60028 - Testing and Acceptance of Semi-Machined Turbine Rotor Forging Elements
Turbine wheels are critical Elements and the integrity of their forgings is extremely important. Each wheel forging is oversized at its outside diameter in order to provide ample amount of material from which test specimens can be cut out. Test specimen dimensions are in accordance with relevant ISO and ASTM standards. The test specimens are divided into two groups; first group tension and second group impact. Tension and impact tests are conducted in presence of the Owner at room temperatures, at elevated temperatures and at sub-zero temperatures. Once all specimen pass the rigorous Certified Laboratory tests, the semi-machined forgings are sent to the Machining Facility. Once the Machining of the forging is completed the Elements will be sent to the vacuum chamber for over-speed tests at sub-zero temperatures and elevated temperatures. The over-speed under sub-zero temperatures is the ultimate test of the forgings. Over-speed testing of the forgings under elevated temperatures serves to minimize the tension stresses concentrated at the bore of the wheel and convert them to compressive stresses. The above described tests of turbine Elements forging are critical when the Owner selects third Party to reverse engineer and manufacture these elements. This paper details the selection of the tests, the execution of the testing program, acceptance of the results and how this helps to ensure high integrity critical Elements for a mid-size heavy industrial frame gas turbine.
Testing and Acceptance of Semi-Machined Turbine Rotor Forging Elements
Paper Type
Technical Paper Publication
Description
Session: 18-05 Digitization, Testing and Validation
Paper Number: 60028
Start Time: June 11th, 2021, 02:15 PM
Presenting Author: Steve Ingistov
Authors: Douglas Nagy Liburdi Turbine Serv Inc
Steve Ingistov Watson Cogeneration, Marathon Petroleum