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Class of Substance | Notifiable quantity tonnes |
1. Gas or any mixture of gases which is flammable in air and is held in the installation as a gas. | 15 |
2. A substance or any mixture of substances which is flammable in air and is normally held in the installation above its boiling point (measured at 1 bar absolute) as a liquid or as a mixture of liquid and gas at a pressure of more than 1.4 bar absolute. | 25 being the total quantity of substances above the boiling points whether held singly or in mixtures. |
3. A liquefied gas or any mixture of liquefied gases, which is flammable in air, has a boiling point of less than 0°C (measured at 1 bar absolute) and is normally held in the installation under refrigeration or cooling at a pressure of 1.4 bar absolute or less. | 50 being the total quantity of substances having boiling points below 0°C whether held singly or in mixtures. |
4. A liquid or any mixture of liquids not included in items 1 to 3 above, which has a flash point of less than 21°C. | 10,000 |
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