THE ESTA ATEX PROGRAMME AND FIRE PROTECTION CONCEPT - FOR A SAFE WORKPLACE
There is a risk of fire and explosion in all industrial installations in which flammable and explosive dusts occur.
Frequently the mistake is made of considering and evaluating the two terms "fire hazard" and "explosion hazard " together. Of course, there are certain influences common to each, but in planning and design they have to be treated separately , because fire protection measures do not prevent an explosion - and vice versa.
We would therefore like to explain the terms "fire" and "explosion" separately here.
A decisive indicator of the possible flammability of a dust and the spread of a fire is the combustion factor. This is classified as follows:
You can find out about the combustion factor from EX Gestis or via a substance analysis that we can carry out for you.
We can offer the following extinguishing options:
- ABC powder extinguishing (possibly D for metals)
- CO2 extinguishing
- Argon extinguishing
- Water extinguishing
ESTA has developed a three-stage safety concept which we tailor individually with the customer. For customer requests that deviate from the concepts, we advise and plan requirements and show the corresponding benefits and disadvantages in advance.
Corresponding decision-making aids for a safety concept can be found in standards VDI 2263 Part 6 and VdS 3445, among others.
The term "explosion" is understood to mean a chemical reaction or a physical process in which temperature and pressure increase considerably in a very short time (a few milliseconds). A sudden volume expansion of gases occurs, along with the release of large amounts of energy in a small space.
The sudden release of energy causes a pressure wave that expands in all directions, whilst weakening. The pressure wave is overtaken after a certain time by the flame front (deflagration).
The prerequisite for an explosion is what is called the "explosion triangle ".
ATEX EXTRACTION SYSTEMS
There is a risk of explosion in all extraction systems in which flammable dusts occur. Under certain conditions an explosive mixture forms in these "Ex-areas" in connection with air. A small spark (e. g. due to static charge) is sufficient to cause a dust explosion.
To ensure that our extraction systems can be configured for explosion protection and ATEX extraction, certain parameters must be known. These include, for example:
- The minimum ignition energy (MIE)
- Explosion limits (LEL / UEL)
- Dust explosion class Kst value
- Grain size
In addition, the extraction system is divided into zones. Here a differentiation must be made between gases and dusts.
EXPLOSION PROTECTION MEASURES
- Ignition hazard assessment
- Check valves
- Flameless pressure relief
- Explosion suppression systems
- System components electrically conductive throughout
- Explosion pressure or explosion pressure shock resistant construction of apparatus
- Creation of an explosion protection document
We perform our services according to the following legal principles:
Do not put yourself and your environment in unnecessary danger! Get ahead with safety - with ATEX-compliant products from ESTA. Our sales consultants work with you to find the right solution. Just contact us!