacing like with like). Verification of adequacy per >>>specification is a different story that may have nothing to do with >>>what is required by the standards. Some reasons can be less than >>>honorable. >>> >>>Roland >>> >>> >>>On Jan 12, 2011, at 8:14 AM, Doug Hicks wrote: >>> >>>>The dry pipe protects the overhang of a walkway, no attic. the >>>>original install is about 20 years old. About 6 years ago, 2 more >>>>low hazard buildings were built and the dry pipe system was >>>>extended. The 2 new buildings are each protected by a separate wet >>>>system. All the fire water comes from the original street >>>>connection. The extension increased the protected area about 35-40 >>>>%. I assume hydraulic Calcs were done by a licensed person. I tried >>>>to type that with a straight face. No increase in pipe sizes were >>>>done. I do not know what edition of 13 was used for any of the >>>>sprinkler work. I doubt that any water supply information is on >>>>file anyplace. So if Calcs are needed, I will have to have a >>>>qualified person do that for me. My local AHJ allows do whatever I >>>>want. So the decision will be up to the client and his engineer. >>>> >>>>I will print this out, we have a meeting at 9:00 AM. After the >>>>meeting I am sure I will have more questions. >>> >>>_______________________________________________ >>>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, CT >>860.535.2080 >>www.fpdc.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) Todd G. Williams, PE Fire Protection Design/Consulting Stonington, CT 860.535.2080 www.fpdc.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)
