24

Fig. 31-46 Paybacks for Steam Turbine Drive vs. Base Case and VFD Option.

Fig. 31-46 Paybacks for Steam Turbine Drive vs. Base Case and VFD Option.

requirement for the two prime mover options are based on somewhat optimal installation conditions. Pricing is based on the assumption of a logistically straight-forward installation. Any additional system modifications required for the installation would add to the capital cost and, therefore, increase the payback period.

In the case of the steam turbine driver, it is assumed that all of the rejected heat, in the form of low-pressure steam, can be effectively used without any significant system modifications. If all of the heat cannot be used during each period of operation, or if system modifications were required to allow for the use of this heat, such as a requirement for additional piping, economic performance would be decreased.

In the case of the reciprocating engine driver, no consideration has been given to heat recovery. If heat recovery was included in the analysis, the capital cost would be increased to account for the heat recovery system and the annual O&M cost would also be increased. However, the annual fuel consumption would be decreased by as much as half. The net impact would be improved economic performance, demonstrated by a shorter payback period on the incremental investment.

Still, while these are just simplified examples, based on only one set of assumptions, the general conclusion holds true that alternative driver options that feature variable speed control can produce attractive economics for pumping applications.

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