english 
Rust in diesel fuel tanks can lead to various issues, from fuel contamination to tank leaks. Therefore, regular detection of rust is crucial to maintain the integrity of the tank and the performance of diesel - powered systems.
External Visual Inspection
The simplest way to start detecting rust is by visually examining the exterior of the tank. Look for signs of discoloration, especially reddish - brown or orange patches, which are typical indicators of rust. Check areas prone to moisture accumulation, such as the bottom of the tank, seams, and around fittings. Pay attention to any blistering or flaking of the paint. These could be early signs that rust is forming beneath the surface. Even small areas of rust should not be ignored, as they can quickly spread.
Interior Inspection
For a more comprehensive check, the interior of the tank needs to be inspected. However, this requires draining the fuel first, which should be done following proper safety procedures. Once the tank is empty, use a flashlight to look for rust on the inner walls. Rust may appear as flakes or a powdery substance. Check the bottom of the tank carefully, as sediment and water tend to accumulate there, accelerating the rusting process.
Using Tools
Specialized tools can help detect rust more accurately. A magnetic thickness gauge can measure the thickness of the tank walls. A significant decrease in thickness may indicate rust corrosion. Ultrasonic testing devices can also be used. They send high - frequency sound waves through the tank walls. If there are any rust - related defects, the waves will be reflected or absorbed differently, allowing technicians to identify problem areas.
Fuel Analysis
Analyzing the fuel can also provide clues about rust inside the tank. Rust particles in the fuel can cause it to appear cloudy or discolored. If there are signs of rust in the fuel, it's highly likely that the tank has rusted. Fuel filters can also be inspected. If they are clogged with rust particles, it indicates rust formation within the tank.