Use of Parallel Pumps – Pony Pumps

Pumps that maintain fluid levels in reservoirs are often sized according to worst-case or peak service conditions. Since the requirements of worst-case conditions are often significantly higher than those of normal operating conditions, many pumps are oversized relative to the demands of their application for most of their operating lives. The penalties of using an oversized pump include frequent energizing and de-energizing of the motor, operation away from the pump’s best efficiency point (BE), and high friction losses—all of which add to energy and maintenance costs.

Adding a smaller pump to handle normal system demand relieves the burden on the larger pump, which can be energized as needed during high load conditions. A smaller pump can operate more efficiently and require less maintenance (US DOE, 2006. p. 27).

Development Status Products

Use of Parallel Pumps – Pony PumpsCosts & Benefits

Parent Process: Pump Systems
Energy Savings Potential

In a Finnish pulp and paper mill, the installation of a smaller (pony) pump running parallel to an existing pump, reduced the overall pumping energy requirements by 58%. (Worrell et. al., 2010. p. 63)

CO2 Emission Reduction Potential

Not available


Not available

Use of Parallel Pumps – Pony Pumps Publications

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27, 48

Energy Efficiency Improvement and Cost Saving Opportunities for the U.S. Iron and Steel Industry

The U.S. Environmental Protection Agency’s (EPA) energy guide, Energy Efficiency Improvement and Cost Saving Opportunities for the U.S. Iron and Steel Industry, discusses energy efficiency practices and technologies that can be implemented in iron and steel manufacturing plants. This guide provides current real world examples of iron and steel plants saving energy and reducing cost and carbon dioxide emissions.

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