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Capacity Debottlenecking- Two Phase Flow Regime

two phaase flow velocities

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#1 Phukan

Phukan

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Posted 16 March 2017 - 07:15 AM

We have a Naphtha hydrotreater which is running at 140% of its installed capacity thanks to some modifications done in heater convection section which resulted the increase of heater absorbed duty. Although wqe have not faced any hydrauilic limitation in the circuit, at this point we are a little worried about the impact it might be having on the pipng mainly the bends of furnace and also the heat exchaanger tubes. Can anyone tell me the maximum recommended tube and shell side velocities of heat exchangers in two phase flow. 

 

Thanks,

Dipankar



#2 Zauberberg

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Posted 18 March 2017 - 02:11 AM

For heat exchanger vibration analysis, you could try with some advanced analysis in HTRI or similar software. Also refer to various published guidelines for maximum nozzle momentum in multiphase flow service.

 

As for the piping, detailed stress analysis will answer your question. Not all systems will behave the same even with the same pipe layout and fluid velocities, if the supports are arranged differently. Get a copy of DNV RP-O501 Erosive wear in piping systems (it is free online).

 

See some of the references below:

http://www.chemwork....ocity Limit.pdf

https://www.cheresou...on-due-to-flow/

http://www.hse.gov.u...rrpdf/rr115.pdf



#3 gegio1960

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Posted 20 March 2017 - 12:08 AM

Any concern about safety? I would check impacts on PSVs and relevant piping...

good luck



#4 Phukan

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Posted 20 March 2017 - 08:27 AM

Thanks Zauberberg for your inputs  . I have done preliminary vibration analysis and it is howing some issues. Yes gegio1960 the PSV aspect  has to be seen.

Thanks again for your replies. 






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