Using A Centrifugal Pump

hi,
in our site we use a centrifugal pump (1.5kw)to remove the condensate from the qudrapule effect falling film evaporater surface condensor and to transfer this to a collection tank which is located AT 8MTR. level,from there it is being send to the drain with the help of another pump.
i want to eliminate this drain pump.
If i drain the condensate from condensate transfer pump discharge approcx.1 mtr. whether it will have any effect on vacuum maintained in the evaporater/
thanks
prasad