Structural Health Monitoring of Offshore Buoyant Leg Storage and Regasification Platform: Experimental Investigations

Abstract

Offshore platforms are of high strategic importance, whose preventive maintenance is on top priority. Buoyant Leg Storage and Regasification Platforms (BLSRP) are special of its kind as they handle LNG storage and processing, which are highly hazardous. Implementation of structural health monitoring (SHM) to offshore platforms ensures safe operability and structural integrity. Prospective damages on the offshore platforms under rare events can be readily identified by deploying dense array of sensors. A novel scheme of deploying wireless sensor network is experimentally investigated on an offshore BLSRP, including postulated failure modes that arise from tether failure. Response of the scaled model under wave loads is acquired by both wired and wireless sensors to validate the proposed scheme. Proposed wireless sensor network is used to trigger alert monitoring to communicate the unwarranted response of the deck and buoyant legs under the postulated failure modes. SHM triggers the alert mechanisms on exceedance of the measured data with that of the preset threshold values; alert mechanisms used in the present study include email alert and message pop-up to the validated user accounts. Presented study is a prima facie of SHM application to offshore platforms, successfully demonstrated in lab scale.

Keywords

Wireless sensor network / Structural health monitoring / Condition-based monitoring / Response analysis / Alert Monitoring System / Underwater sensors / Postulated failure

References

[1] Alves RM, Batista RC 1999 Active/passive control of heave motion for TLP type of offshore platforms. International Offshore and Polar Engineering Conference (ISOPE), Brest, France, 332–338. Document ID: ISOPE-I-99-050

[2] Brownjohn JM. Structural health monitoring of civil infrastructure. Philos Trans R Soc A Math Phys Eng Sci, 2007, 365(1851): 589-622

[3] Brownjohn JM, De Stefano A, Xu YL, Wenzel H, Aktan AE. Vibration-based monitoring of civil infrastructure: challenges and successes. J Civ Struct Heal Monit, 2011, 1(3–4): 79-95

[4] Celebi M (2002) Seismic instrumentation of buildings, Special GSA. USGS Project, an administrative report, United States Geological Survey, Menlo Park, CA

[5] Chandrasekaran S (2011) Risk assessment and management in offshore and petroleum industries. In: Key note address at Pre-conference workshop on International Conference on Asia Pacific HSE Forum on Oil, Gas and Petrochemicals, Fleming Gulf Conferences, p. 81

[6] Chandrasekaran S. Dynamic analysis and design of ocean structures, 2015, India: Springer

[7] Chandrasekaran S. Advanced marine structures, 2015, Florida (USA): CRC Press

[8] Chandrasekaran S. Health, safety and environmental management for offshore and petroleum engineers, 2016, U.K.: Wiley

[9] Chandrasekaran S. Offshore structural engineering: reliability and risk assessment, 2016, Florida: CRC Press, 14-987

[10] Chandrasekaran S, Koshti Y. Dynamic analysis of a tension leg platform under extreme waves. J Nav Archit Mar Eng, 2013, 10: 59-68

[11] Chandrasekaran S, Lognath RS. Dynamic analyses of buoyant leg storage regasification platform (BLSRP) under regular waves:experimental investigations. Ships Offshore Struct, 2016, 12(2): 227-232

[12] Chandrasekaran S, Lognath RS. Dynamic analyses of Buoyant Leg Storage and Regasification platforms: numerical studies. J Mar Syst Ocean Tech, 2017, 12: 39-48

[13] Chandrasekaran S, Thailammai C (2016) Health monitoring of offshore structures using wireless sensor network: experimental investigations. Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016, 980416. https://doi.org/10.1117/12.2219208

[14] Chandrasekaran S, Kumar D, Ramanathan R. Dynamic response of tension leg platform with tuned mass dampers. J Nav Archit Mar Eng, 2013, 10(2): 149-156

[15] Chandrasekaran S, Thailammai C, Khader SA. Structural health monitoring of offshore structures using wireless sensor networking under operational and environmental variability. Int J Environ Chem Ecol Geol Geophys Eng, 2016, 10(1): 33-39

