Here is one that relies on an interpretation of the code from its literal verbiage. NFPA 13: 8.15.19.5 states "When hydraulically designed systems are revamped, any existing bushing shall be removed and a nipple not exceeding 4 in. (100 mm) in length shall be permitted to be installed in the branch line fitting." This has historically been taken to mean that a 4 inch by 1/2 inch nipple can be installed in an existing 1 X ! X 1/2 tee to provide an armover for a pendent sprinkler to a ceiling below.
However, this is not what the code states. NFPA 13 is relating to a bushing that was installed in an unfinished space. In fact, it does not state what size nipple is acceptable except that it cannot be less than 1 inch if it is in an earthquake zone. As I read it, you cannot just remove an upright sprinkler and install a 1/2 inch nipple connected to a 1/2 to 1 inch increaser and drop it to the ceiling below. What is the consensus and/or did the standard change sometime ago? Thank You Rahe Loftin, P.E. Region 7 - GSA Office - 817-978-7299 Fax - 817-978-8644 Cell - 817-371-3102 _______________________________________________ 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)
