Cory,
That is only for calculations using a fluid delivery time calculation
software. As Ron said when doing an IT it is always the smallest orifice
used to ensure a trip. These are two totally different issues. FYI.
Rod DiBona
Rapid Fire
-----Original Message-----
From: [email protected] [mailto:
[email protected]] On Behalf Of Cory Power
Sent: Tuesday, October 04, 2011 4:13 PM
To: [email protected]
Subject: Re: Equiv Orifice for OH Inspectors Test
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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