Joining, flanges and sealing
Gaskets and sealing systems
A gasket must match flange facing, class, fluid, temperature, thermal cycling and bolt load; nominal size alone is insufficient.
Type and construction
Available types
Quick comparison
How the main types differ in selection
TypePurposeBest suited toWatchpoint
Non-metallic flat gasketSealing a flanged joint at design pressure and temperatureDetachable joints with defined facing and bolt loadChemical compatibility, temperature, facing, compression and reuse prohibition
Spiral-wound gasketSealing a flanged joint at design pressure and temperatureDetachable joints with defined facing and bolt loadChemical compatibility, temperature, facing, compression and reuse prohibition
Jacketed gasketSealing a flanged joint at design pressure and temperatureDetachable joints with defined facing and bolt loadChemical compatibility, temperature, facing, compression and reuse prohibition
Camprofile gasketSealing a flanged joint at design pressure and temperatureDetachable joints with defined facing and bolt loadChemical compatibility, temperature, facing, compression and reuse prohibition
R-type ring jointSealing a flanged joint at design pressure and temperatureDetachable joints with defined facing and bolt loadChemical compatibility, temperature, facing, compression and reuse prohibition
RX ring jointSealing a flanged joint at design pressure and temperatureDetachable joints with defined facing and bolt loadChemical compatibility, temperature, facing, compression and reuse prohibition
BX ring jointSealing a flanged joint at design pressure and temperatureDetachable joints with defined facing and bolt loadChemical compatibility, temperature, facing, compression and reuse prohibition
Flange insulation kitCreating a detachable joint between piping, valves and equipmentLocations requiring assembly, inspection or periodic maintenanceStandard, class, material group, facing, gasket and bolting
Graphite packingSealing a flanged joint at design pressure and temperatureDetachable joints with defined facing and bolt loadChemical compatibility, temperature, facing, compression and reuse prohibition
PTFE packingSealing a flanged joint at design pressure and temperatureDetachable joints with defined facing and bolt loadChemical compatibility, temperature, facing, compression and reuse prohibition
Before selection
Information to define
- 1Flange facing
- 2Class and size
- 3Temperature and fluid
- 4Filler and ring material
- 5Bolt load
- 6Thermal cycling
Typical materials
GraphitePTFECompressed fibreStainless steelNickel alloy
Typical connections
Raised faceFlat faceRing-type joint
Typical media
ProcessSteamGasChemicals
Function
What does this family do?
Technical reference
Related standards
The exact edition and requirements must be checked against the project specification.
ASME B16.20ASME B16.21API 6A
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Related families
Engineering note
This page supports initial screening and does not replace engineering calculations, project specifications, manufacturer approval or design pressure-temperature checks.
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