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Pump Casing Castings

Pump Casing Castings

Pump Casing Castings

(OP)
I am reviewing specs for pump units for a water system.  These are city water (potable water) and approx 50 mgd pumps.  The casings are specified as DI or CI.  Is there a quality standard for porosity and integrity of the casing?  This is not a critical application so I don't think that I can probably use visual inspection methods.  I am tying to define void size or porosity.  Also, if the casing is cracked, I don't want this to be welded and ground unless I know the procedure and stress relief.  
Also, the impellers are cast stainless steel.  I have the same concerns.  
Hopefully there will be no problems but I want to cover my bases if there are.

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