Commissioning and testing has been a core component of the consulting and design work developed at JDA Consulting Engineers since 1990. Our firm’s experience suggests that VSD technology has become a panacea for solving the complex design issues that relate to centrifugal pump selection. As JDA’s team commissions large, complex mechanical plants, we find more systems where the VSD is practically abandoned in place. Rather than providing the precise control of flow and pressure or reducing energy consumption and demand, the VSDs appear to be “stuck” at a single speed.