<![CDATA[In the oil and gas industry, the exploitation process requires reliable equipment to ensure safe and efficient operations. This equipment is divided into surface and subsurface categories, with tubing as a key component. Tubing serves as a conduit for fluid flow from the reservoir to the surface, requiring adherence to strict standards to maintain operational reliability. Defects such as coating peel-off can increase the risk of leakage and pose safety hazards. This study analyzes coating defects in 3.5-inch tubing using the Fishbone Diagram and Failure Mode and Effect Analysis (FMEA) methods. The Fishbone Diagram identifies potential causes of defects across five factors: human, method, material, environment, and machine. FMEA is then used to prioritize these causes by evaluating Severity, Occurrence, and Detection to determine the Risk Priority Number (RPN). The findings indicate that the most dominant cause, with the highest RPN of 183.5, is rushed work. To mitigate this, it is recommended to revise and implement a more realistic work schedule to reduce the likelihood of similar coating defects in the future. Keywords: Defect, Failure Mode Effect Analysis, Fishbone Diagram, Risk Priority Number, Tubing]]>
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