Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

3

Pressure Control Of A Separator

pressure control separator pressure control valve opening control

8 replies to this topic
Share this topic:
| More

#1 james.corrobro@gmail.com

james.corrobro@gmail.com

    Veteran Member

  • Members
  • 45 posts

Posted 07 May 2021 - 07:33 PM

There is a separator with two control valves to maintain pressure of the equipment (separator).
 

The purpose is to maintain 250 psig at separator. For the pressure control valve-1, at what pressure should it start to open ? will it be at 250 psig or higher. What sizing cases should be made for PV-1? Should it be 250 psig at inlet? What will be controller output % at 250 psig pressure?
 

Also for pressure control valve-2 what pressure should it start to open? What sizing cases should be made for PV-2?

 

Attached File  pressure control.jpg   56.19KB   8 downloads



#2 breizh

breizh

    Gold Member

  • Admin
  • 5,640 posts

Posted 07 May 2021 - 10:47 PM

Hi ,

Common sense should prevail!

The controller will do the job , set point  is yours .

Good luck .

Breizh



#3 fallah

fallah

    Gold Member

  • ChE Plus Subscriber
  • 4,849 posts

Posted 08 May 2021 - 12:34 AM

There is a separator with two control valves to maintain pressure of the equipment (separator).
 

The purpose is to maintain 250 psig at separator. For the pressure control valve-1, at what pressure should it start to open ?250 psig will it be at 250 psig or higher. What sizing cases should be made for PV-1? Should it be 250 psig at inlet? Yes What will be controller output % at 250 psig pressure? Normally 50%
 

Also for pressure control valve-2 what pressure should it start to open?250 psig and the controller output goes beyond 50% What sizing cases should be made for PV-2?same flow rate as the valve-1 and pressure drop according to the flare pressure

 

attachicon.gif pressure control.jpg



#4 james.corrobro@gmail.com

james.corrobro@gmail.com

    Veteran Member

  • Members
  • 45 posts

Posted 08 May 2021 - 01:37 AM

fallah- thanks,
what is meant by controller output %
like what is meant by 50% of controller output?
when controller output goes beyond 50%...does it mean pressure is rising much high than 250 psi

 

There is a separator with two control valves to maintain pressure of the equipment (separator).
 

The purpose is to maintain 250 psig at separator. For the pressure control valve-1, at what pressure should it start to open ?250 psig will it be at 250 psig or higher. What sizing cases should be made for PV-1? Should it be 250 psig at inlet? Yes What will be controller output % at 250 psig pressure? Normally 50%
 

Also for pressure control valve-2 what pressure should it start to open?250 psig and the controller output goes beyond 50% What sizing cases should be made for PV-2?same flow rate as the valve-1 and pressure drop according to the flare pressure

 

attachicon.gif pressure control.jpg

 



#5 fallah

fallah

    Gold Member

  • ChE Plus Subscriber
  • 4,849 posts

Posted 08 May 2021 - 01:43 AM

 

what is meant by controller output % In split range control system the controller output splits into 0-50% and 50-100% to manipulate relevant actuator.
like what is meant by 50% of controller output?
when controller output goes beyond 50%...does it mean pressure is rising much high than 250 psi it means the pressure will tend to rise higher than 250 psig

 

 

 

 



#6 sybase666

sybase666

    Brand New Member

  • Members
  • 9 posts

Posted 06 June 2022 - 04:21 AM

your both valves are for outlet, then normally split control will be ok, like 0~50%(OP), open valve1, 50~100%, open valve2, how to size your valve, also depends on your downstream pressure, confirm it.



#7 Art Montemayor

Art Montemayor

    Gold Member

  • Admin
  • 5,775 posts

Posted 06 June 2022 - 08:12 AM

Is this a student problem that belongs in the Student Forum?



#8 james.corrobro@gmail.com

james.corrobro@gmail.com

    Veteran Member

  • Members
  • 45 posts

Posted 15 August 2022 - 11:19 PM

Is this a student problem that belongs in the Student Forum?

Dear Art, 

 

No it is not a student problem. What makes you think it's a student problem?
What difference will it make if I post it here or on student forum. 
I am a young engineer starting out in the industry and trying to learn. 
How do you classify the queries is a student query or an industrial forum query? What are the parameters you're using?
Lot of the more experienced engineers seem to make these kind of comments in the forums instead of helping out young engineers
With all due respect, I think it is also important to share knowledge and mentor young engineers. I am sure someone must have helped you...and I don't expect you had the knowledge you have now, right out of university! 






 



#9 Pilesar

Pilesar

    Gold Member

  • Members
  • 1,046 posts

Posted 16 August 2022 - 12:55 AM

James,

No one who responds to forum questions is paid for their service here. You are welcome to participate. Did you find the answers you were seeking about your initial question? Your recent post after three months does not seem directly related to the initial question. I am glad you want to share your knowledge. I hope you find opportunity to do so in these forums. If you have the answers, post it in this forum so others can learn from your experience. If you do not have the answers after three months, why not? 

  I will offer this advice to a young engineer starting out in the industry and trying to learn:

1) Don't publicly criticize things you do not understand. There is usually a reason behind procedures and rules and just because you do not understand the reasons does not make them stupid or evil. Dig deeper to find out 'why'. Involve a limited number of people in your investigation and expand the investigation if needed. Pronouncing judgement on something you are ignorant about is not good practice.

2) Don't ascribe evil motives to another without sufficient evidence. You cannot know what another person is thinking unless they reveal it. In general, others are not trying to get you to fail, they are not trying to steal your work, they are not hoping you will make mistakes. 

3) If your actions/work/speech/writing is criticized, be grateful. It is extremely difficult to get someone to offer an honest critical opinion. There is great value in an honest appraisal even where there is disagreement on its legitimacy.






Similar Topics