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What ıs a central  extractıon and fılter system?

These are systems used to filter various fumes and dusts with a fan + filter group located inside or outside the working environment.

What are the types?
Different types of installations are possible.

Fume/dust extraction and filtration with numerous suction arms

Table suction with multiple bottom suction

Thermal cutting tables (such as plasma, laser)

Wall-mounted smoke extraction units

Ambient ventilation systems (such as push-pull, layered ventilation)

Centralised high vacuum systems for multiple point suction

 

In which cases should centralised systems be used?
This depends entirely on user preferences and technical limitations. In an environment with a large number of welders, mobile units may not be preferred if there is a space problem. Of course, investment and operating costs should be well calculated when making this choice. Centralised systems will generally require more investment costs and a lot of piping.

 

 

What is hall ventilation?
It can be explained as filtering all kinds of fumes and volatile particles that occur in the working environment and returning them to the environment. The biggest problem in the halls where welded manufacturing is carried out is that local suction systems unfortunately do not provide any benefit, especially in cases requiring long welding seams. Local suction arms cannot capture welding fumes after a distance of approximately 30-40 cm. In this case, welding fumes will continue to spread into the hall. Welders should protect themselves by using PPE
Even if they are protected, other workers cannot avoid being exposed to these particles.
For this reason, it becomes necessary to use ‘hall ventilation’ systems in production areas. In halls, where many different systems can be applied, the most effective system is the ‘displacement ventilation’ system, but the installation and operating costs of tubular type displacement ventilation systems are very high and the future relocation or revision of the system poses great difficulties.

 

There are different types:
1. Push Pull systems: Ambient air is sucked in by a pipeline, filtered and then returned to the ambient by a blowing pipeline located opposite the suction pipeline. Not recommended for high thermal loads (annual consumption of more than 10 tonnes of welding wire), ceiling heights of more than 8 metres, spacing between pipes of more than 20-25 metres.

2. Layered (displacement) ventilation: Ideal for areas where a haz-pull system cannot be installed. Suction pipes placed on the ceiling carry the dirty air to the filter unit. The cleaned air is returned to the environment at very low speeds from the floor level.

3. Filter tower: In principle, it works like a layered ventilation system. The biggest advantage is that there is no piping. It is possible to transport it in the hall.

 

Why should I prefer hall ventilation?
Welding fume is rapidly directed upwards due to high heat at the moment of formation.

The smoke, which loses heat, hangs in the range of 2.5 - 5 metres.

The smoke that gets rid of heavy particles continues its upward movement slowly.

The particles scattered downwards rise up again with every air flow in the environment and are inhaled by all workers.

These particles also settle in the eye sockets, skin and hair follicles of the workers.

Welding fumes cause very painful illnesses and deaths in the long term.

If welding fumes contain carcinogenic substances (e.g. nickel compounds or chromium), the air must be exhausted or filtered and reintroduced. (Considering the effect on the environment, filtering is the most appropriate.) The placement of particles is important according to their size and weight. Small particles are suspended in the air with air flow. Very small particles are suspended in the air and if they are not absorbed, they are inhaled and cause severe health problems, even cancer.

 

What advantages does the OHK15 tower offer over its competitors?
Many tower systems are produced based on the displacement ventilation system. What places OHK15 in a different position than all of them is its ‘patent-protected’ double-sided blowing - DBHVS (DualBlowHallVentilationSystem) feature.

 

 

What is DBHVS?
With DBHVS, filtered return air can be returned to the ambient from different parts of the tower or mixed, depending on the user's choice.
Our primary preference is to reintroduce a high percentage of clean air from the lower section of the tower. However, in some special cases, users may want to completely switch off or restrict the bottom blowing. In such cases, the upper blowing can be activated.

 

These special circumstances may be the following: Welding may be required in an area very close to the tower and the bottom blowing may be switched off to protect the shielding gas. It may be desirable to disperse the fog cloud seen at the level above the towers. Top blowing will solve this problem. In special layouts, air curtains can be created by selecting the upper blowing zones of the towers located opposite each other. Thanks to the "Cooperation of Machines" feature, which will be included in our 2nd software version, towers will be able to take the initiative when necessary and open only their upper blowing and direct their blowing nozzles to push the particle density around them towards towers exposed to less particles. In many different special cases, the top blowing option provides great convenience for users. Gas type fire automatic extinguishing system is standard.

What is HiS?
R&D studies have been carried out completely within our company.
The system helps to filter all volatile particles generated in the production areas in a way that prevents them from being sprinkled again and ensures that the ambient air reaches a breathable value.
Each HiS unit has a 1.3 kW EC motor. A composite fan producing a maximum flow rate of 5000 m³/h is available. Nanofibre coated cartridge filters are at least F9 class.
Filter cleaning system is fully automatic. HiS, which absorbs and filters the dirty air in the environment, adapts to the displacement ventilation principle by giving some of the cleaned air back to the environment at very low speeds at ground level.
Part of the cleaned air is blown through the jet nozzles towards the other HiS unit, ensuring continuous mobilisation of the volatile particles.  What value must the ambient air have?
Different values are set as legal limits in all countries. In our designs, we take the German standard of max. 1.25 mg/m³ as a basis and make our designs accordingly.

 

What value should the ambient air have?
Different values are set as legal limits in all countries. While making our designs, we take the German standard of max.1,25 mg/m³ as a basis and make our designs accordingly.

 

HiVent Technology, 16/04/2024, Ankara