Alright everyone, I've got a phire ground fysics problem for ya'll, or something like.
Ok, lets say some time ago a small department on an island out on the pacific coast of Canada, lets say, The Halamat Fire Department, bought itself a portable pump that they had mounted and plumbed into their tanker. The system worked fairly well as the pump was able to fill the 3300 gallon tank in 14-16 minutes. The only problem being that this here portable pump, when it was ordered and showed up on the Halamat, came with some spare head gaskets... never a good sign... Anyway, some time later, lets say about a month ago, this pump basically has a core meltdown. Another pump is purchased to replace it, a nice little (large) Honda. It moves 508 gallons a minute and has 4inch plumbing. The old pump had 3inch, so the tanker is going to have to be re-plumbed from scratch.
Ok, here is where we get phyisical:
The pump is mounted lower then the tank, therefore, the plumbing goes up into the bottom of it. Taking into account friction lose and the gravitational force of the water it is pumping, and all that happy number stuff, what would be effective,
1) plumbing the 4inch to the bottom of the tank
2) plumbing the 4inch up through the tank near the top
3) Something we have not considered
See below for details:
Concerning #1, would the pump be working harder because it has the entire volume of the tank to pump against, vs #2 has only the volume of the pipes?
Would the friction loss on the longer pipe (#2) be more then the fluidic friction loss in #1?
Would the gravitational force from the water against the pump be more in the pipes (#2) because of it's volume and height VS #1 volume and height of the tank?
So, are we, I mean the Halamat Fire Department, totally out to lunch on all of this? We basically want to set up the best system we can in order to use the full capacity of the pump and, hopefully, reduce the turn around time for our tanker (especially since we have NO hydrants)
I hope everyone will take a stab at this one (Dal90 you always have great answers), and for those number junkies out there, the more evidence the better (gonna show them to a white hat).