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Flammable and combustible liquid classification
Determines a liquid's classification from its closed-cup flash point and boiling point, and shows the condition that decided it.
The classification determines the quantity allowed in a control area, the tank separation distances and the protection requirements. It is the starting point for almost every other calculation involving liquids.
Demonstration scenario
Technical acetone — flash point −17°C, boiling point 56°C
Liquid properties
- Flash point (closed cup)From the safety data sheet
- −17 °C
- Boiling pointRequired for the sub-classification
- 56 °C
- Source of the value
- Safety data sheet, section 9
- The flash point was measured in a closed cup. An open-cup measurement gives a higher value and is not suitable for classification.
- The 37.8°C boundary between a flammable liquid and a combustible liquid is verified and in our hands — Procedure 27 §3.11–3.12. What is missing is the IA/IB/IC/II/IIIA/IIIB sub-classification split and the boiling point condition, which the procedure refers to in footnotes 25 and 26 (NFPA 30 2024, table 9.6.1).
Result
- Classification
- Flammable liquid
- Sub-classification
- —
- Deciding condition
- Flash point below 37.8°C
Requires the full classification table
Interface demonstration — not a professional result. The values marked — will be calculated once this tool's data source has been loaded.
Data source
NFPA 30 (2024), chapter 4 — the classification table
The primary boundary is verified from the procedure. The sub-classification split requires the standard itself.
What is blocked, and what would release it
NFPA 30 (2024) — table 9.6.1, the sub-classification split
One specific part is missing, not the whole document. The principal boundary is held and verified: procedure 27 §3.11–3.12 defines a flammable liquid as one with a flash point below 37.8 °C and a combustible liquid as one above it, and appendix ג page 15 carries the class names and their quantities. What the procedure does not carry is the sub-classification split itself — what separates IA from IB from IC, where class II sits, and what separates IIIA from IIIB — together with the boiling point condition that divides the lowest band. The procedure points there explicitly: footnotes 25 and 26 on page 15 attribute the values to NFPA 30 (2024), tables 9.6.1 and 18.5.4.
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