TM-9-2320-328-13-P-1

HEMTT-BASED WATER TENDER (HEWATT)

TECHNICAL MANUAL; OPERATOR’S AND FIELD LEVEL MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST); PART 1 OF 3

MARCH 2009

TM-9-2320-328-13-P-1 - Page 187 of 1318

TM 9-2320-328-13&P-1

0022-3

DRAFT

0022

Change 1

NOTE

•

Foam cell should be filled halfway up into expansion dome to minimize surface area of

foam agent subject to evaporation.

Pour foam agent down center of round tube when

filling tank.

This tube goes to bottom of tank and allows foam agent to enter under surface

of foam currently in tank.

This is done to reduce aeration of foam agent per NFPA.

•

Foam agent must be added by pouring through the 4 in. (10 cm) tube; it must be done

slowly and carefully to prevent aeration.

If aeration occurs inside tank, stop pouring until

foam agent bubbles dissolve.

Take care not to allow water, dirt, debris, or foreign

substance to enter tank.

6.

Close expansion dome hatch (3).

7.

Stow right rear access ladder (WP 0012).

END OF TASK

DRAINING/FLUSHING FOAM AGENT TANK

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NOTE

Foam drained from foam tanks will need to be drained into properly marked and sealed

containers.

1.

Gather suitable containers.

2.

Remove cap and attach drain hose (1) to FOAM SYSTEM DRAIN valve (2).

3.

Open expansion dome hatch (3).

4.

Put FOAM SYSTEM DRAIN valve handle (4) to open position and completely drain foam into containers.

5.

Put FOAM SYSTEM DRAIN valve handle (4) to closed position.

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HWT0495