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[EnergyPlus_Support] Boiler loop problems

Dear Forum,
I think I figured this out sometime ago, but have forgotten what I did?..
?	I have a PlantLoop with 2 boiler and a Bypass on the Supply side.
?	I am using "CommonPipeSimulation" in my PlantLoop definition in order to incorporate a secondary / demand side pump.
?	E+ does not like supply side variable speed pumps when CommonPipe is used, so I am using a constant speed pump (P1) on the supply side inlet branch.
?	B1 and B2 do not run continuously.  B1 runs most of the time and B2 operates only when B1 cannot carry the load.
?	Since P1 runs continuously at constant speed, the water temperature leaving the Supply Outlet is diluted ? it's a blend of the B1 outlet temperature and the remainder of the flow, which goes through the bypass.
?	I don't want diluted outlet temperature!  (It's degrading coil performance on the demand side)

Suggestions, please! 
p.s., If I get that part solved, the next step is to figure out how to make P1's power vary with flow.




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