250 minutes (4.16 hours)
Time per floor
Total time (hrs) to flush building
Floors x hours
25 hours
hrs per person
Number of floors to flush at one time Number of personnel to complete building in 1 day (8 hours)
3
8.3
3
• In this example the drinking fountains with fountains are the limiting factor – taking about 30 minutes per system to change (including flushing). • Note that these are just estimates for time.
Validate water system by testing for Legionella
• Perform a Legionella test on 2 to 3 cold water systems from different floors as well as the hot water system (tank) and distribution (showers). o This can be done by submitting samples to a local laboratory (like EMSL, or EMLab P&K) note that there is a 10 day turn around for this testing or it can be completed using an on-site test that returns results in 45 minutes. (https://www.spartanbio.com/products/environmental/legionella/) o Cost for analysis of Legionella should be between $100 to $200 per sample
EXAMPLE FLUSHING PROCEDURE
• Flushing process should be performed as follows:
o Start at one end of the floor of the building. o Working in one direction on the floor ▪
Open faucets in sinks to allow continuous flow of cold water or tempered water taking care not to overflow sink or drain • Record date/time starting and location ▪ Systems with dual (hot/cold) handles can both be opened ▪ Run Showers to allow continuous flow of hottest temperature available • Record date/time starting and location ▪ ONCE ALL SYSTEMS ARE FLOWING GO BACK TO INITIAL SYSTEM THAT WAS STARTED • For cold water test free chlorine o Minimum level should be 0.5 ppm as FAC o If level is 0.5 ppm FAC or greater the faucets in that room (e.g. bathroom with three sinks) can be shut off ▪ Only one fixture per “room” needs to be tested for chlorine - all fixtures must be flowing
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