Rack storage design
Rack storage design
(OP)
NFPA 13 2002 EDITION States
8.16.5 Hose Connections.
8.16.5.1.3 Hose connections shall be supplied from one of
the following:
(5) In rack storage areas, the ceiling sprinkler system in the same area (as long as in-rack sprinklers are provided in
the same area and are separately controlled)
Does this mean if I have a Rack system(valve controled Riser) supplied from the bottom of the 6" riser that covers dericly over the racks, I can supply the hose valves from that system?
Also can someone tell me, if I supply the rack system off the bottom of the (E) 6" riser with new control valve and flow switch do I have to calc both systems flowing together?
Can I just calc the racks per FM Global Standards @ 8 sprinklers in one level @ 30 psi and leave the Clg. Sprinkler system @ .60/2000.
Thanks for everything
8.16.5 Hose Connections.
8.16.5.1.3 Hose connections shall be supplied from one of
the following:
(5) In rack storage areas, the ceiling sprinkler system in the same area (as long as in-rack sprinklers are provided in
the same area and are separately controlled)
Does this mean if I have a Rack system(valve controled Riser) supplied from the bottom of the 6" riser that covers dericly over the racks, I can supply the hose valves from that system?
Also can someone tell me, if I supply the rack system off the bottom of the (E) 6" riser with new control valve and flow switch do I have to calc both systems flowing together?
Can I just calc the racks per FM Global Standards @ 8 sprinklers in one level @ 30 psi and leave the Clg. Sprinkler system @ .60/2000.
Thanks for everything





RE: Rack storage design
Yes.
Always calc both systems together. The .60/2000 is high for a system with sprinklers in the rack though. Depending on what you got the overhead might be half that density or even less.
RE: Rack storage design
Should the riser calc plate show the demand of both flowing together? This is what has me confused.
Also I know what you mean, the CMDA .60/2000 is required per FM Global data sheets 8-9 Dated May 2008 with 1 row of IRAS for plastics stored up to 25'.
RE: Rack storage design
Yes, feed the rack from the overhead
You mean the Hose rack and not the rack storage correct?
Thanks again!
RE: Rack storage design
"You mean the Hose rack and not the rack storage correct?"
Yes, hose rack from the overhead.
Rack sprinkler system must be fed from a separate riser (manifold does this well) so if overhead is turned off the rack sprinklers will still operate; if rack sprinkler is disabled, as often happens with fork lifts, the overhead sprinkler system and hose racks will remain in service providing partial protection.
With a density of ,60/2000 it appears the overhead sprinkler was designed before storage racks came into the picture. Maybe someone can correct me but I can't think of a situation where that kind of density would be needed in conjunction with in-rack sprinklers. I am almost positive the requirement will be much lower than what's on the placard.
Overhead and in-rack sprinklers must be added together at the point of connection which, in this case, is near the base of the riser.
Assume your overhead requires 550 gpm @ 102 psi (at the manifold connection) and your in-rack sprinkler requires 225 gpm @ 52 psi.
Total water requirement is going to be a lot more than 775 gpm.
k=q/sqrt p
k=31.20
q=k*sqrt p
q=315.1
In this scenario the total water requirement, at the point of overhead and in-rack sprinkler connection, will be 865.1 gpm.
RE: Rack storage design
The design is for 25' max storage. 30' max Bldg. height.
Im really looking @ .60/1500 with 1 row of IRAS(E).
(E) means sprinklers located in every transverse flue space.
Sorry for the miscommunication but is still a very high demand required.
Also the new FM data sheets require that the 8 IRAS be calced @ 30 psi instead of the 15psi shown. The existing calc plate on the riser was performed in May of 06.