Failure analysis of the conical gaskets in ultra-high pressure pipeline sealing devices: Experiment and numerical simulation

Xin-liang, Dong; Zhong, Fan; Jiang, Wenchun; Xie, Yue; Zhang, Yipeng; Xie, Xuefang; Zhai, Xiangnan; Chang-cun, Lu; Li, Guohua; Xiu-hui, Jiang

doi:10.1016/j.engfailanal.2021.105946

Cited by 8 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, O-rings can be treated as viscoelastic material and are subject to stress relaxation in long-term service, which may change their properties. Moreover, different operating conditions for energy equipment can accelerate the relaxation effect of O-rings [15,16], leading to a decrease in sealing performance [17]. Leakage rate is an important indicator for the quantitative evaluation of O-ring sealing performance, and many energy devices have strict leakage-rate limits.…”

Section: Introductionmentioning

confidence: 99%

Long-term sealing performance evaluation and service life prediction of O-rings under thermal–mechanical coupling conditions

Li,

Zhang,

Fang

et al. 2024

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

In service, thermal-mechanical coupling conditions can exacerbate stress relaxation of O-rings and lead to their thermal expansion, further complicating the sealing problem. A finite element method is developed to simulate the mechanical deformation behavior of O-rings under thermal-mechanical coupling conditions, and its validity is verified by comparison with experimental data. Based on a substantial amount of simulation data, it is found that a dimensionless contact stress can be used as an indicator of the degradation of sealing performance and can be related to temperature T and time τ in the form of an aging kinetic equation. By combining this equation with the existing interfacial leakage model, an approach of predicting the long-term leakage rate of O-rings is proposed to quantitatively evaluate the effect of various factors on the performance of O-rings, and some important conclusions are drawn. Regarding the effect of temperature on O-rings, the thermal expansion effect dominates when the service time is less than 20 days, and the stress relaxation effect prevails when it is greater than 20 days. The higher the temperature, the more significant the stress relaxation, and the faster the leakage rate of O-rings. Increasing the fluid pressure enhances the relaxation effect. Using the maximum allowable leakage rate as the failure criterion, a pressure-temperature curve is plotted representing the safety boundaries, which can be used to guide the design of the sealing structures. Furthermore, an exhaustive study on the service life evaluation shows that at high temperature (T ≥ 120 ℃), the service life curves show a plunging segment near a pressure rise to 0.42 MPa.

show abstract

Section: Introductionmentioning

confidence: 99%

Long-term sealing performance evaluation and service life prediction of O-rings under thermal–mechanical coupling conditions

Li,

Zhang,

Fang

et al. 2024

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…Bolted flanged connections are widely used in industry, agriculture and national defense construction, and the main failure type is leakage (Dong et al , 2022; Nam et al , 2022; Mourya et al , 2015; Marek et al , 2022; Jaszak, 2021; Cao et al , 2021). The gasket is the core component of the bolted flanged connections.…”

Section: Introductionmentioning

confidence: 99%

Study on life distribution and prediction method of flexible graphite composite reinforced gasket

Zhang,

Shao,

Kong

et al. 2023

ILT

View full text Add to dashboard Cite

Purpose This paper aims to prevent gasket sealing failure in engineering, accurately predict gasket life, extend system life and improve sealing reliability. The accelerated life test method of flexible graphite composite–reinforced gaskets is established, the life distribution law of flexible graphite composite–reinforced gaskets is revealed, and the life prediction method of flexible graphite composite–reinforced gaskets with different allowable leakage rates is proposed, which can provide a reference for the life prediction of other types of gaskets. Design/methodology/approach In this study, flexible graphite composite–reinforced gaskets were tested for long-term high-temperature sealing performance on a multi-sample gasket accelerated life test rig. The data were also analyzed using the least squares method and the K-S hypothesis calibration method. A gasket time-dependent leakage model and an accelerated life model were also developed. Constant stress-accelerated life tests were conducted on flexible graphite composite–reinforced gaskets. On this basis, a gasket life prediction method at different allowable leakage rates was proposed. Findings The life distribution law of flexible graphite composite–reinforced gaskets is revealed. The results show that the life of the gasket obeys the Weibull distribution. The time-correlated leakage model and accelerated life model of the gasket were established. And the accelerated life test method of the flexible graphite composite–reinforced gasket was established. The life distribution parameters, accelerated life model parameters and life estimates of gaskets were obtained through tests. On this basis, a gasket life prediction method under different leakage rates was proposed, which can be used as a reference for other types of gaskets. Practical implications The research in this paper can better provide guidance for the use and replacement of gaskets in the project, which is also very meaningful for predicting the leakage condition of gaskets in the bolted flange connection system and taking corresponding control measures to reduce energy waste and pollution and ensure the safe operation of industrial equipment. Originality/value A multi-specimen gasket-accelerated life test device has been developed, and the design parameters of the device have reached the international advanced level. The life distribution law of the flexible graphite composite–reinforced gasket was revealed. The accelerated life test method for the flexible graphite composite–reinforced gasket was established. The life prediction method of the flexible graphite composite–reinforced gasket under different allowable leakage rates was proposed. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2023-0254/

show abstract

“…A compressibility and recovery test is a method for measuring the behavior of gasket materials under a short compressive loading time at room temperature. During the compression recovery test, the uneven load applied on the gasket will cause the gasket material to deform too quickly and lead to material failure [1]. At present, some scholars have applied finite element analysis on gaskets and obtained the relationship between gasket stress, bolt section stress, and flange deflection angle; that is, the larger the flange deflection angle is, the more uneven the gasket stress is, and the more likely seal failure occurs in the bolted flange joints [2].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Gasket Surface Contact Stress Uniformity Based on Gray-Level Co-Occurrence Matrix

et al. 2022

View full text Add to dashboard Cite

Due to the high demand for compression recovery tests of metal gaskets, it is difficult to provide and evaluate uniform stress on metal gaskets. To effectively evaluate the uniformity of surface stress on a metal gasket, we propose a method of evaluating gasket surface stress based on gray-level co-occurrence matrix theory. Angular second moment and entropy are selected as the main characteristic parameters, and the evaluation indexes (f1 and f2) are proposed. The analysis is based on finite element calculation under different parameters of a gasket test rig. The angular second moment and entropy curve of the stress distribution cloud map are drawn according to the result of finite element calculation. The results show that the method can evaluate the uniformity of stress distribution. The best parameters of the gasket testing rig are obtained by analyzing the uniformity evaluation index. The method can realize rapid comparison and accurate evaluation of the gasket surface stress.

show abstract

Failure analysis of the conical gaskets in ultra-high pressure pipeline sealing devices: Experiment and numerical simulation

Cited by 8 publications

References 29 publications

Long-term sealing performance evaluation and service life prediction of O-rings under thermal–mechanical coupling conditions

Long-term sealing performance evaluation and service life prediction of O-rings under thermal–mechanical coupling conditions

Study on life distribution and prediction method of flexible graphite composite reinforced gasket

Evaluation of Gasket Surface Contact Stress Uniformity Based on Gray-Level Co-Occurrence Matrix

Contact Info

Product

Resources

About