The fourth edition of the American Petroleum Institute (API) Standard 682 was released in May 2014. The May edition includes several updates to reflect the changing design and application needs of mechanical seals. Annex G defines several new piping plans and associated auxiliary hardware. Piping Plan 03 is defined as as dead-ended seal chamber with a tapered bore and no throat bushing. Tapered bore seal chambers are well-established in many industries. These designs have significant performance differences from traditional, closed-throat cylindrical bore seal chambers, which are defined separately in Piping Plan 02.
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