An Anchor that is part of the expansion joint. The anchor base can be designed as a Main Anchor or
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An Anchor that resists movement in one or two axes only.
An anchor that is located between expansion joints such that pressure thrust loads are canceled. An
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A structure used to restrain pipe from movement in any direction. It is designed to resist all
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See DEFLECTION, ANGULAR.
The angular displacement of an expansion joint about the centerline of the bellows element. This
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The moment required per degree of angular displacement about the centerline of a single bellows
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An expansion joint manufactured to the ASME Section VIII Pressure Vessel Code or the ASME III
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A band of metal fused to the ID or OD of a bellows neck to increase the effective thickness of the
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A corrugated metal cylinder, the corrugated portion of a metal expansion joint assembly.
The straight segment of bellows tube that extends outward from the outboard convolutions. A bellows
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Refers to the pipe spool that separates the two bellows elements in a double or dual expansion joint
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See PRESET.
A band of metal used to reinforce the neck portion of a bellows to reduce the hoop stress on the
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Any device that compensates for movement of adjacent piping.
The length of the convoluted portion of a bellows element as measured from the root tangent of the
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A bellows element is made up of a series of annular bumps each of which is a convolution. A typical
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The curved portion of a convolution located at the outside diameter of the bellows element.
The curved portion of a convolution located at the inside diameter of the bellows element.
A rectangular corner configuration in which the corrugation crests are attached to the corrugation
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A rectangular corner configuration in which the adjacent corrugated rails are joined with a 45
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A rectangular corner configuration in which the adjacent corrugated rails are joined with a round
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A protective shroud that covers the outside surface of a bellows used to protect the bellows from
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The number of combined displacement and pressure cycles that a bellows can withstand for a given
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Rotation about the center of a bellows element, the type of deflection that would occur if the
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The compression or extension of an expansion joint along the axial centerline. Units are generally
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The offset of an expansion joint in the direction perpendicular to the longitudinal centerline,
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See PRESSURE, DESIGN.
Two expansion joints separated by a center spool that contains an intermediate anchor. The Senior
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The area of the bellows defined by the Mean Diameter of the convolutions. Typical units are
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See EXPANSION JOINT MANUFACTURER’S ASSOCIATION.
Often referenced by the acronym EJMA, a trade association consisting of a grouping of the leading
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A leak tight assembly of bellows elements and fittings designed to absorb imposed movements.
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Refers to an expansion joint style that is designed to have the media pressure external to the
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See CYCLE LIFE.
Flanged connection made from structural angle or as a fabricated section. Can be used with round or
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A rotatable flange. See FLANGE, LAP JOINT or FLANGE, VANSTONED.
Flange connection made from forged steel or forged alloy material faced and drilled to match
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Flange connection consisting of a fabricated pipe fitting (lap joint stub end) and rotatable backing
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Flange connection made from plate material and drilled to match specified flange standard. The
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Generally refers to a forged flange with dimensions in accordance with ANSI B16.5 standards. A
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Flange connection that is made by flaring the bellows material over the face of the flange. The
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Generally refers to a forged flange with dimensions in accordance with ANSI B16.5 standards. A weld
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The direction of flow of the fluid through and expansion joint. It is important to specify flow
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Gimbal expansion joints absorb angular movement in any plane. The construction is similar to the
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A pipe guide used to maintain axial alignment by resisting all non-axial movement of pipe.
Refers to an expansion joint style that incorporates internal hardware that acts as an axial pipe
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Any type of guide that directs pipe to move in a specific direction. See GUIDE, AXIAL.
A pipe guide that allows movement in a single plane.
Hinged expansion joints permit angular motion in one plane. The hinges are designed to contain the
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An abbreviation for Heating Ventilation and Air Conditioning.
A special type of pressure balanced expansion joint that eliminates pressure thrust but does not
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See LINER, SINGLE or LINER, TELESCOPING.
See DEFLECTION, LATERAL.
