Good day all, it's been a while. I'm still here for you old timers. It appears the traditional 25% drop in residual pressure for satisfactory results has been modified to 10%, '22 edition 4.4.6. I've looked in the committee reports and can't find why. When I look in the enhanced content on Link it talks about 25% still. So now I'm wondering if it's a typo. Anyone have an idea why this changed?
The option to flow system demand appears modified as well in 4.4.7 When conducting a flow test for the purpose of fire protection system design, the flow and pressure results should be adequate for the total demand of the system. Like that's practical for high demand systems, lol. Putting it together does it all mean for fire flow drop 10% and for system design we now HAVE to go to system demand? Chris Cahill, PE* \ Burns & McDonnell Sr. Associate Fire Protection Engineer Phone: 952.656.3652 [email protected]<mailto:[email protected]> *Registered in: MN [A close up of a sign Description automatically generated]<https://www.burnsmcd.com/insightsnews/industries/construction?utm_campaign=CORP_NationalConstruction&utm_source=OutlookSignatures_Web-InsightsNews-Industry-Construction>
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