Vacuum Condenser Cooling Water Velocity

The velocity of the seawater is dictated by the piping and the pumping capacity and many other factors.

You need to know how much heat you need to remove from the condenser and how much cooling capacity you have available.

In other words no, we have no idea.

A picture:

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5. Sea Water Cooling Systems - VWS Westgarth

hello? offcourse i know how to calculate those flow ratea you mean. Basic calculation is given already. I would like to exagerate my question since I did not expect you understood it that way.

What I mean is that, we have a straight-through, single pass vacuum condenser. And I would like to know what is the minimum required velocity of my cooling seawater for my vacuum condenser in such away that seaweeds, debris, organism, and etc. will not be stuck inside the cooling tubes. In other words, during normal operation, it will not allow foreign objects to be stuck inside the cooling tubes, and my condenser will be safe from fouling due to unwanted matter.

Thank you.

I'd suggest adequate filtration so that, "seaweeds, debris, organism, and etc. will not be stuck inside the cooling tubes."

Then velocity becomes less an issue.

It is obvious that I am incapable of helping you.

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Seaweed, debris organisms should be gotten rid of at the inlet unless you want to push them through the system. Maybe search for seawater filter systems.

From my previous comment I would suggest to keep it in between "not too fast" (Erosion, process dependent) and not to slow (sea animals are such foul creatures they might enjoy a little stream of freh seawater and food coming past. :-)

How slow is too slow - I can not answer. What did you find in you research? Any numbers you would suggest yet?

try this.

Fouling is a function of settleable solids levels, dissolved solids levels, and their nature. It is better to remove foulants from the utility stream first:

• once a barnacle has attached itself to a heat exchange surface, mechanical removal or possible high-pressure water jetting are practically the only methods of removal
• No velocity will remove a piece of driftwood that is larger than the outlet port of the equipment through which it has inadvertently passed
• Many seawater cooling systems are dosed with chlorine-releasing substances that render any biology carried dead before using the stream

There is no requirements for velocity of seawater other than "Not too fast".

There are other requirements that will entirly depend on a lot of input which has not been given in your request.

As per advice above you can search for seawater cooling systems in the net with plenty of information avaiable.

One may always ask the condenser manufacturer. One would expect a telephone dialogue to be in place with the manufacturer's Applications Engineer.

You guys are all too good! And you find these ones and respond before I can, so all I can say is "me too". Cronin gave you the best answer - go for the best material with highest tolerable velocity that will not result in erosion. Also introduce strainers to collect all the "trash" before it gets to the tube sheet. You should ensure that you are pumping water and not sand.

Just a little follow-on information......

Many new condensers in salt water service are using a tube material called "SEA-CURE" offered by Plymouth tube. The tube material was developed specifically for steam surface condensers in salt water service.

According to Plymouth, it can also tolerate a higher tube-side velocity, thereby decreasing your capital cost by permitting a smaller condenser. By "higher" I mean higher than the values suggested by the HEI guideline.

SEA-CURE may not be the best choice.....A lot depends on the salinity of your installation.... which you refuse to disclose.