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INS-1500 & INS-2000 • 5403646 • REV F • 04/19
Purging with Potter Nitrogen Purge Valve (NGP-SPV):
1. See Bulletin #5401520 for full details on installing and purging of the NGP-SPV.
2. Go to the end of the sprinkler system(s) where the NGP-SPV(s) is installed. Each riser should have one NGP-SPV purge
valve.
3. Open the ball valve on the NGP-SPV.
4. Ensure the NGP-SPV is installed properly. Installing the valve upside down will cause the unit not to purge. Any trapped
water in the piping will also cause the unit not to purge.
5. Unscrew the 1/2" pipe plug located at the end of the NGP-SPV.
6.
Check to ensure flow is coming out the purge valve.
7.
If the sprinkler system is pressurized, listen for flow. You may also use your fingers to feel for flow. If no flow is present,
there is a blockage such as a shut ball valve, water in the pipe, or a clogged orifice upstream.
8. Wait approximately 14 days before returning to the job site and checking the exiting gas with the Portable Nitrogen Analyzer.
9. Check the nitrogen purity to ensure the exiting gas is 98% or greater.
10. If the gas is 98% purity or greater close the ball valve and screw the plug back in. The system is purged.
11. If the nitrogen purity is 85% or greater, wait another 7 days before returning to the site and rechecking. Some larger systems
may have longer purge times.
12. If the nitrogen purity is around 80% it indicates that there is a blockage in the sprinkler system piping, the ball valve is closed
on the purge valve or that your nitrogen generator is in Bypass Mode.
Fig. 32