Solutions

These are the sorts of noise sources that operators will detect within 2 hours of installing noisefinder equipment on the laptop.
These are the typical solutions. Typically it is the cumulative effect of a number of noise sources that causes issues

Eliminating Amplification Effect | 8.5 dBA noise reduction

Problem: Hole in a tank

 

Solution: Putting a door to cover the hole.

Tank   Tank

 

Eliminating The Height In Which Water Falls | 15dBA noise reduction

Solution: Installing a chute to facilitate water dropping into the drain.

Tank   Tank

 

Removal of Motor Covers | 5dBA noise reduction

Noise level decreased by 5dBA even though the covers were intended to suppress noise

Problem: Motor Cover On

 

Solution: Motor Cover Off

   
Tank   Tank    

 

Equipment Design | 20dBA noise reduction

Safety guards of the effluent tank motor. This guard produced 95 db of noise. Changing to Perspex guard lowered noise level by 20 db.

 

Plant vacuum room vent. The holes in the vents acted as whistles. Changing the holes to slots reduced the noise level by 15 db.

 

Tank   Tank

 

Isolate pipe work from potential drums | 8.5 dBA noise reduction

Factory walkway:
When pump activated the walkway acts like a drum. Isolating the pipe with strips of rubber reduced noise levels by 15 db

 

Pipes anchored to a polypanel wall caused wall to vibrate and amplify the noise. Isolating the pipe with strips of rubber reduced noise levels by 8 db

 
walkway