The energy source for the pump driver shall supply which measure to meet system demand?

The energy source for the pump driver shall supply which measure to meet system demand?

• A. Starting horsepower
• B. Rated horsepower
• C. Peak horsepower
• D. Necessary brake horsepower

Answer: (D)

The energy source must supply the necessary brake horsepower. Brake horsepower is the actual shaft power the pump drive needs to deliver to overcome hydraulic losses and mechanical inefficiencies at the operating point. This is the power that matches the system demand, not just the motor’s rated or peak capability or the power needed only for starting. In other words, to meet the system’s needs, the drive must be able to provide enough power to cover the required brake horsepower throughout operation, including the load and losses incurred.

The energy source must supply the necessary brake horsepower. Brake horsepower is the actual shaft power the pump drive needs to deliver to overcome hydraulic losses and mechanical inefficiencies at the operating point. This is the power that matches the system demand, not just the motor’s rated or peak capability or the power needed only for starting. In other words, to meet the system’s needs, the drive must be able to provide enough power to cover the required brake horsepower throughout operation, including the load and losses incurred.