Reza, No I minute is OK. BUT be careful of over pressurization due to the high rate and high concentration. The intent was to allow designers some latitude when using very high concentrations thus minimizing pipe sizes and preventing over pressurization the room and popping windows and such. See venting consideration and calcs in 5.6
Most computer rooms are protected under the "Dry electrical Hazard" as you have done. I believe that you may take advantage of the extended discharge time if you wish or need to. Now the big question! Why CO2 when other clean agents are safer, cheaper and arguably the industry standard? Burton Ford SET, CFPS Member AFAA [EMAIL PROTECTED] 267-487-1000 Fax 267-487-1010 This e-mail transmission contains information that is intended to be confidential and privileged. If you receive this e-mail and you are not a named addressee you are hereby notified that you are not authorized to read, print, retain, copy or disseminate this communication without the consent of the sender and that doing so is prohibited and may be unlawful. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please delete and otherwise erase it and any attachments from your computer system. Your assistance in correcting this error is appreciated. Thank you. Cintas Corporation -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Reza Esmaeili Sent: Thursday, August 23, 2007 10:19 AM To: [email protected] Subject: Carbon Dioxide System Discharge Time Hi all, For designing a total flooding high pressure carbon dioxide system in a 3,500 cubic feet computer room with electrical equipment and cable runs, I have specified my room as "Dry electrical hazard" with flooding factor of 0.083 lb/cubic.feet and 50% design concentration according to NFPA-12. My questions are as below: 1)- Is a computer room fire a deep seated fire? 2)- NFPA 12 states that "For deep-seated fires, the design concentration shall be achieved within 7 minutes, but the rate shall be not less than that required to develop a concentration of 30 percent in 2 minutes." Is it a problem if the total discharge time would be only 1 minute for this case? Many thanks for your help in advance. Reza --------------------------------- Pinpoint customers who are looking for what you sell. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) This e-mail transmission contains information that is intended to be confidential and privileged. If you receive this e-mail and you are not a named addressee you are hereby notified that you are not authorized to read, print, retain, copy or disseminate this communication without the consent of the sender and that doing so is prohibited and may be unlawful. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please delete and otherwise erase it and any attachments from your computer system. Your assistance in correcting this error is appreciated. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
