The PRESSCON expansion system

One of the core applications for PRESSCON Nitrogen generators is the use in a buffer tank expansion system, where nitrogen is used as the inert gas of choice for blanketing.
The PRESSCON expansion system prevents rust, monitors the water level, and keeps the empty portion of the tank pressurized using nitrogen.

The PRESSCON expansion system monitors and controls the pressure that is present in the expansion chamber of a central heating system.

The system is comprised out of a nitrogen generator with an air compressor, a set of pressure sensors that measure the water level and pressure in a buffer tank and a control module that controls the nitrogen generator.

The central heating systems that are used in the horticulture industry store their heat in a vertical or horizontal buffer tank. The buffer tanks are not fully filled with water but have an expansion chamber above the water.

When looking at a vertical buffer tank the expansion chamber is right above the water inside the tank. When looking at a horizontal buffer tank the expansion chamber is also right above the water inside the tank but it can also be located in a separate expansion vessel. The expansion chamber is intended for the water in the central heating system to expand and shrink when the water is heated up or cooled down. During this process the pressure in the expansion chamber also changes.

The PRESSCON expansion system monitors the pressure in the expansion chamber. When the pressure becomes too high then an overpressure valve relieves the extra pressure. When the pressure becomes to low then the PRESSCON expansion system will produce nitrogen in order to get the expansion chamber pressurized again. The nitrogen generator of the PRESSCON expansion system produces an air mixture with a nitrogen concentration of 99,0 vol. % N2. The system uses nitrogen because it is an inert gas. Inert gasses have the ability to prevent the formation of rust when it is available in a high concentration. The PRESSCON expansion system makes sure that there is always a blanket of nitrogen present in the expansion chamber within the buffer tank and that it is kept at a steady overpressure.

Next to the pressure management of the nitrogen blanket, the PRESSCON expansion system also acts as a monitoring device for the water level in the buffer tank. By using pressure sensors the system determines the height of the water level. Once the water level becomes too high or too low, the PRESSCON expansion system will generate the appropriate fault or alarm messages and can also send a stop signal to other relevant devices.

The water level monitoring is important for the conservation of the buffer tank. It prevents the water level from becoming too high and damaging the roof of the buffer tank. It also prevents the water level from becoming too low which leads to air in the heat injection pipe and in the central heating network.

The nitrogen is generated using our proprietary nitrogen generators, the most energy efficient nitrogen generators on the market.
Nitrogen production is realised by channelling filtered compressed air through a bed of carbon granules (carbon molecular sieve) in the nitrogen generator. The oxygen molecules are absorbed by the carbon granules leaving (almost) pure nitrogen behind. Our units use the most efficient method of producing the nitrogen, which is our proprietary High Pressure Swing Adsorption technique (HPSA-technique)
This new technique is based on the PSA technique completely redeveloped by PRESSCON so that it removes the main disadvantages of the traditional PSA systems.

The HPSA-technique is patented and distinguishes itself through the lower energy usage are well as the longer usage-life of the molecular sieve.

The main advantages of the PRESSCON HPSA system:

  • Up to 50% less energy usage compared to other nitrogen extraction techniques because of lower compressed air usage;
  • Lower chance of downtime and shorter maintenance related downtime because of the modular design, high quality subcomponents and our innovative valves;
  • Low unit operation noise;
  • The system can be configured for both horizontal and vertical storage tanks;
  • Maintenance is easy to carry out because of our modular design, and the end-user can often choose to carry it out themselves
  • Optimal airflow through the carbon molecular sieve cilinders which reduces the chance of CMS deterioration
  • Longer usage life of the carbon molecular sieve and therefore a higher return on investment for the units;
  • The units can produce any desired nitrogen purity level, up to 99,999%;

Would you like to learn more about the HPSA technique? Click here for the full article.

Due to industry leading efficiency rate of our proprietary HPSA technology, the PRESSCON Nitrogen generators, deliver the highest energy efficiency available today.

Because of the unmatched energy efficiency, high reliability and long work life span, the PRESSCON on-site nitrogen production units arguably offer both the lowest total cost of ownership in the market as well as the highest return on investment.

The PRESSCON nitrogen generators are designed from the ground up with reliability and energy efficiency as the core building blocks.
Our unit design is extremely modular and has been optimized in order to also reduce maintenance and subcomponent replacement times. This leads to lower maintenance costs as well as reduced maintenance related downtime.

Our team of engineers also work together with customers in order to determine the optimal maintenance strategy for each individual project.

Depending on the industry and project requirements, PRESSCON can costumize its service plans for the nitrogen generators and compressed air installation.
Some of the possible maintenance strategies, depending on project requirements and redundancy levels are:

    • Time based maintenance – preventive periodic interval maintenance, with preventive replacements according to interval recommendations;
    • Condition based maintenance – taking into account everything from usage hours, system load, lifespans of subcomponents, etc.;
    • Reliability centered maintenance – in situations when the compressed air installation and/or the nitrogen generators are specified in a redundant scheme, the production life of certain subcomponents can be stretched-out with a replacement on failure approach.

Thanks to our modular designs, customers can also choose to perform maintenance themselves while still being able to benefit from our support for both information and necessary parts. This further contributes to a higher ROI because of the lower total cost of ownership.

Advice and custom solutions

All our products are designed, built and tested in our own factory in Honselersdijk and are characterised by innovation, efficiency and quality.
With both design and production being done in-house, our organisation and products have a high level of flexibility.
This enables us to build and deliver custom installations for the specific challenges and requirements of each project, that go beyond our standardised product line-up.

After Sales:

We offer various maintenance models on the basis of an hourly rate or in the form of a maintenance contract, both within the Netherlands and internationally.
We’ve strived to constantly perfect our product design, in order to simplify maintenance operations and we also provide thorough documentation and trainings for customers that wish to do maintenance themselves.
With our 24/7 service department, we support our customers day and night in case of malfunctions.

Would you like to learn more about the Presscon expansion systems? Please don’t hesitate to get in touch with us.

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