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R-41
Inconel 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. This material composition retains structural stability across a wide temperature range, and demonstrates resistance to corrosion from sulfuric acid, chloride-ion environments, and oxidizing atmospheres at elevated temperatures. The alloy’s titanium addition contributes to stabilization against sensitization during welding, which preserves corrosion resistance in welded assemblies. This property is relevant for flange connections located near welded pipeline joints, where thermal exposure during fabrication can affect gasket material performance.
For industrial operations involving corrosive media and high thermal loads, gaskets manufactured from Inconel 825 maintain dimensional stability and sealing performance without rapid material degradation. The material retains mechanical strength at temperatures up to 1000°F (538°C), supporting use in high-temperature process systems where non-metallic gasket materials would fail.
This ring type joint (RTJ) gasket is produced in compliance with API 6A specifications for wellhead and Christmas tree equipment. The BX style energized ring design incorporates a pressure passage hole to enable pressure equalization on both sides of the sealing faces, which supports installation and pressurization in high-pressure systems. The precision-machined sealing surfaces form a metal-to-metal seal when compressed between flange grooves, creating a tight seal under rated working pressures.
All gasket dimensions are machined to tolerances specified in API 6A, ensuring consistent fit within standard flange grooves. Metal-to-metal sealing via RTJ gaskets eliminates the risk of elastomer degradation that occurs with non-metallic gaskets at high temperatures or in contact with hydrocarbon media. BX style ring joint gaskets are engineered for use with API 6BX flanges. This style is not interchangeable with R or RX style gaskets, and is intended for pressure classes from 10000 to 20000 as defined in API 6BX standards. Gaskets are available in nominal sizes from 1 11/16 inch to 30 inches, covering most common flange specifications in upstream oil and gas operations.
RING NO. | 2000 | 3000 | 5000 | 10000 | 15000 | 20000 | OUTSIDE DIAMETER OF RING OD | HELCHT OF RING H | WIDTH OF RING A | HOLE SIZE D | GASKET WEIGHT LBS FOR APL FLANGES |
|---|---|---|---|---|---|---|---|---|---|---|---|
BX150 | – | – | – | 1 11/16 | 1 11/16 | – | 72.19 | 9.30 | 9.30 | 1.59 | 0.295 |
BX151 | – | – | – | 1 13/16 | 1 13/16 | 1 13/16 | 76.40 | 9.63 | 9.63 | 1.59 | 0.337 |
BX152 | – | – | – | 2 1/16 | 2 1/16 | 2 1/16 | 84.68 | 10.24 | 10.24 | 1.59 | 0.425 |
BX153 | – | – | – | 2 9/16 | 2 9/16 | 2 9/16 | 100.94 | 11.38 | 11.38 | 1.59 | 0.425 |
BX154 | – | – | – | 3 1/16 | 3 1/16 | 3 1/16 | 116.84 | 12.40 | 12.40 | 1.59* | 0.632 |
BX155 | – | – | – | 4 1/16 | 4 1/16 | 4 1/16 | 147.96 | 14.22 | 14.22 | 1.59 | 0.875 |
BX156 | – | – | – | 7 1/16 | 7 1/16 | 7 1/16 | 237.92 | 18.62 | 18.62 | 1.59 | 1.22 |
BX157 | – | – | – | 9 | 9 | 9 | 294.46 | 20.98 | 20.98 | 3.18 | 4.14 |
BX158 | – | – | – | 11 | 11 | 11 | 352.04 | 23.14 | 23.14 | 3.18 | 6.55 |
BX159 | – | – | – | 13 5/8 | 13 5/8 | 13 5/8 | 426.72 | 25.70 | 25.70 | 3.18 | 9.60 |
BX160 | – | – | 13 5/8 | – | – | – | 402.59 | 23.83 | 13.74 | 3.18 | 14.41 |
BX161 | – | – | 16 3/4 | – | – | – | 491.41 | 28.07 | 16.21 | 3.18 | 6.75 |
BX162 | – | – | 16 3/4 | 16 3/4 | 16 3/4 | – | 475.49 | 14.22 | 14.22 | 3.18 | – |
BX163 | – | – | 18 3/4 | – | – | – | 556.16 | 30.10 | 17.37 | 1.59 | – |
BX164 | – | – | – | 18 3/4 | 18 3/4 | – | 570.56 | 30.10 | 24.59 | 3.18 | – |
BX165 | – | – | 21 1/4 | – | – | – | 524.71 | 32.03 | 18.49 | 3.18 | – |
BX166 | – | – | – | 21 1/4 | – | – | 640.03 | 32.03 | 26.14 | 3.18 | – |
BX167 | 26 3/4 | – | – | – | – | – | 759.36 | 35.87 | 13.11 | 3.18 | – |
BX168 | – | 26 3/4 | – | – | – | – | 765.25 | 35.87 | 16.05 | 1.59 | – |
BX169 | – | – | – | 5 1/8 | – | – | 173.51 | 15.85 | 12.93 | 1.59 | – |
BX170 | – | – | – | 6 5/8 | 6 5/8 | – | 218.03 | 14.22 | 14.22 | 1.59 | – |
BX171 | – | – | – | 8 9/16 | 8 9/16 | – | 267.44 | 14.22 | 14.22 | 1.59 | – |
BX172 | – | – | – | 11 5/32 | 11 5/32 | – | 333.07 | 14.22 | 14.22 | 1.59 | – |
BX303 | 30 | 30 | – | – | – | – | 852.75 | 37.95 | 16.97 | 1.59 | – |
Inconel 825 RTJ gaskets are deployed across sectors that operate under high-pressure, high-temperature, and corrosive conditions. Primary applications include upstream oil and gas wellhead assemblies, petrochemical processing reactors and pipelines, and thermal power generation steam systems. The material’s corrosion resistance also supports use in marine engineering and chemical processing facilities handling acidic media. For commercial procurement teams sourcing components for critical service applications, these gaskets align with API 6A requirements for equipment used in hydrocarbon production and processing.
Proper installation is required to achieve intended sealing performance. BX style gaskets must only be installed into API 6BX flanges with matching ring number specifications. Before installation, inspect gasket sealing faces for scratches, dents, or foreign debris, as surface defects can cause leakage under pressure. The pressure equalization hole on BX gaskets must be aligned to allow pressure transfer across the gasket; blockage of this hole will prevent proper pressure equalization during system pressurization.
Gaskets should be stored in a clean, dry environment to prevent surface contamination or corrosion before use. Reuse of compressed ring joint gaskets is not recommended, as plastic deformation of the sealing faces during initial installation will reduce sealing effectiveness in subsequent use.
BX style ring joint gaskets are designed exclusively for use with API 6BX standard flanges. They cannot be installed into flanges built to R or RX style groove dimensions, as differences in gasket geometry will prevent proper compression and sealing.
Inconel 825 alloy provides resistance to sulfuric acid of moderate concentrations, chloride-induced stress corrosion cracking, and oxidizing atmospheres at temperatures up to 1000°F (538°C). It is also suitable for use in seawater and brine systems. Compatibility should be verified for specific chemical concentrations and temperature combinations before deployment.
No, BX style gaskets are not interchangeable with R or RX style ring joint gaskets. Each style has distinct dimensions, sealing face geometry, and pressure rating profiles. Using an incompatible gasket style will result in improper sealing and potential system failure under pressure.
