Sound attenuating large fan, cyclone, duct - industrial plant

Sound attenuating large fan, cyclone, duct – industrial plant

When a company installed a large industrial milling machine, a fan was fitted to extract oil mist and metal swarf from the machine. No sound attenuating measures were fitted at the time of installation. The extraction system was designed for the fan to blow air and scrap metal through a long duct to a large cyclone, from where the scrap metal falls down another duct into a compacter below. As you can see in the above photo, the cyclone and much of the duct were installed above the factory roof. This means they were directly in line with the bedroom windows of a row of houses opposite the factory.

Unsurprisingly, the extraction system produced very high sound levels at these houses. It was planned to operate the machine and extraction system at night. However, a noise survey showed the extraction system sound levels were 27 dBA above the night-time background noise. This means that a large noise reduction and extensive sound attenuating measures were required to avoid causing noise nuisance. The noise survey was carried out with air only passing through the cyclone, fan and duct. Once the system becomes fully operational such that metal scrap also passes through the system, it is likely that the sound will be considerably higher. The noise from scrap metal rattling around on the inside of the ducts and cyclone can be very loud.

We presented the company with three different sound attenuating options so they could choose their preference depending on cost and ease of installation. Due to the very high sound levels, all options involved extensive sound attenuating measures. Had noise been considered before the industrial fan, cyclone and duct system were installed, it is likely that noise reduction could have been achieved at considerably lower cost. It would also have been much easier to implement the sound attenuating treatment at the same time as the industrial fan, duct system and cyclone were installed.

The sound attenuating solutions that we recommended reduce the noise from scrap metal rattling on the ducts and cyclone interiors as well as from the fan and cyclone. There are various methods that can be used to reduce impact noise from scrap rattling etc. Some information on the best method is given in sound deadening for industrial equipment.

There is much more information about our solutions for sound attenuation of fans, ducts and cyclones on extractor fan noise reduction.

To find out how we can help you with attenuating sound from fans, cyclone separators or any other industrial equipment, ring the number below or contact us.

For help with a noise problem contact us
or call us on 01727 864667