Flexitank Loading Estimate Tool
Flexitank Capacity Calculator
Estimate cargo weight, required volume, fill percentage, payload status, and possible underfill or overfill warnings for standard 20-foot flexitank shipments.
Important Notice
This calculator is provided for general estimation only. Final loading decisions must be verified against the latest flexitank manufacturer’s instructions, Safety Data Sheet (SDS), Technical Data Sheet (TDS), container payload limit, shipping line requirements, road regulations, port rules, and applicable transport standards.
Calculator Inputs
Formula Used
Cargo Weight
Weight = Volume × Density
Required Volume
Volume = Weight ÷ Density
Fill Percentage
Fill % = Loaded Volume ÷ Capacity × 100
Filling Range Guide
Flexitanks should normally be filled close to the manufacturer’s specified nominal capacity. Underfilling may increase liquid movement during transport, commonly known as sloshing or wave action. Overfilling may increase stress on the flexitank and container structure.
| Fill Level | Example for 24,000 L Flexitank | Calculator Status |
|---|---|---|
| Below 97% | Below 23,280 L | Underfill warning |
| 97% to 103% | 23,280 L to 24,720 L | Common operating range |
| Above 103% | Above 24,720 L | Overfill warning |
Material Safety Data Sheet / Safety Data Sheet Relevance
A Material Safety Data Sheet, now more commonly known as a Safety Data Sheet (SDS), is a document supplied by the product manufacturer, supplier, exporter, importer, or chemical owner. It provides information about the product’s physical properties, hazards, handling requirements, storage conditions, emergency measures, and transport considerations.
For flexitank capacity calculation, the most relevant SDS information is usually found in Section 9: Physical and Chemical Properties. This section may include density, specific gravity, viscosity, flash point, freezing point, boiling point, vapour pressure, and other technical values.
SDS Information Useful for Calculation
- Density / specific gravity
- Temperature at which density is measured
- Viscosity
- Freezing point or melting point
- Boiling point
- Vapour pressure
SDS Information Useful for Suitability
- Hazard classification
- Flash point and flammability
- Chemical stability and reactivity
- Compatibility with packaging materials
- Handling and storage requirements
- Transport information
The SDS should not be treated as the only source for flexitank loading decisions. A Technical Data Sheet (TDS), product specification, laboratory certificate, and flexitank manufacturer’s approved loading instructions may provide more precise operational values.
Why Density and Temperature Matter
Density is not always fixed. Some liquids, such as palm oil, palm olein, glycerine, latex, molasses, lubricants, and chemicals, may have different density values at different temperatures. When temperature increases, liquid density may decrease. This can affect the calculated cargo weight.
For example, if a cargo has a density of 0.91 kg/L at room temperature but 0.89 kg/L at loading temperature, the weight difference for 24,000 L may be several hundred kilograms. Users should therefore enter the density value that best matches the actual loading condition.
Disclaimer
This flexitank capacity calculator is provided for general estimation, educational, and business reference purposes only. The results are based on user-entered values including product density, loaded volume, nominal flexitank capacity, filling range, and maximum payload limit.
Actual loading limits may vary depending on the flexitank manufacturer’s specification, cargo temperature, product density, Safety Data Sheet (SDS), Technical Data Sheet (TDS), container CSC plate, container condition, shipping line acceptance rules, port regulations, road regulations, railway restrictions, destination-country requirements, and applicable laws.
The 97% to 103% filling range is used as a general warning guide only. Standards, regulations, manufacturer requirements, and industry practices may change without this website being immediately updated. Users must double-check all calculations and obtain confirmation from the cargo owner, flexitank supplier, shipping line, freight forwarder, and relevant transport professionals before shipment. LAF Flexitank Services Sdn Bhd does not accept responsibility for loading decisions made solely based on this calculator.