First lets ignore that there have been a boat load of BFP installed
downstream of black steel without hearing anything form the mfg's.
Since it is a typically installation and has been for years, I'd think
the mfg's would have put something on their cut sheets.
Heavy metals is certainly one of the reasoning for requiring a BFP to
isolate the black steel from the domestic water supply. Since the
fouling of the checks are heavily impacted by the water environment of
the track or poppit guide and these components for the system check
are exposed to the heavy metals without a problem, why would exposing
the bottom of the supply side check to such water be a problem?
It sounds like someone is prepping the fields with a little natural
fertilizer.
Roland
On Jul 2, 2008, at 9:54 AM, Mike Wisneski wrote:
As far as I can tell, this is driven by the head backflow guy at the
WP. He
says that the metals etc that leach out of steel sprinkler piping will
eventually foul the RPZ and cause it to fail. How about you backflow
manufacturers and suppliers. Is there any basis for that belief???
Mike Wisneski
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