The Style R ring type joint is manufactured in accordance with API 6A and ASME B16.20, to suit API 6B and ASME B16.5 flanges.
Style R ring type joints are manufactured in both oval and octagonal configurations. Both styles are interchangeable on the modern flat bottom groove, however only the oval style can be used in the old type round bottom groove.
Style R ring type joints are designed to seal pressure up to 6,250 psi in accordance with ASME B16.5 pressure ratings and up to 5,000 psi in accordance with API 6A pressure ratings.
Drawing of Style R Ring Joint Gasket
Dimensions of Style R Gasket
(a) All dimensions are in millimeters.
A = width of ring, ±0.20
B, H = height of ring, +1.3, −0.5
Variation in height throughout the entire circumference of any given ring shall not exceed 0.5 within these tolerances.
C = width of flat on octagonal ring, ±0.20
P = average pitch diameter of ring, ±0.18
R1 = radius in ring, ±0.5
23 deg = angle, ±0 deg 30 min.
Pipe Sizes & Pressure Ratings for Style R Gaskets in Flange Application
GENERAL NOTE: End flanges to API 6D and API 600 use gaskets for equivalent pipe size under ASME B16.5 or ASME B16.47 series A.
(1) Class 720, 960, and 10000 flanges to API 6B are obsolete. Data are for information only.
(2) R-30 is for lapped joint only.