GPM question on LDH - NST adapters
My dept. has been finally putting LDH in service. The current method to feed it on one engine is to connect two 25' 3" (w/2.5"couplers) lines to a Y -4" Stortz adapter. Works OK but a bit cumbersome. I have been looking at changing one of the pump outlets over to a 4" line to the rear (It's a Century ALF with a 2K pump so the capacity is there and I think it has a blocked outlet on it that is 4/5 in on top of the manifold)
BUT I was also talking to a couple of other departments that have just screwed adapters right onto the 2.5" lines and claim they get just as much flow.
Somehow I doubt that since your limiting the flow through the 2-3" pipe running through the rig, But how much of a reduction is it? That is the number I can't find. I know in most of the pump classes they claim reductions of flow for appliances but most of those are for same sized line. (IE 2.5 feeding a twin 1.5Y)
Using flow calculations I get all screwed up because the distance is only 8 feet.
Anyone want to come up with a real answer before I cut and gut the rig ??