Air compressors are vital in various industries, including agriculture, automotive, food and beverage, and energy. They power machinery and tools, or can complete key tasks like blowing dust and debris from production lines. However, using them can cause problems, particularly noise. It’s important to consider this as it could be a major hazard to employees. You may need different silencers, including an intake silencer and one for the outlet. Plus, you may have to address structure-borne noise.
Why are they noisy?
Air compressors naturally generate noise because of the rapid pressure changes. It causes waves as they draw in and pump out air. Some models (particularly piston) are worse than others because they don’t have a continuous flow. Newer models like scroll and rotary screw compressors are better, reducing pulsation.
Noise can be much worse with air compressors if there is unbalanced pulsation. This means there are big differences between the pulsations at the intake and outlet. Ideally, you need to achieve a balance so the pulsation is consistent.
You can also have issues here because of design and installation mistakes. In the worst cases, the pipes can become almost like a loudspeaker. The waves cause vibrations that can travel through the pipes, amplifying the noise. You’re more likely to have issues if the pipe diameter and length match the pulse frequency.
What to do?
There are a few different things you can do here to address pulsation noise. Using an outlet and intake silencer can be very useful, especially if you include a dampener on the outlet side. However, keep in mind that they generally don’t tackle structure-borne noise; waves could still travel through the pipes.
An interesting thing you can do is break the mechanical link. Instead of attaching rigid pipe directly to the outlet, you can use a short section of flexible hose. It will prevent the vibrations from travelling through the pipe, reducing noise.
It’s also crucial to make sure you consider the acoustics of the discharge pipes as well as the flow rate. The goal should be to reduce air velocity and pulsation. One way to do this is to avoid using small pipes. Sizing up is better, especially close to the outlet.
Being proactive with maintenance is very important too. One thing to look at is the inlet filter. The filters are important, removing contaminants from the air so they don’t get in the system. However, over time they can get clogged. This reduces the airflow and makes the compressor’s job harder. It can make intake pulsation worse, creating more noise. So, make sure you check and clean them.
Talk to us about inlet silencer designs and more
It’s more effective to think about noise and how to prevent it becoming an issue when you’re designing facilities. You will get much better results here. Notably, specify quieter equipment, especially air compressors. Think about how you can prevent structural-borne noise too. Plus, look at how silencers can help.
If you do need help to design a bespoke inlet silencer for different applications, you can rely on Ventx. We’ve got a wealth of experience from supporting clients in various industries. So, you can rely on us to give you outstanding solutions. Get in touch today and let’s get to work.
