Emerson Exchange 365

Pressure Reduction

Hi

If I want to reduce Gas pressure from 200 Bar to 10 Bar with flow rate 70MMSCF,

would you please give advice me with your suggestion and consideration?

Thanks

MOH

• 19 Sep 2016 11:27 AM
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6 Replies

• kkjens

  

  • 19 Sep 2016 1:33 PM

  It depends. Can you supply more details including operating temperature range and operating flow range, will they both vary?

  Kurtis Jensen  |  Instruments Product Manager | Fisher

  T (+1) 641 754-2511  |  Mobile: (+1) 641 485-1805

  kurtis.jensen@emerson.com

   

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• MOH

  

  • 19 Sep 2016 1:43 PM

  In reply to kkjens:

  Hi Mr. Jensen
  The temperature is 100 to 130 °C and flow rate vary between 0 to 70 million standard cubic feet per day

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• MOH

  

  • 21 Sep 2016 4:04 PM

  In reply to MOH:

  Hi
  is not possible?no advice

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• Reid Youngdahl

  

  • 21 Sep 2016 5:01 PM

  In reply to MOH:

  Hello,
  I will start off with stating that it would be best for you to work with your Local Emerson Business Partner as there are many variables to consider when sizing & selecting a control valve ( Application, piping size & schedule, allowable sound pressure level, etc. ). Below is a link to Emerson's Local Business Partner contact information:
  
  www2.emersonprocess.com/.../contacts.aspx
  
  Per the conditions you have provided, I suggest looking at a Fisher HP control valve.
  
  www2.emersonprocess.com/.../FisherHPEH.aspx
  
  Hope this helps,

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• SanjaySherikar

  

  • 21 Sep 2016 5:25 PM

  In reply to Reid Youngdahl:

  Hello MOH,
  To answer your latest query ... yes, it is very much possible - it is done quite frequently and successfully.
  However, lot of care needs to be exercised in selecting the right valve for such high-DP conditions ... first, and foremost, is that it will require a valve with multi-stage trim (it breaks down the DP, 190 bar-d in this case, in smaller steps). This is critical to to avoid failure due to excessive vibrations and/ or noise. (Believe it or not, this is a common mistake and fixing such mistakes is very costly.)
  In addition, from your side, following needs to be defined (as a minimum) so you end up getting the performance that is expected: (1) Minimum flow rate to be controlled, (2) Allowable noise (typical is 85 dBA at 3 ft from the pipe, 3 ft downstream), (3) Any off-design conditions at which the valve is expected to flow, (4) Actuator requirements (stroke speed, fail positions ... etc).
  I have been dealing with control valves for more than 25 years and can help you with it if there is further interest. (Else you can follow Reid's advice in the comment above.)
  BR

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• MOH

  

  • 22 Sep 2016 10:47 AM

  In reply to SanjaySherikar:

  Hi
  Thanks for your answers, are helpful. for detail of valve . i am wating for process engineer to finialize process design.
  Regards
  Mohsenv

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