API APPROVED RING JOINT GASKETS

Category: GASKET
Please call 065-991-1978 or email us : sales@ugs.co.th

24 April 2021

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API ring joint gaskets come in two basic types, an oval cross section and octagonal cross section.
These basic shapes are used in pressures up to 10,000 psi. The dimensions are standardized and
require specially grooved flanges. The octagonal cross section has a higher sealing efficiency than
the oval and would be the preferred gasket. However, only the oval cross section can be used in the
old type round bottom groove. The newer flat bottom groove design will accept either the oval or the
octagonal cross section. The sealing surfaces on the ring joint grooves must be smoothly finished
to 63 microinches and be free of objectionable ridges, tool or chatter marks. They seal by an initial
line contact or a wedging action as the compressive forces are applied. The hardness of the ring
should always be less than the hardness of the flanges. Dimensions for API ring joint gaskets and
grooves are covered in ANSI B 16.20 and API 6A.