Oil pipeline maintenance has always been considered a problem of importance to oil companies. Before leakage happens, it must be detected, and preventive action must be taken to avoid oil losses and environmental problems. Corrosion in the lower portion of the pipeline due to the accumulation of water and other corrosive chemicals is one of the major causes of oil pipeline leakage. One of the techniques used to verify the conditions of the oil pipelines is the running of a data collection system throughout the whole length of the pipeline (which could be kilometres) to gather data about the corrosion and its location inside the pipeline. This system is commonly referred to as the Pipeline Inspection Gauge (PIG) which performs automatic pipeline inspection with Non-Destructive Testing (NDT) technologies such as ultrasonic and magnetic flux leakage. The ultrasonic probe helps experts to calculate the thickness of the wall of the pipeline through the Time of Flight Diffraction (TOFD). The aim of the investigation included in the research presented is to design and develop an ultrasonic PIG to be suitable for entry into the carbon steel pipe with a 323.85 Millimetre diameter. The PIG has 18 ultrasonic transducers to cover the whole area, an orientation system, a support system, a storage system, a support system, and a storage system.