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SPECIALTY GASES EQUIPMENT

Central gas supply systems – Perfect match gas related hardware – Maintenance of systems – Legal requirements - Advice – Training – Commercial offers

Gases are usually stored compressed, liquefied or dissolved in suitable cylinders. For withdrawing the gases from their containers the use of appropriate equipment play a key role in order to ensure safety and preserve the quality of the gases.

Messer offers the full range of equipment for any application. We will be glad to support you in finding the optimal form of supply.

Selection of equipment

With Messer’s equipment selection tool the suitable specialty gases equipment can be easily selected.
 

Type of gas

The type and quality of gas basically determine the selection of materials for gas supply equipment.

For non-corrosive, high purity gases up to 6.0 grade and mixtures the use of (chrome plated) brass equipment with metal diaphragms and corresponding sealing materials are recommended. The Messer Spectrolab product line meets these requirements and can be used for all non-corrosive, high purity gases and gas mixtures.

For corrosive gases and sensitive, low-concentration gas mixtures we recommend stainless steel components. On the one hand, it is necessary to protect the equipment against corrosion, and on the other, especially in case of low concentration gas mixtures (low ppm or ppb-range), it prevents the trace compounds from being absorbed by the surface and significantly affecting the composition of the gas mixtures. Sealing materials need to be adapted according to the type of gas. The Messer Spectrocem product line covers all the components for this type of applications.

Cylinder pressure regulator or gas supply system?

In general, there are two types of gas supply: individual cylinders at the point of use with cylinder pressure regulators or a central gas supply system. In case only one application has to be supplied with gas and the cylinder can be placed right next to the point of use, cylinder pressure regulators can be used.  With a central gas supply system, consisting of pressure control panels, pipelines and tapping points at the various points of use, the gas cylinders are safely stored outside of workplaces.

 

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Cylinder pressure regulator

Cylinder pressure regulator

What to choose

Cylinder pressure regulators are mainly used where only one point of use has to be supplied with gas and the cylinder can be placed right next to it. 

The pressure regulator can be directly connected to a cylinder valve. The desired working pressure can be adjusted by means of the adjusting screw. All pressure regulators are equipped with relief valves to protect the connected equipment and two pressure gauges indicating the cylinder and outlet pressure. 

Depending on the level and required stability of the working pressure, one or two-stage cylinder pressure regulators are used. When using a single-stage pressure regulator, the working pressure may increase with decreasing cylinder pressure and has to be adjusted by hand during emptying the cylinder. At low working pressures and high requirements on the stability of the working pressure, dual-stage pressure regulators or pressure regulators with compensated main valve have to be used.
 

Central gas supply systems

Central gas supply systems

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In general, pressurized gas cylinders should be positioned outside of working areas. With a central gas supply the gas cylinders are placed in a separate room or outside the building. The cylinders are connected to a pressure control panel consisting of a pressure regulator which reduces the cylinder pressure to the line pressure, e.g. to 10 bar, pressure gauges for indication of cylinder and line pressure, blocking and purge valves. Fixed pipelines supply the gas to individual points of use, where the gas consumers are connected via tapping points. At the tapping point the line pressure is reduced to the required working pressure. A pressure gauge indicates the current working pressure. 

For continuous gas supply the parallel connection of two cylinders or bundles is recommended. In this case, gas is always withdrawn from one container, with the other one connected on standby. In the simplest case, changeover from one cylinder to the other is done manually. However, there are also pressure control panels available which provide automatic changeover between the containers. Pressure control panels are complete with pressure gauges for indication of the cylinder and outlet pressure. The pressure control panels can be supplied with contact pressure gauges which give a signal if the cylinder pressure drops below a certain preset level. This signal can be passed to a low pressure alarm panel.

Key advantages of a central gas supply are:
•    Safety: No gas cylinder in the working area, reduced handling of gas cylinders
•    Quality: integrated purging valves, pressure control panels and tapping point always form a two-stage gas supply
•    Efficiency: Supply of several gas consumers from one common source, uninterrupted gas supply with automatic changeover
 

Specialty gase page

SPECIALTY GASES

Do you have high standards? So do we! Specialty gases from Messer