What is the Module G Standard?

Module G is one of the modules defined under the European Union New Approach Directives that is based on unit verification of conformity. This module is applied particularly to pressure equipment that is custom-made, manufactured as a single unit, or produced in small batches.

In this context, the following are performed:

• Individual product inspection,

• Product-specific design review,

• Mechanical and pressure tests,

• Non-destructive testing (NDT),

• Comparison with the technical documentation,

• Traceability verification

are carried out.

Module G requires each individual product to undergo a conformity assessment independently.

How is a Module G Certificate of Conformity obtained?

The Module G conformity process is carried out through the individual examination and testing of each product.

The process generally consists of the following stages:

• Examination of the technical file,

• Evaluation of the product design,

• Verification of material and production information,

• Performance of pressure tests,

• Performance of mechanical strength tests,

• Visual and non-destructive inspections,

• Product-based conformity verification

Upon successful verification of conformity for each product following the evaluation, a Module G conformity certificate is issued.

Why is Module G applied?

Module G is applied to verify the safety of each individual piece of equipment, particularly for products that are non-standard or require custom manufacturing.

Reasons for applying this module include:

• Verifying the safety of individual products,

• Controlling custom-manufactured items,

• Ensuring a high level of safety for pressure equipment,

• Supporting CE conformity processes,

• Preventing design and manufacturing errors,

• Ensuring compliance with European Union regulations.

What are the application areas of Module G?

Module G is applied particularly to pressure equipment requiring custom design and one-off production.

Primary areas of application:

• Custom pressure vessels,

• Prototype equipment,

• One-off boilers,

• Special engineering projects,

• Specialized chemical and petrochemical systems,

• Specialized equipment for power plants,

• Custom-manufactured pressure products.

Equipment and Techniques Used Under Module G

Under Module G, each product undergoes individual testing and inspection processes.

Equipment and techniques used:

• Hydrostatic pressure testing devices,

• Mechanical strength testing machines,

• Non-destructive testing (NDT) systems,

• Spectrometer analyzers,

• Dimensional measurement equipment,

• Visual inspection systems,

• Technical file verification methods.

These methods are used to independently verify the conformity of each product.

Module G Advantages

• Ensures the individual verification of each product.

• Contributes to a high level of safety.

• Provides assurance of conformity for custom productions.

• Supports CE processes.

• Minimizes design and production errors.

• Maximizes traceability.

Disadvantages of Module G

• It requires a separate testing process for each product.

• It can extend production time.

• It can increase costs.

• It increases the need for operational planning.

Nevertheless, Module G is one of the most reliable conformity verification methods, particularly for high-risk and custom-manufactured pressure equipment.

Contact us

You may contact us for detailed information regarding the inspection and conformity assessment activities carried out under the Certificate of Conformity based on Unit Verification (Module G).

The processes conducted by our organization are carried out in accordance with European Union conformity legislation, and we provide services for the individual product-based verification and testing of pressure equipment.