I just started at a new building and they handed me keys and my areas of responsibility. Of course my first stop in the main plant to see what I have. I have 2 marley cooling towers, with 2 aurora 60hp 1250 gpm condensed water pumps that basically transfer water to 2 Sonex heat exchangers. I looked at the triple duty valves and noticed that they are damn near closed (at 9 on a a scale of 1-10 and 10 being closed). So I checked the suction and discharge gauges and I am reading 0 at suction and 60 at the discharge. These are 8 inch iron pipe with Victaulic couplers. I was astonished at the suction pressure. I would like to see something in the positive pressure range and I believe these to be in vacuum. The cooling tower sump level is only about 50 feet away and about 2' above the suction of the pumps and the pump is rated for 100 feet of head.
I believe that these pumps should be on a lead/lag style operation and there is a Seimens Apogee system (haven't had access to the front end yet due to politics) and the original sequence of operations doesn't state the run status of the pumps for normal ops.
I also found out that the triple duty valves have either been replaced or rebuilt 3 times (once on one pump and twice on the other) in the past 5 years (building commission).
So any thoughts? I think I need to shut down one of the pumps and have it balanced again... or they have over sized the pumps for this application.
Thanks in advance.