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2.2 Ring Gaskets to fit API Spec 6A Flanges API originally adopted many of the dimensions of the original flanges designated 6B from the RTJ flanges as now listed in ANSI/ASME B16.5. API adopted the same seal rings as well. As API specifications evolved and operators encountered higher pressures, API developed new ring gaskets and new flanges. The RX "pressure energized ring gasket" fits "interchangeably" into API 6B flange ring grooves (view a caution concerning interchanging R and RX ring gaskets in the Flange Make-up Stand-off and Drift section of Web Site Tools on www.woodcousa.com). As higher pressure flanges came online, API introduced the BX ring gasket, then as newer lower pressure flanges appeared, they too had ring grooves to accept BX ring gaskets. The most recent ring gasket designs have the designation SBX and SRX, which have the same dimensions as BX and RX ring gaskets with a special vent hole added to facilitate make-up underwater allowing trapped water to escape from behind the gasket. |
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Although ring gaskets specified by API, fit and seal flanges and hubs appearing in API Spec 6A, 16A, 17D etc., this catalog identifies gaskets by alpha type, number, and material, and shall have individual identification, e.g. R 24 S316-4 with what they fit specifically identified by reference in Table 1 Page 6 of this catalog. Table 1 provides reference for the ring gasket, bolt, tap end stud, and wrench for flanges specified in API 6A, 16A, and 17D etc.. 2.3 Ring Gaskets to fit API Spec 16A Hubs To View a list of currently specified API Spec 16A hubs and the designated ring gaskets specified to fit these hubs, go to Hub and Clamp Reference Chart section of Web Site Tools on www.woodcousa.com. If you find that hubs you may have require a ring gasket other than ones currently specified by API, you probably have older hub designs not adopted by API, now discontinued. These discontinued hubs appear in the Hub and Clamp Reference Chart mentioned above, with asterisks indicating their Non-API status. |
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