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An Introduction to Sound Level Data for Mechanical and Electrical Equipment

COURSE NO: M03-027
An Introduction to Sound Level Data for Mechanical and Electrical Equipment
Course Highlights

This online engineering PDH course provides sound pressure and sound power data for mechanical and electrical equipment commonly found in many commercial buildings and related infrastructure. Where possible, the noise data have been correlated with some of the more obvious noise influencing parameters, such as type, speed, power rating, and flow conditions.


The noise levels quoted in this course are suggested for design uses; these noise levels represent approximately the 80 to 90 percentile values.  That is, on the basis of these sample sizes, it would be expected that the noise levels of about 80 to 90 percent of a random selection of equipment would be equal to or less than the design values quoted in the manual, or only about 10 to 20 percent of a random selection would exceed these values. This is judged to be a reasonable choice of design values for typical uses. Higher percentile coverage, such as 95 percent, would give increased protection in the acoustic design, but at greater cost in weight and thickness of walls, floors, columns, and beams. On-site power plants driven by reciprocating and gas turbine engines have specific sound and vibration problems, which are considered separately elsewhere.


This 3 PDH online course is intended for mechanical and electrical engineers and other design and construction professionals seeking an introduction to the nature and control of noise produced by mechanical and electrical equipment.

Learning Objectives

This PE continuing education course is intended to provide you with the following specific knowledge and skills:

  • Understanding the significant of A-weighted sound level measurements
  • Knowing the acoustic characteristics of packaged chillers with reciprocating compressors
  • Learning about the noise characteristics of rotary screw compressors
  • Knowing the sound characteristics of packaged chillers with centrifugal compressors
  • Understanding the noise control issues with steam and hot water boilers
  • Controlling unwanted noise produced by cooling towers and evaporative condensers
  • Learning how to calculate sound power levels for propeller-type cooling towers
  • Understanding the typical sound power levels for pumps
  • Learning about the ASHRAE methods for estimating in-duct fan noise
  • Learning about noise control measures that can be applied to compressors
  • Controlling noise from electrical equipment such as generators and transformers
Course Document

In this professional engineering CEU course, you need to review the course document titled, "An Introduction to Sound Level Data for Mechanical and Electrical Equipment".

To view, print and study the course document, please click on the following link(s):
An Introduction to Sound Level Data for Mechanical and Electrical Equipment (948 KB)
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of fifteen (15) questions to earn 3 PDH credits. The quiz will be based on the entire document.


The minimum passing score is 70%. There is no time limit on the quiz, and you can take it multiple times until you pass at no additional cost.
Certificate of Completion

Upon successful completion of the quiz, print your Certificate of Completion instantly. (Note: if you are paying by check or money order, you will be able to print it after we receive your payment.) For your convenience, we will also email it to you. Please note that you can log in to your account at any time to access and print your Certificate of Completion.

To buy the course and take the quiz, please click on: