PE R Ring joint gaskets are manufactured in accordance with both API 6A and ASME B16.20 size and ratings. Available in both oval and octagonal configurations, both types are interchangeable on modern octagonal type grooved flanges. Style R Ring Joint Gaskets can be manufactured in accordance with all relevant standards to suit the following flange designations: API-6A, ASME/ANSI B16.5, MSS SP44 (ASME B 16.47 Series A) & BS1560.
Width of Ring --- +/- 0.2;
Height of Ring --- +/- 0.4;
Pitch Diameter --- +/- 0.18;
(Octagonal) Angle of 23o --- +/- 0.5o
Style R Selection Chart
X Ring joint gasket is a pressure-energized adaptation of the standard Type R Gasket. The RX is designed to fit the same groove design as a standard Style R, making the joint interchangeable. The modified design uses a pressure-energized effect that improves the efficiency of the seal as the internal pressure of the system increases.
Width of Ring --- +0.20 ~ -0.00;
Height of Ring --- +0.20 ~ -0.00;
A plus tolerance of 0.2mm for width and height is permitted, provided the variation in width or height does not exceed 0.10mm throughout its entire circumference.
OD of Ring --- +/-0.51 ~ -0.00;
Angle of 23o --- +/-0.5o
Note: only ring RX82 through RX91 have a pressure passage hole through the cross section. Center line of hole is located on the mid-point of the width flat.
Hole diameter shall be as follows:
RX-82 through RX-85 --- 1.52;
RX-86 and RX-87 --- 2.29;
RX-88 through RX-91 --- 3.05/
Style RX Selection Chart
BX Ring Joint Gaskets pressure energized gaskets are manufactured in accordance with API 6A and are designed for use on pressurized systems up to 20,000 PSI.
When correctly fitted, the BX Ring Joint allows virtual surface-to-surface contact of the flange faces, which means that the gasket is fully trapped on both the inner and outer diameters.
All BX Ring Gaskets incorporate a pressure balance hole to ensure equalization of pressure that may be trapped in the grooves.
Width of Ring --- +0.20 ~ -0.00;
Hole Size --- +/- 0.5;
Height of Ring --- +0.20 ~ -0.00;
OD of Ring --- +0.00 ~ -0.15;
Angle of 23o --- +/- 0 deg 15 min
One pressure passage hole required per ring on center line. A plus tolerance of 0.2mm for width of ring and height of ring is permitted, provided the variation in width or height does not exceed 0.10mm throughout its entire circumference.
Note: Radius of the ring shall be 8% to 12% of the ring height.
Types of Spiral Wound Gasket
Basic construction, inner and outer diameters are reinforced with several piles of metal without filler to give greater stability and better compression characteristics. Suitable for tongue and groove or male and female or grooved to flat face assemblies.
Solid inner metal ring acts as a compression stop and fills the annular space between flange bore and the inside diameter. Designed to prevent accumulation of solids, reduce turbulent flow of process fluids and minimize erosion of flange faces. Suitable for male and female pipe flanges.
Utilizes an external ring which accurately centers Gasket on flange face: provides additional radial strength to prevent Gasket blowout and acts as a compression stop. A general purpose Gasket suitable for use with flat face and raised face flanges.
Suitable for use with flat face and raised face flanges and specified for high pressure/temperature service or where corrosive or toxic media are present. Note on use of inner rings: ASME B16.20 which covers spiral wound Gaskets requires the use of solid metal inner rings in Pressure Class 900, nominal pipe sizes 24" and larger, Pressure Class 1500, nominal pipe sizes 12" and larger, Pressure Class 2500, nominal pipe sizes 4" and larger, All PTFE filled Gaskets
Type HE Gaskets are used for heat exchangers where pass bars may be required. The outer portion is of standard spiral wound construction, whereas the rib partition is normally of single or double jacketed Type, securely fastened to the I.D. of the spiral wound portion.
This Type is identical to the Type HE, except that it is fitted with an outer guide ring.
Type HE-CGI With Spiral Wound Outer Ring
The Type HE-CGI is a variation of the Type CGI spiral wound Gasket, developed for use on heat exchanger TEMA type flange arrangements. In conjunction with an inner ring, the standard spiral wound construction also supports an outer wound steel nose, designed for the purpose of accurate Gasket location. It is also available with solid metal outer ring.
This Type designates a specially sized CG Gasket to be used on standard ring joint flanges. The outer ring is dimensioned to cover the ring joint grooves and to prevent the spiral wound portion from entering the groove. This type of Gasket should be used only as a maintenance repair item.
