Risk Assessment of Dropped Objects on Topside Facilities and Subsea Pipelines


  • M F. Irfan Ahmad Fuad
  • M A Zakwan Hamidi
  • M Ammar Abidin
  • Z Abdul Rashid
  • K Abdul Razak




Risk Assessment, Dropped Object, Frequency, Impact Energy, Consequences Analysis


Falling object and swinging load impacts due to mechanical handling failures can occur in industrial facilities both onshore and offshore. The risk of accidental dropped object is considered as one of major risk categories predominantly in offshore production platform. As part of the offshore platform engineering design development, there is a need to consider the potential risk arising from falling object and swinging load impacts during routine and non-routine lifting activities utilizing platform pedestal crane. Dropped Object Risk Study as part of formal safety assessment is predominantly used to support the design of an offshore platform. The interest is focused on impacts to platform designated laydown area, structures, process equipment and subsea pipelines. The consequences from such events may include injuries or fatalities among personnel underneath, damage to equipment containing hydrocarbons onboard and subsea pipelines (overboard) resulting to leaks and hydrocarbon fires in extreme cases and damage to the platform structure either localized or as a whole. The results and findings from dropped object risk study will be used to specify requirements for engineered and operational safeguards to mitigate the risks. These include requirement of adequate integrity of deck/laydown or restriction on lifting pathways.




[1] B. Olivier and R.R. Diane, “Reliability Analyses for Innovative LNG Offshore Floating Units†ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering, Volume 2A: Structures, Safety and Reliability, Nantes, France, June 9–14, 2013

[2] M. R. U. Kawsar, S. A. Youssef, M. Faisal, A. Kumar, J. K. Seo, and J. K. Paik, “Assessment of dropped object risk on corroded subsea pipeline,†Article in Ocean Engineering, vol. 106, pp. 329–340, 2015.

[3] W. F. Leong and B. Hughes, “SPE 156704 Dropped Object Prevention Scheme ( DROPS ) - An Asia Pacific Perspective Progress of Dropped Object Prevention in the Asia Pacific Oil and Gas Industry,†2012.

[4] A. J. Dick and R. Dhar, “Risk Assessment as a Tool in Establishing the Requirement of Subsea Isolation Valves in Subsea Pipelines,†Conference Paper, OnePetro SPE Americas E&P Environmental and Safety Conference, 23-25 March, San Antonio, Texas

[5] A. W. Dawotola, T. B. Trafalis, Z. Mustaffa, P. H. A. J. M. van Gelder, and J. K. Vrijling, “Risk-Based Maintenance of a Cross-Country Petroleum Pipeline System,†Journal of Pipeline Systems Engineering and Practice Volume 4 Issue 3 - August 2013

[6] A. Sari, U. Azimov, H. Nguyen, Genesis Oil and Gas Consultants, “Dropped Object Assessment of Subsea Assets and Pipeline Protection,†OnePetro Offshore Technology Conference Asia, 22-25 March, Kuala Lumpur, Malaysia 2016.

[7] DNV, “DNV-RP-F107: Risk Assessment of Pipeline Protection,†DNV Recommended Practice., no. October, pp. 1–45, 2010.

[8] F. Wang, M. Zhou, and W. Fang, “An Investigation on the Subsea Equipment Influenced by the Dropped Object Impact Loads,â€
OnePetro International Society of Offshore and Polar Engineers
, The Twenty-fourth International Ocean and Polar Engineering Conference, 15-20 June, Busan, Korea vol. 3, pp. 779–782, 2014.

[9] N. O. and A. A. U.S. Department of Commerce, “How ALOHA Works,†U.S. Department of Commerce, National Oceanic and Atmospheric Administration, July 2015.

[10] I. Fossan, J. A. Pappas, S. Nodland, S. S. Dhanabalan, A. Buhugni, and A. Shim, “Next generation 3D dropped object risk assessment,†OnePetro, SPE International Conference and Exhibition on Health, Safety, Security, Environment, and Social Responsibility, 11-13 April, Stavanger, Norway 2016.

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How to Cite

F. Irfan Ahmad Fuad, M., A Zakwan Hamidi, M., Ammar Abidin, M., Abdul Rashid, Z., & Abdul Razak, K. (2018). Risk Assessment of Dropped Objects on Topside Facilities and Subsea Pipelines. International Journal of Engineering & Technology, 7(3.26), 42–47. https://doi.org/10.14419/ijet.v7i3.26.18166
Received 2018-08-24
Accepted 2018-08-24