b. If the level is below normal, add concentrate (per the “Refill Procedure” on page 18), to the de-
sired level. Again, follow the “Shell Water Refill Procedure” on page 13.
c. Drain concentrate from the level gauge by closing Valve No. 9, then slowly open Valve No.’s 7 and
3 (Figure 8).
Step 5: After concentrate is completely drained, close Valve No.’s 3 and 7.
NOTE: BECAUSE OF THE THICK VISCOSITY OF AR FOAM, THE SIGHT GLASS MAY NOT ACCURATELY MEASURE
THE LEVEL. TO DETERMINE THE AMOUNT OF CONCENTRATE INSIDE THE UNIT, CONTINUE TO FOLLOW THE
PROCEDURE ON “CONCENTRATE LEVEL CHECK,” BUT MEASURE THE AMOUNT OF WATER DRAINED FROM
THE SHELL.
EXAMPLE: THE DESIGNED CAPACITY OF AN 1800 HORIZONTAL UNIT IS 1800 GALLONS, THE ACTUAL
CAPACITY IS 1980 GALLONS. IF 180 GALLONS OF WATER IS DRAINED FROM THE SHELL, 1800 GALLONS OF
CONCENTRATE REMAIN. CONSULT VIKING FOR ACTUAL CAPACITIES OF AR UNITS.
13.0 REFILL PROCEDURE -
13.1 50% OR MORE DISCHARGED
This method is to be used when the tank has been isolated from the system water drained from the shell and
50% or more of the nominal tank volume has been discharged and determined. See page 15 for instructions on
concentrate level check.
Refer to page 9 for the schematic on pumping apparatus.
Step 1: Close Valves No.1, 2, 3, 6, and 7.
Step 2: Fill the tank shell with water through Valve No. 6 until water flows from Valve No. 4 and/or concentrate
from Valve No. 5. Close Valve No.’s 5 and 6.
Step 3: Proceed with “CCS Filling Procedure” on page 10, Steps 5 through 21.
13.2 LESS THAN 50% DISCHARGE
This method is to be used when less than 50% of the nominal tank volume has been discharged and determined.
See page 15 for instructions on concentrate level check.
Step 1: Close Valve No.’s 1, 2 (isolating the tank from the system), and 3.
Step 2: Open Valve No.’s 4, 5, and 6, and fill line master (No. 11 for AFFF units, No. 9 for AR units).
Refer to page 9 for the schematic on pumping apparatus.
Step 3: Attach a 3/4” clear flexible hose to Valve No. 5 and terminate into a 5 gallon bucket.
Step 4: Prime and connect the pumping apparatus to Valve No. 7. Start the pump, open Valve No. 7, and
pump concentrate to the rated capacity.*
Step 5: Refer to “Sight Gauge Procedure” (page 10) and “Shell Water Refill Procedure” on page 13.
13.3 AFFF FILL CUP PROCEDURE
This method can be used to add small volumes of AFFF concentrate. It is not recommended for initial filling of
the tank or for AR units.
15
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