Noise from pumps is disturbing and annoying and can be from small domestic pumps to much larger industrial pumps but the soundproof solution to lower the noise is virtually the same regardless of size. Small domestic pumps is one of the biggest noise problems often encountered and because these are usually used for domestic water for taps or showers. These pumps are usually high speed so they can create a lot of noise that is both airborne and structure borne. Airborne noise is the type of noise more easily heard when you are nearer to where the pump is sited. Structure borne sound is when you can still hear the pump regardless of where you are in the building. As the term suggests, structure borne sound is sound that is transmitted through the fabric of the building so the building is acting as a channel for the noise. Now for the solution to soundproof a small domestic pump by enclosing it in an acoustic enclosure that is easily built by anyone that is handy with small tools. It is also important that the correct materials are used to obtain maximum soundproofing performance and the these will be explained as you read on.
Positioning of the pump is important and should be carefully planned before installation and is particularly important with domestic pumps so they can more easily soundproofed. A pump that is fitted beneath a bath, in a small cupboard or similar enclosed space cannot effectively be acoustically treated. Positioning in a loft or a large cupboard with lots of space around the pump will be much better and will more easily allow the pump to be enclosed within a soundproofed box..
A concrete slab should always be used as part of the set-up which will contain much of the vibration energy the pump will emit. The slab can be a paving slab or a simple patio slab depending on the size of the pump. The slab should be isolated from the ground or floor with our 10mm anti-vibration pad. These AV pads are produced from recycled EPDM rubber and help reduce structure borne sound from travelling to other parts of the building. Another anti-vibration pad with a 12mm ply board glued on top should be bonded to the top of the slab. The pump can then be screw fixed to the ply as normal. Flexible hose connections should always be used to connect the pump to the plumbing and will further reduce flanking noise through the pipework. Now the isolated pump has to have a soundproofed enclosure around it to help contain the airborne noise. 18mm MDF or ply can be used and the box should be built as large as possible. The bigger it is the more efficient the soundproofing will become and less likelihood of the pump overheating. The inside of the enclosure should be lined with our 32mm SA25FF/B/6 soundproofing foam and that’s it, job done! Except if ventilation is required, this can be through passive vents, one on each side allowing a throughput of air. The vents must be created so that there is no direct line of sight into the enclosure and the inside of the vents should also be lined with the same soundproofing foam used to line the inside of the enclosure. For more information on pump soundproofing, go to our web page on the subject on www.soundservice.co.uk