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Hi all,
The pressure drop across the tube side ( cooling water ) of the surface condenser to steam turbine is high( almost double the design value) . This high pressure drop is being observed even when the exchanger is clean. This is a shell and tube exchanger with tube side two passes. what can be the possible causes?
Thanks
ss mahanti
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Pressure Drop Across Surface Condenser
Started by Guest_S S Mahanti_*, Jan 31 2006 12:37 AM
3 replies to this topic
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#2
Samir Gupta
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Posted 01 February 2006 - 06:05 AM
Are you also getting the temperature profile as per your design values?
How do you know that the flow across the exchanger is as per your design value? It may be possible that the flow through the tube side is much more than that in your design basis and hence because of the higher velocity in the tube side, the observed pressure drop is more.
Samir
How do you know that the flow across the exchanger is as per your design value? It may be possible that the flow through the tube side is much more than that in your design basis and hence because of the higher velocity in the tube side, the observed pressure drop is more.
Samir
#3
Guest_S S Mahanti_*
Guest_S S Mahanti_*
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Posted 01 February 2006 - 11:54 PM
Dear Samir
Measured cooling water flow is much lesser than the design. Delta T across the exchanger is higher than the design value. This is because of low cooling water flow. This shows that there is some restriction in the exchanger . What can restrict flow in tube side of a shell and tube exchanger? This is what I am looking for.
Thanks
SS Mahanti
Measured cooling water flow is much lesser than the design. Delta T across the exchanger is higher than the design value. This is because of low cooling water flow. This shows that there is some restriction in the exchanger . What can restrict flow in tube side of a shell and tube exchanger? This is what I am looking for.
Thanks
SS Mahanti
#4
Samir Gupta
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- Members
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- 20 posts
Junior Member
Posted 02 February 2006 - 01:54 AM
Dear Mahanty
There is nothing except excessive fouling/scaling or awful tube to tubesheet jointing that can restrict flow thru tubes side of an exchanger (you may visually inspect the tube side to rule this out). I believe that no tube inserts are there. I also presume that adequate flushing had been done on the cooling water side during the pre-commissioning to flush out any foreign material in the pipelines/equipment.
Are you sure that the pressure drop is in the exchanger and not in the upstream pipeline/fittings or due to elevation, etc...
Regards
Samir
There is nothing except excessive fouling/scaling or awful tube to tubesheet jointing that can restrict flow thru tubes side of an exchanger (you may visually inspect the tube side to rule this out). I believe that no tube inserts are there. I also presume that adequate flushing had been done on the cooling water side during the pre-commissioning to flush out any foreign material in the pipelines/equipment.
Are you sure that the pressure drop is in the exchanger and not in the upstream pipeline/fittings or due to elevation, etc...
Regards
Samir
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