Mr. Lieberman – I have a vacuum tower question. Reducing the ejector steam supply below its design (vendor specified) pressure improves vacuum. How could this happen? I suppose it’s best to operate at the lower seven bar pressure, rather than the design ten bar of steam pressure.
--Sriganesh
Sriganesh – Likely one third of the jets I look at have the property that reducing the motive steam supply pressure below the design value improves vacuum or at least does not harm the vacuum.
The two most common reasons for this are that the ejector steam nozzle is badly worn, or that the downstream condenser is overloaded. Either way, it’s an indication of poor system performance.
--Norm
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