Reliability-based Maintenance Plan for Underground Drilling Rigs
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
In the mining industry, drilling is one of the key processes. The drilling is the process of making holes in the walls and face of the underground shafts and rooms. The holes are then charged and blasted (Al-Chalabi, 2014).Drilling operations are performed in a harsh environment and are subject to a high number of failures in its subsystem. The cause of failure is not only environmental, but also the manoeuvring of the drilling rigs and the maintenance has an impact on the drilling rigs reliability (Al-Chalabi, 2014).The purpose of this thesis is to find the optimal maintenance interval for the subsystems critical for preventing downtime of the drilling rigs. The suggested optimal maintenance interval will optimise the maintenance schedule and prevent unplanned corrective maintenance actions.It has been found in this thesis that up to 78% of the maintenance actions performed is corrective maintenance actions. By implementing a reliability-based maintenance strategy, the amount of unplanned corrective maintenance could be reduced.The thesis is based on case studies of four drilling rigs, operating in two different mines. The results reveal both similarities and difference between the studied mines. Further investigations have been done to find the reason for the poor reliability of the hoses.A literature study has been carried out, observations have been done in the case studied mine aswell as analysing the collected data. The data has been processed by using the theories and methodologies described in the literature.Based on the results from the observation and data analysis, optimal maintenance interval for the most critical subsystems has been suggested. Some weakness affecting the reliability of the hoses has been highlighted to increase the reliability.The results from this thesis can be used for planning maintenance actions and to get a better understanding of the failures that occurs in the drilling rig. Since four different drilling rigs have been analysed, a comparison has been made between the rigs. The results reveal that there is both similarities and differences between the rigs.Keyword: Drilling rig; Mining industry; Optimum maintenance interval; Reliability analysis; Maintenance strategy; Underground mining rig; Mining Management; Maintenance engineering.
Place, publisher, year, edition, pages
2016. , 68 p.
Teknik, Underjordsbrytning rigg, borrning rigg, gruvindustri, optimal underhållsintervall, tillförlitlighet analys, underhållsstrategi
IdentifiersURN: urn:nbn:se:ltu:diva-54758Local ID: baf0be45-b4e2-4468-8792-059d24bb3de7OAI: oai:DiVA.org:ltu-54758DiVA: diva2:1028140
Subject / course
Student thesis, at least 30 credits
Civil Engineering, master's level
Validerat; 20160710 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved