Founded in 1931, purchased by Circor in 2017

During what he later described as a "boring night at a factory test room", Carl Montelius sketched out an idea for a pump with three intermeshing screws, rotating in a manner that would make them mutually sealing.

A respected Swedish engineer with 60 patents already to his credit (including the first pay telephone), Montelius regarded the interesting rotors as an amusing intellectual puzzle, working almost every evening during 1923 to develop the mathematical algorithms of the threads. In 1931, Montelius linked with financier Bengt Ingestrom and formed Aktiebolaget IMO-Industri, taking the name IMO from their own names Ingestrom and Montelius.

Headquarters Plant: Monroe, NC, USA - An ISO 9001 approved quality management system oversees production of high performance industrial three screw pumps and three screw pumps for Naval combat and support ships. This plant includes Imo Pump research and development and all headquarters facilities and personnel. A fabrication facility is an integral part of the operation and uses qualified welders and weld procedures.

Columbia, KY, USA facility is an all-manufacturing operation producing high pressure gear pumps and all the large production quantity three screw pumps. Its quality management system is ISO 9002 approved.

Together, these plants produce high quality pumps for hydrocarbon and chemical processing, crude oil transport, Navy and commercial marine, power generation, pulp and paper, hydraulic elevator and general industrial machinery.

Imo - Model 4U/4T Series - Three Screw Pump - Brochure