Case study describing a project which configured a printing machine so that it consumes less compressed air and required lower pressure to operate effectively. Project replicated throughout the company, leading to energy cost savings of $200,000 per year, or 2.9 million kilowatt-hours.
This case study highlights International Truck and Engine Corporation's optimization project on the compressed air system that serves its foundry, Indianapolis Casting Corporation. Due to the project's implementation, the system's efficiency was greatly improved, allowing the foundry to operate with less compressor capacity, which resulted in reduced energy consumption, significant maintenance savings, and more reliable production.
This case study describes an optimization project implemented on a fan system at Ash Grove Cement Company, which led to annual energy and maintenance savings of $16,000 and 175,000 kilowatt-hours (kWh). In 1999, Ash Grove Cement Company implemented an optimization project on a fan system in its cement plant in Durkee, Oregon. Because of a severe vibration problem, the fan system would often fail and require frequent repairs to the ductwork and adjoining machinery. The plant replaced the belt drive with an Adjustable Speed Drive (ASD) to improve the control of the fan system and lower its energy consumption. This change eliminated the vibration problem and improved the system's airflow control and energy efficiency. The project led to annual energy and maintenance savings of $16,000 and 175,000 kilowatt-hours (kWh). In addition, the fan system's improved reliability allowed the plant to achieve its desired production level. Because of partial funding from the Northwest Energy Efficiency Alliance (NEEA), the total project cost was approximately $10,000, which gave the Durkee plant a simple payback of 7.5 months.
3M conducted an in-house motor system study in 29 buildings at the 3M Center. The company evaluated approximately 1,000 electric motors and upgraded systems, resulting in reduced electricity use and cost savings of $77,554 per year.
In the 1990s, a subsidiary of the Citation Corporation, Interstate Forging, implemented a compressed air system improvement project at its Milwaukee, Wisconsin, forging plant. This improvement enabled the plant to maintain an adequate and stable pressure level using fewer compressors, which led to improved product quality and lower production downtime. The project also yielded annual energy savings of 820,000 kWh and$45,000. With a total project cost of$67,000, the plant achieved a simple payback of just 1.5 years.
Progressive Powder Coating in Mentor, Ohio, is a metal finishing plant that uses a convection oven in its manufacturing process. In an effort to save energy and improve production, the company installed an infrared oven in between the powder coating booth and the convection oven on its production line. This installation allowed the plant to increase its conveyor line speed and increase production by 50 percent. In addition, the plant reduced its natural gas consumption, yielding annual energy savings of approximately$54,000. With a total project cost of$136,000, the simple payback is 2.5 years.