Scheuch is constantly striving to minimise noise generation and the emission values resulting from this by developing innovative filter and ventilation technology as well as lower-noise designs. Some applications, however, still require secondary sound reduction methods.
As there will always be some circumstances under which sources of ignition are likely to arise, it is never possible to rule out the risk of explosion altogether. That is why it is necessary to introduce measures that restrict the impact of an explosion once it has occurred and reduce this to an acceptable level.
Sound insulation measures
These reduce sound penetration at sound-emitting components such as fans, filters, piping, drive units, etc. Insulation is achieved through encapsulation in the widest sense of the word: for example, using insulating cabins, housings, insulating shells, or the insulation of pipelines and the filter housing.
It is then applied in cases where openings leading to sound-generating components cannot be avoided – in pipeline gas streams, for instance. Pipe and sliding block absorbers are used: these are generally formed by placing absorber material in a silencer housing, whose porous structure is used to extract energy from the sound that arises. Resonators are a special type of silencer and are recommended for use in cases where low-frequency noises are present.
These measures include vibration dampers, piping compensators and plate-type resonators in fans.
Techniques such as explosion-proof or blast-proof construction can be employed as a means of minimising the damage that could potentially be caused by explosions. In addition, the following safety precautions should be considered:
Pressure can be released to the outside area using rupture discs or explosion flaps.
Another option for preventing excessive pressure increases inside machinery is explosion suppression. This uses a detector system that is able to detect an explosion in its earliest stages and then quickly introduces an extinguishing agent into the area requiring protection.
Decoupling measures should be implemented in every plant to prevent an explosion that has already begun from advancing to and causing destruction in one or more additional areas of the plant. Such steps include technical explosion-protection measures to decouple piping using pressure relief pipes, flame barriers, fast closing slide valves, and Ventex valves or rotary valves.
Heat insulation may be required for safety reasons, providing protection against accidental contact in cases where surface temperatures are high – but it may also be a necessary part of the processes that take place in the system. Its purpose is to prevent heat and/or energy losses. Differing requirements have resulted in designs varying widely in insulation thickness and insulating material.
To protect heat and sound insulation against mechanical or environmental influences, sheet metal casing made from aluminium or galvanised/stainless sheet metal is used, depending on the requirements of the application.