Technical requirements for inerting elements

Inertization places specific requirements on the gas distribution elements used.

Even gas distribution

The inert gas must be introduced into the system as homogeneously as possible in order to avoid local oxygen residues or concentration differences. Selective gas supply often leads to inefficient displacement and increased gas consumption.

Reproducibility

Inertization must lead to comparable results under the same operating conditions. A defined pore structure supports uniform gas release and stable process conditions.

Mechanical and chemical resistance

Depending on the application, elevated temperatures, chemically contaminated gases or changing pressure conditions may occur. The porous materials used must remain permanently functional under these conditions.

Differentiation from related applications

Inertization must be clearly distinguished from other gas-related functions:

• Ventilation is used to equalize the pressure without specifically changing the gas composition

• Forming protects localized areas, e.g. weld roots

• Explosion protection fulfills safety-relevant protective functions and is subject to normative requirements

Inerting is a process-active measure aimed at the controlled creation of a low-oxygen atmosphere.

Suitable SIPERM® materials for inerting applications

For inertization tasks, porous materials are used that enable the uniform and controlled introduction of inert gases into a system. The decisive factor here is not the local protective effect, but the homogeneous setting of a low-oxygen atmosphere over a defined volume.

SIPERM® R – porous stainless steel for inertization

Porous stainless steel is particularly suitable for inerting applications where thermal, mechanical or chemical loads occur. The porous structure enables gas to be released over a wide area and supports the uniform displacement of oxygen from the system.

SIPERM® R is preferably used when:

• increased temperatures are present

• chemically contaminated process environments occur

• reproducible inertization conditions are required

The stable pore structure allows continuous operation with a defined gas flow rate.

SIPERM® B – porous bronze for moderate inerting conditions

Porous bronze can be used for inerting applications where moderate temperatures and loads are present. The homogeneous pore structure supports uniform gas distribution and is suitable for applications where there are no increased safety-related requirements.

The choice between stainless steel and bronze is based on the application and takes into account the temperature range, process conditions and installation situation.

Typical designs and installation situations

Porous inerting elements are realized in different geometries in order to adapt them to the respective application. Typical designs are

• porous pipes for the extensive introduction of gas along a volume

• Porous plates or sheets for even gas distribution

• Customized moulded parts for integration into containers, reactors or system components

Uniform oxygen displacement is achieved and inert gas consumption is optimized thanks to the extensive gas release.

Differentiation from explosion protection

Inerting is used to create a low-oxygen atmosphere as part of the process. It must be clearly distinguished from explosion protection, where safety-relevant protective functions are the main focus and normative requirements must be taken into account.

While inerting is often part of a process concept, explosion protection is designed as an independent safety measure.