Safety valves for technical gases

Efficiency as a basis for the process industry

Technical gases are just as important in industry as water and electricity. Efficient and safe processes must be guaranteed from the production of gases in the air separators to transport, storage and processing of technical gases.

Your critical system-relevant components must function reliably over the entire life cycle and ensure simple and predictable maintenance. Particularly worth mentioning are the low-temperature and oxygen applications with strict requirements for material selection and freedom from oil and grease.

A plant for technical gases contains many safety valves of different sizes. These range from small valves for thermal expansion to large XXL valves for the initially high volume flows. Here, the tightness for the efficiency of your plant is crucial.

Technical Gases - Products

The LESER Advantage

LESER supplies safety valves for all applications in handling technical gases. Stainless steel valves form the basis for all low-temperature applications, while Monel from the LESER Alloy-Concept also covers critical oxygen applications. Audited and certified cleaning processes for freedom from oil and grease demonstrate the competence of LESER. With the Nanotightness concept, LESER clearly exceeds the tightness requirements of API 527.

Thanks to a high degree of automation, clever warehousing and a large number of regional warehouses, LESER offers short delivery times.

Case Study

Bottom Up Valves at Aerzen.

Industry/Application:

OEM for different industries

LESER Solution:

High Performance and API

The challenges
As an internationally operating OEM Aerzener Maschinenfabrik has to fulfil a many local, legal requirements as well as customer specifications, of e.g. pressure equipment. Every region has its own set of rules: For example in Europe applies the pressure equipment directive and in America the ASME Code. In addition to the general requirement for global approval concepts, e.g. for pressure equipment according to PED or ASME, the trend among companies is towards modular systems. Planners are trying to use small, linkable systems in order to be able to work flexible and scalable. This makes it easier to coordinate plant capacities. This modularization considerably limits the installation space and freedom in the design or development of e.g. compressors.

In addition to the small installation space of the above-mentioned compressors, they should be completely covered by an acoustic enclosure to reduce noise emissions. In order to reduce the size of the very cost-intensive sound enclosure, AERZEN requires special valves that are adapted to the available small installation space. Compressors are discontinuous machines for pressure generation.
In order to ensure that occurring pulsations do not impair the function of the safety valve, the set pressure of the valve is adjusted accordingly and an appropriate distance to the pressure line is ensured by design.

The LESER solution
As a renowned manufacturer of safety valves, it is advantageous to be able to react flexibly to the above-mentioned concerns, primarily to the small installation space, with its portfolio. Being able to change the installation position of safety valves is a clear advantage for the compressor designer. They are much more variable in their design and construction options and can also respond more flexibly to special customer specifications. If the progressive modularization of compressors requires more compact designs, safety valves in different mounting positions, for example, can be an answer to the problem, unlike the classic upright position. In addition, the spindle guide plays a special role here. The friction at the guiding points must be reduced as much as possible so that the spindle runs smoothly. Otherwise, a safety valve can only be installed vertically.

Why LESER safety valves?
For a global acting OEM like AERZEN, a specialist like LESER, who has not only the knowledge but also the necessary approvals, is an important component for success. LESER offers a global approval concept that allows safety valves to be used regardless of location. When ordering safety valves, only the applicable regulations must be specified in order to ensure appropriate labeling and material selection. In addition, LESER has tested and approved further installation positions in addition to the conventional installation situation, standing on the inlet pipeline. For example, some types of valves may be installed with a horizontal stem or even upside down, e.g. Types 526 and 441. For horizontal installation, care must be taken to align the outlet. Liquids, e.g. in the form of condensate, should be able to drain off downwards to avoid back pressures and even corrosion. When installed upside down, the inverted weight forces are corrected by correction factors. LESER offers not only safety valves with basic documentation and accessories but also other special documentation and options. From the “Fugitive Emission Test” with helium up to 3.2 ship class castings and from back pressures up to more than 200 bar-g to high pressure heating jackets for up to 30 bar-g, LESER sales engineers develop solutions for customer specific applications as described above for AERZEN.

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