Cargo tank capacity has been on a steady rise over the years. What used to perform the job well is no longer adequate and inefficient. Arrow Tank & Engineering is the industry leader when it comes to adding volume to your existing tank. In most instances, stretches for 73 inch tanks yield up to 3200 gallons and 5000 gallons or more for 80 inch tanks. As part of the process, cargo tanks are updated to the latest ASME and DOT requirements. Likewise, vessel openings are typically upgraded or added to increase performance and facilitate a new piping assembly.