Comparative study of the behaviour of conventional gasketed and compact non-gasketed flanged pipe joints under bolt up and operating conditions

Abid, Мuhammad; Nash, David

doi:10.1016/j.ijpvp.2003.11.013

Cited by 45 publications

(48 citation statements)

References 4 publications

(5 reference statements)

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“…A second value of UY = −0.156 mm was applied to bolt's bottom surface, to achieve an initial pre-stress value of 474 MPa in the bolt (which is 74 per cent of the yield stress of the bolt material) although the recommended value is 80 per cent of the yield stress [3][4][5][6][7][8][9].…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…After pre-stress application, the design pressure of 15.3 MPa and proof test pressure of 23 MPa was applied separately for the two different cases. End-cap loading (21.48 and 32.29 MPa in design and proof test pressures, respectively, due to internal pressure) was applied to the end of the pipe, a suitable distance away from the joint [3][4][5][6][7][8][9].…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…In addition, they do not address the effect of any external loading on integrity and sealing performance. Non-gasketed flange joints are considered as an alternative to the 'static mode of load' under bolt-up and internal pressure applications, [3][4][5][6][7][8] and bolt-up and different temperature loading conditions [9,10] and its better joint strength and sealing capabilities. External loading on bolted flange joints have been discussed [11,12] but these studies are for gasketed flange joints and bending loading.…”

Section: Introductionmentioning

confidence: 99%

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Stamina of a Nongasketed Flange Joint Under Combined Internal Pressure, Axial, and Bending Loading: An Experimental Study

Abid

Nash

2009

Journal of Pressure Vessel Technology

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This version is available at https://strathprints.strath.ac.uk/16587/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Abstract: The performance of a bolted flange joint is characterized mainly by its 'strength' and 'sealing capability'. A number of numerical and experimental studies have been conducted to study these characteristics under internal pressure loading conditions alone. However, limited work is found in the literature under conditions of combined internal pressure and axial loading. The effect of external, axial loading pressure being unknown, the optimal performance of the bolted flange joint cannot be achieved. Current design codes do not address the effects of axial loading on structural integrity and sealing ability. To study joint strength and sealing capability under combined loading conditions, an extensive experimental and numerical study of a nongasketed flange joint was carried out. Actual joint load capacity was determined at both design and test stages with the maximum external axial loading that can be applied for safe joint performance. Experimental and numerical results have been compared and overall joint performance and behaviour is discussed in detail.

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Section: Boundary Conditionsmentioning

confidence: 99%

Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stamina of a Nongasketed Flange Joint Under Combined Internal Pressure, Axial, and Bending Loading: An Experimental Study

Abid

Nash

2009

Journal of Pressure Vessel Technology

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“…Molti studi presentano analisi agli Elementi Finiti (EF), utilizzando elementi di contatto (che comportano analisi di tipo non lineare) per determinare la distribuzione delle pressioni di contatto fra le due superfici della flangia [6][7][8][9][10][11][12][13][14][15][16][17][18], spesso offrendo soltanto analisi di carattere comparativo fra diverse configurazioni. Alcuni studi dimostrano l'effettiva importanza del sigillante [11].…”

Section: Introduzioneunclassified

“…Alcuni studi dimostrano l'effettiva importanza del sigillante [11]. La condizione di perdita è solitamente associata alla perdita di pressione di contatto fra le flange accoppiate [6][7][8][9][10] oppure al verificarsi di una tensione di trazione sufficiente a provocare il distacco fra il sigillante ed una delle due superfici della flangia [6]. L'effettivo valore del preserraggio imposto al bullone è ampiamente accettato come una delle principali cause di non affidabilità della flangia bullonata in termini di tenuta.…”

Section: Introduzioneunclassified

Modello di tenuta della flangia bullonata, senza guarnizione, mediante l’analogia della meccanica della frattura di una fessura parzialmente aperta

Beghini

Bertini

Santus

et al. 2010

Frattura Ed Integrità Strutturale

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RIASSUNTO. I compressori centrifughi di elevate dimensioni non permettono l'utilizzo di guarnizioni deformabili, per cui le due metà della flangia di connessione sono forzate mediante bullonatura e la tenuta è affidata al contatto completo delle due superfici. La previsione della pressione di perdita è un aspetto di progetto di notevole interesse per questa tecnologia. L'azione della pressione interna sollecita la separazione delle superfici della flangia, che invece è contrastata dall'azione di serraggio dei bulloni. Il presente lavoro propone un modello per prevedere la condizione di perdita, basato sulla meccanica della frattura. Dato che le due superfici della flangia sono semplicemente a contatto, esse costituiscono una vera e propria fessura parzialmente aperta. Come ben noto il fattore di intensificazione di una fessura parzialmente aperta è nullo. Imponendo che le due superfici siano parzialmente separate ad una distanza fino al bordo del foro del bullone (che offre un canale di fuoriuscita per il fluido in pressione), e imponendo la condizione di fattore di intensificazione nullo, è possibile determinare la pressione di perdita, analiticamente, mediante la tecnica delle "weight functions" (o "funzioni peso"). Il presente lavoro riporta una positiva validazione del modello proposto mediante sia simulazione numerica sia risultati sperimentali in piena scala e in scala ridotta. Il modello analitico proposto offre uno strumento di progetto di immediata implementazione per comparare diverse geometrie di flangia bullonata.ABSTRACT. The use of a gasket made in soft material is not recommended for large size centrifugal compressor case flanges. The two case halves are assembled with bolted flanges and the leakage is prevented by the "metalto-metal" contact of the flange surfaces. The prediction of the leakage condition is an important engineering challenge for this technology. A new model to predict the leakage condition, based on Fracture Mechanics, is here presented. The partially open flange surfaces interface can be regarded as a partially open crack. The Stress Intensity Factor of a partially open crack is zero, since the flange surfaces can not transfer tensile traction, being just in contact (not "glue" or "welded"). The extension of the open zone, i.e. the crack length, can be obtained imposing the zero Stress Intensity Factor condition. The leakage is expected as the flange surface open front reaches the bolt hole, that produces a way out path for the internal pressurized fluid. By means of the weight functions analytical technique, the leakage pressure can be calculated. The proposed model was then successfully validated by means of both numerical simulations and full scale and small scale experimental tests. The proposed analytical model can be used to compare different flange geometries and then it is a useful design tool. PAROLE CHIAVE. Tenuta. Flangia bullonata. Meccanica della frattura. Fessura parzialmente aperta.

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Determination of Safe Operating Conditions for Non-gasketed Flange Joint under Combined Internal Pressure and Temperature

Abid

2005

Int J Mech Mater Des

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Comparative study of the behaviour of conventional gasketed and compact non-gasketed flanged pipe joints under bolt up and operating conditions

Cited by 45 publications

References 4 publications

Stamina of a Nongasketed Flange Joint Under Combined Internal Pressure, Axial, and Bending Loading: An Experimental Study

Stamina of a Nongasketed Flange Joint Under Combined Internal Pressure, Axial, and Bending Loading: An Experimental Study

Modello di tenuta della flangia bullonata, senza guarnizione, mediante l’analogia della meccanica della frattura di una fessura parzialmente aperta

Determination of Safe Operating Conditions for Non-gasketed Flange Joint under Combined Internal Pressure and Temperature

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