Ring Joint Gaskets are metallic sealing rings suitable for high pressure and high temperature applications and are fitted in ring grooves. They are widely used in the Oil / Petrochemical industry and in valves and pipe work. Choice of material may be determined to suit higher temperatures and aggressive media. They comply with ASME B16.20 standards and API spec 6A.

PRINCIPAL TYPES OF MATERIALS
(Other alloy materials available upon request.)

Metal

  • Soft Iron
  • Low Carbon Steel
  • F5 Alloy Steel
  • Type 410 S/S
  • Type 304 S/S
  • Type 304L S/S
  • Type 316 S/S
  • Type 316L S/S
  • Type 347 S/S
  • Type 321 S/S

Maximum Hardness

  • 90 BHN
  • 120 BHN
  • 130 BHN
  • 170 BHN
  • 160 BHN
  • 160 BHN
  • 160 BHN
  • 160 BHN
  • 160 BHN
  • 160 BHN

NOTE:

  • All dimensions are in mm.
  • R30 is suitable for lapped flanges only.
  • Class 720, 960 and 10000 flanges to API 6B are obsolete. Data is for information only.
  • The 23° surfaces shall have surface finish no rougher than 1.6 µm (63 µin RMS).
  • B,H Variation in height throughout the entire circumference shall not exceed 0.5mm.

IRTJ TYPE R RING JOINT GASKET

The IRTJ type R metal ring joint gaskets are manufactured according to ASME B16.20 and API 6A. The type R oval configuration was the original design and was followed by the type R octagonal which offered more specific contact areas.

NOTE:

  • All 23° surfaces on R and RX gaskets shall have a surface finish no rougher than 1.6µm Ra ( 63 µin RMS ).
  • One pressure-passage hole illustrated in fig.1 < a >. Centerline of hole shall be located at midpoint of dimension “C“.
  • Tolerance on these dimensions is +0, -0.38
  • Tolerance on these dimensions is +0.50, -0
  • Class 720,960, and 2900 flanges to API 6B are obsolete. Data is for information only.
  • Crossover flange connection.
  • A plus tolerance of 0.20 mm for width “A” and height “H ” is permitted, provided the variation in width or height of any ring does not exceed 0.10 mm throughout its entire circumference.

IRTJ TYPE RX RING JOINT GASKET

The IRTJ type RX metal ring joint gaskets are manufactured according to ASME B16.20 and API 6A. The type RX series is of higher strength materials designed primarily for well-head pressures of 700 bar and beyond.

NOTE:

  • All 23° surfaces on BX gaskets shall have a surface finish no rougher than 0.8 µm Ra ( 32 µin RMS ).
  • Radius “ R ” shall be 8 % to 12 % of the gasket height ”H ”. One pressure-passage hole required per gasket on centerline. See fig. 1
  • A plus tolerance of 0.20 mm for width “A” and height “H ” is permitted, provided the variation in width or height of any ring does not exceed 0.10 mm throughout its entire circumference.

IRTJ TYPE BX RING JOINT GASKET

The IRTJ type BX metal ring joint gaskets are manufactured according to ASME B16.20 and API 6A. The type BX series is of higher strength materials designed primarily for special applications involving high pressures up to 20,000 psi.