Type 625 spiral wound Gaskets are similar to Type R Gaskets, with a thickness of 0.0625". These Gaskets are widely used wherever space restrictions indicate the need for a wafer thin Gasket design capable of sealing high pressures.
These Gaskets are used for boiler handhole and tube cap assemblies. They are available in round, oval, obround, square, pear and diamond shapes. Please note Type T Gaskets rely on internal pressure in the boiler to properly seat the Gasket. This means, when a hydrostatic test is performed on the Gasket, the pressure exerted against the plate will further compress the Gasket-and it is necessary to tighten each nut to compensate for the additional compression of the Gasket under load.
A "Heat Exchanger Gasket" is a term that has been giving to the gasket that is called out for use in an exchanger. The make up of the gasket or type varies due to the operating conditions of the exchanger. Metallic gaskets can come in different types like Double Jacket, Single Jacket, Solid Metal or a Spiral Wound. Soft compressible material can be Rubber, CAF, PTFE, or Non-Asbestos Compressed sheet type.
Single Jacketed Gaskets
The filler material is enclosed in a metal jacket which covers the inside and outside diameter of the gasket.
Double Jacketed Gaskets
The filler material is completely enclosed by a two piece metal jacket, which covers both the inside and outside diameters and both contact surfaces.
Solid Corrugated Metal Gaskets
As the name suggests, the solid corrugated metal gasket is comprised solely of metal and does not contain any non-metallic fillers in its construction. The temperature limitation of the gasket is therefore only effected by the metal selected.
Lens Type Gasket
A Lens Type Gasket is a line contact seal for use in high pressure piping systems and in pressure vessel heads. The lens cross section is a spherical gasket surface and requires special machining on the flanges. In ordering lens gaskets, complete drawing and material specifications must be supplied.
A delta gasket is a pressure actuated gasket used primarily on pressure vessels and valve bonnets at very high pressures in excess of 5000 PSI. As with the lens gasket, complete drawings and material specifications must be supplied. Internal pressure forces the gasket material to expand when the pressure forces tend to separate the flanges. Extremely smooth surface finishes of 63 microinches or smoother are required when using this type of gasket.
The bridge-man gasket is a pressure activated gasket for use on pressure vessel heads and valve bonnets for pressures of 1500 PSI and above. The cross section of the gasket is such that internal pressure acting against the ring forces it against the containing surface making a self-energized seal. Bridge-man gaskets are frequently silver plated or lead plated to provide a softer surface and minimize the force required to flow the gasket metal into the flange surface.
Another gasket concept with origins from the German industrial market are weld gaskets. As standard, two variants exist; Weld Membrane Gaskets in accordance with DIN 2695 and Weld Ring gaskets.
Corrugated Metal Graphite Gaskets
It is manufactured with flexible graphite sheet adhered to both gasket faces, This type of gasket makes an excellent product for both standard flange gaskets and heat exchanger type gaskets where there is low bolt load or high available gasket stresses.
This gasket offers:
Corrugated Metal PTFE Gaskets
Corrugated Metal faced on both sides with expanded PTFE. The standard construction features a corrugated 316 SS metal core. The design of this type gasket allows for a wide variety of metals to select from to meet special process criteria. The PTFE selection for the face material gives you the chemical resistance for aggressive applications.
This gasket has features that reward the user with benefits:
Corrugated Metal PTFE Gasket can be used in temperatures of up to 500°F (260°C).
"RTJ" (Ring Type Joint) gaskets are manufactured in accordance with API-6A and ANSI B16.20 specifications. RTJ's have "R" numbers assigned to them for pipe size and pressure class identification. Stock materials include soft iron, low carbon steel, 4-6 chrome (f5), 304, 304L, 316, 316L, 347, Monel, Inconel and Incoloy.
API Ring Joint Gaskets
API Ring Joint Gaskets come in two basic types, an oval cross section and an 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.
BX and RX Ring Gaskets
The BX ring gasket differs from the standard oval or octagonal shape in that it is square in cross section and tapers in each corner. BX can only be used in API 6BX flanges. RX ring gaskets are similar in shape to the standard octagonal ring joint gasket but their cross section is designed to take advantage of the contained fluid pressure is effecting a seal. They are both made to API 6A.
Special Ring Type Joint Gasket
For critical and non standard applications, where ring type joints are unsuitable in their standard form, FLIPS India Engineering offers a range of specialized ring type joint gaskets to suit the needs of the petrochemical industry.
Excel Metal & Engineering Industries
No. 177/ 181, J. T. Building, Dr. M. G. Mahimtura Marg 3rd Kumbha, Rwada Lane,
Mumbai-400004, Maharashtra, India