[16] Farrar CR, Worden K. An introduction to structural health monitoring. Philos Trans R Soc Lond A Math Phys Eng Sci, 2007, 365(1851): 303-315

[17] Hosseinlou F, Mojtahedi A. Developing a robust simplified method for structural integrity monitoring of offshore jacket-type platform using recorded dynamic responses. Appl Ocean Res, 2016, 56: 107-118

[18] Jahangiri Vahid, Mirab Hadi, Fathi Reza, Ettefagh Mir Mohammad. TLP Structural Health Monitoring Based on Vibration Signal of Energy Harvesting System. Latin American Journal of Solids and Structures, 2016, 13(5): 897-915

[19] Jalalpour M, Azarbayejani M, El-Osery A, Taha MR. A new damage detection and tracking method using smart sensor network. J Civ Struct Heal Monit, 2016, 6(2): 291-301

[20] Lee Y, Blaauw D, Sylvester D. Ultralow power circuit design for wireless sensor nodes for structural health monitoring. Proc IEEE, 2016, 104(8): 1529-1546

[21] Li HN, Ren L, Jia ZG, Yi TH, Li DS. State-of-the-art in structural health monitoring of large and complex civil infrastructures. J Civ Struct Heal Monit, 2016, 6(1): 3-16

[22] Lynch JP, Law KH, Kiremidjian AS, Carryer E, Farrar CR, Sohn H, Allen DW, Nadler B, Wait JR. Design and performance validation of a wireless sensing unit for structural monitoring applications. Struct Eng Mech, 2004, 17(3–4): 393-408

[23] Lynch JP, Sundararajan A, Law KH, Kiremidjian AS, Carryer E. Embedding damage detection algorithms in a wireless sensing unit for operational power efficiency. Smart Mater Struct, 2004, 13(4): 800-810

[24] Moharrami M, Tootkaboni M. Reducing response of offshore platforms to wave loads using hydrodynamic buoyant mass dampers. Eng Struct, 2014, 81: 162-174

[25] Mollineaux M, Balafas K, Branner K, Nielsen P, Tesauro A, Kiremidjian A, Rajagopal R (2014) Damage detection methods on wind turbine blade testing with wired and wireless accelerometer sensors. EWSHM-7th European Workshop on Structural Health Monitoring. [hal-01022037]

[26] Patil KC, Jangid RS. Passive control of offshore jacket platforms. Ocean Eng, 2005, 32: 1933-1949

[27] Pérez CA, Jimenez M, Soto F, Torres R, López JA, Iborra A (2011) A system for monitoring marine environments based on wireless sensor networks. OCEANS, 2011 IEEE-Spain, 1–6. https://doi.org/10.1109/Oceans-Spain.2011.6003584

[28] Spencer BF Jr, Jo H, Mechitov KA, Li J, Sim SH, Kim RE, Cho S, Linderman LE, Moinzadeh P, Giles RK. Recent advances in wireless smart sensors for multi-scale monitoring and control of civil infrastructure. J Civ Struct Heal Monit, 2016, 6(1): 17-41

[29] Straser EG, Kiremidjian AS, Meng TH (2001) Modular, wireless damage monitoring system for structures. US Patent 6,292,108

[30] Swartz RA, Zimmerman AT, Lynch JP, Brady TF, Rosario J, Salvino LW, Law KH (2009) Wireless hull monitoring systems for modal analysis of operational naval vessels. Proceedings of the International Modal Analysis Conference (IMAC) XXVII, 57

[31] Wang Y, Lynch JP, Law KH. A wireless structural health monitoring system with multithreaded sensing devices: design and validation. Struct Infrastruct Eng, 2007, 3(2): 103-120

[32] Wang S, Yue Q, Zhang D. Ice-induced non-structure vibration reduction of jacket platforms with isolation cone system. Ocean Eng, 2013, 70(15): 118-123

[33] Yu Y, Ou J. Wireless sensing experiments for structural vibration monitoring of offshore platform. Front Electr Electron Eng Chin, 2008, 3(3): 333-337

[34] Zang B-L, Han Q-L, Zhang X-M. Recent advances in vibration control of offshore platforms. Nonlinear Dyn, 2017, 89(2): 755-771