FKZ-FKX THE TRANQUILLITY OF SAFETY

Under certain conditions according to material, dust concentration, air humidity, particles' size and particles' shape, an explosion hazard can arise. It is not possible to predict when the explosion will happen and it is difficult to prevent its happening but, with the FK25 units, it is possible to control the explosion.

A dust explosion is extremely violent and it develops extremely quickly. In most cases it results in severe material damage and a long plant repairing time but in some cases it can also result in personnel's injury. Dust is classified into danger categones St. 1, St. 2, or St. 3; the higher the categories number the more violent the explosion. DANTHERM has developed special filter units to cope with these different categories, so that the explosive forces can be controlled, damage can be minimized and there is the best possible protection for personnel and plant.

Minimising explosion damage

DANTHERM's explosion venting filters (the FKX25 and FKZ25) operate exactly as the standard FK25 filters during normal use, but the filter casing and hopper are manufactured with a much heavier gauge of steel plate. The units are also fitted with explosion relief diaphragms which do not have any mechanical parts.
If the pressure within the filter casing exceeds a pre-set figure, because of an explosion, the diaphragm will break so that the pressure wave from the explosion is vented to a safe area. Thus the explosion is controlled and the consequential damage is reduced to a minimum.

Tested and approved

The FKX25 and FKZ25 filters are designed and manufactured in accordance with the German VDI 3673 standard.
The FKX25 filter has been tested to a maximum pressure of 70,000Pa (0.7 bar) and is one of the very few filters approved for use with St. 3 dusts.

The FKX25 and FKZ25 filters can be fitted with explosion detection systems and high speed dampers if required. These accessories ensure that the filter is isolated from the ducting system in the event of an explosion and reduces the spread of damage.