#Product Trends
Plymovent case study at Hamm AG
Optimal employee protection against welding fume
THE CHALLENGE
In the plant of Tirschenreuth the welding takes place in large, undefined working areas. They tried to improve the air quality through roof ventilation, but this led to a high energy loss. The hall is divided into two working areas. Each part is 38 meters long x 20 meters width x 6 meters high.
The extraction volume of each part is 4500 m³. The airflow capacity of the new Plymovent system is currently 54.000m³/h. However the maximum capacity of this system is 60.000m³/h.
THE SOLUTION
We have installed a Push-Pull system with heat recovery and fresh air supply. This system extracts the rising welding fume from the work environment. As a result, the welding fume concentration is well below the MAC-value. To guarantee an optimal longitudinal airflow, 2 U-systems with a maximum capacity of 30.000 m³/h each, had been applied.
To keep the used floor space in the production hall as low as possible, the extraction systems are placed on the outside of the hall under a canopy.
The welding fumes can be captured optimally with the installation of two extraction systems with a combined air flow capacity of 60.000 m³/h. Additionally two fresh air supplier-systems with a heat recovery system and post-heating units are offered to guarantee fresh air exchange even with closed doors and windows during the Winter. The real air intake volume is 12.000 m³/h, this means the indoor air in the plant is refreshed every
hour. The air flow is controlled based on the demand, in other words, a frequency convertor controls continuously the rotational speed of the exhaust fans.
Our filter systems are certified for W-2 and W-3 according to the directives of the German Institute for Occupational Health and Safety. The offered extraction is declared as one according to welding fume category W-2. Here they handle exclusively with steel, so the circulatory air operation may run to 100%.