How Many Stages of Pressure Testing are there?
Pressure safety valve testing: Pressure vessels are basically containers which hold gases or liquids at a certain pressure which is different from the outside pressure. Then, these vessels can be commonly found at industrial facilities across the globe. Furthermore, some of the common applications of pressure vessels are engine cylinders, steam boilers, storing chemicals, petroleum products, etc. However, these are just a few examples as pressure vessels have infinite utility!
Though pressure vessels have great utility and will enjoy popularity in the long run as well, they have some challenges as well. The difference between the pressure inside the vessel and outside the vessel creates a hazardous situation. Pressure vessels are known for being dangerous and causing fatal accidents. Therefore, there are specific standards for manufacturing the pressure vessels. These standards mention the need for pressure vessel testing and also have guidelines for inspection process of the pressure vessels. Our company has the best NABL accredited lab in Vadodara for the same.
What is Pressure Safety Valve Testing?
Pressure vessel inspection consists of tests which verify the integrity of the new vessel. Pressure safety valve testing can also be performed on a previously installed vessel which has been repaired. Earlier, many vessels were over-pressurized and there was a risk of explosion. As a result, many specifications were introduced for governing the way of manufacturing and maintaining pressure vessels.
Some industries have their own stringent standards for governing pressure vessels. Manufacturers need to consider the applicable standards while designing and creating pressure vessels. However, there must be a way of confirming that every pressure vessel is safe. It is here that pressure vessel inspection comes into the picture. There are different types of tests for ensuring that the vessel is safe and ready to use.
Methods of Pressure Safety Valve Testing
Visual Test
This type of testing offers a general overview of the condition of the vehicle. It is important to make sure that the surface of the vessel is well-lit and clean. The vessel is tested for any erosion, cracks, corrosion, hydrogen blistering, etc. Visual inspection can bring to light some issues but detailed inspection is required to consider a vessel fit for application.
Liquid Penetrant Test
The test looks for flaws in the pressure vessel which are open to the surface. The inspector will flow a thin liquid called penetrant into the flaw. Usually, the penetrant is sprayed and left for some time to soak. They might add a fluorescent chemical to the penetrant so that it becomes visible under UV light.
Once the penetrant dries up, the inspector will wipe off the surface and use a developer for drawing out the penetrant which has seeped in through the cracks. When the penetrant come out of the surface, it reflects the severity of the flaw. It is a commonly used testing method for welded seams. However, it can also be used for plates, pipes, bars, etc.
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