×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Pump Casing Cover Erosion

Pump Casing Cover Erosion

Pump Casing Cover Erosion

(OP)
Dear all,

I would like to find the cause of the pump casing cover erode as below picture.

Casing cover & impeller have the same material i.e A 351 Gr. CF8 but casing cover material are eroded, having pin hole & their is no erosion effect on impeller side.

Please let me know the cause.


RE: Pump Casing Cover Erosion

Erosion, probably from recirculation of solids in the pumped material, what are you pumping?

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: Pump Casing Cover Erosion

(OP)
Pumping fluid is clarified warm water in Steel Plant.

RE: Pump Casing Cover Erosion

The damage occurred in that location because of the flow path. Heavy solids that get into that area are trapped. Centrifugal force is spinning them to the outside. The balance holes are close to the shaft. The flow path crossing the backside wear rings is from the OD toward the ID and axially away from the impeller and toward the head (cover). This does not fully explain why the backside of the impeller is untouched. But, I have seen this before. There may be some difference in surface hardness as a result of different processing of pressure boundary parts versus internal parts. But, in any case, the problem is abrasive solids.

We have installed swirl breaks in this area and added hard coatings to resist this problem.

Johnny Pellin

RE: Pump Casing Cover Erosion

I would suggest that the back side of the impeller is relative free from erosion as the solids are being rotated by the impeller at impeller rotation speed, therefore no impingement on the impeller.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: Pump Casing Cover Erosion

If there is a decrease of Flow Rate and Head ?Running properly without Vibration and Noise? How about the other pumps ? I think you have the right to claim .

Heavy-Duty Centrifugal Slurry Pump Manufacturer
www.gempump.com

RE: Pump Casing Cover Erosion

gempump: would you like to expand on "the right to claim" - claim what?

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: Pump Casing Cover Erosion

Artisi:Claim money or a new casing.Some doubt the quality of China’s equipment.

Heavy-Duty Centrifugal Slurry Pump Manufacturer
www.gempump.com

RE: Pump Casing Cover Erosion

gempump: Did you actually read what was the likely cause of the erosion, which has nothing to do with material quality.And why assume this is a Chinese made pump, which by the way has nothing to do with the problem.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: Pump Casing Cover Erosion

Is this pump in cooling water return service from the continous casting section of a steel plant ? - if so, this return water would be full of erosive debris from this plant. May be the operators must have gotten tired of cleaning up the pump suction strainer, and pulled out the strainer element ?

RE: Pump Casing Cover Erosion

OP.-- any idea what the pH is of the pumped liquor?

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources