expansion joints 2008 - dynaflow research group · pdf file“bellows expansion joints are...
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![Page 1: EXPANSION JOINTS 2008 - Dynaflow Research Group · PDF file“Bellows expansion joints are allowed to be used only if there is no reasonable alternative for accommodating displacements](https://reader030.vdocument.in/reader030/viewer/2022020315/5ab312437f8b9aea528dea9c/html5/thumbnails/1.jpg)
EXPANSION JOINTS
HANWEL B.V.
Harry Sueters
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What are expansion joints?
Expansion jointsCompensatorsPipe connectors
Hoses
Flexible piping partsthat are stable enough to
avoid buckling.
“long expansion joints”
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Application of expansion joints
Temperature elongationAvoiding pipe stress
Ground movement
Vibrations
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Application of expansion joints
Temperature elongation
Ground movementAvoiding pipe damage
Vibrations
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Application of expansion joints
Temperature elongation
Ground movement
VibrationsProtect pipes and equipment.Reduce sound level.
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Why use expansion joints?DSM engineering practices for expansion joints:
“Bellows expansion joints are allowed to be used only if there is no reasonable alternative for accommodating displacements”
Why not?:- Engineering problems- Weak member in the system- Too little knowledge
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Why use expansion joints?Alternatives:
- Bends
- Loops
- Stronger materials
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Why use expansion joints?Advantages of using expansion joints:- Less pipe and space needed.
(less supports)
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Why use expansion joints?Advantages of using expansion joints:- Stress can be reduced, relieving the pipe and connected equipment.
DN 15010 barg-10 / +200°C2000 cyclesPipe: St 35.8Pipe length: 10 m
Stress: 564 N/mm2
Allowable stress: 196 N/mm2
Force: F= 1306 kN
Force: F= 27,3 kN
ΔL = 27 mm
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Why use expansion joints?Advantages of using expansion joints:- Less pipe and space needed.- Stress can be reduced, relieving the pipe and connected
equipment.- In case of malfunctioning or operational errors the expansion joint
probably will be damaged, saving more expensive equipment.
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Types of expansion joints
unlimited
DN 500
DN 3600
DN 10.000rectangular
range
tailor made0,3 bargup to 1100°CGasFabric
standard10 barglow pressure
up to 200°CFluidGas
PTFE
standard25 barg16 barg
up to 110°Cup to 90°C
FluidGas
Rubber
tailor made100 bargup to 1100°CFluidGas
Stainlesssteel
standard or tailor made
pressuretemperaturemediumType
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Types of expansion joints
Selection case.
DN 200, Flanged PN 10Cooling water
max. 60°Cmax. 6 bargmovement:axial: 20 mm
Gas onlyFluidPN 1001100°C
FluidPN 10200°C
FluidPN 1690°C
Possibilities
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Types of expansion joints
Special attention:Life cycle is mainly influenced by the temperature.Up to 60°C – 25 to 30 yearsUp to 90°C – approx. 10 yearsUp to 110°C – approx. 5 Years
Old and worn-out expansion joints can burst.
Excellent chemical resistance.No fatigue due to vibrations or life cycles.Elastic material, extra safety.Excellent wear resistance.Excellent sound reduction.
Rubber
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Types of expansion joints
Special attention:Vacuum condition is not always possible.Low pressure resistance decreasing at higher temperatures
Old and worn-out expansion joints can burst.
Excellent chemical resistance.No fatigue due to vibrations or life cycles.Good sound reduction.Relative high temperatures possible.
PTFE
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Types of expansion joints
Special attention:Fatigue due to vibrations or life cycles.More critical with respect to correct installation.Corrosion (Pit corrosion)
Chemical resistance depending of the chosen material.High temperature possible.High pressure possible.Unlimited number of variations and sizes possible.Multiply bellows will normally not burst. (but start to leak)
Stainless steel
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Types of expansion joints
Special attention:Only for gas. (dew point and cleaning)For low pressure onlyHeating from out side.
Chemical resistance depending of the chosen material.High temperature possible.Large number of variations and sizes possible.Low spring forces
Fabric
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Types of expansion joints
Axial movement per convolution.
