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PROCESS EQUIPMENT UPDATE


STRESS


procedures and preventative maintenance techniques, problems can still arise. Resolving one of the more serious issues, that of stress corrosion cracking, can often be achieved in a straightforward manner by accurately identifying the causes. Older steam turbines are prone to


stress corrosion cracking of the turbine blades for a number of reasons and understanding the causes and potential


8 www.engineerlive.com


RESOLUTION S


team turbines are used across the world as a source of power for many different industries. Even with the best maintenance


solutions can help to minimise downtime and improve reliability. In this case, reviewing the findings of two examples will enable operators of similar equipment to modify existing processes and make their own checks during planned outages. By examining case studies and in- depth analysis of equipment failures, it is possible to introduce new strategies that will benefit a business in the future. Using information gained by OEMs and expert maintenance providers such as Sulzer allows similar issues to be avoided.


The causes and resolution of stress corrosion cracking in steam turbines


CASE STUDY NUMBER 1: MICROSCOPIC INVESTIGATION In the first case, the row six disk of an integral steam turbine rotor developed cracks in the root sections of the blades. Te turbine had an operating speed of 9,900 rpm and the steam inlet temperature was 400°C. Te equipment had been well maintained and the service history was available to the maintenance engineers. Te root of each blade is under


particularly high mechanical load and the design of this rotor used two root lengths to offset the stress loading and to minimise the risk of cracking in the


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