High media velocity against the bellows can result in harmonic vibration of the bellows element
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A telescopic flow liner consists of two overlapping internal sleeves used to isolate a bellows from
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The corrugated length of a single bellows element as measured from the root to root of the outboard
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The average diameter of the bellows element calculated by adding the bellows inside diameter plus
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An arrow and scale device that visually displays the movement of an expansion joint from the
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Bellows elements made from two or more tubes that have been telescoped together prior to forming of
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Refers to the rounded dimension in Inches that is most closely associated with a given pipe size.
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In process manufacturing tests that might include dye penetrant examination of welds, radiography of
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An expansion joint that uses a packing material to seal against the media. Packed expansion joints
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Metal bellows type expansion joint.
A double diamond shaped truss that is used with a universal expansion joint to equalize individual
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The length of a single convolution in a bellows element or (live length)/(number of convolutions)
Refers to one layer of material used to make up a metal bellows element. Most bellows are single
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A special type of multiple ply bellows in which each ply is designed to accommodate 100% of the
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Lateral, axial or angular deflection applied to a finished expansion joint, also known as Cold
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See PRESSURE BALANCED EXPANSION JOINT.
A specialized expansion joint assembly that incorporates a flow bellows element and a balancing
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An expansion joint can be modeled as a hydraulic cylinder with a spring inside. The spring
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The customer specified pressure (must be combined with Design Temperature) that is used to design
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If an expansion joint is applied in a situation wherein the assembly is exposed to external
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Most expansion joints are internally pressurized in service and it is assumed that the design
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The pressure at which an expansion joint is intended to operate in service. Generally, the design
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All internally pressurized bellows will become unstable at some pressure, similar to a column under
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See PRESSURE, SQUIRM.
For the purpose of this web site, the pressure at which an expansion joint is to be pressure tested
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A metal expansion joint with limit rods or hose assembly used to isolate pumps or compressors from
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A port or ports located between the upstream end of a bellows element and the liner attachment.
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Refers to a bellows element that includes external reinforcing rings to increase the bellows
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A Tee shaped reinforcing ring that limits the axial compression of each convolution to the gap that
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Rings that are installed between convolutions to reinforce the bellows element. The ring material
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Rods (usually threaded) fixed to plates or lugs on adjacent ends of an expansion joint and used to
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Rods (usually threaded) fixed to plates or lugs on adjacent ends of an expansion joint and used to
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Rods (usually threaded) fixed to plates or lugs on adjacent ends of an expansion joint and generally
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Also called shipping bars, shipping restraints are welded or bolted connections that fix the overall
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See COVER.
An expansion joint with one bellows element.
A single or universal expansion joint with slotted hinge hardware bridging the bellows element(s).
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General reference to the spring constant of a metal bellows or expansion joint assembly. See SPRING
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The moment per unit of deflection required to rotate an expansion joint about the center of a
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The force per unit of deflection required to compress or extend a bellows or expansion joint along
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The initial force per unit of measure required to deflect a bellows or expansion joint assembly.
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The force per unit of deflection required to offset of an expansion joint in the direction
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The moment per degree of rotation to deflect a bellows about the axial center line. Axial torsion
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The average force per unit of measure required to deflect a bellows or expansion joint assembly.
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Refers to an overlapping or telescoping end connection that is joined by soldering or brazing.
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See BELLOWS NECK.
See RODS, TIE.
Refers to a reinforced bellows with circular convolutions in lieu of more typical “U” shaped
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An axial moment applied to a bellows causing a shear stress in the bellows membrane. Torque should
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See TORQUE.
A universal expansion joint consists of two bellows elements separated by a center spool. The
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Refers to a bellows that does not have any external reinforcement. Most bellows are of this design.
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Also known as disc welded bellows. Refers to a bellows made from profiled disks that are welded ID
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The brand name for an externally pressurized expansion joints manufactured by Senior Flexonics
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