The concentrate displaces the shell water. If tank pressure steadily decreases, it will be necessary to partially
close Valve No. 4 to slow down the discharge of water. If tank pressure steadily increases, it will be necessary
to partially (or fully) open Valve No. 6 to allow the pressure to drop back to 10 PSI. Slowing the pump discharge
will also lower the tank pressure.
When approximately 75% of the nominal charge has been attained, (90% for horizontal tanks), shell water will
stop flowing and the tank pressure will begin to exceed 10 PSI.
Step 10: Partially open ¼” shut off at Valve No. 5 to vent and slowly allow air pressure to drop to 0 PSI while continu-
ing to pump the concentrate to the rated capacity.
IMPORTANT: IF CONCENTRATE OVERFLOWS FROM VALVE N|O. 5, DRAIN BACK SEVERAL GALLONS TO ALLOW
FOR EXPANSION OF AGENT. FILL ONLY TO RATED CAPACITY! OVERFILLING MAY DAMAGE THE BLADDER!
Step 11: Close Valve No. 7, shut off the pump, and remove ¼” valve and gauge assemble from Valve No. 5.
10.0 SIGHT GAUGE PROCEDURE
Step 12: Open Valve No. 3 (also Valve No.’s 8 and 9, if AFFF), and allow sight gauge to fill. Mark level for future
reference. Close sight gauge valves and drain concentrate from tube.
12
To Next Page
Loading...
Need help?
General