dc.contributor.advisor Lundteigen, Mary Ann nb_NO dc.contributor.advisor Rausand, Marvin nb_NO dc.contributor.author Pinker, Remi nb_NO dc.date.accessioned 2014-12-19T12:20:49Z dc.date.available 2014-12-19T12:20:49Z dc.date.created 2013-06-16 nb_NO dc.date.issued 2012 nb_NO dc.identifier 629184 nb_NO dc.identifier ntnudaim:7616 nb_NO dc.identifier.uri http://hdl.handle.net/11250/240823 dc.description.abstract A blowout preventer is a safety critical system that is used during drilling and well interventions of oil and gas wells to make sure the operations are safe. The main function of a blowout preventer system is to seal the well in order to prevent a blowout. There are several different blowout prevent stack configurations in use, and each of these configurations have their pros and cons. Giving an accurate representation of the reliability of a blowout preventer system can be challenging. A blowout preventer goes through many different operational situations, and the BOPs ability to act as a safety barrier will vary for each of these situations. Giving an average estimate of the BOPs ability to function on demand is therefore not an adequate reliability parameter. The main objective of this master thesis is therefore to propose a new and improved method for reliability assessment of blowout preventer systems. A new approach to reliability assessment of blowout preventers is presented in this thesis. To account for the sequence of events, a fault tree analysis is combined with an event tree analysis. Fault tree analyses are performed to calculate the PFD for each of the branches in the event tree. The probability of each of the end states in the event tree can then be calculated. This will give a more accurate result then a fault tree analysis on its own. Separate analyses are made for the two main operational situations. One for the operational situations “open hole” and another for the operational situation “drill pipe going through the BOP”. Having two separate analyses gives a more accurate representation of the reliability at the given times, because the barriers in effect vary depending on what operational situation the BOP is going through. nb_NO dc.language eng nb_NO dc.publisher Institutt for produksjons- og kvalitetsteknikk nb_NO dc.title Improved Methods For Reliability Assessments Of Safety-Critical Systems: An Application Example For BOP Systems nb_NO dc.type Master thesis nb_NO dc.source.pagenumber 71 nb_NO dc.contributor.department Norges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for produksjons- og kvalitetsteknikk nb_NO
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