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TM5-4210-229-14&P
2-24. AFFF VESSEL RECHARGE PROCEDURES (Continued).
f. When no discharge emits from either the purge valve (16, figure 2-1) or AFFF handline nozzle, slowly loosen
AFFF tank fill cap (15).
g. CLOSE the AFFF emergency shut-off valve (9, figure 2-1).
h. Close the AFFF handline valve.
i. Using the following table, determine the amount of AFFF concentrate that must be added.
Table 2-12. AFFF Vessel Fill Readings
DIPSTICK READING
1
2
3
4
5
6
7
8
AMOUNT OF 6% AFFF CONCENTRATE
15.15
14.65
13.9
13.0
12.1
11.2
10.3
9.4
TO BE ADDED *
DIPSTICK READING
9
10
11
12
13
14
15
16
AMOUNT OF 6% AFFF CONCENTRATE
8.5
7.6
6.7
5.8
4.9
4.0
3.1
2.2
TO BE ADDED
DIPSTICK READING
17
18
19
20
AMOUNT OF 6% AFFF CONCENTRATE
1.35
0.6
0.2
0
TO BE ADDED
*Quantity to be added can be rounded off to the next higher gallon.
j. Add the AFFF agent slowly.
k. Top up the vessel with water SLOWLY with the fill nozzle submerged to minimize foaming.
l. When the vessel is full, replace AFFF tank fill cap (15, figure 2-1) and tighten firmly.
m. OPEN the AFFF emergency shut-off valve (9, figure 2-1).
n. CLOSE purge valve (16, figure 2-1) and bleed valve (14).
o. OPEN all nitrogen cylinder valves.
p. Check that all valves and gauges are in the STAND-BY mode of operation (paragraph 2-19).
2-25. DRY CHEMICAL VESSEL RECHARGE PROCEDURES.
a. CLOSE all nitrogen cylinder valves.
b. CLOSE test valves (7, figure 2-1).
c. Check that the master control valve (5, figure 2-1) is CLOSED.
d. OPEN purge valve (17, figure 2-1) and bleed valve (18) to bleed any trapped pressure out of the vessel.
e. OPEN dry chemical handline slowly and leave OPEN.
2-74
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