What is the maximum amount of flammable liquid allowed in a pre-existing lab type I?

The maximum allowable amount of flammable liquid in a pre-existing lab classified as type I is 30 gallons. This regulation is established to ensure safety and minimize the risks associated with flammable materials, which can lead to fire hazards and explosions if not managed properly. Limiting the quantity helps to mitigate the potential impact of a fire incident and provides a control measure in the event of an accident. Therefore, 30 gallons is the threshold that balances operational needs with safety considerations in a type I laboratory setting.