Researchers seldom study the optimum design of a mechanical connector for subsea oil-gas pipeline based upon the sealing performance. An optimal design method of a novel subsea pipeline mechanical connector is presented. By analyzing the static metal sealing mechanism, the critical condition of the sealing performance is established for this connector and the formulation method of the contact pressure on the sealing surface is created. By the method the minimum mean contact pressure of the 8.625 inch connector is calculated as 361 MPa, which is the constraint condition in the optimum design of connector. The fnite element model is created in ANSYS Parametric Design Language (APDL) and the structure is optimized by the zero-order method, with variance of contact pressure as the objective function, and mean contact pressures and plastic strains as constraint variables. The optimization shows that variances of contact pressure on two sealing surfaces decrease by 72.41% and 89.33%, respectively, and mean contact pressures increase by 31.18% and 52.84%, respectively. The comparison of the optimal connectors and non-optimal connectors in the water pressure experiments and bending experiments shows that the sealing ability of optimized connectors is much higher than the rated pressure of 4.5 MPa, and the optimal connectors don't leak under the bending moment of 52.2 kN·m. This research provides the formulation to solve contact pressure on the sealing surface and a structure optimization method to design the connectors with various dimensions.
Li-Quan Wang
,
Zong-Liang Wei
,
Shao-Ming Yao
,
Yu Guan
,
Shao-Kai Li
. Sealing Performance and Optimization of a Subsea Pipeline Mechanical Connector[J]. Chinese Journal of Mechanical Engineering, 2018
, 31(1)
: 18
-18
.
DOI: 10.1186/s10033-018-0209-6
[1] L Q Wang, C D Wang, J Liu. Error analysis and prototype testing of deepwater pipe fange connection tool. Proceedings of the Institution of Mechanical Engineers Part C-Journal of Mechanical Engineering Science, 2013, 288(11):1978-1993.
[2] W M Wang, L Q Wang, C D Wang. A novel deepwater structure pose measurement method and experimental study. Measurement, 2012, 45(5):1151-1158.
[3] L Q Wang, H Y Gong, X D Xing, et al. Rigid dynamic performance simula-tion of an ofshore pipeline plough. Ocean Engineering, 2015, 94:51-66.
[4] A Jasper. Oil/Gas pipeline leak inspection and repair in underwater poor visibility conditions:challenge and perspective. Journal of Environmental Protection, 2012, 3(5):394-399.
[5] B E Morris. Tapping connector and method of using same: USA, US6691733B1. 2004-2-17.
[6] J W Pallini JR, S Wrong. External hydraulic tieback connector: USA, US9062513B2. 2015-6-23.
[7] K V Trepka, S Caspersen. Subsea tool for tie in of pipeline ends: USA, US6997645B2. 2006-2-14.
[8] D L Ford. Adapter sleeve for wellhead housing: USA, US7798231B2. 2010-9-21.
[9] B H Van Bilderbeek. Pipeline joint: USA, US7344162B2. 2008-3-18.
[10] J Hartmann, A Kaufmann, S Gelbrich, et al. Coupling device: USA, US20140008911A1. 2014-1-9.
[11] H Gottfried. Coupling device for establishing a permanent non-removable pipe connection: World Intellectual Property Organization, WO, 2005/068888A1. 2005-7-28.
[12] C Marie, D Lasseux. Experiment leak-rate measurement through a static metal seal. Journal of Fluids Engineering, 2007, 129(6):799-805.
[13] American Society of Mechanical Engineers. ASME BPVC-Ⅷ-Ⅰ Rules for construction of pressure vessels. New York:American Society of Mechanical Engineers, 2007.
[14] Deutsches Institute für Normung. DIN 26961999-08 Lenticular Ring Joint Gaskets for Flanged Joints. Berlin:Deutsches Institute für Normung, 1999.
[15] M M Krishna, M S Shunmugam, N S Prasad. A study on the sealing perfor-mance of bolted fange joints with gaskets using fnite element analysis. International Journal of Pressure Vessels and Piping, 2007, 84(6):405-411.
