What is the most common type of American Petroleum Institute (API) 610 pump used in Air Force (AF) fuel systems?

The most common type of American Petroleum Institute (API) 610 pump used in Air Force fuel systems is the single-stage centrifugal, radial-split case, with end suction and top discharge. This type of pump is favored for its efficiency and simplicity in design, making it well-suited for the specific requirements of fuel handling in military operations.

The single-stage configuration is ideal for applications where the required head and flow rates fall within a manageable range, allowing it to effectively transfer fuels without the complexity of multi-stage designs. The radial-split case design provides ease of maintenance, as it allows for quick access to internal components for inspection and service, which is crucial in military contexts where downtime needs to be minimized.

The end suction and top discharge configuration enhances the pump's operation by facilitating efficient fluid flow into and out of the pump, reducing the potential for air locking and ensuring a steady flow of fuel. This design also allows for a more compact installation, which is another important factor in the space-constrained environments often found in Air Force fuel systems.

In summary, this configuration aligns with operational needs, maintenance considerations, and efficiency standards, making it the most prevalent choice for the Air Force's fuel system applications.