ARMY TM 10-4610-309-14
MARINE CORPS TM10802A-14/1
0083 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
SUPPORTING INFORMATION
REVERSE OSMOSIS % CLEAN CALCULATION
Step 6
Calculate:
C = TCF x NDP
C is the net driving pressure that would be required at 77 degrees F.
Step 7
Calculate:
P(TWPS) = Product Flow Rate / C
P(TWPS) is the actual TWPS RO membrane permeability (GPM per PSI)
Step 8
Calculate:
P = 0.1628 AB/10,000
P is the expected new RO element membrane permeability (GPM/PSI)
Step 9
Calculate:
%Clean = 100 x P(TWPS)/P
Step 10
Enter the calculated value for %Clean in the Comments section of the Operating Data Log (WP 0080) in
line with the data used. Compare this value with earlier values calculated while deployed on the current
mission. A decreasing value is an indication of membrane fouling. If the decrease exceeds 10% (for
example: a decrease from 95% to 85%), cleaning should be scheduled. Refer to WP0016.
0083 00-5
