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Posted by Bob D. on November 15, 2011 at 09:33:10:
In Reply to: LWCO posted by Tony on November 07, 2011 at 15:16:14:
While it's "good practice", I don't think you're going to find it(daily LWCO blowdown requirement) "codified" in either AMSE B&PV Codes (Parts I and IV), NFPA 85, CSD-1, or anywhere else - I certainly have never been able to find it. BUT - Larger facilities may find it listed as a maintenance requirement in their individual insurance policies, or their local jurisdiction rules. Additionally, the LWCO/ALWCO component manufacturer will typically list a 1 year inspection (which coincides with most juristictions' annual inspection requirement for larger boilers) and also a 5 year "teardown" inspection. Simply put, small residential type "probe" type units (<400 MBH), after the initial installation, are "usually" never tested. For larger units, daily blowdowns are nice for keeping scale build-up in the bridle piping minimized on larger float-type units, but an annual test of actually lowering the boiler water level (under close supervision, of course) can still find in-operable LWCO units due to "gumming" up of the float chamber that a blowdown can't clear. Hope this helps. - Bob