Models ISO 40 Tanker (Heavy Fuel Oil Storage Tank) 9 88 2 ISO 40 Tanker (Compartments for fresh lube oil, service lube oil, service lube oil and process water) 13 56 1 ISO 20 Tanker (sludge compartment and diesel) 9 52 1 Biodiesel storage tank UL-142 6 54 1