Tank Container Density Calculator
Calculate optimal tank container loading based on product density (SG), temperature corrections, ullage requirements, and hazardous material classification for safe ISO tank shipments.
20' ISO Tank Container
Standard 20ft ISO tank for liquid chemicals and food products
20' High Pressure Tank
High pressure tank for LPG, ammonia, and compressed gases
30' ISO Tank Container
Larger capacity tank for bulk liquid transport
20' Reversible Coil Tank
Heated tank with reversible coils for viscous products
20' Gas Tank Container
Cryogenic/gas tank for LNG, ethylene, propylene
Cargo Weight
23040 kg
23.04 tonnes
Fill Volume
23040 L
23.04 m³
Maximum allowable cargo: 24.00 tonnes
Ullage Space
Required for thermal expansion
960 L
4.0%
Volume limited - consider larger capacity tank
Tank Types
20ft & 30ft ISO tanks with various pressure ratings
Density Range
SG 0.7 to 2.0 for various liquids and chemicals
Temperature
Density adjustment for temperature variations
IMDG Hazmat
Hazard classification and compatibility check
Tank Container Types & Specifications
| Type | Capacity | Max Payload | Pressure | Typical Use |
|---|---|---|---|---|
| 20' ISO Tank | 24,000 L | 26,000 kg | 3-4 bar | Chemicals, food products |
| 20' High Pressure | 21,000 L | 28,000 kg | 10-24 bar | LPG, ammonia, gases |
| 30' ISO Tank | 35,000 L | 30,000 kg | 3-4 bar | Bulk liquids, oils |
| 20' Heating Tank | 23,000 L | 25,500 kg | 3-4 bar | Viscous products, bitumen |
| 20' Gas Tank | 24,000 L | 24,000 kg | 17-24 bar | LNG, ethylene, propylene |
Specific Gravity (SG)
The ratio of a substance's density to water at a reference temperature. SG determines whether a product is weight-limited or volume-limited in a tank.
SG = Density of Product / Density of WaterUllage
The unfilled space in a tank container, typically 2-5% of capacity. Essential for thermal expansion and safety during transport.
Ullage % = (Empty Space / Total Capacity) × 100Check Max SG Rating
Every tank has a maximum SG rating. Exceeding this risks structural failure.
Temperature Correction
Density changes with temperature. Apply corrections for accurate weight calculations.
Calculate Ullage Properly
For heated products, allow additional ullage for thermal expansion during transit.
Know Your Limitation
High SG products are weight-limited, low SG products are volume-limited.
Verify Hazmat Compatibility
Check IMDG classification and ensure tank is certified for your product class.
Pre-Load Inspection
Verify tank cleanliness, previous cargo, and proper certification before loading.
- Ignoring temperature effects on density - can lead to significant weight errors
- Overfilling beyond 98% - insufficient ullage for thermal expansion
- Loading products with SG exceeding tank rating - structural damage risk
- Mixing incompatible hazardous materials - dangerous reactions possible
- Not accounting for heated product expansion during transit
- Using incorrect reference temperature for SG measurement