School Kitchen Pre-Rinse and Wash Sinks

Art, I don't know if you could still use the information, but the new Version 4.0 of the form does not require a duration or daily uses number for the pre-spray valves. It is just a check that you have less than or equal to 1.6 gpm and you don't have to worry about the duration, number of uses, etc. However, if you were using an older template like I was and had the following footnote to Table Flow Fixture Data, "a reasonable estimate MUST be provided for pre-rinse spray valves when selected in the table above," you would have wanted to enter a value. I found a Lawrence Berkeley National Lab study that seems reasonable for the pre-rinse spray valve: http://www.osti.gov/bridge/servlets/purl/962727-n3Dp1W/962727.pdf. This suggests schools use the valve 2.2 - 4 hours per day. On the kitchen sink, I was just using the default of one use per FTE and 15 sec duration. I really hope they will get these forms settled - just in time for 2012. :-/

Sonrisa - you are correct, the v4 form has been updated to reflect the LEED Reference Guide for Green Building Design and Construction, 2009 Edition (Updated June 2010) 11/1/2011 Addenda, which clarifies that for projects with commercial pre‐rinse spray valves, there is no longer a baseline performance standard from which to claim savings; rather, the prerequisite requires only that the flow rate comply with the ASME A112.18.1 standard of 1.6 gpm or less.