Does anyone have the knowledge to make a good comparison of these two pumping Technologies?

I am considering using a Waukesha Universal pump or a Discflo pump for the following application:

I know this group likes specifics so here goes:
flow rates around 100 gpm, head around 200 ft. Temperature varies from 60 F to 200 F.
Viscosities around 200 to 5000 cP, but also around 0.5 cP during solvent rinses.  Occassional pumping of water.  The 5000 cP fluid is shear thinning (power-law fluid index around 0.8)  

I'm super concerned about fugitive emissions, so the seals need to behave well.  I like double mechanical seals with pressurized barrier fluids.  
I need Stainless steel construction for pH and color.

I have a fair amount of experience with discflo pumps, but none with the Waukesha Universal pump.  Do these pumps run dry well like the discflo pumps?  Do they have low vibrations like the discflo pumps?  How about NPSHR?  Tolerance for trash and various operational abuse? If I drop a valve seat in the suction will the pump take the abuse? Any ideas about relative efficiency? Difficulty of maintenance?

Are there any other questions I should be asking?

Any information the community can provide on this I would appreciate.

2011-06-08

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