I didn't say I agree with the use of black pipe in dry systems. I prefer galvanized. I am just making the statement that there is no NFPA requirement that mandates the use of Galvanized pipe in dry pipe systems. As far as the use of black steel in dry systems being permitted a precedent has been set in chapter 14 table 14.4.4.5 in the 2002 edition. The Hazen-Williams coefficient for dry pipe is: 100 for black steel and 120 for galvanized.
Mark E. Eckard S.E.T. Engineering Manager Lowe's Companies 1605 Curtis Bridge Road REEC Dock Wilkesboro, N.C. 28697 Phone: (336) 658-4359 Fax: (336) 658-3257 Cell: (336) 467-0194 Email: [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, May 19, 2008 11:50 AM To: [email protected] Subject: RE: Missing Yes that section with that wording is just under the heading of Large Drops. But does the same concern not apply for any other type heads on dry sprinkler systems? So if you take it to it's literal extreme, dry sprinkler systems that utilize Large Drop sprinklers are the only systems subject to scale accumulation. Scale accumulation doesn't occur or is of no importance for standard 5.6K or 8.0K or X.XK sprinklers so no galvanized piping is necessary per the Standard? Really? Could someone explain the logic behind this? If you use regular black pipe and the supervisory air supply uses ambient air with no drier you can pretty much bet that over a period of time the interior of that pipe will rust and scale. The moisture in the supervisory air will contribute to that. So then would you would have compliance issues with 8.16.4.2. Your rust or corrosion isn't always from an external source, it could be from inside as well. Trying to save a few bucks at the front end could be costly down the road. Unfortunately many will be forced to save those few bucks up front if the code or standard doesn't particularly say it's required. Craig L. Prahl, CET Fire Protection Group 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 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eckard, Mark - Mark E Sent: Monday, May 19, 2008 9:53 AM To: [email protected] Subject: RE: Missing Read the FAQ information in the Handbook edition of the 2007 NFPA-13 8.4.7.2 this issue is addressed directly. "The use of internally galvanized steel piping materials applies only where large drop sprinklers are used. Dry pipe systems using other types of sprinklers are not limited to particular piping material but must comply with the requirements of section 6.3 and 6.4." Mark E. Eckard S.E.T. Phone: (336) 658-4359 Fax: (336) 658-3257 Cell: (336) 467-0194 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Knight Sent: Monday, May 19, 2008 9:27 AM To: [email protected] Subject: Missing George and Craig, Isn't this section that you referred to just for large drops? Bob Knight -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of George Church Sent: Monday, May 19, 2008 6:41 AM To: [email protected] Subject: RE: Missing And what Todd said about previous requirements by some insurance AHJs to use it preceded the 2007 #13 requirement. glc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, May 19, 2008 8:27 AM To: [email protected] Subject: RE: Missing 8.4.7.2 of the 2007 NFPA 13 states: 8.4.7.2* Galvanized Pipe. 8.4.7.2.1 Where steel pipe is used in preaction and dry pipe systems, piping materials shall be limited to internally galvanized steel. 8.4.7.2.2 Nongalvanized fittings shall be permitted. *A.8.4.7.2 The purpose of this requirement is to avoid scale accumulation. Craig L. Prahl, CET Fire Protection Group 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 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Coastal Sent: Sunday, May 18, 2008 8:40 PM To: [email protected] Subject: Missing Hello sprinklerforum, I think I am missing something. IF my old brain remembers it was a requirement for dry pipe systems to use Galvanized Pipe, But were allowed to use black iron fittings. I am unable to find that in the 2007 edition of 13, Am I dreaming, or was it deleted, or where is it now? -- Best regards, Charles Thurston CET Coastal Fire Protection mailto:[EMAIL PROTECTED] _______________________________________________ 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) _______________________________________________ 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)
