Pressure vessels are equipment used in various industries and require a thorough review from the design stage to ensure safety and reliability. In particular, the minimum thickness of pressure vessels is an important role in meeting safety and certification standards.

Key factors to consider when designing pressure vessels

- Design Pressure and Temperature

: It should be designed with the internal pressure, external pressure, and operating temperature of the vessel in mind.

- Material Selection

: Materials suitable for operating conditions such as corrosion, high temperature, high pressure, etc. must be selected.

- Shape and Thickness

: The shape and thickness of the pressure vessel must be considered both for safety and affordability.

- Safety devices

: Safety devices such as safety valves should be included in the design.

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Pressure vessel thickness

The minimum thickness of the pressure vessel is a key factor in meeting safety and certification standards. Lack of minimum thickness can cause the vessel to fail to withstand internal pressure, resulting in rupture. Conversely, excessive thickness can lead to increased costs and inefficiency.

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Minimum Thickness Regulation

The minimum thickness of the pressure vessel is determined by considering the internal pressure, external pressure, and corrosion allowance. For example, the Korea Occupational Safety and Health Agency (KOSHA) stipulates that the minimum thickness of the pressure maintaining component is 1.5 mm or more, except in a few special cases. This is the minimum standard for ensuring safety, excluding corrosion allowance.

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Step-by-step process from design to certification

- Basic Design

: Define the purpose and operating conditions of the container, and set design pressures and temperatures.

- Detailed Design

: includes minimum thickness calculation, material selection, shape design, and more.

- Drawings

: Draws the design and submits it to the certification body.

- Manufacturing and inspection

: Manufacture containers according to design and verify quality through non-destructive inspection (NDT) etc.

- Certification

: Final certification is obtained through review the test by the certification authority.

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In order to certify the pressure vessel, you need to prepare various documents such as drawings, invoices, and inspection reports. Each certification authority has its own requirements, so you need to know them in advance and thoroughly review them.

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