Development Fitness-for-Service Application Program with Case Study on Equipment Used in Oil and Gas Sector

Abstract

Fitness For Service (FFS) analysis is very usefull for maintenance and inspection in order to make post inspection analysis, especially to take decision about run, repair or re-rate. As time went on and interaction with the environment, those equipments will be degraded thus it will affect the reliability of equipments, and company needs to analyze the effect of degradation for equipments lifetime by using FFS methods. In order to reactivate or increase component lifetime in oil and gas facility, many parameters and quantification method is needed because of the high risk of oil and gas operating condition. In this final task, the equipment has been analyzed using standard API 579 section 4, 5, 9 and 14 for levels 1 and 2. The method consists of several steps complex mathematical calculations, so to make it easier to do analysis writer has developed software for the calculation of each of these levels using Visual Basic 2012. Many case studies also carried out in static mechanical equipment, which include vertical storage tank (DSTs and ST), cone mixer and KO Drum. The case study is taken from oil and gas storage facility which has been used for more than 10 years. From the results of the inspection can be concluded that mostly in storage tanks will occurs general corrosion (thickness covarians < 10%), but there are many possibilities that localize thin area (LTA) also happen. For equipments that damaged by LTA, root cause analysis should be done in order to stop the LTA and solve the corrosion problem. Equipments that has crack like flaw (CLF) and fatigue, FFS analysis should be done and if those equipments pass the FFS assessment then normal operation still can continue without any major repair. In the last research writer has analyze parameters that can affect the integrity of the components that has general corrosion, LTA and CLF. Where with the increasing values of the parameters then the integrity of the components will be decreased so that it becomes unsafe to operate.