Technical Articles

What is ISO NP 23695?

ISONP23695 is a technical specification that defines the requirements for the design, fabrication, inspection, testing, and certification of pressure vessels used in various industries. This standard, developed by the International Organization for Standardization (ISO), provides a comprehensive framework for ensuring the safety and reliability of pressure vessels.

Importance of ISONP23695

Compliance with ISONP23695 is crucial for manufacturers, suppliers, and users of pressure vessels. Adhering to this standard helps ensure that pressure vessels meet stringent quality and safety standards. The standard covers various aspects, including materials selection, manufacturing processes, testing procedures, and documentation requirements.

By following ISONP23695, industry professionals can achieve consistency and reliability in the production of pressure vessels. It helps prevent potential hazards such as leaks, explosions, and structural failures, which can have catastrophic consequences. Compliance with this standard also facilitates international trade, as it establishes a common language and level of compliance across different countries and regions.

Major Requirements of ISONP23695

The ISONP23695 specifies several key requirements that manufacturers must adhere to when designing and fabricating pressure vessels:

1. Design Considerations: The standard outlines guidelines for the design of pressure vessels, including considerations for size, shape, material selection, and corrosion resistance. It also provides formulas and calculations to determine factors such as maximum allowable working pressure, thickness, and stress levels.

2. Material Selection: ISONP23695 details the criteria for selecting suitable materials for pressure vessel construction. It considers factors such as temperature, pressure, corrosiveness of the stored media, and compatibility of materials with fluid properties.

3. Welding and Fabrication: The standard provides specific requirements for welding processes, techniques, and qualifications. It covers aspects such as welder qualifications, pre-welding preparation, joint types, and inspection procedures to ensure high-quality welds that meet the required strength and integrity criteria.

4. Inspection and Testing: ISONP23695 mandates various inspection and testing procedures to verify the quality and performance of pressure vessels. This includes non-destructive testing methods like ultrasonic testing, radiography, and visual inspection, as well as hydrostatic and pneumatic testing to assess the vessel's integrity under pressure.


ISONP23695 plays a vital role in ensuring the safety, reliability, and quality of pressure vessels across industries. By following this standard, manufacturers can comply with international guidelines and avoid potential risks associated with pressure vessel failures. Adherence to ISONP23695 enhances the industry's reputation, promotes trade relations, and most importantly, protects human lives and the environment by preventing accidents and incidents related to pressure vessels.



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