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Two of the most common issues that power plant owners and operators face in the HP Evaporator section areUnder-deposit Corrosion (UDC) andCorrosion-Fatigue. In this short article we will cover UDC and what key actions should be taken to predict and prevent costly forced outages.
Tetra Engineering is a small company working in the power generation sector. We specialise in providing engineering and technical support to owners and operators of CCGT power plants, as well as other thermal plants. We have an office near Nice in France and our headquarters is in Connecticut, USA. We support projects worldwide and this includes hands-on fieldwork and back office engineering analysis...
Peter Jackson, President of Tetra Engineering Group was invited to present Tetra's experience on Purge Credit implementations at the 501F User Conference this February (2019).Combined cycle power plants use fuels and other materials that can cause fires or explosions in the combustion turbine, ducting, or heat recovery steam generator. Purging that equipment with ambient air to displace residual combustible gases before starting is a normal safety practice. But when plants are cycled, the disadvantages of purging often outweigh the advantages.
During the startup of the triple-pressure HRSGs, plant staff noticed steam coming from the stack and a discrepancy between feedwater and steam flows. On shutting down the unit a T23 superheater tube was found with a complete circumferential failure. The failed tube was removed and the bore was plugged with some difficulty due to poor access and the uncommon material.
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