Erosion velocity rate in Stainlees Steel 304

• May 28, 2013

• #2

EdStainless

Materials

May 20, 2004

16,261

Erosion by what media?
Clean water? then it is zero until you get to sonic velocities.

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• May 29, 2013

• Thread starter
• #3

Ezequiel1982

New member

Jun 20, 2010

37

Hi,

By D2O (heavy water). I want to calculate the erosion on a stainless steel nozzle after 35 years of operation. The velocity of the fluid is 10 m/s.

I need to know which formula or theory should apply for this kind of steel (AISI 304)

Can you help me?

Best regards!

 

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• May 29, 2013

• #4

EdStainless

Materials

May 20, 2004

16,261

an orifice or a smooth nozzle? If it is an orifice you will probably have some cavitation damage. If it is a nozzle then these are fairly low flow velocities and I don't see why there would be any erosion.
Talk with your flow nozzle supplier. I have heard them say that they have tested many old nozzles and find them to still be in specification.

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• May 29, 2013

• Thread starter
• #5

Ezequiel1982

New member

Jun 20, 2010

37

Hi,

Yes, it is a Nozzle (not an orifice) attached to a pipeline. The client requested to us to consider the posibility of erosion. I´m quite sure that no erosion could happen there. However, I have to present something (docs, calcs, code, etc) to support my theory of no erosion.

I´m thinking that If I can calculate the erosion velocity rate for AISI 304 will be good enough.

I have the expresion to calculate the erosion rate according Bitter. But the unit of it is mg/g and in not time dependence.

Any idea?

 

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• May 29, 2013

• #6

SJones

Petroleum

Apr 22, 2001

3,929

API RP 14E, Equation 2.14 might help you out as a starting point.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

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• May 30, 2013

• #7

moltenmetal

Chemical

Jun 5, 2003

5,504

In clean services free of solids, very high velocities do not result in erosion even over comparatively long design service lifetimes. Take for instance the plugs and seats of control valves. Velocities in these can be 10x the velocity in piping constantly, i.e. on the order of 100 ft/s, and significant erosion in clean services is not observed.

If there is particulate matter present, that makes all the difference. Erosion-corrosion, i.e. erosion of the passive film leading to corrosive attack, is another matter entirely.

 

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• May 30, 2013

• #8

EdStainless

Materials

May 20, 2004

16,261

I believe that there was a paper at this years EPRI Heat Rate conf where a nozzle producer talked about testing flow nozzles that were decades old and they still met original calibrations.
I'll look for it.

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• May 31, 2013

• Thread starter
• #9

Ezequiel1982

New member

Jun 20, 2010

37

EdStainless, thanks a lot!

 

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• Jun 3, 2013

• Thread starter
• #10

Ezequiel1982

New member

Jun 20, 2010

37

Hi EdStainless,

Could you find the paper ?

Best regards!

 

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• Jun 3, 2013

• #11

EdStainless

Materials

May 20, 2004

16,261

regrettably those comments are not in the printed paper.
Sorry

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• Jun 3, 2013

• #12

StoneCold

Chemical

Mar 11, 2003

992

If the nozzle is a solid piece. Like a Venturi meter then you can do ultrasonic testing to see the thinning, if there is any.
You might be able to x-ray the nozzle to confirm you don't have problems either.
Just a thought.

Regards

StoneCold

 

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