NFPA 13 Table 7.2.3.6.1 Dry Pipe System Water Delivery
States Ordinary Hazard group 1 to have 2 most remote sprinklers
initially open with 50 second water delivery time
--
Cory Power
P& P Sprinklers Ltd
6 Main Rd
Chapel Arm, NL A0B 1L0
Ph: (709) 592-2029
Fax: (709) 592-2019
On 10/4/2011 7:38 PM, Ron Greenman wrote:
I'm afraid you always use the single smallest orifice in the system as you
IT test orifice and one only, no matter the hazard. The objective is to
insure that trip time or alarm initiation occurs within the allotted time
if only one head of the smallest orifice type in the system is flowing.
On Tue, Oct 4, 2011 at 2:57 PM, Cory Power<[email protected]> wrote:
Doesn't Ordinary Hazard require two flowing heads?
--
Cory Power
P& P Sprinklers Ltd
6 Main Rd
Chapel Arm, NL A0B 1L0
Ph: (709) 592-2029
Fax: (709) 592-2019
On 10/4/2011 7:24 PM, Ron Greenman wrote:
This may be a dumb question but if it's a system with 5.6K heads as the
smallest orifice then it needs to alarm (AV) with one head flowing or trip
(DPV) with one head flowing. Why would you have two heads for the IT?
On Tue, Oct 4, 2011 at 2:48 PM, Cory Power<[email protected]> wrote:
The reason I'm asking is because it is an ordinary hazard system and in
the plans they spec the inspectors test routing to a hub drain in a
janitors
closet. It would be much easier to have one 11.2k orifice above the hub
drain than two 5.6 k's.
--
Cory Power
P& P Sprinklers Ltd
6 Main Rd
Chapel Arm, NL A0B 1L0
Ph: (709) 592-2029
Fax: (709) 592-2019
On 10/4/2011 6:07 PM, Justin Reid wrote:
The Q=k*sqrt(p) math says that it should be equal flow with equal
pressure.
I guess you would have slightly less pressure with the 11.2 since there
is
more flow(friction).
I just had an issue yesterday trying to get a flow valve to trip with a
remote test (one head) and thought the same thing (to look at using two
heads).
Good luck,
Justin Reid
On Tue, Oct 4, 2011 at 1:13 PM, Cory Power<[email protected]>
wrote:
Just wondering if anyone have used an 11.2 K Orifice to substitute for
two
5.6 k heads on an OH1 Dry Inspectors test? Shouldn't it be equivalent?
--
Cory Power
P& P Sprinklers Ltd
6 Main Rd
Chapel Arm, NL A0B 1L0
Ph: (709) 592-2029
Fax: (709) 592-2019
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