What is the standard size of tank truck unloading headers typically used?

The standard size for tank truck unloading headers is typically 4 inches. This size effectively balances the need for efficient flow rates with the structural integrity of the systems used. A 4-inch header allows for adequate volume transfer from the tank truck to the service storage facility without causing excessive pressure drops or flow restrictions, ensuring that the unloading process is both efficient and safe. Using smaller sizes might lead to higher flow velocities, which can create issues such as turbulence and cavitation, whereas larger sizes may not necessarily enhance performance and can be more costly and cumbersome to integrate into existing systems. The choice of this standard size reflects industry practices aimed at optimizing the unloading process while ensuring compatibility across various types of fuel and water systems.