Step 17: Open Valve No. 1. Place all valves in normal position. Install all lock pins in proper locations (refer to
“Valve Descriptions” on pages 5-6).
Step 18: Inspect for piping leaks and correct, as necessary.
12.2 NORMALLY UN-PRESSURIZED
Step 19: Close all valves except for Valve No.’s 4 and 5.
Step 20: Open Valve No. 6 (allowing water into shell) until water overflows from Valve No. 4. Close Valve No.
6, then Valve No.’s 4 and 5.
VERIFY AUTOMATIC VALVE NO. 10 IS CLOSED (IF VALVE NO. 10 IS USED)!
Step 21: Open Valve No.’s 1 and 2.*
• There should be no water pressure on the tank. Lock all valves in proper locations (refer to “Valve Descriptions”
on page 5-6).
12.0 CONCENTRATE LEVEL CHECK
12.1 AFFF CONCENTRATE LEVEL CHECK (Refer to AFFF Schematic on Page 5)
Step 1: Close Valve No.’s 1 and 2 to isolate tank.
Step 2: Attach a hose to Valve No. 6 and terminate to drain. Be aware that the tank may be under pressure.
Step 3: Open Valve No. 6 carefully to relieve pressure. Once pressure is relieved, fully open Valve No. 6,
draining water from the shell, then slowly vent Valve No.’s 4 and 5.
Step 4: After the water has completely stopped draining, open Valve No.’s 3, 8, 9, and 11. Observe sight
gauge level (Figure 7).
a. If the level is normal, follow the “Shell Water Refill Procedure” on page 13.
b. If the level is below normal, add concentrate (per the “Refill Procedure” on page 16), to the desired
level. Again, follow the “Shell Water Refill Procedure” on page 13.
c. Close Valve No.’s 3, 8, 9, and 11. Drain concentrate from the level gauge using drain cock on
Valve No. 9.
12.2 ARC CONCENTRATE LEVEL CHECK (Refer to ARC Schematic on Page 6)
Step 1: Close Valve No.’s 1 and 2 to isolate tank.
Step 2: Attach a hose to Valve No. 6 and terminate to drain. Be aware that the tank may be under pressure.
Step 3: Open Valve No. 6 carefully to relieve pressure. Once pressure is relieved, fully open Valve No. 6,
draining water from the shell, then slowly vent Valve No.’s 4 and 5.
Step 4: When water has completely stopped draining, open Valve No.’s 9 and 3. Observe the sight gauge
level (because of the thick viscosity of ARC, allow time for level to rise).
a. If the level is normal, follow the “Shell Water Refill Procedure” on page 13.
14
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