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high velocity

high velocity

high velocity

(OP)
Hi dear members,
i'm asking if there is a material (metallic, non metallic or hybrid) which can survive to a sea water velocity of 120 m/s ?
thanks for your comments

RE: high velocity

Sure there are, many high strength, corrosion resistant Ni alloys would do OK, and Co alloys even better.
Look at Ultimet from Haynes.

You could try a 6%Mo superaustenitic stainless, but I have only seen data to about 150 ft/sec.

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Plymouth Tube

RE: high velocity

(OP)
thank you for the response, but as you said, the maximum velocity that i found is around 40-45 m/s (131-147 ft/s).

RE: high velocity

At this flow I presume that there will be cavitation. Look at Co alloys.
I have used them as chokes in high flow situations, but I doubt that I ever went much over 200 ft/sec.
Is this a choke? If so then look at Silicon carbide ceramics.

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Plymouth Tube

RE: high velocity

(OP)
In fact, my question is regarding a pumped storage hydroelectricity project where the velocity reach such values. so we are starting to think what could be the materials candidates for pipes with diameters about 7 meters. may be we should think about high strenght metals with ceramic coating ?
thanks

RE: high velocity

There have to be some units wrong here.
If you had any length of this pipe you would get very little flow.
At this velocity 300m of pipe would have a 30bar pressure drop, that is 1,000 ft of head loss.

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Plymouth Tube

RE: high velocity

(OP)
excuse me, 7 m is the tunnel diameter. the pipe diameter will be about 4-5 m according to the project manager. they want to produce 250 MW as energy which corresopnd to high pumping capacity.

RE: high velocity

The numbers don't jive.
This is too small of a passage.
Your flow is in the 5GW range, way off.

Double check the math.

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Plymouth Tube

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