LESSON 5
DESCRIBE THE PROCEDURES FOR LOADING, METERING, AND DISPERSING
SUBSTANCES USING THE M12A1 PDDA
TASK
Describe the procedures for loading, metering, and dispersing substances using the M12A1 PDDA.
CONDITIONS
Given information about and illustrations of the procedures for loading decontaminants, soap, and foam
into the M12A1 PDDA; metering detergent and foam with water, mixing and spraying decontaminants;
and assembling, disassembling, and operating the shower assembly of the M12A1 PDDA.
STANDARDS
Demonstrate competency of the task skills and knowledge by responding to the multiple-choice
examination covering the procedures for loading substances into the M12A1 PDDA; metering detergent
and foam with water, mixing and spraying decontaminants; and assembling, disassembling, and
operating the shower assembly of the M12A1 PDDA.
REFERENCE
TM 3-4230-209-40
Learning Event 1
METER DETERGENT USING THE M12A1 PDDA
In washing vehicles or equipment to remove contaminants, the addition of a small amount of detergent
to the wash water greatly enhances the cleansing ability of the water. The M12A1 PDDA operator can
use the apparatus to add the required quantity of detergent to water when performing decontamination
operations.
PREPARE TO METER DETERGENT WITH WATER
When detergent is metered with water, the tank is usually already filled with water and the water has
already been heated (the water should be heated to approximately 90 degrees Fahrenheit). You learned
to perform these operations in previous learning events.
When preparing to meter detergent with water, connect the suction hose between the tank unit and pump
unit connector panel. Be sure that the tank drain valve is open and that the upper and lower discharge
connectors on the pump unit are capped. Close valve 4 on the control panel if it is not already closed.
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