Oval Tank Volume Calculator
Calculation Results
Calculated estimations for your inputs:
Total Tank Capacity
0.00 US gal
0.00 L
Fill Liquid Volume
0.00 US gal
0.00 L
Total Liquid Weight
0 lbs
Weight when fully filled
Current Filled Weight
0 lbs
Weight of current filled portion
UK Total Capacity: 0.00 UK gal
UK Fill Volume: 0.00 UK gal
Fill Volume (m³): 0.0000 m³
⚠️ Structural Load & Environmental Warning: Large filled storage tanks contain immense weight (e.g. 500 gallons of water weighs over 4,100 lbs). Ensure that your tank stand, foundation slabs, structural flooring, and supports are professionally rated for the total filled load capacity. Additionally, check local codes regarding secondary containment dikes for fuel oil, petroleum products, or septic waste storage.
📋 Bill of Materials (BOM)
Estimated material quantities for the tank installation:
| Select | Material Item | Quantity | Notes & Specs |
|---|
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For an oval obround heating oil tank measuring 27 inches wide, 44 inches high, and 60 inches long, the total capacity is 267.94 US gallons, and at a 22 inch partial fill depth, the liquid volume is 133.97 US gallons.
About Oval Tank Volume Calculator
Oval tanks (commonly obround or stadium-shaped in cross-section) are the industry standard for residential heating oil storage. This design merges the space-saving benefits of rectangular tanks with the structural stability of cylindrical shapes.
The calculator models a vertical obround tank where the flat sides are vertical and capped by circular semicircles at the top and bottom. The total area is: A = (H - w) × w + π × (w/2)², where H is total height and w is width.
Calculating partial volumes requires splitting the liquid depth h into three distinct zones: the bottom semicircle cap, the straight rectangular middle section, and the top semicircle cap. Truncated circular segment trigonometry is applied to resolve partial volumes accurately.
Because heating oil is a potential soil contaminant, steel oval oil tanks must comply with UL 80 manufacturing specifications. Standard steel tanks are welded with a double-bottom configuration or placed in containment basins to catch slow corrosion leaks. The vertical oval profile allows the tank to fit through narrow basement doorways.
Traditional steel residential heating oil tanks are manufactured in standard 275-gallon and 330-gallon capacities, both sharing the vertical obround cross-section. Sizing the physical storage system requires checking basement stairwell widths and ceiling height clearances to ensure the physical tank can be positioned correctly on its leg supports.
The calculator models a vertical obround tank where the flat sides are vertical and capped by circular semicircles at the top and bottom. The total area is: A = (H - w) × w + π × (w/2)², where H is total height and w is width.
Calculating partial volumes requires splitting the liquid depth h into three distinct zones: the bottom semicircle cap, the straight rectangular middle section, and the top semicircle cap. Truncated circular segment trigonometry is applied to resolve partial volumes accurately.
Because heating oil is a potential soil contaminant, steel oval oil tanks must comply with UL 80 manufacturing specifications. Standard steel tanks are welded with a double-bottom configuration or placed in containment basins to catch slow corrosion leaks. The vertical oval profile allows the tank to fit through narrow basement doorways.
Traditional steel residential heating oil tanks are manufactured in standard 275-gallon and 330-gallon capacities, both sharing the vertical obround cross-section. Sizing the physical storage system requires checking basement stairwell widths and ceiling height clearances to ensure the physical tank can be positioned correctly on its leg supports.
Worked Calculations Examples
Oval Obround Tank Volume Calculation:
• Width w = 27 inches, Height H = 44 inches, Length L = 60 inches, Fill Depth h = 22 inches
• Top/Bottom Cap Radius r = w / 2 = 13.5 inches
• Cross-Sectional Area A = (H - w) × w + π × r² = (44 - 27) × 27 + π × 13.5² = 459 + 572.56 = 1,031.56 square inches
• Total Volume = A × L = 1,031.56 × 60 = 61,893.6 cubic inches
• Total US Gallons = 61,893.6 / 231 = 267.94 US Gallons
• Fill height h = 22 inches (Exactly half height).
• Since fill is half of H, the filled area is exactly 50% of A = 515.78 square inches.
• Fill Volume = 515.78 × 60 = 30,946.8 cubic inches = 133.97 US Gallons
• Width w = 27 inches, Height H = 44 inches, Length L = 60 inches, Fill Depth h = 22 inches
• Top/Bottom Cap Radius r = w / 2 = 13.5 inches
• Cross-Sectional Area A = (H - w) × w + π × r² = (44 - 27) × 27 + π × 13.5² = 459 + 572.56 = 1,031.56 square inches
• Total Volume = A × L = 1,031.56 × 60 = 61,893.6 cubic inches
• Total US Gallons = 61,893.6 / 231 = 267.94 US Gallons
• Fill height h = 22 inches (Exactly half height).
• Since fill is half of H, the filled area is exactly 50% of A = 515.78 square inches.
• Fill Volume = 515.78 × 60 = 30,946.8 cubic inches = 133.97 US Gallons
Key Design Facts & Specifications
| Parameter | Specification Standards |
|---|---|
| Geometric Shape Profile | Obround / Stadium Cross-Section |
| Primary Standard Code | UL 80 Steel Tanks for Oil-Burner Fuel |
| Heating Oil Density | 6.94 lbs/gal (0.832 kg/L) |
Oval Heating Tank Selection & Clearances
Oval obround tanks are optimized for narrow spaces, requiring careful selection:
- Basement Clearance: The vertical obround shape fits easily through standard 30-inch cellar doorways, making retrofits straightforward.
- Leg flange piping: Threaded legs must be screwed into bottom flanges and seated on solid concrete floor sections, never directly on soil.
- Corrosion prevention anodes: Modern steel oval storage tanks utilize interior zinc sacrificial anodes or fiberglass shells to prevent moisture-induced corrosion.
Heating Oil Safety Codes & Clearances
Clearance and venting guidelines protect properties from toxic heating fumes:
- NFPA 31 clearance: Residential heating oil tanks must be placed at least 5 feet from burners, furnaces, or electrical control panels.
- Vent pipe requirements: Fuel tanks require a dedicated vent pipe extending outside the home with an audible vent alarm (whistle) to prevent overfilling.
- Seismic bracing flanges: Leg bases must be anchored to concrete slabs using heavy-duty steel anchor bolts in zones subject to earthquake vibrations.
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