Figure 11. Double Pass NBC Filtration Set-Up Using Three TWPS Units.

ARMY TM 10-4610-309-14

MARINE CORPS TM10802A-14/1

0027 00

TACTICAL WATER PURIFICATION SYSTEM (TWPS)

OPERATOR INSTRUCTIONS

OPERATION UNDER UNUSUAL CONDITIONS

NBC TANK

NBC HYPOCHLORITE TUBE

PRODUCT HOSE P02

TWPS UNIT

3 TWPS UNIT RAW WATER PUMP

DISTRIBUTION SYSTEM

WITH DISTRIBUTION PUMP INLET

HOSE P04

COUPLING FROM 1 OR 2 UNIT

DISTRIBUTION PUMP

PRODUCT HOSE P02

SHARED 6K

DISTRIBUTION TANKS

TWPS UNIT

Figure 11. Double Pass NBC Filtration Set-Up Using Three TWPS Units.

5. Operate the first two TWPS units for the first filtration pass as follows:

a. Unless treating water contaminated with cyanide, set the Speed dial on the hypochlorite

pump to OFF (fully counterclockwise).

b. If treating water contaminated with cyanide, set up the hypochlorite chemical system after

water production is established (with the product hose disconnected from the A-15

adaptor) as follows:

1) Hypochlorite is not used. In its place, AC-350 caustic is used to increase the pH

of the product water to a value of 10.5 to 11. This improves the rejection of the

cyanide when the product water is treated in the second pass operation.

2) Record the product water TDS and flow rate after start up.

3) Calculate the amount of AC-350 caustic required in milliliters to be added when

filling the chemical bucket:

Factor A = Product TDS (in mg/L) x 0.141 + 9.8

Amount = 2.97 x Factor A x Product Flow (gpm)

4) Use the Bisulfite chemical bucket (blue cover) in place of the hypochlorite bucket.

Fill the bucket with product water from the utility hose to the 4.5-gallon mark.

5) Prime Chemical Pump CP-3 following the procedure for normal operation (WP

6) Set the Speed to 70 and the stroke to 60.

0027 00-15