[16] B N J Persson. Leakage of metallic seals:role of plastic deformations. Tribology Letters, 2016, 63(3):1-6.
[17] M Kazeminia, A H Bouzid. Evaluation of leakage through graphite-based compression packing rings. Journal of Pressure Vessel Technology, 2016, 139(1):011602(1-7).
[18] H L Zhao, R Chen, X L Luo, et al. Metal sealing performance of subsea X-tree wellhead connector sealer. Chinese Journal of Mechanical Engineering, 2015, 28(3):649-656.
[19] T Sawa, N Ogata. Stress analysis and the sealing performance evalua-tion of pipe fange connection with spiral wound gaskets under internal pressure. ASME Pressure Vessels and Piping Conference, Vancouver, Canada, August 5-9, 2002: 115-127.
[20] T Takaki, T Fukuoka. Three-dimensional fnite element analysis of pipe fange connections: the case of using compressed asbestos sheet gasket. ASME Pressure Vessels and Piping Conference, Vancouver, Canada, August 5-9, 2002: 171-177.
[21] I Nitta, Y Matsuzaki, Y Tsukiyama, et al. Thorough observation of real contact area of copper gaskets using a laser microscope with a wide feld of view. Journal of Tribology, 2013, 135(4):041103(1-7).
[22] D Joshi, P Mahadevan, A Marathe, et al. Unimportance of geometric nonlinearity in analysis of fanged joints with metal-to-metal contact. International Journal of Pressure Vessels and Piping, 2007, 84(7):405-411.
[23] M Abid, D H Nash. A parametric study of metal-to-metal contact fanges with optimized geometry for safe stress and no-leak conditions. International Journal of Pressure Vessels and Piping, 2004, 81(1):67-74.
[24] M Guindani, G Ramorino, S Agnelli, et al. Optimization of the sealing per-formance in transient conditions of rubber based hybrid nanocompos-ites by carbon nanotubes, as assessed by a tailored recovery test. Polymer Testing, 2016, 56:229-236.
[25] A Bouzid, A Chaaban, A Bazergui. The infuence of the fange rotation on the leakage performance of bolted fanged joints. Proceedings of the CSME Forum, Montreal, Canada, June 27-29, 1994: 184-194.
[26] D Wu, S P Wang, X J Wang. A novel stress distribution analytical model of O-ring seals under diferent properties of materials. Journal of Mechanical Science and Technology, 2017, 31(1):289-296.
[27] N A Noga, M Nagawa, F Shiraishi, et al. Sealing performance of new gasketless fange. Journal of Pressure Vessels Technology, 2002, 124(2):239-246.
[28] F Robbe-valloire, M Prat. A model for face-turned surface microgeometry application to the analysis of metallic static seals. Wear, 2008, 264(11-12):980-989.
[29] A H Bouzid, M Dlany, M Derenne. Determination of gasket efective width based on leakage. ASME/JSME 2004 Pressure Vessels and Piping Conference, California, America, July 25-29, 2004: 105-111.
[30] M A Choiron, Y Kurata, S Haruyama, et al. Simulation and experimenta-tion on the contact width of new metal gasket for asbestos substitution. International Journal of Aerospace and Mechanical Engineering, 2011, 75:283-287.
[31] H H Bucher. Industrial sealing technology. Beijing:Chemical Industry Press, 1988. (in Chinese).
[32] L Q Wang, Z L Wei, Y Guan, et al. A novel subsea pipeline connection method and experimental study. Proceedings of the 26th International Ocean and Polar Engineering Conference, Rhodes, Greece, June 26-July 2, 2016:907-913.
[33] International Organization for Standardization. ISO 21329 Petroleum and Natural Gas Industries-Pipeline Transportation Systems-Test Procedures for Mechanical Connectors. Switzerland:International Organization for Stand-ardization, 2004.
