Semi-Analytical Methods for the Joint Strength and Sealing Performance in the Failure Process of the Subsea Pipeline Compression Connector

• Published in: Journal of marine science and engineering Vol. 11; no. 7; p. 1417
• Main Authors: Li, Zhenyu, Wang, Gang, Wang, Xiangyu, Yao, Shaoming, Yun, Feihong, Jia, Peng, Wang, Liquan
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.07.2023
• Subjects: Analytical methods; Compression; compression connector; Compressive strength; Connectors; Deformation; Failure; Finite element method; joint strength; Laminar flow; Mathematical models; membrane theory; Metals; Methods; Overloading; Performance evaluation; Pipe lines; Pressure distribution; Prototypes; Reynolds equation; Sealing; sealing performance; Seals (stoppers); semi-analytical method; Steel pipes; Strength; Structural analysis; Topography; Underwater pipelines; Underwater structures
• ISSN: 2077-1312; 2077-1312
• DOI: 10.3390/jmse11071417

Radial seals are sensitive to axial overload failure and may cause leaks. This paper presents two semi-analytical methods for the joint strength and sealing performance of the subsea pipeline compression connector under axial overload failure. The method for the joint strength consists of two parts: One is the analytical model for the joint strength of the connection and seal under axial tension and compression conditions. The models are based on membrane theory, considering the hardening and bending effects. The other is a two-dimensional, axisymmetric finite element model for the joint strength of the radial metal seal. The semi-analytical method for the overload sealing performance is derived using a finite element model and the Reynolds equation of the laminar flow. The effects of critical parameters on the joint strength and the overload sealing performance are analyzed. The experiments are carried out with specimens and prototypes to evaluate the evolution of the sealing interface and the joint strength. The results show that both the internally turned sealing surface and the deflection of the pipe can improve the joint strength. In addition, the compression-type connector can remain sealed under the maximum axial overload. The proposed methods allow the prediction and identification of the overload joint strength and the sealing condition of the compression-type connector and provide a better understanding of the radial metal seal under the axial overload condition.