Liquid Ring Vacuum Pumps, Compressors and Systems: Conventional and Hermetic Design

Helmut Bannwarth studied mechanical engineering at the Technical University of Ulm, Germany, completing his engineer's degree in 1963 with technical stream machines as subject.
He began his professional career at Escher Wyss AG in Zurich, Switzerland, as a project and calculations engineer for Kaplan, Francis and Pelton type turbines and pumping turbines for hydroelectric power stations. After additional qualification as a welding engineer, he returned to Germany in 1968 to take on a position at the joint companies Lederle GmbH, Freiburg, and Hermetic-Pumpen GmbH, Gundelfingen.
Since 1980 he has been General Sales Manager at the Lederle/Hermetic group, and is now also Authorized Representative for the company.
He has previously authored two very successful German editions of this book as well as contributing to the book Foundations of Vacuum Science and Technology edited by J. M. Lafferty, and has published numerous scientific papers on pumps and vacuum systems.