man! Does anybody come in here? Anyway, I'm pondering hose layout.
Some places I've heard of use something like a couple lengths of 2.5 connected to a couple of 1.75. The way I understand it is this increases nozzle pressure over long layouts. I'm wondering if this might help out my department since we're going to have some industrial occupancies soon. I was thinking a split bed of this and one of straight 2.5. The problem is we don't have the kind of guaranteed water supply some of these places do. We have a few hydrants (flow unknown) and have to water shuttle in other places.
Oh yea, in case you didn't notice, i don't know shiite about hydraulics. It makes my head hurt.
In my dept when we brake down from a 21/2 to 1 1/2 we always use a gated wye in case you want to shut down one line, great in low water cases. For the ref you're looking for look in pumping apparatus driver/operator handbook. What rates are you looking for? A 1 1/2 will flow 125 gpm 1 3/4 175 gpm 2" 200 gpm and a 2 1/2 25o gpm. Hope this helps.
If you are talking about the flow rates of the hydrants in your area, there is a tool for determining that. I cannot remember what it is called, but it is a guage of some kind. How do I know? My husband had to do the hydrant flow pressure test in his FireFighter 1 or 2 IFSAC Skills test. He'd never seen the tool till then! Fortunately for him, he's a brainiac and figured it out on the spot, because he had briefly read over the skill sheet before going to the testing site that day!