Style BX Ring Joint Gasket
The Style BX ring type joint is manufactured in accordance with API 6A and ASME B16.20. All BX ring type joints incorporate a pressure passage hole to allow for pressure equalization each side of the sealing faces. On assembly, metal to metal contact of the flange faces is achieved. The Style BX is not interchangeable with any other style, and is only suited for API 6BX flanges. Style BX ring type joints are designed to seal pressure up to 20,000 psi in accordance with API 6A pressure ratings.
Dimensions of Style BX Gasket
(a) All dimensions are in millimeters.
(b) Radius, R, shall be 8% to 12% of the gasket height, H.
A = width of ring, +0.20, −0.00
Variation in width throughout the entire circumference of any ring shall not exceed 0.10 within these tolerances.
C = width of flat, +0.15, −0.00
D = hole size, ±0.5
H = height of ring, +0.20, −0.00
Variation in height throughout the entire circumference of any ring shall not exceed 0.10 within these tolerances.
OD = outside diameter of ring, +0.00, −0.15
ODT = outside diameter of flat, ±0.05
R = radius of ring [see General Note (b)]
23 deg p angle, ±0 deg 15 min.
(1) One pressure passage hole is required per gasket as illustrated. The centerline of the hole shall be located at the midpoint of
Pipe Sizes & Pressure Ratings for Style BX Gaskets in Flange Application
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