Brochure

Sizing Guide
Table 1: Water Expansion Factor
Maximum
System
Temp.
Minimum System Temperature
40° F 50° F 60° F 70° F 80° F 90° F 100° F
60° F .0005 .0049 — — — — —
70° F .0015 .0014 .0009 — — — —
80° F .0026 .0025 .0020 .0011 — — —
90° F .0041 .0040 .0035 .0026 .0015 — —
100° F .0058 .0057 .0052 .0043 .0031 .0017 —
110° F .0077 .0077 .0072 .0062 .0051 .0037 .0019
120° F .0100 .0099 .0095 .0086 .0074 .0060 .0043
130° F .0124 .0123 .0118 .0109 .0098 .0083 .0066
140° F .0150 .0149 .0145 .0135 .0124 .0110 .0093
150° F .0179 .0178 .0173 .0164 .0153 .0133 .0121
160° F .0209 .0208 .0204 .0194 .0181 .0165 .0148
170° F .0242 .0241 .0236 .0227 .0216 .0201 .0184
180° F .0276 .0275 .0271 .0261 .0250 .0236 .0219
190° F .0313 .0312 .0307 .0298 .0287 .0272 .0255
200° F .0351 .0350 .0346 .0336 .0325 .0311 .0294
210° F .0391 .0390 .0386 .0376 .0365 .0351 .0334
220° F .0434 .0433 .0428 .0419 .0408 .0393 .0376
230° F .0476 .0475 .0471 .0461 .0450 .0436 .0419
240° F .0522 .0521 .0517 .0507 .0496 .0482 .0465
Table 2: Tank Acceptance Factor
Maximum
Operating
Pressure
(psig)
Minimum Operating Pressure at Tank (psig)
5 10 12 15 20 30 40 50 60 70 80
27 0.527 0.408 0.360 0.288 0.168 — — — — — —
30 0.560 0.447 0.403 0.336 0.224 — — — — — —
35 0.604 0.503 0.463 0.403 0.302 0.101 — — — — —
40 0.640 0.548 0.512 0.457 0.366 0.183 — — — — —
45 0.670 0.586 0.553 0.503 0.419 0.251 0.084 — — — —
50 0.696 0.618 0.587 0.541 0.464 0.309 0.155 — — — —
55 0.717 0.646 0.617 0.574 0.502 0.359 0.215 0.072 — — —
60 0.736 0.669 0.643 0.602 0.536 0.402 0.268 0.134 — — —
65 0.753 0.690 0.665 0.627 0.565 0.439 0.314 0.188 0.062 — —
70 0.767 0.708 0.685 0.649 0.590 0.472 0.354 0.236 0.118 — —
75 0.780 0.725 0.702 0.669 0.613 0.502 0.390 0.279 0.167 0.056 —
80 0.792 0.739 0.718 0.686 0.634 0.528 0.422 0.317 0.211 0.106 —
90 0.812 0.764 0.745 0.716 0.669 0.573 0.478 0.382 0.287 0.191 0.096
100 0.828 0.785 0.767 0.741 0.698 0.610 0.523 0.436 0.347 0.261 0.174
110 0.842 0.802 0.786 0.762 0.723 0.642 0.561 0.481 0.401 0.321 0.240
For fluid applications other than water, consult AMTROL technical services.
Acceptance factors based on expansion tank charged to minimum operating pressure while empty of liquid.
Things You Must Know:
1. Total System Volume . . . . . . . . . . . . . . . . . . . . . . . . _____ gallons
2. Minimum System Temperature ................ _____ °F
3. Maximum System Temperature ................ _____ °F
4. Minimum Operating Pressure at Expansion Tank .. _____ psig
5. Maximum Operating Pressure at Expansion Tank . _____ psig
Selection of Expansion Tank:
6. Find and enter “Water Expansion Factor” ........ _____ (see Table 1)
7. Amount of Expanded Water = Line (1) x Line (6) .. _____ gallons
8. Find and enter “Tank Acceptance Factor” ........ _____ (see Table 2)
9. Minimum Volume = Line (7) ÷ Line (8) .......... _____ gallons
10. Select an Expansion Tank that is at least equal to Line (9) for Tank
Volume (gallons) and Line (7) for Max. Acceptance Volume (gallons).
Multiple tanks may be required.
Non-ASME & Residential Models
can be found in catalog MC2680.
© 2019 Worthington Industries Inc. MC2682 (06/19)
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