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Spiroflex d.o.o.
Ljudevita Gaja 7
35 208 Ruščica
Croatia

 

Phone: +385 35 _212420
Telefax: +385 35 _457105
e-mail: info@spiroflex.hr

 

Metal expansion joints

Product Range

Axial expansion joints

Axial expansion joints are designed to accept movements of extension and compression in the axis direction. The length of expansion joint in neutral position is called free length. The longest service life is achieved by exploiting the axial shift in both directions as extension (+Δax) and compression (-Δax). When it is known that movement will be in one direction, to utilize the complete all available movement we propose to install expansion joint under “prestress”. The expansion joint service life depends on correct installation.

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ASP - Axial expansion joint with weld ends<br /><br />

Typ: ASP

Axial expansion joint with weld ends

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ASET - Axial expansion joint with external thread nipples

Typ: ASET

Axial expansion joint with external thread nipples

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ASIT - Axial expansion joint with internal thread nipples

Typ: ASIT

Axial expansion joint with internal thread nipples

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ASF - Axial expansion joint with fix flanges

Typ: ASF

Axial expansion joint with fix flanges

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ASLF - Axial expansion joint with loose flanges

Typ: ASLF

Axial expansion joint with loose flanges

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Universal expansion joint

Universal expansion joint consists of two bellows connected with intermediate pipe. This expansion joint installed in exhaust systems absorbs axial and lateral heat expansions, vibrations and pressure movements. Universal expansion joints are unrestrained and they have applications in low pressure systems.

UBP - Universal expansion joint with pipe ends and intermediate pipe

Typ: UBP

Universal expansion joint with pipe ends and intermediate pipe

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UBF - Universal expansion joint with flanges and intermediate pipe

Typ: UBF

Universal expansion joint with flanges and intermediate pipe

Catalog

Tied single expansion joint

This type of expansion joint is used for reducing tension, vibrations, stress and oscillation on pipelines of pumps, motors, compressors, turbines, burners and engines. It accepts small inaccuracies between aggregates and other equipment or pipeline. The tied bars are carried on flanges by spherical washers and they absorb pressure thrust.

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STP - Tied single expansion joint with pipe ends

Typ: STP

Tied single expansion joint with pipe ends

 
STF - Tied single expansion joint with flanges

Typ: STF

Tied single expansion joint with flanges

Catalog

Tied double expansion joint

This type of expansion joint can accept large movements in the lateral plane and can operate in all directions. Expansion joints with two tied bars can accommodate angular movement of flanges. The restraints absorb axial reaction force produced by internal pressure. The lateral movement depends on length of intermediate pipe. The tied bars are connected to the flanges through spherical washers.

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TDP - Tied double expansion joint with pipe ends

Typ: TDP

Tied double expansion joint with pipe ends

 
TDF - Tied double expansion joint with flanges

Typ: TDF

Tied double expansion joint with flanges

Hinged expansion joints

Hinged single expansion joint consists of metal bellows, flanges or pipe ends and restraint system with axis of rotation. Hinged expansion joint can only accept angular movement. The pressure load produced by internal pressure is contained by hinged parts and it is not necessary to install strong fix points and robust guiding in piping system. The pair of hinged expansion joints is convenient for pipeline with long movements.

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HSP - Hinged expansion joint with pipe ends

Typ: HSP

Hinged expansion joint with pipe ends

 
HSF - Hinged expansion joint with flanges

Typ: HSF

Hinged expansion joint with flanges

Double hinged expansion joint

Double hinged expansion joint consists of two single hinged expansion joints connected with intermediate pipe and welded bars with double hinge restraints to absorb pressure thrust, axial force due to the effect of pressure. Application of this expansion joint is for compensating large lateral movement.

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HDP - Double hinged expansion joint with pipe ends

Typ: HDP

Double hinged expansion joint with pipe ends

 
HDF - Double hinged expansion joint with flanges

Typ: HDF

Double hinged expansion joint with flanges

Gimbal expansion joint

Gimbal expansion joints are designed to accept angular movement in any plane. Four hinge restraints are welded on flanges and connected on common gimbal ring. Gimbal expansion joints are usually used in pairs or in system of one pair of gimbal expansion joints plus one hinged expansion joint.

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GSP - Gimbal expansion joint with pipe ends

Typ: GSP

Gimbal expansion joint with pipe ends

 
GSF - Gimbal expansion joint with flanges

Typ: GSF

Gimbal expansion joint with flanges

Pressure balanced expansion joints

Pressure balanced assembly is designed to absorb the force due to the internal pressure. Only the low spring forces due to the bellows deflection are transferred to fix points.
Pressure balanced elbow expansion joint is designed to accept axial and lateral movements of pipeline or equipment.
This type of expansion joint is usually used as connection on flanges of turbines, pumps or compressors where minimum forces and moments are required. Furthermore where the space to install anchor has limitation. In-line pressure balanced expansion joint is designed to accept axial and lateral movements. This type of expansion joint is used between sensitive equipment where low forces and movements are required.

The balancing bellows (“big”) has the effective area twice that of the line bellows (“small”).
These forces cause acting across the tie rods attached to the tie flanges.

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PBL - Pressure balanced expansion joint for in-line installation

Typ: PBL

Pressure balanced expansion joint for in-line installation

 
PBE - Pressure balanced expansion joint for elbow installation

Typ: PBE

Pressure balanced expansion joint for elbow installation

Bellows dismantling joint

In the pipeline with high pressure and larger sizes with strong anchors at the end of straight section for mounting or demounting of valves or similar devices installing of bellows dismantling joints is recommended. The expansion joints are equipped with restrained screws which bridge convoluted part of expansion joint and absorb the pressure thrust force. Furthermore they are equipped with compression screws. They compress the bellows in the moment of fitting or removing valves or similar equipment.

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MDK-A - Bellows dismantling joint

Typ: MDK-A

Bellows dismantling joint

Catalog
 
MDK-B - Bellows dismantling joint

Typ: MDK-B

Bellows dismantling joint

Catalog