Recorded Webinar

MD&A’s Diaphragm Dishing Issues Webinar

Posted to MD&A in the Generation Professionals Group
image credit: MD&A
Jay Eldridge's picture
Vice President Sales & Marketing, MD&A

Bachelor of Science (BS) in Mechanical Engineering with a Mathematics Minor from Union College.  28 years’ experience working in the power generation industry.  Almost 17 of those years were...

  • Member since 2013
  • 49 items added with 73,390 views
  • Mar 28, 2023

MD&A Webinars | Managing Emergent Findings during Overhaul: "Diaphragm Dishing Issues" 

The Diaphragm Dishing presentation will cover types of diaphragm construction, causes of diaphragm dishing, signs of dishing, and give examples of diaphragm failures. Repair options with photos are shown including structural repairs with weld replacement and the addition of bridges. New manufacture and nozzle plates are also included.

Customer takeaways from the session:

A) Dishing is the permanent downstream deflection of a diaphragm due to high temperature creep.

B) Insufficient main weld depth, weak weld material, inadequate partition cross-section, a lack of bridges, running overtemperature and poor weld quality can all contribute to diaphragm dishing.

C) Opening axial clearances to the diaphragm webs and HiLo packing teeth should be reviewed early in an outage for signs of diaphragm dishing.

D) Structural dishing repairs during an outage can include increasing weld depth and adding bridges to correct the original design/manufacturing deficiencies.

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Mechanical Dynamics & Analysis (MD&A) provides power generators around the globe with a full-service, OEM-alternative for services, parts, and repairs for Gas Turbines, Steam Turbines and Generators.

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