Belzona for Pump Casing Repair? 1

[CHoff07]

Has anyone had good luck making repairs to a corroded pump case using Belzona?
How long could I expect the repair the last?
What do I need to look out for during the process to ensure long lasting results?

If not Belzona, what's a better method for pump casing repair?

The process is Lean Solvent.

The pump case was corroded but the impeller was in good shape
(Case is Killed Carbon Steel, Impeller is 12% chrome)

 

[micalbrch]

From what I know (heard) it is a good and proven method for coatings/linings. Belzona is not a new company but in the market for many years. But you should look at the costs for repair vs. a new pump housing (perhaps different material). All these repair coatings are not cheap and I think the condition of the corroded pump housing is of importance, too. If there is corrosion only on the surface and everywhere in the housing, it will be a good idea. But if the corrosion already ate up the casting? Not sure if Belzona will be the best choice.

 

[Artisi]

Belzona is a good material for repairing pump cases, I first used it about 30+ years back for repairing worn and damaged cast iron cases from contractor type hire fleet pumps. Repairs were very successful to the point some cases were re-worked again and surprisingly the Belzona was still there but the cast-iron had deteriorated further.
As for the product being pumped - can't comment, suggest you ask Belzona.

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.)

 

[JJPellin]

Belzona makes a variety of products for different purposes and different services. We used Belzona products to make repairs to damaged cases and heads. We use other products to coat new pumps to improve life on these parts or to increase efficiency. It is part of our specifications to coat bowls and columns on new cooling water pumps with a particular product. This allows us to use carbon steel or cast iron and still get very good life from these components.

I would offer one point of caution. The Belzona products may restore the surface and performance to a damaged pump. But, they will not restore the full pressure capability. If there is any doubt about the pressure boundary integrity, I would suggest pressure testing after coating to be sure.

I would expect a good repair to last indefinitely. The greatest risk is that the coating will be undermined by the loss of base material on uncoated areas. If the entire surface can be coated, this can be avoided. This might be easy for a head, but not so easy for a case. I would also caution to be very cautious about getting the coating on surfaces where it is not wanted. Some of these coatings are very, very hard and cutting them off can be nearly impossible. You need to consult with Belzona or a local distributer to understand the hardness, machinability of the different coatings.

Follow the application instructions carefully. Pay special attention to cleaning and priming to get a good bond to the underlying surface. If the surface is smooth, consider an aggressive sand blasting to give it a good profile for the bond. Mix the coating well. Allow the required time for hardening and curing. Curing can be accelerated by application of heat using a heat lamp.


Johnny Pellin