What is a requirement for a Mobile Water Supply (MWS) apparatus that has a fire pump according to NFPA 1901?

The requirement for a Mobile Water Supply (MWS) apparatus with a fire pump, according to NFPA 1901, states that a tank to pump line must be at least two inches in diameter. This specification ensures that there is sufficient water flow and pressure available to the fire pump, facilitating effective firefighting operations. A line of this size helps to prevent restrictions in water movement, thereby minimizing the potential for pressure drops that could negatively impact the pump's performance.

While there are other important factors to consider regarding water supply systems and pumping capacities, the focus on a minimum two-inch diameter line directly addresses the need for adequate flow rates and operational efficiency, which are critical during firefighting scenarios. This ensures that fire personnel can quickly and effectively access water to combat fires, making it a fundamental requirement in the design of fire apparatus.