Technical objectives of gassing and degassing

The technical objectives of gassing and degassing processes can be divided into several core requirements:

• Uniform gas distribution and discharge

• Reproducible mass transfer conditions

• Avoidance of local flow peaks or gas bubble formation

• Process stability with changing operating conditions

In industrial applications, gassing and degassing elements must also be permanently resistant to the medium, temperature and chemical stress. At the same time, the integration of these components must not unnecessarily complicate the existing process.

Porous sintered materials offer a robust, low-maintenance solution for this, as they combine gas flow, distribution and diffusion in one component.

Basic technical principle of gassing and degassing

Gassing and degassing elements made of porous sintered materials act as a defined interface for gas exchange. They allow gases to be introduced into or removed from a medium in a controlled manner without creating localized flow leaks or local gas accumulations. The technical approach is not based on active components, but on the targeted use of the porous structure of the material.

Porous sintered materials have a network of interconnected pore channels. This structure distributes the gas flow over a large number of small outlet or extraction areas. This creates a uniform gas flow over the entire active surface of the component.

Importance of porosity and component geometry

The porosity of the sintering material determines the gas permeability and the required differential pressure across the component. Wall thickness and geometry also influence the distribution of the gas flow. By combining these parameters, gassing and degassing elements made of porous sintered materials can be specifically adapted to different requirements.

SIPERM® sintering materials are available in various material variants and porosity classes for this purpose. The components take on a clearly defined function within the process and do not actively intervene in the control.

Central applications of gassing and degassing

Gassing and degassing elements made of porous sintered materials are used in industrial applications where gases need to be supplied or removed in a controlled manner. They are used wherever a uniform gas flow is required and selective gas supply or discharge would lead to unstable process conditions, flow disturbances or undesirable gas accumulations.

Porous sintered materials take on a clearly defined, passive function in these applications. They serve as a structured interface for gas flow and allow gases to be distributed over a wide area or removed. SIPERM® components are used in this context as functional components whose porosity, geometry and material are adapted to the respective application.

Gas flushing in technical processes

In gas flushing, porous sintered materials are used to introduce gases evenly into systems. Instead of individual gas nozzles or open outlets, the gas is supplied via a large number of fine pores. This distributes the gas flow over the entire active surface.

This type of fumigation:

• Avoids local gas ingress with high flow velocity

• Reduces pronounced flow peaks in the system

• Supports reproducible and quiet operating conditions

SIPERM® gassing elements are used in technical systems where uniform gas distribution is required and the process reacts sensitively to local flow influences. The components are designed to suit the application and integrated into tanks, modules or assemblies in a suitable geometry.

Degassing of liquids

When degassing liquids, porous sintered materials are used as passive, evenly distributed gas extraction surfaces. They are used for the controlled removal of gases that are already present in the liquid medium or are released as a result of the process. The porous material itself does not cause degassing and does not actively interfere with the process.

The porous structure makes it possible to discharge gas over a large area rather than at specific points. This prevents local gas accumulations or unstable degassing zones. The gas is discharged evenly and supports smooth, stable system operation.

In such applications, SIPERM® sintered materials are designed in such a way that the gas permeability matches the respective installation situation and the gas can be dissipated without impermissible resistance.

Degassing of powders and bulk solids

With powders and fine-grained bulk solids, trapped gases are produced in the spaces between the particles, for example during filling, compaction or discharge. For a stable process flow, it is necessary to discharge these gases in a controlled manner without powder particles being discharged or whirled up.

Porous sintered materials are used in these applications as gas-permeable but powder-dense separating elements. They enable the removal of trapped gases while the powder is safely retained. Degassing takes place over the entire surface of the porous structure and not via individual vents.

The use of porous SIPERM® sintering materials enables the following to be achieved:

• Avoid selective ventilation and dust emissions

• Realize uniform pressure conditions in the system

• Support stable discharge and compaction processes

The components assume a purely passive function and are designed according to the application in terms of porosity and geometry.

Gassing and degassing in technical equipment

Porous sintered materials are used in technical equipment, assemblies or modules for both gassing and degassing tasks. They are often integrated as molded parts or inserts, adapted to the design constraints of the respective system.

By using porous SIPERM® sintered materials, gas flow functions can be integrated into existing equipment without the need for additional moving components or complex installations. The function of the components remains limited to the structured gas flow and complements the higher-level process control.

Geometries, designs and integration

Gassing and degassing elements made of porous sintered materials are designed in different geometries in order to adapt them to the installation situation and gas flow task. The design influences the available flow cross-section, the uniformity of the gas flow and the integration options in existing systems.

Porous SIPERM® materials are used as plates, sleeves, tubes or customized moulded parts. Flat geometries are suitable for uniform gas distribution or discharge over larger areas, while cylindrical designs allow gas to be distributed along defined lines or circumferential surfaces.

They are often integrated directly into assemblies, appliances or modules. The porous components take on a clearly defined function within the overall system without requiring additional moving components or complex mechanisms.

Materials for gassing and degassing

The choice of material depends on the medium, temperature, chemical load and mechanical requirements. The material and porosity together determine the gas permeability, service life and application limits.

• SIPERM® R (porous stainless steel) is used for high temperatures, changing loads and demanding environmental conditions

• SIPERM® B (porous bronze) is suitable for applications with moderate temperatures and oily gases

• SIPERM® HP (porous polyethylene) is used for chemically demanding media, low weight and complex geometries

The selection is always application-related and in conjunction with the geometry and installation situation.

Operation, cleaning and service life

Gassing and degassing elements made of porous sintered materials are passive functional elements with no moving parts. This results in stable operation and low maintenance requirements. However, the function is influenced by the medium, degree of contamination and operating conditions.

In applications with dust, powders or oily media, deposits can reduce gas permeability. Depending on the material and installation situation, cleaning measures are possible to restore the original function.

When properly designed and used, SIPERM® components achieve a long service life. Replacement is usually only necessary if the gas flow is permanently restricted or the process conditions change.

Design and customized solutions

The design of gassing and degassing elements is based on the application. The gas volume flow, permissible differential pressure, medium, temperature and design conditions are decisive.

Porous SIPERM® sintered materials enable the targeted adaptation of porosity and geometry. In addition to standard shapes, customer-specific solutions are realized if there are special installation situations or functional requirements.

The aim is always to achieve a consistent, reproducible gas flow that can be integrated into existing systems without changing the process logic.

Technical summary

Gassing and degassing elements made of porous sintered materials have a clearly defined, passive function in industrial applications. They are used for the structured supply or removal of gases via an evenly distributed porous surface. This prevents localized flow effects, local gas accumulations and unstable operating conditions.

The use of porous sintered materials enables reproducible gas flow without the use of moving components or active control mechanisms. The function of the components is deliberately limited to gas distribution or gas removal and does not interfere with the higher-level process control.

SIPERM® sintering materials are available for these applications in different material variants, porosity classes and geometries. They are designed to suit the application and integrated into existing systems, assemblies or apparatus. The choice of material, porosity and component geometry is made in conjunction with the respective operating conditions.

Typical fields of application include the gassing of technical processes, the controlled degassing of liquids as a passive gas discharge and the degassing of powders and bulk materials, where gases are discharged and particles are reliably retained. In all cases, the focus is on uniform, stable gas flow and a robust, low-maintenance design.