Annual
water infiltration in pounds Per 100 ft. of pipe.
Calculations
based on a vapor barrier perm rating of .02
with
a 12 inch insulation outside diameter.
(pdf
version available below)
| Sys.
Temp. |
Ambient Temperature and 25% Relative
Humidity
|
|
| 30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
| 45 |
0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
1.44 |
1.44 |
| 20 |
0.00 |
0.00 |
0.00 |
0.22 |
0.65 |
1.22 |
1.99 |
3.00 |
| 0 |
0.03 |
0.19 |
0.42 |
0.73 |
1.16 |
1.74 |
2.50 |
3.51 |
| -20 |
0.22 |
0.39 |
0.61 |
0.93 |
1.36 |
1.93 |
2.70 |
3.71 |
| -40 |
0.29 |
0.46 |
0.68 |
1.00 |
1.43 |
2.00 |
2.77 |
3.78 |
| Sys. Temp |
Ambient Temperature and 50% Relative
Humidity
|
|
| 30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
| 45 |
0.00 |
0.00 |
0.00 |
0.00 |
0.55 |
1.70 |
3.23 |
5.25 |
| 20 |
0.00 |
0.17 |
0.62 |
1.24 |
2.10 |
3.26 |
4.79 |
6.80 |
| 0 |
0.35 |
0.68 |
1.13 |
1.76 |
2.61 |
3.77 |
5.30 |
7.32 |
| -20 |
0.55 |
0.88 |
1.33 |
1.95 |
2.81 |
3.96 |
5.50 |
7.51 |
| -40 |
0.62 |
0.95 |
1.40 |
2.02 |
2.88 |
4.03 |
5.57 |
7.58 |
| Sys. Temp |
Ambient Temperature and 75% Relative
Humidity
|
|
| 30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
| 45 |
0.00 |
0.00 |
0.00 |
0.72 |
2.00 |
3.73 |
6.03 |
9.05 |
| 20 |
0.16 |
.065 |
1.33 |
2.27 |
3.56 |
5.29 |
7.59 |
10.61 |
| 0 |
0.67 |
1.17 |
1.84 |
2.78 |
4.07 |
5.80 |
8.10 |
11.12 |
| -20 |
.87 |
1.36 |
2.04 |
2.98 |
4.27 |
6.00 |
8.30 |
11.32 |
| -40 |
0.94 |
1.43 |
2.11 |
3.05 |
4.33 |
6.07 |
8.37 |
11.39 |
*NOTE:
These calculation are linear. A 6" OD will have half the water
infiltration listed above. All temperatures are in measured degree
Fahrenheit.
(right
click on this logo to download a copy of this article in pdf format)
|
