Remaining Useful Life Time of Gas Compressor in Kollness Field

This thesis contains information related to models that are established to calculate availability of a system using Markov process. The system that we study for this report is gas compressors that are operated by STATOIL and located in Kollness - Norway. STATOIL has six gas compressor trains that are made up from assembly unit of one variable speed drive, one unit of electrical motor, one unit of gear box, and one unit of gas compressor. The main goal of the project is to build models that are capable to represent the actual condition of the system with different possible maintenance strategies. The models are developed start from a simple and basic condition until the involvement of degradation states. We will also discuss how an early treatment such as preventive maintenance toward degraded units will give big impact to system s performance