Bitumen Tank Volume Calculator

• 1Enter the tank diameter in metres. Use the inside diameter (excluding cladding).
• 2Enter the tank length in metres, measured along the straight cylinder.
• 3Enter the storage temperature (°C) and bitumen density in kg/m³ (default 1,030 @ 15°C). Read the temperature section below before accepting it.
• 4Choose full tank, percentage fill, or enter liquid dip depth directly.
• 5Click Calculate Volume. Read the result in m³, litres and tonnes.

Full tanks, flat ends. Hot weight uses 944 kg/m³ (160°C).

Volume in a horizontal tank does not rise in step with depth. Find your depth as a share of diameter, then read the volume share. Interpolate between rows.

Half depth is exactly half volume. Near the middle of the tank, a small change in level moves a lot of bitumen, so a 20 mm error in a dip reading matters more there than at either end. Build-up on the tank walls changes the true diameter too, and industry fact sheets warn that horizontal tanks suffer more from this than vertical ones.

Bitumen expands when heated, so each cubic metre holds less mass at 160°C than at 15°C. ASTM D4311 Standard Practice sets the base temperature for asphalt volume at 15°C and uses an expansion coefficient of 0.00063 per °C for asphalts denser than 966 kg/m³ at that temperature. Lighter grades use 0.00072.

Bitumen is commonly stored around 150°C to 160°C, so a tank at working temperature holds about 9% less weight per cubic metre than the 1,030 default implies. Get the density at 15°C from your supplier’s data sheet, then adjust it for your tank temperature.

Expansion also affects fill levels. A tank filled to 20 m³ at 15°C reaches about 21.8 m³ at 160°C, a rise of 9.1%. Leave headroom for it.

Tanks With Dished Ends

Many bitumen tanks have curved heads. The calculator assumes flat ends by default, so add head volume to the shell volume:

• 2:1 elliptical head: π × D³ ÷ 24 per head
• Hemispherical head: π × D³ ÷ 12 per head

For a 2 m diameter, two elliptical heads add 2.09 m³, which is 11% of the 18.85 m³ shell in Example 1. Two hemispherical heads add 4.19 m³, or 22%. Torispherical heads follow other formulas. Use the tank maker’s calibration chart for those.

Total Capacity vs Usable Capacity

The calculator returns geometric capacity. Usable capacity is smaller.

Heating coils must stay under the bitumen. Eurobitume Storage & Handling Guidance tells operators to consider coil position against bitumen level, because exposed coils overheat the product. The draw-off point sits above the tank bottom, so some bitumen stays unavailable. Industry fact sheets built on Refined Bitumen Association (RBA) Guidance subtract that unavailable volume, then take another 10% off to reach a safe working capacity. Your site procedure or tank maker sets the real limits.

How to Measure Your Tank

Measure the inside diameter of the steel shell. Insulation and cladding add to the outside. A tank that measures 2.2 m over the cladding but has a 2.0 m shell would be overstated by 21%, because volume grows with the square of diameter.

Measure length along the cylinder, not including the heads. If the tank has a calibration plate or dip chart, trust it over a tape measure.

Typical Tank Sizes

Spray distributor trucks commonly carry 1,000 to 4,500 US gallons, which is about 3.8 to 17 m³. Some larger trucks carry 14,000 to 16,000 litres. Plant storage tanks run from tens of cubic metres up to a few hundred. Terminal tanks reach thousands of cubic metres. One recent import terminal built a 7,250 m³ tank.

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  Using outside diameter. Insulation inflates the capacity.

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  Using the 15°C density for a hot tank. It overstates weight by about 9% at 160°C.

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  Entering dip depth as volume %. A 25% depth is 19.6% volume. A 75% depth is 80.4%.

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  Ignoring dished heads. They add 11% to 22% to a 2:1 tank.

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  Entering millimetres in a metre field. A diameter of 2,000 instead of 2 makes volume 1,000,000 times too high.

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  Reading tonnes as US tons. The gap is 10%.

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  Filling to the brim cold. Bitumen expands as it heats.

For binder weight inside a mix, use the bitumen calculator. For sprayed binder under each layer, use the tack coat calculator. For mix weight, use the asphalt tonnage calculator.