Compressor and Motor

Coordinating a motor with driven equipment involves selecting the proper motor horsepower, comparing motor and driven equipment speed-torque curves, determining required starting time and effect of momentary voltage losses, providing for thrust conditions by using proper coupling and end-play limits, and coordinating bearing lubrication requirements.

Motor horsepower required to operate the compressor is dictated by process plant operating conditions. Usually there are minimum conditions, normal (design) conditions, and maximum conditions. Economic sizing of the motor depends on exercising good judgment when determining capacity to be provided in the motor over the usual maximum operating conditions. Two other factors should be considered: capability of the compressor casing and likelihood that plant requirements will dictate a future change in the rotor to take advantage of casing capability. For a guide to the actual size, API generally recommends that the motor be sized at 110% of the greatest power required by the compressor. This allows some margin for compressor deterioration.

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