Inspection and Refurbishment of Second-Hand Turbine Diaphragms
Release time:
2026-04-09
Source:
The diaphragm is a key stationary component in steam turbines, directing steam flow between stages. This article covers the evaluation process for second-hand diaphragms, including concentricity checks, seal strip wear, and repair options. A well-maintained diaphragm ensures efficiency and reliability.
In a second-hand steam turbine, diaphragms often show signs of steam cutting, distortion, or seal strip deterioration. The diaphragm carries stationary blades (nozzles) and labyrinth seals that minimize leakage across stages. Before reusing a diaphragm, measure the inner and outer concentricity. Distortion exceeding 0.1 mm across the diameter typically requires machining or replacement.
Seal strips are the most vulnerable part. Worn or rounded teeth increase steam leakage, reducing turbine efficiency by 2–5%. Fortunately, seal strips are replaceable. The diaphragm body, usually made of cast iron or fabricated steel, should be checked for cracks near the blade attachment grooves. Minor cracks can be repaired by welding and stress-relieving, but deep cracks through the vane ring demand replacement.
Diaphragm half-joints (horizontal split) must seal perfectly to prevent cross-flow. When purchasing second-hand diaphragms, request original clearance records. A diaphragm that passes these checks, combined with new seal strips, can restore near-original stage efficiency. Always match the diaphragm to the correct stage position, as nozzle angles vary.
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