We are converting approximately 100 extended coverage, ordinary hazard upright sprinklers (off of a 1x3/4 bushing) to standard spray chrome pendents (light hazard).
The ceilings are approximately 6'-0" below the existing branchlines at the deck.
We are planning to use "2-Stage" drops where we add a 1" double elbow ( with a 1" close nipple) off the branchline, then drop down about 5'-0" to get down near the ceiling and terminate this with a 1" plugged elbow.
Then when the time comes, we will add a flexible sprinkler connector to this and fix the sprinkler in the suspended ceiling (ASTM C635 & C636).
If I use a 72" flexible connector, I understand I don't need a hanger per 188.8.131.52.3.3 (NFPA 13 2019).
If I use a 23" starter piece of pipe off the bottom of the drop, would I need to catch a hanger due to the total length of this assembly?
Or, since the flexible connector is 6'-0" and the starter pipe is 23" (Section 184.108.40.206.1) could I get away without an additional hanger?
Not that I'm planning to do this but just curious what people think?
Thanks in advance.
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