9.2.3.5.2.1 Where the maximum static or flowing pressure, whichever is greater at the sprinkler, applied other than through the fire department connection, exceeds 100 psi (6.9 bar) and a branch line above a ceiling supplies sprinklers in a pendent position below the ceiling, the cumulative horizontal length of an unsupported armover to a sprinkler or sprinkler drop shall not exceed 12 in. (305 mm) for steel pipe and 6 in. (152 mm) for copper tube.
It says cumulative horizontal length. So, if you have 20" of total horizontal length, you need a hanger.
On 3/24/2011 1:40 PM, Shawn Chapman wrote:
Would a hanger be required on an armover such as described below? System has 150 static, so the 12" rule comes into play (pendant head in ceiling...). center of tile job has a 10" armover piece of 1" coming off of the branchline (no hanger). From there, swing joint 90's and 10" of pipe w/ 90 down to head (also-no hanger). I feel a hanger is required. Any opinions? _______________________________________________ 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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