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 3
With the Feed Temperature, use Table 3 to determine Factor TCF. TCF is the Temperature Correction
Factor that converts the actual performance to what it would be at 77 degrees F.
Table 3. Factor TCF.
Feed
TCF
Feed
TCF
Feed
TCF
Feed
TCF
Temp
Temp
Temp
Temp
32
0.50
52
0.68
72
0.93
92
1.26
33
0.51
53
0.69
73
0.94
93
1.28
34
0.52
54
0.70
74
0.96
94
1.30
35
0.53
55
0.71
75
0.97
95
1.32
36
0.53
56
0.72
76
0.98
96
1.34
37
0.54
57
0.74
77
1.00
97
1.36
38
0.55
58
0.75
78
1.02
98
1.38
39
0.56
59
0.76
79
1.03
99
1.40
40
0.57
60
0.77
80
1.05
100
1.42
41
0.58
61
0.78
81
1.06
101
1.45
42
0.58
62
0.79
82
1.08
102
1.47
43
0.59
63
0.81
83
1.10
103
1.49
44
0.60
64
0.82
84
1.11
104
1.51
45
0.61
65
0.83
85
1.13
105
1.54
46
0.62
66
0.84
86
1.15
106
1.56
47
0.63
67
0.86
87
1.17
107
1.58
48
0.64
68
0.87
88
1.18
108
1.61
49
0.65
69
0.88
89
1.20
109
1.63
50
0.66
70
0.90
90
1.22
110
1.66
51
0.67
71
0.91
91
1.24
Step 4
Calculate:
Factor AB = (Factor A) x (Factor B).
Factors A and B are determined from steps 1 and 2 above. Factor AB is the average osmotic pressure of
the feed water as it is concentrated within the RO elements.
Step 5
Calculate:
NDP = RO Feed Pressure 45 AB
NDP is the net driving pressure. This is the average pressure driving the product water through the RO
elements.
0083 00-4
