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Lap Joint Alloy Cost-Saving Estimator
On a corrosive line, a solid weld-neck or slip-on flange must be made entirely from alloy. A lap joint assembly puts the alloy only in the small wetted stub end and backs it with a cheap carbon-steel ring. This tool gives a directional sense of the material saving using your own carbon-steel flange price as the anchor.
Use a price you actually pay — this is the anchor for the estimate.
Premium vs carbon — adjust to your mill quote.
A stub end carries far less metal than a solid flange.
