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Industry Thermal engineering
Predecessor Eriksen Engineering
Headquarters Fenton, Missouri, USA
Area served
Key people
Vernon Eriksen (President, 1987-2012)
Products Heat recovery steam generators
Parent Nooter Corporation
Subsidiaries Nooter/Eriksen Environmental Technologies
Website Nooter Eriksen

Nooter Eriksen, also known as Nooter/Eriksen or N/E, is a supplier of heat recovery steam generators (boiler technology), which are mostly found in combined cycle gas turbine power stations (CCGTs). These are also found in combined heat and power (CHP) systems, which tend to have a much smaller power output than CCGT stations.


Nooter Corporation was established in 1896. Nooter/Eriksen Cogeneration Systems was established in 1987 when Eriksen Engineering (headed by Vernon Eriksen) was taken over by the Nooter Corporation. Vernon Eriksen had joined Econotherm Corporation in 1985, which became Eriksen Engineering.

In the 1990s the market for heat-recovery steam generators for combined cycle gas turbines started. The company reached its peak for orders (c. 18,000 MW of plant) in 2001.[1]


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It makes heat recovery steam generators (HRSGs) for gas turbine units of over 8MW in power.[3] Most of its units are for the 125-200MW power range. It has made over 800 HRSGs for use in CCGTs around the world. Around 380 of these HRSGs include supplementary firing. The HRSG can boost the thermal efficiency from around 30-40% to over 60%.

In the USA in 2004 it had 57% of the market for HRSGs. Alstom and Vogt Power International had 14% each, Deltak had 7% and IST had 5%.


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