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Darwin Designer considering fire flow?

Hello,

I am working on darwin designer for WaterGems V8i (select series 5). i am having a problem how to design the system under fire flow condition?

it is required in our project to consider all junction as fire nodes . and when i try to use demand adjustment it gives me over estimated pipe sizes and fails in feasibility check.

question 1 : how to consider fire flow for all nodes in darwin designer?

question 2 : i have classified the pipes in 3 design groups (Trunk, main collector and branches) would that give me an appropriate design results? should i imply more design groups?

question 3 :  i have used customer meters demand in some projects as update for select series 5, now i have a problem using darwin designer for those files as it does not consider customer meter as demand in the mode. how to handle this? 

note: i don't have the access to the latest select series patch update.

thanks