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Dear List Members, We had twelve number of pumps connected in parallel. Each pump motor has capacity from 110 to 200 horsepower. These pumps are used to control the supply to whole city. We have to mantain pressure of 3.2Bar in the line all the time. The problem is that in given instance of time if five or six pumps are running the line pressure is about 2.8Bar. On invoking another pump, pressure increases upto 3.8Bar which is not required. Can any one suggest solution so that pressure could be maintained exactly at 3.2Bar?? Thanks and best regards, A&D IMRAN SHABBIR Automation Engineer Automation & Drive P.O.Box 325 Dubai, U.A.E