Why and how are condenser tubes made of different inner dia (or thickness)).docx

7/27/2019 Why and how are condenser tubes made of different inner dia (or thickness)).docx

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Why and how are condenser tubes made of different inner dia (or thickness) ?

Dear All,

I once visited to take the report of ongoing condenser cleaning activity during overhauling,where the person told me about the different tubes (of different internal diameters) which were

cleaned and yet to be cleaned.

It then struck me a question as to why these condenser tubes are made of varying thickness. I

noted that the CW inlet tubes to condenser (which are at bottom) are thicker than the CW outlet

tubes (which are at top). Correct me if I am wrong.

7 days ago

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7 comments

Muhammad Aijaz UmerUnfollow Follow Muhammad Aijaz Umer

Muhammad Aijaz Umer Umer To maintain same velocity of around 2.2 m/sec to avoiddeposition of biological growth. As per equation of continuity velocity of fluid is inversely

proportional to the area of tubes for constant flow of fluid

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BradUnfollow Follow Brad

Brad Buecker When I began my career at my first power plant in 1981, I worked at a facility

with a number of steam generating units, in which different condensers contained tubes of

admiralty metal, 90-10 copper-nickel alloy, and stainless steel. All tube diameters were 0.75inches. The admiralty metal tubes were the thickest because the material had the highest heat

transfer coefficient of all three, but also was softest. Thus, the greater thickness was chosen to

provide an erosion allowance but still with good heat transfer. As I recall, the wall thickness for

the admiralty tubes was 0.049 inches. The wall thickness for the 90-10 copper alloy was 0.035inches, and for the stainless steel, 0.028 inches, if I remember correctly. The heat transfer

coefficient for 316 SS is less than half of that for admiralty. Copper alloy tubes are often not

recommended any longer for steam generators, and especially not for feedwater heater tubes, inhigh-pressure units, as at pressures above 2000 psi or so, copper will carry over with steam and

deposit on turbine blades. Also, copper deposition in the boilers themselves increases the

complexity of chemical cleanings.



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AnkurUnfollow Follow Ankur

Ankur Verma Dear Brad Buecker,

What you are talking may be true about metal thickness of tubes. But I'm asking about inner diaof tubes.

Kindly explain if otherwise.

Many Thanks,


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NawinUnfollow Follow Nawin

Nawin Lal Dear Brad hats off to yr memory . I really go thru yr comments on various topics of

power plant .yr analysis is great



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BillUnfollow Follow Bill

Bill Torrance Ankur- same thing! A TUBE is defined by its outer diameter, and differentthicknesses lead to different inner diameters/bores. Different thicknesses are often used for (eg)

areas around the periphery of the tubenest upper side to allow for erosive wear from the steam

flow.



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RahulUnfollow Follow Rahul
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4/4

Rahul Raghavan @ankur: i guess the inlet tubes are made thicker because they have to handle

water at higher pressure (from CW Pump discharge) when compared to outlet end as pressure

drop takes place in the condenser tubes.



0

ManmohanUnfollow Follow Manmohan

Manmohan Sobti Usually, higher thickness tubes are used in the upper section which issubjected to steam impingement. Higher thickness provides greater erosion margin thus

increasing tube life. Design criteria specify higher tube thickness in steam impingement zone

along with baffles to prevent direct impingement

3 days ago
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Why and how are condenser tubes made of different inner dia (or thickness)).docx