Final fire sprinkler inspection passed/complete

Todays inspection was for flow verification of the foam system. This verification failed. See the plan reviewer attached notes on the specificsof what was witnessed

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Below add by Plan Reviewer TRF

Based on the following the foam test PASSED.

NFPA 409 6.1.1 (3)
NFPA 409 6.2.5.3 (withing 5' in 3 minutes)
NFPA 409 6.2.5.5.1 (local application, NFPA 11)
NFPA 11 6.13.3.3.1 (2 ft within 2 min)
The requiment of 2' of foam was met in 1:50 seconds.

Overhead hydro tests of the four foam systems (DDX valves) passed.

Todays inspection was for certification of the 3 fire pumps. Inspection passed. We found that all three pumps are 3psi to 7psi above on Churn. Both diesel pumps are 4psi to 5psi low at 150%. After conferencing with Tim Frost and Gary with Tolco pumps that this is still acceptable. We actually moved the guages and gained acouple of psi.

Todays inspection was for the hanger area. Rough-in passed. Mike is going to provide verifircation that the two tech screws used for the 2" branchline hanger is approved. I need to verify that hanger clips are not required (data sheet provided with submittal)

Rough-in of grid ceiling areas OK to cover. One sprinkler head overspaced in front office (south west of main door). Needs to be adjusted left to the adjacent 2x2 grid per drawing..

all requirments met

See attached document

Question and Answers from meeting via email.


Jeff,

Per NFPA 22 the tanks is required to be heated.

16.1.1 Tanks that are subject to freezing shall be heated.

The verbiage below or something similar is in many NFPA, if not all

1.4 Equivalency. Nothing in this standard is intended to prevent the use of systems, methods, or devices of equivalent or superior quality, strength, fire resistance, effectiveness, durability,
and safety over those prescribed by this standard.

Jeff, you need find me some test results that show equivalency. The test results would need to be sealed and dated by a FPE, stating heating of the tank is not required. I can than review the information, and get fire code official approval, if it checks out satisfactorily.


Discharging back into the tank is fine. However, the nozzles discharging back into the tank are required to be listed and rated for 175%.

NFPA 20: 4.20.2.1* Metering devices or fixed nozzles for pump testing shall be listed.

NFPA 20: 4.20.2.2 Metering devices or fixed nozzles shall be capable of water flow of not less than 175 percent of rated pump capacity.

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4.7.7* Maximum Pressure for Centrifugal Pumps.
4.7.7.1 The net pump shutoff (churn) pressure plus the maximum
static suction pressure, adjusted for elevation, shall not exceed
the pressure for which the system components are rated.
4.7.7.2* Pressure relief valves and pressure regulating devices
in the fire pump installation shall not be used as a means to
meet the requirements of 4.7.7.1.

4.18.1.1* Pressure relief valves shall be used only where specifically
permitted by this standard.
4.18.1.2 Where a diesel engine fire pump is installed and where
a total of 121 percent of the net rated shutoff (churn) pressure
plus the maximum static suction pressure, adjusted for elevation,
exceeds the pressure for which the system components are rated,
a pressure relief valve shall be installed.
4.18.1.3 Where an electric variable speed pressure limiting
controller or a diesel pressure limiting driver is installed, and
the maximum total discharge head adjusted for elevation with
the pump operating at shutoff and rated speed exceeds the
pressure rating of the system components, a pressure relief
valve shall be installed.

If you comply with the above, it seems NFPA 20 does not require a main relief valve.

You said 209#. The pipe and fittings will probably be ok. But what about the pressure switch, sprinklers, etc?

You will still of course still need a Circulation Relief Valve to keep the pump from overheating.

4.18.8* Discharge to Suction Reservoir. Where the supply of
water to the pump is taken from a suction reservoir of limited
capacity, the drain pipe shall discharge into the reservoir at a
point as far from the pump suction as is necessary to prevent the
pump from drafting air introduced by the drain pipe discharge.

You were concerned about the wasted water. It appears, you could simply discharge back to the tank.

I am still looking in the combustion air issue

Cordially,

Tim Frost, S.E.T.
Fire Sprinkler Plans Examiner
Fire Code Plans Examiner
Fire Inspector

City of Boise
tfrost@cityofboise.org
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6.9 Air Supply.
6.9.1 Air from outside the hazard area shall be used for foam
generation unless data is provided to show that air from inside
the hazard can be successfully employed.
6.9.2 The data shall be specific for the products of combustion
to be encountered and shall provide factors for increasing
foam discharge rates over those given in 6.12.8 if fire tests
indicate that need.
6.9.3 Vents from the fire area shall be located to prevent recirculation
of combustion products or other materials deleterious
to the formation of foam into foam generator air inlets.

The above would seem to pertain to your situation.