| Tank Specifications | |||||||||
| Outer diameter, in | 48.00 | 48.00 | 48.00 | 48.00 | 54.00 | 54.00 | 54.00 | 60.00 | Notes: |
| Inner Diameter, in | 42.00 | 42.00 | 42.00 | 42.00 | 48.00 | 48.00 | 48.00 | 54.00 | |
| Tank insulation layer thickness | 2.125 | 2.125 | 2.125 | 2.125 | 2.125 | 2.125 | 2.125 | 2.125 | incl bending curve |
| Fiberglass insulation thickness | 0.125 | 0.125 | 0.125 | 0.125 | 0.125 | 0.125 | 0.125 | 0.125 | |
| Inner Diameter after insulation, fiberglass, in | 37.50 | 37.50 | 37.50 | 37.50 | 43.50 | 43.50 | 43.50 | 49.50 | |
| Total tank height, in | 70.50 | 72.00 | 76.50 | 82.00 | 72.00 | 76.50 | 82.00 | 68.00 | to top of 2x4 brace |
| Tank top thickness (above tank rim only) | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | incl 2x4 and 3/4” plywood |
| Raw height, tube | 68.25 | 69.75 | 74.25 | 79.75 | 69.75 | 74.25 | 79.75 | 65.75 | 20’=240”. 240”/3=80” |
| Tank top insulation/fiberglass layer thickness (below tank rim) | 2.125 | 2.125 | 2.125 | 2.125 | 2.125 | 2.125 | 2.125 | 2.125 | incl fiberglass |
| air gap | 6.00 | 6.00 | 6.00 | 6.00 | 6.00 | 6.00 | 6.00 | 6.00 | |
| Water Column Ht | 60.125 | 61.625 | 66.125 | 71.625 | 61.625 | 66.125 | 71.625 | 57.625 | |
| Tank interior space ht | 66.125 | 67.625 | 72.125 | 77.625 | 67.625 | 72.125 | 77.625 | 63.625 | |
| Tank interior surface area, ft2 | 79.8 | 81.2 | 85.3 | 90.4 | 95.9 | 100.7 | 106.4 | 106.8 | |
| Water volume, cu in. | 66,406 | 68,063 | 73,033 | 79,108 | 91,585 | 98,273 | 106,447 | 110,895 | |
| Water volume, gall. | 288 | 295 | 317 | 343 | 398 | 427 | 462 | 481 | |
| Water weight, lbs | 2,404 | 2,464 | 2,644 | 2,864 | 3,315 | 3,557 | 3,853 | 4,014 | |
| Target Delta T | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | |
| BTU capacity | 60,094 | 61,593 | 66,091 | 71,588 | 82,880 | 88,932 | 96,329 | 100,354 | |
| Tank wt, empty, lbs (est.) | 250 | 250 | 250 | 250 | 250 | 300 | 300 | 300 | |
| Total floor load filled, lbs | 2,654 | 2,714 | 2,894 | 3,114 | 3,565 | 3,857 | 4,153 | 4,314 | |
| Floor load, lbs/ft2 | 6,524 | 6,687 | 7,173 | 7,767 | 6,881 | 7,386 | 7,998 | 6,583 | |
| Avg temp tank location, deg F | 65 | 65 | 65 | 65 | 65 | 66 | 66 | 66 | |
| Tank temp, top | 150 | 150 | 150 | 150 | 150 | 151 | 151 | 151 | Avg. estimated, end of day |
| Tank temp, bottom | 110 | 110 | 110 | 110 | 110 | 111 | 111 | 111 | Avg. estimated, end of day |
| Avg tank temp | 130 | 130 | 130 | 130 | 130 | 131 | 131 | 131 | Avg. estimated, end of day |
| R value/in | 6.50 | 6.50 | 6.50 | 6.50 | 6.50 | 6.50 | 6.50 | 6.50 | |
| Tank minimal insulation value | 13.8 | 13.8 | 13.8 | 13.8 | 13.8 | 13.8 | 13.8 | 13.8 | Insulation only; not accounting for outer tank materials |
| Total Tank Heat loss, BTU/hr | 376 | 382 | 402 | 425 | 452 | 474 | 501 | 502 | |
| Temp loss, Deg F/hr | 0.16 | 0.16 | 0.15 | 0.15 | 0.14 | 0.13 | 0.13 | 0.13 | |
| Temp loss, Deg F/8hr | 1.25 | 1.24 | 1.22 | 1.19 | 1.09 | 1.07 | 1.04 | 1.00 | Insulation losses only, other losses as per note 1. |
| Notes | |||||||||
| 1. The main heat loss path is from heat migration by convection from tank lid (atmospheric leaks), and pipe losses. These convection losses are greater than the losses from the tank insulation. | |||||||||
| The purpose of these calculations is to show the effectiveness of tank insulation only. | |||||||||