NOZZLE MIX SYSTEMS
air
16 osi
3D
5D
4 pipe dia.
2 osi minimum drop
10 pipe dia.
19 osi
16 osi
16 osi
GAS PRESSURE REQUIREMENTS FOR CROSS-CONNECTED AIR/GAS RATIO REGULATORS
Operation of this system depends on an adequate gas supply pressure. With 16 osi impulse the regulator will open until an outlet pressure of 16 osi is reached. If the regulator is sized to take a 2 osi pressure drop at full fire conditions, an inlet pressure of 18 osi or more is required. A little extra inlet pressure is desirable as a safety factor; thus . . .
Air pressure..................................................................16 osi Pressure drop through regulator.............................. 2 osi Safety factor................................................................. 1 osi Required supply pressure . 19 osi or, if a regulator is sized for a 6 osi drop............16 osi 6 osi 1 osi 23 osi
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