When are dangerous chemicals during plasma cutting?
During the plasma or gas cutting process, many dangerous chemical compounds are formed – gases and dust. Appropriate handling from the cutting zone is one of the most important elements of the thermal treatment process. It significantly affects the safety of the operator serving the plasma-gas cutter, but also all employees staying nearby.
The years of experience of machine manufacturers and their users have shown that the most effective and safest solution is a material table in the form of a subtitut table. Despite this, two, completely different types of material tables can be found on the market:
- dry tables with extraction (only effective),
- Water tables.
Why are water tables not a safe solution?
Water tables are a cheap solution in production, which is why they are very popular among the producers of budget machines. However, they do not meet strict safety standards, e.g. ISO 17916. During cutting, gases and dust are produced. Harmful gases are not absorbed by water. They get to the production hall – they are deadly for machines and other people located there.
The main problems of using budget water tables are:
- Utilization of contaminated water, which in addition to dust contains poisonous chemicals. After filling the table, it becomes hazardous waste. It hinders and significantly extends the cyclical maintenance of the machine.
- The effectiveness of dust and gas retention is questionable. The dust resulting in the cutting process, in contact with water, will stop inside the bathtub. Gaza, on the other hand, will only be associated with those that react with water. However, this also gives birth to danger – for example during aluminum cutting, the combustion product reacts with water, causing the formation of hydrogen, which is explosive,
- Condensation of water vapor during the cutting process. The processed material hot to several hundred degrees causes water to evaporate under the sheet sheet. This drastically accelerates the process of corrosion and rust formation not only of the cutter and its components, but also devices around the hall. High humidity in the hall negatively affects the comfort of operators’ work on warm days.
What are the types of material tables with “dry removal” of gases and dust?
Stigal designers have ruled water tables from the beginning. They faced the problem of creating an effective exhaust gas and gases system. In the case of dry material tables, they had to choose from:
- material table with mechanically opened extraction sections,
- Material table with electronically opened extraction sections.
The material table with mechanically opened extraction sections has an element in its construction, which mechanically launches the appropriate subtitut section, strictly coupled with the position of the burner. If the cutting operation is performed above one section – this does not give rise to problems. However, when smoking in several sections, the portal, moving over the next part, closes the previous one. In this situation, the gases are not effectively pulled out and are thrown into the production hall, causing danger.
Why was ECTS created and how does the electronic control sections in the material table work?
The broad analysis of the mechanical method of opening the section has contributed to the creation of the idea of ECTS – an electronic exhaust gas extraction system, which works on a principle controlled by signals of opening and closing individual sections. The programmo -set mechanisms of modules mean that even if firing is no longer made in a given area, the module under this place is still open and the gases are transported to the filter -set or fan.
Only when the cutting over another pull -out section is closed. In addition, when using a filter unit equipped with a spark separator, we can minimize the possibility of ignition of the filter -wire components almost to zero, and at the same time clean the air almost entirely, which goes to the atmosphere.
Which exhaust gas extraction system should you choose with fast plasma burns?
In the case of tables with electronically controlled sections, there is no danger of closing the not fully cleaned table section, even with dynamic machine passes. As in the case of working on the borders of individual modules – then both sections are also cleaned – not only the one that the burner is working on.
With mechanical systems, the “common part” is constant – it is not possible to expand the place where both sections are opened. At the tables with ECTS, the place between modules and the common field area can be widely expanded and thus optimized the process of cleaning the flue gas from the tables.
Do the Stigal ECTS extraction tables meet strict standards?
Thanks to the use of electronic control, the distracting sections in the material table, tables designed by Stigal designers meet the rigorous safety standard, i.e. PN-EN ISO17916, which accurately describes the method and values that should be met to make the cut safe. The table itself, however, is not able to properly drain the gases – that’s why we offer the appropriate fan or filter -set in our offer, which will be effective for the ordered size of the work table.
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