What size suction header is used in the Type 3 system?

In a Type 3 system, the suction header is a critical component designed to handle the flow of fuel or water effectively. The size of the suction header must be sufficient to ensure that there can be an adequate volume of fluid being drawn into the system without causing significant pressure losses. The 16-inch size is standard for this system, as it provides the necessary capacity to facilitate efficient operation, especially in circumstances where high flow rates are required. Using a larger diameter header minimizes resistance and allows for optimal performance under various operational conditions, which is particularly important in large-scale systems or when multiple pumps are involved.

The other sizes mentioned—6 inch, 8 inch, and 12 inch—would not provide the same level of performance or fluid management expected from a Type 3 system, potentially leading to issues such as cavitation or insufficient fuel supply during peak demands. Thus, the 16-inch suction header is the correct choice for ensuring the system can operate effectively and meet operational requirements.