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Step 6b: Plumb the Nitrogen/Air Supply Line – With Separate Air Compressor (Figure 3b)
A separate air compressor can be used to meet the NFPA 13 30-minute fill requirement or as a back up to
the nitrogen generator. In this application, the nitrogen/air discharge plumbing from the Nitrogen
Generator and the separate air compressor are connected to the dry pipe or preaction valve trim with
isolation valves in each supply line using a minimum ½” black steel, galvanized steel, or copper lines. The
size of the nitrogen/air supply line must be based on both the length of pipe between the nitrogen
generator and fire sprinkler systems and the total volume of fire sprinkler systems being supplied.
NOTE: The Nitrogen Generator requires an in-line Air Maintenance Device (AMD) that is equipped with
an on-board field adjustable pressure regulator for each sprinkler system being served.
Acceptable AMD models are the Reliable Model A, Tyco Model AMD-1 and Victaulic Series 757.
Figure 3b
Step 6c: Plumb the Nitrogen/Air Supply Line – With House/Plant Air Supply (Figure 3c)
A separate house/plant air supply can be used to meet the NFPA 13 30-minute fill requirement or as a
back up to the nitrogen generator. In this application, the nitrogen/air discharge plumbing from the
Nitrogen Generator and the separate hose/plant air supply are connected to the dry pipe or preaction
valve trim with isolation valves in each supply line using a minimum ½” black steel, galvanized steel, or
copper lines. The size of the nitrogen/air supply line must be based on both the length of pipe between
the nitrogen generator and fire sprinkler systems and the total volume of fire sprinkler systems being
supplied.
NOTE: The Nitrogen Generator requires an in-line Air Maintenance Device (AMD) that is equipped with
an on-board field adjustable pressure regulator for each sprinkler system being served.
Acceptable AMD models are the Reliable Model A, Tyco Model AMD-1 and Victaulic Series 757.
Figure 3c
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