Owner's Manual

46
CORRECTION FACTOR FOR COMPRESSION TANK SELECTION
To use this table: (1) Enter left hand column at initial pressure, (2) Move to the right to column headed with the allowable system pressure increase, (3) Read correction factor. (4) Multiply correction factor by the uncorrected tank size found from Figure 3-9 to obtain the corrected compression tank size.
FIGURE 3-10
NET EXPANSION FACTORS FOR WATER
To use this table: (1) For the system water temperature, read the expansion factor directly. (2) Multiply the expansion factor by the system volume to nd the acceptance volume of the diaphragm type tank. (3) Proceed to Figure 3-12.
FIGURE 3-11
Initial Pressure On
Compression Tank
Allowable System Pressure Increase*
6 psi 8 psi 10 psi 12 psi 14 psi 16 psi 20 psi 25 psi 30 psi 40 psi 50 psi 75 psi
4 psi 1.0 .8 .68 .62 .59 .55 .5 .49 .48 .48 .48 .48 8 psi 1.6 1.2 1.05 .92 .85 .8 .7 .65 .6 .5 .5 .5
12 psi 2.0 1.7 1.43 1.25 1.15 1.07 .95 .8 .75 .63 .55 .54 18 psi 3.0 2.55 2.2 1.94 1.75 1.6 1.35 1.15 .98 .8 .72 .7 24 psi 4.6 3.65 3.1 2.65 2.38 2.15 1.78 1.52 1.35 1.12 1.02 1.0 30 psi --- 5.0 4.2 3.6 3.1 2.7 2.3 1.9 1.8 1.43 1.25 1.1 38 psi --- --- 5.3 4.6 4.1 3.7 3.05 2.5 2.25 1.95 1.7 1.4
50 psi --- --- --- --- --- --- 4.7 3.9 3.1 2.6 2.3 2.0
60 psi --- --- --- --- --- --- --- 4.5 3.8 3.1 2.7 2.4
70 psi --- --- --- --- --- --- --- --- 5.2 3.9 3.5 3.1
* Relief Valve setting minus initial pressure on Relief Valve, pump on.
Net Expansion Factors for Water, Based on 40°F
100° - .0060 130° - .0112 160° - .0190 190° - .0313 220° - .0436
110° - .0075 140° - .0133 170° - .0231 200° - .0354 230° - .0477
120° - .0093 150° - .0157 180° - .0272 210° - .0395 240° - .0518