TM-5-4210-249-13-P-1

TACTICAL FIRE FIGHTING TRUCK (TFF) MODEL M1142

TECHNICAL MANUAL; OPERATOR’S AND FIELD LEVEL MAINTENANCE MANUAL WITH REPAIR PARTS AND SPECIAL TOOLS LIST (INCLUDING DEPOT REPAIR PARTS AND SPECIAL TOOLS); PART 1 OF 4

TM-5-4210-249-13-P-1 - Page 189 of 1188

TM 5-4210-249-13&P-1

0030-1/(2 blank)

DRAFT

0030

OPERATOR MAINTENANCE

FOAM SYSTEM GENERAL INFORMATION

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CAUTION

•

Do not mix different types or brands of foam agent in foam tanks 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 Class B foam agents may result in a chemical reaction which

can create globules, which can clog orifices and cause system failure.

•

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

This

will cause foam agent to enter water tank.

If re-circulation is needed to keep pump

cool, open PUMP COOLER valve.

1.

Foam system operation from cab (turret operation) requires system pressure of at least 200 to 210 psi (1,379

to 1,448 kPa) for proper proportion.

2.

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

TFFT00328P