Long drop pipe supports
Long drop pipe supports
(OP)
Hi everyone,
I have a dinning hall that has a ceiling height of 43 ft (13 m) which requires sprinkler protection as per NFPA. Ceiling panels are suspended at a height of 13 ft (4 m) above ground. These panels have width greater than 3.9 ft (1.2 m) and therefore are considered as obstruction to ceiling sprinkler spray pattern, and need to have sprinklers installed below them. These panels are distributed throughout the middle of the hall - at least 16 ft (5 m) between one another - and far away from walls or columns. The ceiling panels are supported to the ceiling above by four 6mm rods.
My question is, if my main pipe runs below the ceiling at 43 ft (13 m), then a long vertical drop pipe - around 30 ft ( 9 m) drop - will need to come down to connect to the sprinklers installed on the ceiling panels. How can I support these vertical drop pipes assuming they are 1" pipes? My concern is the vibration that will happen if the sprinklers connected to these pipes operate.
Appreciate your feedback.
I have a dinning hall that has a ceiling height of 43 ft (13 m) which requires sprinkler protection as per NFPA. Ceiling panels are suspended at a height of 13 ft (4 m) above ground. These panels have width greater than 3.9 ft (1.2 m) and therefore are considered as obstruction to ceiling sprinkler spray pattern, and need to have sprinklers installed below them. These panels are distributed throughout the middle of the hall - at least 16 ft (5 m) between one another - and far away from walls or columns. The ceiling panels are supported to the ceiling above by four 6mm rods.
My question is, if my main pipe runs below the ceiling at 43 ft (13 m), then a long vertical drop pipe - around 30 ft ( 9 m) drop - will need to come down to connect to the sprinklers installed on the ceiling panels. How can I support these vertical drop pipes assuming they are 1" pipes? My concern is the vibration that will happen if the sprinklers connected to these pipes operate.
Appreciate your feedback.





RE: Long drop pipe supports
Run a sub-main down longitudinal above the suspended ceiling panels and install your drops in the low ceiling from that main. If you size your pipe the same as the above you do not need a separate calculation.
RE: Long drop pipe supports
Is that acceptable?
RE: Long drop pipe supports
Not sure drops have to be supported.
I know sprig ups, after a certain length, have to be supported.
Need to check the book.
RE: Long drop pipe supports
I think that if the pipe or hanger is suspended for 9 m in mid-air, it will be subject to lateral movement.
RE: Long drop pipe supports
Rod is less expensive than pipe. If you can hang the pipe and running low is an acceptable option, I would run low. It seems that running a second complement of piping down low is actually less pipe than the running high would be.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
"Follow" us at https://www.facebook.com/pages/MFP-Design-LLC/9221...
RE: Long drop pipe supports
In addition I would add flexible drops to help the pendent sprinklers not sag beneath the suspended ceiling over time.
Sprigs over 4'-0" need braced against lateral forces 9.2.3.7 2013. I don't find anything about long drops needing braced. 9.3.2.3.1 (5) 2013 states to add flexible couplings to drops over 15' for seismic.
RE: Long drop pipe supports
RE: Long drop pipe supports
The ceiling brackets do a good job of helping to stabilize the drop in those situations.
Eric Hendrix, SET
NICET Certified
Design Manager
RE: Long drop pipe supports
RE: Long drop pipe supports