Each individual plant with LP Gas storage containers shall have a fire extinguisher of what type?

The correct choice is a fire extinguisher with a 1 - 20 lbs. dry chemical BC rating because this type of extinguisher is specifically designed to combat fires involving flammable liquids and gases, such as those associated with LP gas. The 'B' rating indicates its effectiveness against fires ignited by flammable liquids, which is crucial when dealing with LP gas storage.

Additionally, the dry chemical agent works by smothering the flames, which is essential for extinguishing fires that may arise from gas leaks or ruptured containers. A portable extinguisher within this weight range is also manageable for personnel to use effectively in emergency situations.

Other types of extinguishers may not provide the level of protection needed for LP gas fires. For instance, water type extinguishers can be ineffective or even dangerous to use on flammable liquid fires, as water can cause the flames to spread. CO2 extinguishers, while effective for electrical fires and limited classes of flammable liquids, may lack the coverage and effectiveness necessary for larger fires involving LP gas. Foam extinguishers can be useful for certain liquid fires but may not always be present in all locations. Therefore, having a dry chemical BC rated extinguisher is the most suitable