Skip to main content

Replies sorted oldest to newest

Greetings Akashri ,

Cavitation can form in any type of fluid transfer centrifugal pump .Cavitation occurs when air, steam, or thermal fluid vapors become entrained in the fluid.

Fortunately, cavitation exhibits clear warning signs before it becomes a facility-threatening issue. Some of the symptoms of cavitation include

  • Decreased flow or pressure: When a pump produces lower flow volume or pressures than expected, it may be a result of cavities forming in internal components.
  • Noise: Cavitation may cause crackling or popping sounds in your machinery. Impeller housings experiencing cavitation may sound like there are loose ball bearings rolling around in them
  • Unexpected vibrations: Most pumps and equipment experience some degree of vibration during operation; however, violent or unexpected vibrations may be the result of cavitation.
  • Seal or bearing failure: If you have to replace failed or leaking seals sooner than expected or with greater frequency, then cavitation is a likely cause.
  • Cavitation can occur in both thermal fluid and hot oil systems, and each type has its unique symptoms and causes. A few common types of cavitation include:

    • Vaporization: Also known as classic cavitation, vaporization occurs when velocity increases and pressure decreases, which causes liquid to boil and vaporize in the pump
    • Air aspiration: This type of cavitation results from various issues pulling air into the pump or piping
    • Turbulence: Turbulent flows can happen when design elements like sharp elbows, inadequate piping/filters/strainers, or other flow restrictions within the system create vortexes in pump suction.
RM

Greetings Akashri,

Mr. Kumar is correct in all the above, problem is now you have to determine which one it is and how to correct it. Most of the time I have found it to be a Engineering design issue by Turbulence, improper positioning of elbow, strainer etc.. but the best way I have found to determine this is by using an Ultrasonic leak detector head-set. Using this can help you determine the location of the cavitation then guide you to what you should be looking for i.e. bad pump seals, cavitation in the housing . Best wishes and let us know what you find. Engineers can also design a flow positioner that can be placed inside the pipe to correct flow conditions that have been measured and verified.

RM

Add Reply

×
×
×
×
Link copied to your clipboard.
×