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The total annual energy savings are strongly dependent upon the facility energy cost
and the hours per year of feedwater pump operation. Annual energy savings are given
in the table below for various electrical rates and pump operating schedules. In
addition to operating cost savings, steam turbine maintenance costs should be
compared with electric motor maintenance expenses.
Electricity Feedwater Pump Annual Operating Hours
Costs, $/kWh 2,000 4,000 6,000 7,000 8,760
0.04 2,830 5,650 8,480 9,900 12,380
0.05 7,540 15,080 22,620 26,390 33,020
0.075 19,320 38,640 57,960 67,620 84,620
* Savings are based upon operation of a 300-hp steam turbine drive with a steam rate of 26 lb/hp-hr. A natural
gas cost of $8.00/MMBtu is assumed.
Steam Turbine Flexibility
Equipment redundancy and improved reliability can be obtained by mounting a steam
turbine drive and an electric motor on opposite ends of the driven-equipment shaft.
You can then select either the motor or turbine as the prime mover by increasing or
decreasing the turbine speed relative to the synchronous speed of the motor.
Steam Tip Sheet information adapted from material provided by the TurboSteam
Corporation and reviewed by the DOE BestPractices Steam Technical Subcommittee.
BestPractices is part of the Industrial
Technologies Program Industries of the
Future strategy, which helps the country's
most energy-intensive industries improve
their competitiveness. BestPractices brings
together emerging technologies and best
energy-management practices to help
companies begin improving energy efficiency,
environmental performance, and productivity
BestPractices emphasizes plant systems,
where significant efficiency improvements
and savings can be achieved. Industry gains
easy access to near-term and long-term
solutions for improving the performance of
motor, steam, compressed air, and process
heating systems. In addition, the Industrial
Assessment Centers provide comprehensive
industrial energy evaluations to small- and
FOR ADDITIONAL INFORMATION,
EERE Information Center
Industrial Technologies Program
and Renewable Energy
U.S. Department of Energy
Washington, DC 20585-0121
A STRONG ENERGY PORTFOLIO
FOR A STRONG AMERICA
Energy efficiency and clean, renewable
energy will mean a stronger economy, a
cleaner environment, and greater energy
independence for America. Working
with a wide array of state, community,
industry, and university partners, the U.S.
Department of Energy's Office of Energy
Efficiency and Renewable Energy invests in
a diverse portfolio of energy technologies.
Steam Tip Sheet #21
Revised from DOE/GO-102002-1475 " January 2002
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Consider Steam Turbine Drives for Rotating Equipment, report, January 1, 2006; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc879223/m1/2/: accessed January 15, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.