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Hiya Keith,
Wire draw is valve "lingo" for describing cavitation effects that
damage a valve seat by a cutting action that sometimes looks like a razor blade
had cut across the seat face. Valve sizing is important ,not only for flow
control, but also to recognize an extreme high differential pressure across the
valve invites cavitation. In valves the high pitched sound is a clue of a
cavitation event. In pumps , it sounds like marbles or gravel flowing
in the volute of the pump.
True about HCL. I do recall the copper pipe appeared to be " rotted" as
well as " shot peened".
We continue to observe " events" in our applied research project in
vortex reactors for seawater pretreatment to reduce mineral content prior to the
filters ahead of the reverse osmosis membranes ( a major DeSal headache). A
bottomless pit where money disappears and results just tantalizing enough to
stay the course. Its good we have no external research funding that requires an
accounting.
Its no wonder Universities become paranoid from explaining " we're
still looking for answers"
Richard
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