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- Adhesion - Sticking of the gasket material to either or both flanges of a mechanical assembly.
- Adhesive - A compound that adheres or bonds two items togeather.
- Antistick - A coating or surface treatment that prevents the gasket material from adhearing to the flange.
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- Barlow's Formula - Relates to burst pressure, the point just before or at when a pipe or tubing fails under pressure.
- Binder - The elastomer or rubber used in gasket material.
- Blowout - Occures when internal pressure tends to push the gasket material out from between flanges.
- Bolt Fracture - A type of fastener failure that occures when a fastener is over-tightened and causes the bolt to break.
- Bolt Hole Distortion - The flange is permanently distorted directly beneath the bolt. Caused by initial bolt torque.
- Bolt Load - The load generated by a bolt when it is tightened.
- Bolt Tightening Procedure - When tightening, always use the correct sequential bolt order for the flange.
- Bolt Torque - A rotational moment. It is a measure of how much twisting is applied to tighten (turn) the nut on a bolt.
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- Cocking - When the flange of a mechanical assembly is not parallel to each other.
- Cold Flow - The continued deformation under stress.
- Compressibility - The state of being compressed. For a gasket, it is the percent loss of thickness when subjected to a given load.
- Compression Set - The residual deformation of a material after removal of the compressive stress.
- Cork - A gasket material manufactured from from the cork tree. Corke material is typically combined with rubbers to give it greater resistance to chemicals and solvents.
- Creep - Deformation with time when a part is subjected to constant stress. Metals creep can occur at elevated temperature however with gasket materials it can occur at normal ambient temperatures.
- Corrosion Resistance - The ability of a material to resist chemical destruction from an environment.
- Creep Relaxation - A transient stress strain condition in which the strain increases concurrently with the decay of stress.
- Crush Resistance - A measure of a gasket's ability to resist initial bolt load and /or extreme stress generated by the expansion of a bolted assembly upon heating.
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- Deformation - Is measured by how much an object is deformed from its origional dimensions.
- Density - The ratio of the amount of matter in an object compared to its volume.
- Ductility - The ability of the material to deform before it fractures.
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- Elastic Limit - The limiting extent to which a object my be deformed and yet return to its initial shape after removal of the deforming force.
- Elongation - The increase in length expressed numerically as a fraction or percentage of the initial length.
- Expansion - The increase in any linear dimension or volume.
- Extrusion - Permanent displacement of part of a gasket into a gap, under the action of fluid or bolting pressure.
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- Gasket Extrusion - The tendency of a gasket to flow from between flanges, particularly around bolt holes where stresses are concentrated.
- Graphite - A gasket material commonly used with steam.
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- Initial Flange Pressure - The stress on a gasket attained when a joint is initially tightened.
- Isolation Gasket - Used to stop the current flow across metallic pipelines by separating two flanges.
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- Permeability - The quality or condition of allowing passage of media through a material.
- Pipe Flange - A bolted connection where two pieces of pipe, equipment, fittings or valves are connected together to form a piping system.
- Preload - A load that sufficiently stretches the bolt / screw to give a tight joint and overcome any forces tending to pull the joint apart.
- Pressure - The force exerted perpendicular to the surface of an object and is expressed as force per unit area.
- Proof Load - The amount of stress that the fastener can withstand without experiencing deformation.
- PTFE - A plastic used for making gaskets. PTFE isd extremely chemically inert, and as such is resistant to chemicals and corrosives. PTFE also has a low co-efficient friction.
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- Raised Face Flange - The most common type of flange facing is the raised face flange. It is used in almost all applications in high and low pressures and temperatures.
- Rubber - A material that is capable of recovering from large deformations quickly and forcibaly.
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- Seal - Any device designed to prevent or control the movement of fluid from one chamber to another to exclude contaminants.
- Sealing Stress - The amount of flange pressure in a flanged joint assembly to compress and seat a gasket material in order to create an effective seal.
- Shear Strain - Opposing forces acting parrallel to the cross-section of a body.
- Shear Stress - Tends to deform the material by breaking rather than stretching without changing the volume by restraining the object.
- Spiral Wound Gasket -
- Strain - The deformation, stretched or compressed, of a material compared to its original length.
- Stress - The force per unit area of cross-section.
- Swelling - The increase volume or linear dimension of a specimen immersed in liquid or exposed to vapor.
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- Warp - The lengthwise yarns in a woven fabric.
- Weathering - The surface deformation of a rubber object during outdoor exposure, such as cracking, crazing or chalking.
- Wicking - Leakage through a gasket.
- Working Pressure - The normal pressure that a system operates at.
Tags:
Gasket
Glossary
