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 183 of 1318

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

0021-1/(2 blank)

DRAFT

0021

Change 1

OPERATOR MAINTENANCE

FOAM SYSTEM GENERAL INFORMATION

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CAUTION

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Do not mix different types or manufacturers’ brands of foam agent in foam tank or

piping.

Mixing of different foam agents (either type or manufacturer) may cause

deterioration of foam agent, improper proportioning, and poor performance in a fire

situation.

Mixing of Class A and different types of foam agents may result in a

chemical reaction which can create globules, which can clog orifices and cause

system failure.

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When in foam mode, never open TANK FILL & RE-CIRCULATING LINE valve control.

This will cause foam agent to enter water tank.

If recirculation is needed to keep

pump cool, open PUMP COOLER valve.

NOTE

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Foam system operation from cab (Bumper Turret Operation)

requires system pressure of

at least 185 to 195 psi (1,276 to 1,345 kPa) for proper proportion.

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Foam system operation from pump operator’s panel requires system pressure of at least

125 to 250 psi (862 to 1,724 kPa) for proper proportion.

END OF WORK PACKAGE

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HWT3123