erosion in an automatic recirculation valve

[m56corrod]

Hello All
Do you have any comment about erosion (impingement attack) in bypass orifice inside automatic recirculation valve? this phenomenon has been seen frequently in out BFW outlet.

 

[gerhardl]

Wikipedia has:

http://en.wikipedia.org/wiki/Erosion_corrosion_of_copper_water_tubes

BFW outlet read as Boiler feed water outlet(?) Any suspicion that the picture and cause is different from the wikipedia description?

 

[m56corrod]

Dear gerhardl
thanks for your comment, yes boiler feed water it the material of bypass orifice is ss410 i can send you a picture of attack

 

[LittleInch]

I'm sure when I looked up the details of an ARC, it said one of the issues was that the back pressure on the re-circ line needed to be quite high to prevent this. Sounds like the back pressure is nt high enough to me



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Also: There's usually a good reason why everyone does it that way