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Problem With Writing Offshore Plant Design Basis


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#1 Doneisbetterthenperfect

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Posted 01 December 2023 - 08:26 AM

Hello, I am a college student dreaming of finding a job in the plant engineering field.
 
I found this community while Googling, and I have some questions, so I'm leaving a question.
 
Currently, I am working with my colleagues to create a P&ID for an offshore natural gas plant.
Of course, it's not something you actually get paid to do, but with colleagues who have the same dream, 'Let's work as if we were really getting paid!' That's why we're doing this.
 
Here's how it goes:
Assumption) Discover a magic gas field that produces a constant flow rate at the same pressure and build an offshore plant.
1. Produce deliverables for the FEED stage to build an offshore plant.
2. Produce deliverables for the EPC stage to build an offshore plant.
 
Current progress is at stage 1.
The problems we face now are:
  For line sizing, minimum technical requirements (e.g. maximum pressure drop, max/min fluid velocity, etc.) are needed but cannot be found.
 
Is there perhaps a rule of thumb or standard for minimum technical requirements for offshore natural gas plants?
 
Sorry for my poor English skills.
Also, this is my first post, and if it is a post that ignores the rules of this community, I will edit it.


#2 latexman

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Posted 01 December 2023 - 09:00 AM

Let you Google "practical pipe sizing guidelines".  You'll get a lot of references.  The first one, and supposedly the most relevant one, is Rules of Thumb: Flow Parameters.  The author, Stephen Hall, is a member here.

 

The RoT that caught my eye is this one - "A rule of thumb that incorporates pipe size is to choose liquid lines to handle a velocity of 1.5 +d/10 where ā€œdā€ is the pipe diameter, inches. This gives 1.6 m/s for 1-inch and 2.5 m/s for 10-inch piping, and about 20 kPa/100 m pressure drop. Similarly, gas lines can be sized for 20d m/s and steam lines 35 m/s (maximum)."

 

By the way, I love your username!



#3 Pilesar

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Posted 01 December 2023 - 11:04 AM

I recommend finding the Handbook of Offshore Engineering by Chakrabarti. ISBN is 9780080443812. This goes into developing design basis. Chapter 11 (in the second volume) gives sizing criteria for gas and oil lines. It also provides real examples from selected offshore projects.



#4 Doneisbetterthenperfect

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Posted 01 December 2023 - 10:53 PM

Let you Google "practical pipe sizing guidelines".  You'll get a lot of references.  The first one, and supposedly the most relevant one, is Rules of Thumb: Flow Parameters.  The author, Stephen Hall, is a member here.

 

The RoT that caught my eye is this one - "A rule of thumb that incorporates pipe size is to choose liquid lines to handle a velocity of 1.5 +d/10 where ā€œdā€ is the pipe diameter, inches. This gives 1.6 m/s for 1-inch and 2.5 m/s for 10-inch piping, and about 20 kPa/100 m pressure drop. Similarly, gas lines can be sized for 20d m/s and steam lines 35 m/s (maximum)."

 

By the way, I love your username!

Thank you for your dedication! I guess I'll have to look it up. 

and my user name is 
 my life motto! I'm glad you like it.



#5 Doneisbetterthenperfect

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Posted 01 December 2023 - 10:54 PM

I recommend finding the Handbook of Offshore Engineering by Chakrabarti. ISBN is 9780080443812. This goes into developing design basis. Chapter 11 (in the second volume) gives sizing criteria for gas and oil lines. It also provides real examples from selected offshore projects.

Thank you Pilesar!  I'll look it up too!

This community is very helpful!



#6 shvet1

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Posted 04 December 2023 - 12:19 AM

https://a.co/d/7A6Z2n6



#7 Doneisbetterthenperfect

Doneisbetterthenperfect

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Posted 06 December 2023 - 04:29 AM

 

Thank you! I hope you to have a great day!






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