The efficiencies of various full-face and face-relieved flanges in producing a steam-tight seal for split-casing turbine designs have been determined with two-dimensional photoelastic models. Checks on the results carried out on a few of the flange geometries by means of finite-element techniques of analysis showed good agreement between the two. It was concluded that within the scatter of experimental results no difference in the effectiveness of sealing exists between full and relieved flanges.
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