Hi All

I have been thinking about fitting a VSD to liquid pumps on flooded systems where the number of system users, (tunnels, spirals, glycol chillers etc) change over the course of the production day. On most plants there are at least two pumps with two being needed for full load but one ends up being "oversized" during the non production times. If one of the pumps was speed controlled to maintain say 2.5 bar over LP instead of it going up to 4 or 5 bar over LP when only the holding freezers are running power savings would be made which would over time recover the cost of the upgrade.

Has anyone done something similar or are there any traps in this?