50,000 vac. units - What's max. hose length?

[Steveo]

Donald or anyone else that may know,
What is the max. 2" hose length I can use while running 4 x 3-stage vac. motors all in parallel (50,000 vacuum units).
I was using 150' of 2'' hose while running 3 x 3-stage vac. motors in parallel, with excellent suction. Now that I've added another parallel 3-stage motor, what is the max. length of 2'' hose I can safely use?
If you need to know, I am running the solution at 400 psi (in-line psi gauge at the trigger).

Thanks for your help,
Steveo

[Donald]

hose length

I know you can operate 200 ft with 2" hose fine. I notice at 250 ft you can feel the suction drop off a bit.

[magiccarpetexpress]

Question for Donald

I'm setting up four lamb motors (117500-12, 3 stage) in 2 pairs of series then parellel with two 2" stacks to a 55 gallon drum. These are the big 7.2" 3 stage motors and each motor independantly offers 145.9" lift and 102.5 CFM. How much 2" smooth bore hose can I effectively run with this set up before needing an inline vacuum booster behind the wand?
My combined lift and cfm numbers for the entire system should be as follows:
145.9x.65=94.835
145.9+94.835=240.735" H2o Lift
(or if you divide by 13.5 it converts to 17.832"Hg lift).
102.5x.1=10.25
102.5-10.25=92.25
92.25x2=184.5 CFM
240.735x184.5=44,415.6 Total vacuum units.
I figure I should be able to go about 200 feet out, but the lift is kinda high for the amount of CFM in the system which i think makes the it somewhat unbalanced. Do you agree, or am I missing something? Am I doing this right so far? Thanks.