Turbine inspection is carried out in a number of ways. One of the popular methods is either the use of a Borescope and the Dye Penetrant method. The dye penetrant method is basically an advanced phase of the visual method of conducting non-destructive testing. In this method, firstly the surface to be examined is thoroughly cleaned in order that there are no traces of dirt or grease. A solvent is used in this phase. In the next phase a fluorescent dye is sprayed on the surface and thereafter it’s left to soak for about 20 minutes. Any excess dye is removed. Thereafter, in the third phase a developer is applied. This developer, a powder, actually absorbs the dye so that the defects on the surface are clearly exposed. This variety of fluorescent dye is however not used generally for turbine inspection in the industry since it would require a darkened room. Instead a red dye is used in a system employing 3 cans, one each for the cleaner, the penetrant and the developer.
Pipeline inspection is often carried out by the Magnetic Flux Leakage (Induction) method that uses a powerful magnetic field to reveal flaws in pipelines. An advanced method of pipeline inspection uses multiple sensors and GPS to pinpoint the source of the defects.