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Section 11 - Nitrogen Generator Leak Check Method
1.
First isolate the nitrogen generator from the fire protection system, by closing the ball valve located on the outlet
of the nitrogen storage tank. If no ball valve was installed, close the AMD valves installed between the sprinkler
system and the nitrogen generator.
2.
Record the time the nitrogen generator was isolated and the sprinkler system supervisory pressure. This will be
used to determine if there is a leak on the sprinkler system side.
3.
Power OFF the nitrogen generator.
4.
In the cabinet, open the Bypass Valve (Yellow Handle).
5.
Close the Nitrogen "Inlet" Valve (Blue Handle) and the Nitrogen "Outlet" Valve (Blue Handle).
6.
Close the Nitrogen Test Port Valve (Green Handle).
7.
Exhaust all the gas by using the petcock on the bottom of the air storage tank.
8.
Exhaust all the gas by using the petcock on the nitrogen storage tank.
9.
Power ON the nitrogen generator. The Power On light on the outside of the cabinet should turn green.
10.
Allow the pressure in the air storage tank and the nitrogen storage tank to rise. The green Nitrogen Solenoid
light should be ON.
11.
Once the air compressor and Nitrogen Solenoid light have both turned off, record the pressure on the air storage
tank and the nitrogen storage tank. This should typically take 7 minutes for the NGP-1000D-M2/M3.
12.
Let the nitrogen generator sit for 30 minutes. The air compressor or the Nitrogen Solenoid light should NOT
turn on during this time.
13.
Recheck the air storage tank and nitrogen storage tank pressures. The pressure should not change.
a.
If there is a pressure drop the nitrogen generator has a leak. Soap the fittings in the unit and retighten
any fittings that are loose.
b.
If there is no pressure drop, this indicates there is a leak on the sprinkler system side. Return to the
sprinkler system to see if there has been a pressure drop on the system during troubleshooting. Fix
sprinkler leaks before putting the nitrogen generator back into service.