Devcon epoxy repair on case ring bores and case cut water.

[Mech5656]

Hello,

We have a pump case used in condensate/steam application (250F) and has eroded ring bores and cut water area (see attached)

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I am planning to use devcon steel plastic epoxy to repair it by applying and hand blending/grinding. Do you have experience with it? Have you tried it and what was your experience with it? Thanks!

 

[TugboatEng]

Be weary of hardware store epoxies. Most are limited to 120°F MAX in water service.

Belzona is the world standard for epoxies for this type of repair. If you can swallow the price, they'll most likely recommend their 1111 product to replace any lost material and 1341 to coat the casing to prevent future erosion. If cavitation is the cause of erosion they also have rubber based products such as their 2141.

 

[itsmoked]

What happens if the epoxy repair fails and chunks of it come off and move thru the system? Is that a problem?

There are services that do metal spray repair. I'd check with them.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Artisi]

How about remaching the wear ring location and having oversize (OD) wear rings manufactured, possibly the stuffing box could remain as is or Devcon the corrosion, the cutwater should be ok for Devcon.

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.)

 

[EdStainless]

Either have it built up with metal spray or machine oversize.
For little stuff you could fill, but not large areas.
My favorites are

https://www.3m.com/3M/en_US/p/c/adhesives/structural/one-part/

These are B stage pastes, most of them cure at 250F and they are 100% solids.
We used 2214 HT in wet service at 250F and it worked well.

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P.E. Metallurgy, consulting work welcomed

 

[quadtracker]

Normally the metal areas in the pump casing are built up by an approved welding process from the manufacturer, then those areas are machined back to original manufacturer's specs and the cutwaters are hand ground to approved form. There are pump repair companies that can and do a professional job.

 

[Mech5656]

I used the devcon epoxy and the machinist machined the bores back to size on horizontal boring machine. Thanks to all for your feedback.

 

[TugboatEng]

For this repair to work you need to machine and grit blast the bores prior to application of the epoxy. As it is now the epoxy is too thin and will peel do to insufficient strength. This repair will fail.

Epoxy isn't supposed to be a cheap fix or it would be used preventatively during the initial manufacture. Correct application of epoxy is an expensive and time-consuming process.