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The definition, and the type of tests of pressure vessels

The definition, and the type of tests of pressure vessels

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What is the pressure vessel?

Pressure vessels are industrial containers that hold liquids, gases, or vapors, where the interior pressure is higher than the exterior pressure.

The pressure vessel is utilized in industrial facilities, hotels, construction sites, and commercial buildings. The pressure vessel is considered an extremely dangerous part of the workplace if the safety & security criteria and the necessary inspections are not taken into account before using the vessel.

Types of pressure vessels

It’s important to note that the term “pressure vessel” can refer to a variety of storage containers used in industrial settings. 

We have to note that the term “pressure vessel” is used to refer to a variety of storage tanks utilized in industrial sectors.

There are different types of pressure vessels, and here we will discuss three of the most popular kinds of pressure vessels:

  • Storage vessels. Storage tanks are commonly utilized to store gases and liquids for industrial purposes and come in different sizes and shapes. In addition, It is often manufactured from carbon steel materials. Some products can be stored in vessels; butane, propane, chlorine, ammonia, Liquefied Natural Gas (LNG), and Liquefied petroleum gas (LPG).
  • Boilers. The purpose of boilers is to heat liquids and then used them as a source of power for various operations. For that, It is used alloy steel material for manufacturing the boilers to ensure that it endures high temperatures, thermal stress, and high pressure. 
  • Process vessels. Process tanks are commonly utilized as a part of the production operations lines, such as drug manufacturing, food processing facilities, refineries, paint manufacturing, and so on. Typically the process vessels are made from carbon steel.

What is the type of pressure vessel test?

The most common types of tests applied on the pressure vessel are:

1.     Visual Testing:

It is a comprehensive visual inspection of both the interior and exterior of the vessel in order to detect any cracks or flaws in the design.

2.     Ultrasonic Testing

It is an inspection that uses ultrasonic to measure the thickness of a material’s surface to find any cracks or flaws that may have arisen.

A defect is discovered by sending ultrasound through the material. if ultrasound hits a defect, it will bounce off of it, indicating its presence, but If there are no defects in the material, ultrasound will pass through it.

3.     Radiographic Testing

It is a test that uses radiation to create images of things that can’t be seen by the naked eye and through that, we can reveal the condition of the vessel.

4.     Magnetic Particle Testing

It is an inspection that uses a magnetic current run through the pressure vessel to determine distortions or defects on the surface of the vessel. The defect is identified through an occurrence cut off of the flow of the magnetic current, and appears as a “flux leakage field”.

5.     Dye or liquid Penetrant Testing

It is an inspection that is used to detect any defects that cannot be seen by the naked eye, and that is done by adding dye or liquid on the surface or using a fluorescent chemical in dimly lit places. After that, leave it for 10 – 20 minutes according to the type of material until the liquid or dye fills the cracks and flaws, and then the excess liquid on the material is removed.

Carrying out all necessary tests and inspections and securing the workplace area correctly ensures the safety of employees, high quality in performance, and acquisition of customer confidence.

Atlas Support and Services Company provides inspection services as an internationally accredited third party, and as a leading competency center for inspection, testing, calibration, evaluation and auditing, training, periodic checks, and giving ISO certifications in the Kingdom of Saudi Arabia and all countries of the Gulf Cooperation Council.

If you are looking for our services or you have some questions, you can contact us via our email ( or call on (‭00966112080550)‬. And we will be very glad to assist you



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