Lateral and angular movement of a bellow
Stainless steel
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Types of expansion joints
Medium MaterialTemperature and pressure Material thicknessMovements Type, No. convolutions, No. layers
Stainless steel, selection criteria
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Types of expansion joints
The principle of multi ply bellows.
2 plies:σ = ½ σ single plyF = ¼ F single ply
Stainless steel
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Forces
Fr = NReaction force: Fr = A x p x 10 A = cm3
p = barg
Reaction force
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Forces
Reaction force – unrestraint jointsSpring force
Reaction force Fr Friction force – tie-rods, hinges
Flat Flat + Ffric
Unrestraint Restraint
Forces
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Forces
Forces on fixed pointFr: 861 kNFax: 30 x 0,3: 9 kNF: 870 kN
Flat: 90 x 0,2: 18 kNFfric: 4 kNF: 24 kN
Example: DN 1000, 10 barg, ΔL: 90 mm
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Fr Fax: 623 kN (Freaction + Faxial) Flat: 45 kN
Fax: axial movement not possibleFlat: 82 kN (45 kN + 37 kN)
Fax: axial movement not possibleFlat: 13 kN (7 kN + 6 kN)
Rubber joint DN 1200, 5 barg, axial: 5 mm, lateral: 15 mm, EL= 1745, BL= 4486 mm
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Fax: 16 kN (8 kN per bellow) Flat: 10 kN (7 kN + 3 kN)
Pressure balanced system
Single expansion joint:Fax: 623 kNFlat: 45 kN
Rubber joint DN 1200, 5 barg, axial: 5 mm, lateral: 15 mm, EL= 1745, BL= 4486 mm
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Questions
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Het Gebruik van BellowsRotterdam, 11-12-2008
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Installatie van Expansion Bellows
“Correct ontworpen en geïnstalleerde Bellows werken vele jaren zonder problemen”
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Waardoor Kunnen Bellows Falen?
Schade kan ontstaan tijdens: vervoer, opslag en installatie
Deuken, krassen ect. kunnen worden veroorzaakt door vorkheftrucks, kettingen enz.
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Ontwerpfouten
Ontwerpfouten:
Er is onvoldoende bescherming door guides en ankers
Er wordt niet binnen de opgegeven waarden van de fabrikant gebleven
Bellow wordt toegepast bij zeer gevaarlijke stoffen
Bellow is niet bestand tegen procescondities of het medium
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Installatiefouten
Fouten tijdens de installatie:
Binnenpijp staat niet in de stromingsrichting
Het scharnier staat in de verkeerde stand
Er is niet volgens tekening geïnstalleerd (verkeerde plaats)
Transport bescherming wordt voortijdig verwijderd (Hierdoor niet in correcte uitgangspositie)
Er is schade ontstaan door het lassen of slijpen in de omgeving
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Falen tijdens Bedrijf of Watertest
Falen van de Bellow tijdens bedrijf of watertest:
Overbelasting
Trillingen
In- en uitwendige corrosie
Te grote bewegingen
Erosie
Vervuiling
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Geen Axiale Bescherming
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Flixborough Incident June 1974 (1)
“They did not know that they did not know!”
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Flixborough Incident June 1974 (2)
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Simulaties van het bezwijk-mechanisme van de Bellows
Flixborough Incident June 1974 (3)
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Flixborough Incident June 1974 (4)
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Slechte Uitlijning van Bellows
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Bellows in Cryogenic Piping (1)
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Bellows in Cryogenic Piping (2)
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Crack in de isolatie
Bellows in Cryogenic Piping (3)
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Anker in een VapourReturn Pipe
Bellows in Cryogenic Piping (4)
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Defecte Bellows door gewijzigde procescondities
Verandering van Procescondities (1)
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Lekkende Bellows in DN 450 MD stoomleiding
Verandering van Procescondities (2)
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Corrosie door zoutin Bellows
Verandering van Procescondities (3)
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Foutief Onderhoud van een Stoomsysteem
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Tankzetting compenseren d.m.v. Bellows
Tankzettingen
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Hartelijk dankvoor uw aandacht
Vragen ?