How many gallons of fuel must be pumped to flush the hydrant loop of a type 3 system containing 42,000 gallons?

In a type 3 water and fuel system, flushing the hydrant loop typically requires a specific volume of fuel—often calculated as a multiplier of the total capacity of the system. In this scenario, since the system contains 42,000 gallons, the flushing procedure necessitates pumping out twice that volume to ensure complete flushing and cleanliness of the hydrant loop.

Therefore, when 42,000 gallons is multiplied by 2, the total amount of fuel required to effectively flush the hydrant loop amounts to 84,000 gallons. This practice ensures that any contaminants or residues within the loop are thoroughly removed, maintaining the integrity and efficiency of the system.