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Question: Please advise about the difference between oval ring joint gaskets and octagonal ring joint gaskets? Answer: API specifies only "Type R", with both oval and octagonal profiles designated. Some very old flanges that utilize Type R ring gaskets have ring grooves with rounded bottoms, and specifications for these flanges called for the use of oval gaskets in these grooves, but current specifications for API flanges no longer show these rounded bottom grooves. In actual practice oval gaskets seem to coin easier than octagonal gaskets so we at WOODCO USA prefer oval gaskets for make-up and test, otherwise we find no difference. For more information about ring gasket sealing and selection, see: Field Appraisal of Ring Grooves, Ring Gasket Handling and Inspection, and Test Rack Tips
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