Driver limit

Driver limit. This means the motor is tripping off on high amperage. Or, the turbine is running below its set speed. 

A turbine-driven pump is said to be driver-limited when the governor speed-control valve is wide open. This speed-control valve, is usually called the Woodward governor. It is not that easy to see if the governor is really wide open. A few simple methods to make this determination are... 

As well as not having to complete a log, these drivers (the drivers using the 395.1(e) exceptions) are also not required to take a 30-minute break after 8 horms of work, if they wish to start or continue driving (see the discussion on this requirement in the discussion of driver limits, 395.3, coming shortly). 

Meyer, J. (2006). Helping drivers limit distraction Some lessons from a failed idea. Ben Gurion University of the Negev, Israel. Unpublished manuscript. 

Because the driver is the controlling element in the road-vehicle-driver system, there is a tendency - especially on the part of authorities - to blame the driver for crashes that may in fact be due to other system failures. This tendency is amplified when the people who set traffic safety policies fail to recognize legitimate driver limitations. 

If we cannot open the discharge control valve of a centrifugal pump 100 percent before the FLA point is reached, then we say that the pump is driver-limited. This is a frustrating problem for plant operators, and clearly reflects poor design practice in undersizing the motor driver horsepower. 

Driver-limited A pump that is limited by the horsepower of its turbine or... 

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