Condensate Returing from the process is stored in a Vertical Tank kept below Groung Level.

Can we use Air Compressor to push the condensate in to boiler. Since use of pump may form Cavitation.

Please also advise whether use of de-aerator is must.

What do you mean, use an air compressor to push the condensate into the boiler?  Are you talking about a pumpless condensate system like Spirac Sarco offers (along with several other companies)?  Technically, you can convert the tank to do this, if it is rated for the correct pressure and the inlet/outlet piping are in the correct physical location.

As far as a deareator, always run BFW through a deareator.  It's just cheap insurance for your boiler.

Most industrial deaerator/feedpump arrangements don't require anything like 7 - 10 meters of NPSH.

The typical arrangement is for there to be transfer pumps to move condensate from the tank to the deaerator. Any make-up water required is also added at the DA. (Adding make-up water full of dissolved oxygen to a carbon steel condensate tank filled with hot condensate is inviting serious corrosion problems.) Then there are feedpumps taking their suction from the DA, moving water to the boilers.

It's important to select the DA and feedpumps to match the operating conditions in your plant. Everything needs to be piped correctly as well. This is not difficult to accomplish, however there are many plants suffering on-going problems simply because they failed to properly select and install the correct equipment. And the maddening part is, that to do this correctly very often wouldn't have cost much if any more than the mess they're living with.

Condensate that is discharged by the steam traps fitted at the process equipment should be allowed to flow by gravity to a local condensate receiver. The collected condensate should then be pumped to the condensate return line to the feedtank for re-use as boiler feedwater. Since I am well versed on the spirax-sarco pressure powered condensate pump, I highly recommend this to you. They have a compact packaged unit which incorporates the receiver and other ancillaries and all you have to do is fit it in the appropriate manner. I have installed so many here and the end-users are very satisfied with its performance.You can refer to a local spirax guy in your area and he will be able to come up with the correct installation.

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