Standard version in stainless steel
Chemical vessels
Standard version in stainless steel
For 3 and 6 litres with round hole sight glass or with oblong hole sight glass for 6 and 12 litres. All stainless steel design. Vessels and fittings are free of non-ferrous metal, aluminium, steel or zinc, except for special fittings on customer request.
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For aseptic production processes with no dead spaces in stainless steel
Sterile vessels
For aseptic production processes with no dead spaces in stainless steel
There are no dead spaces where germs can accumulate. Interior with spigots and weld seams ground to Ra 0.6 µm, electropolished inside and out. Two-part vessel with round sight glasses in sterile design and sterile screw connections for fittings. All stainless steel design.
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Construction, design and instrumentation according to customer specifications
Customised vessels
Construction, design and instrumentation according to customer specifications
The AX 219 ZS was developed for applications that require a high degree of automation – a 12-litre vessel that can be equipped with a wide range of measuring and control devices. For a more detailed specification of your barrier pressure vessel, please print out the corresponding PDF, fill it in and fax it to +41 61 811 12 11 or send it by email to info@aerni.com.
Aerni barrier pressure vessels
Aerni sterile barrier pressure vessels
Construction, design and instrumentation according to customer specifications
Sealing systems
Construction, design and instrumentation according to customer specifications
For lubricating and cooling chemical apparatus. A pressure reducer and float valve regulate the fluid level in the reservoir. Self-priming pumps. Measuring devices for plant monitoring. ATEX-compliant components. Sturdy stainless steel structure.
In-house development by Aerni
Manual refill pump
In-house development by Aerni
Made of 1.4404 stainless steel for various applications:
– Refilling of barrier fluid in barrier pressure units during operation
– Lubricating of plunger bearings and glands
– Adding of chemicals in pressure reactors
Aerni barrier pressure vessels are used in the chemical, pharmaceutical, cosmetics and food industries to store, maintain pressure and cool barrier media in a sealing loop. The vessel and, if available, the fittings are made entirely of stainless steel. Aerni guarantees the quality of the manufactured products and carries out the necessary approval tests. Aerni also offers the construction of prototypes in order to extensively test and optimise the function in the real process.
functional principles
Two different types of systems, thermosiphon and forced circulation systems, are used to circulate the barrier fluid. The mechanical seal performs a different role depending on the system.
THERMOSIPHON
Gravity circulation
In the case of the thermosiphon or gravity circulation, the circulation functions on the principle of the temperature differences in the inlet and outlet of the barrier pressure vessel. The cold sealing medium flows into the mechanical seal. Once there, the medium heats up and flows back into the barrier pressure vessel via the return pipe, where it cools down again at the heat exchanger and flows back into the mechanical seal. Thermosiphon systems work with pressurised gas overlay to ensure a defined differential pressure across the mechanical seal.
principle
PDF Scheme
circulation
Gear pump and air filter
With forced circulation, the sealing medium is circulated via a gear pump. If the sealing pressure vessel is operated without pressure, an air filter must be fitted at the compressed gas connection so that no vacuum can develop in the vessel. In addition, a diaphragm or a pressure relief valve must be installed in the return line to maintain a defined differential pressure above the mechanical seal.
Differential pressure in case of power failure
In the event of a power failure (no forced circulation), there would no longer be any differential pressure, so a pressurised gas overlay is recommended in any case. The differential pressure across the mechanical seal can thus be maintained for a longer period of time in the event of a power failure, provided that the mechanical seal does not have a leak.
operating principle
PDF Scheme
Aerni barrier pressure vessels are used in the chemical, pharmaceutical, biotechnology, food and cosmetics industries for storing, pressurising and cooling barrier media in sealing loops with mechanical seals.
Aerni barrier systems
Quench and seal vessels
Dripping fluid vessels
Thermosiphon systems
Thermosiphon chemical vessels
Forced circulation systems
Pharmaceutical vessels
Hastelloy vessels
Manual refill pump
Accessories and spare parts
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daniel.mueller@aerni.com