Table of Contents
Advertisement
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
Advertisement
Table of Contents
