Machine-building complex includes close-related fields of machine-building, such as power-engineering, electrical engineering, radioelectrnics, instrument building, device-building, transport, agriculture, etc. For the value of products manufactured and the number of employees, machine-building is in the first place among the industrial fields. Currently, many companies successfully realize the quality management of equipment produced in compliance with the requirements of ISO 9001 certificate. At the same time, the majority of oil-gas equipment are manufactured in compliance with the specifications of American Petrolium Industry (API).