Gasket characteristics for the design of bolted flange connections of metal-to-metal contact type

Roos, Eberhard; Kockelmann, H.; Hahn, Rolf

doi:10.1016/s0308-0161(01)00127-2

Cited by 21 publications

(10 citation statements)

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“…The stress relaxation properties of the gasket are usually described by stress relaxation rate (g) and stress relaxation factor (P QR ). The two factors can be calculated according to equations (2) and (3). The results are shown in Table 5.…”

Section: Resilience Ration ¼ Amount Of Resilience Amount Of Compressionmentioning

confidence: 99%

“…The structure features, sealing mechanism, and advantages of MMC type flange joints can be found in various literatures. [1][2][3][4][5] BS EN 1591-1 6 stipulates the design method based on leakage for floating type flange joints, and the gasket parameters used in BS EN 1591-1 are given in BS EN 1591-2. 7 The corresponding test methods are presented in EN13555.…”

Section: Introductionmentioning

confidence: 99%

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Study on the gasket parameters and the calculation of MMC flange joint according to XP CEN\TS 1591-3

Zhang

Sun

Ren-liang

2016

Proceedings of the Institution of Mechanical Engineers, Part E:

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Metal-to-metal contact type flange joints (bolted flange joint with metal-to-metal contact) have a constant gasket sealing stress during service, so it is extensively used for ''zero leakage'' design in petrochemical, chemical, or nuclear power industry. XP CEN\TS 1591-3 provides a calculation method for metal-to-metal contact flange joints but the gasket parameters needed in this calculation and their test methods are not given. To determine the gasket parameters of metal-to-metal contact type flange joints, the procedures of the compression-resilience test, the stress relaxation test, and the sealing test at different temperature were described here, and the main mechanical properties and sealing property of a metal-to-metal contact type gasket were obtained from these tests. The methods to determine the metalto-metal contact gasket parameters were introduced. And then, the calculation for a DN80 PN5.0 metal-to-metal contact type flange joint was carried out with two methods, one was the method according to XP CEN\TS 1591-3, the other was finite element method. In these calculations, the assembly condition and service condition were considered. The results of the two methods coincided well. This showed the test methods and test results of metal-to-metal contact type gasket parameters suggested here were available. So, they could be applied for the calculation of metal-tometal contact type flange joints.

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Section: Resilience Ration ¼ Amount Of Resilience Amount Of Compressionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the gasket parameters and the calculation of MMC flange joint according to XP CEN\TS 1591-3

Zhang

Sun

Ren-liang

2016

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…This flange is usually called gasketless, or metal-to-metal, and the leakage of the pressurized fluid inside the vessel is prevented by the bolt preload. Bolted flanges have been widely investigated, however most studies are limited to the compact geometry design for connecting pipes [2][3][4][5][6][7][8][9][10][11][12][13], while others are dedicated to the deformation behavior of the gasket [14][15][16][17][18][19][20]. Research on flanges is usually focused on the structural stiffness, stress distributions, and the strength optimization of the flange parts, under bolt preload and internal pressure or other external loadings [2,3,[6][7][8][9][10][11][12]18,[21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Partially open crack model for leakage pressure analysis of bolted metal-to-metal flange

Beghini

Bertini

Santus

et al. 2015

Engineering Fracture Mechanics

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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].…”

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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Gasket characteristics for the design of bolted flange connections of metal-to-metal contact type

Cited by 21 publications

References 0 publications

Study on the gasket parameters and the calculation of MMC flange joint according to XP CEN\TS 1591-3

Study on the gasket parameters and the calculation of MMC flange joint according to XP CEN\TS 1591-3

Partially open crack model for leakage pressure analysis of bolted metal-to-metal flange

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

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