Manchester 500 Gallon Propane Tank (68303.20)
Manchester Tank & Equipment builds ASME propane vessels for domestic use. Its sheet gives the outside diameter, overall length and head type for each size; the tanks are rated by water capacity, and propane is filled to no more than about 80 % of it.
| Model | Aboveground Propane Tank 500 gal (ASME, horizontal domestic) |
| Part / model number | 68303.20 |
| Rated capacity | 500 gal / 1892.7 l (water capacity) |
| Outside Diameter | 41" |
| Overall Length | 8' 8 1/2" |
| Overall Height | 3' 6 15/16" |
| Leg Width | 16 1/4" |
| Leg Spacing | 3’ 8" |
| Empty weight | 972 lbs (440.9 kg) |
| Inside or outside? | outside (diameter explicitly 'Outside Diameter'); sheet states 'All Vessel Dimensions are Approximate' |
“68303.20* 500 1892.7 41" 1041.4 Hemi 8' 8 1/2" 2654.3 3' 6 15/16" 1308.7 16 1/4" 412.8 3’ 8" 1117.6 972 440.9 (columns: Part Number, Water Capacity Gal/l, Outside Diameter In/mm, Head Type, Overall Length, Overall Height, Leg Width, Leg Spacing In/mm, Weight Lbs/kg)” — Manchester Tank, retrieved 2026-11-01
Dimension drawing
Gallons by the inch
With hemispherical heads (“Hemi”), a 41.00 in outside diameter and 104.500 in overall length, the outside of the vessel encloses 519.1 gal; the 500 gal water capacity is 3.7 % less, the difference being steel wall thickness and the dimensions' rounding. The chart below uses the shape and scales it to the rated water capacity.
| Depth | Gallons | % of water capacity |
|---|---|---|
| 1″ | 2.5 | 1% |
| 2″ | 7.3 | 1% |
| 3″ | 13.8 | 3% |
| 4″ | 21.6 | 4% |
| 5″ | 30.5 | 6% |
| 6″ | 40.4 | 8% |
| 7″ | 51.3 | 10% |
| 8″ | 63 | 13% |
| 9″ | 75.4 | 15% |
| 10″ | 88.5 | 18% |
| 11″ | 102.1 | 20% |
| 12″ | 116.3 | 23% |
| 13″ | 131 | 26% |
| 14″ | 146.1 | 29% |
| 15″ | 161.5 | 32% |
| 16″ | 177.2 | 35% |
| 17″ | 193.1 | 39% |
| 18″ | 209.2 | 42% |
| 19″ | 225.5 | 45% |
| 20″ | 241.8 | 48% |
| 21″ | 258.2 | 52% |
| 22″ | 274.5 | 55% |
| 23″ | 290.8 | 58% |
| 24″ | 306.9 | 61% |
| 25″ | 322.8 | 65% |
| 26″ | 338.5 | 68% |
| 27″ | 353.9 | 71% |
| 28″ | 369 | 74% |
| 29″ | 383.7 | 77% |
| 30″ | 397.9 | 80% |
| 31″ | 411.5 | 82% |
| 32″ | 424.6 | 85% |
| 33″ | 437 | 87% |
| 34″ | 448.7 | 90% |
| 35″ | 459.6 | 92% |
| 36″ | 469.5 | 94% |
| 37″ | 478.4 | 96% |
| 38″ | 486.2 | 97% |
| 39″ | 492.7 | 99% |
| 40″ | 497.5 | 99% |
| 41″ | 500 | 100% |
Propane tanks are read with the float gauge, which shows percent of water capacity directly — this chart is for checking a gauge or for a tank used for something other than propane. Never put a stick in a pressurised tank.
Related: propane tank calculator · capsule tank calculator · all manufacturer tanks. Dimensions differ from your tank? Measure it and use the tank volume calculator.
Cite this page
Copy a reference for this page. The data on this page comes from the maker's own documents. Also cite the document in the sources list.
Sri Murugan Systems. (2026, November 1). Manchester 500 gallon propane tank (68303.20) chart. tankvolumecalc.com. https://tankvolumecalc.com/tanks/manchester/500-gallon-propane-tank-68303-20/
@misc{srimurugansystems2026manchester500gallonpropanetank6830320,
author = {{Sri Murugan Systems}},
title = {{Manchester 500 Gallon Propane Tank (68303.20) Chart}},
year = {2026},
month = nov,
howpublished = {\url{https://tankvolumecalc.com/tanks/manchester/500-gallon-propane-tank-68303-20/}},
url = {https://tankvolumecalc.com/tanks/manchester/500-gallon-propane-tank-68303-20/},
note = {tankvolumecalc.com, accessed 2026-11-01}
}Last updated 1 November 2026.
Sources and standards
- ABOVEGROUND PROPANE TANKS (Manchester Tank, 120-1000 GALLONS)Manchester Tank — manufacturerhttps://www.mantank.com/upl/downloads/content-blocks/aboveground-horizontal-domestic-propane-tanks.pdfRev. 4/11/2025
- ABOVEGROUND PROPANE TANK spec sheet (Mainline/Premium series)Manchester Tank — manufacturerhttps://www.mantank.com/upl/downloads/content-blocks/aboveground-tank-spec-sheet.pdfPDF created 2024-12-05 (metadata)
- Methodology — partial-fill formulas used for the geometric figurestankvolumecalc.comhttps://tankvolumecalc.com/methodology/
Every linked source above was retrieved and checked on 2026-11-01.