How Do I Calculate Design Pressure from Operating Pressure?

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    Design Pressure
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Discussion Overview

The discussion revolves around calculating design pressure from an operating pressure, specifically in the context of designing a LPG metering skid. Participants seek clarification on the necessary details and standards relevant to the design process.

Discussion Character

  • Technical explanation
  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant inquires about the method to calculate design pressure given an operating pressure of 23.84.
  • Another participant emphasizes the need for more specific information regarding the system type and the units of pressure (psi, bar) to provide accurate guidance.
  • A participant specifies that they are designing a LPG metering skid with an operating pressure of 23.84 bar and a flow rate of 97.44 to 103.9 m3/hr.
  • Further clarification is requested regarding the specific components being designed, such as pipes or vessels.
  • Participants mention the material of construction as carbon steel but do not elaborate on its implications for design pressure calculations.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the calculation method or the specific requirements for the design pressure, indicating that multiple views and uncertainties remain in the discussion.

Contextual Notes

Participants have not provided details on the applicable codes or standards for the design, which may affect the calculation of design pressure. There is also a lack of clarity on the definitions and assumptions regarding the system components and fluid properties.

alirafsan
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hello

how i calculate design pressure if i have operating pressure?
eg: i have opearting pressure 23.84, how i calculate design pressure.
please help me.
 
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Hi there, you have to be more specific, what kind of a system you are designing? what is the operating pressure you have mentioned is intended for (equipment, fixture...etc). I cannot help you unless you provide more details about the system you are talking about, and the pressure you mentioned (23.84) is it psi, bar !

In general the design pressure for any system depends on the type of system (water, steam, compressed air, fuel ...etc) once you have determined the working fluid you can follow related standards for the design starting with the hydraulically most demanding point, then by using your selected pressure drop (based on the type of fliud) you can perfrom your sizing. The design pressure given in standards such as ( ASHRAE, British standrads..etc) will give you the optimum design pressure or velocity of fluid that will spare your system from noise, corrosion or excessive energy costs associated with high pressure drops.

You have to provide more details!
 
hi,

sorry for that, actually i want to design a LPG metering skid whose operating pressure is given as 23.84bar and and flow rate is 97.44 to 103.9 m3/hr.
 
Still not clear enough, what component or components you are designing ( pipes, vessels, compressors...)?
 
its a 6" pipe sch 40.
 
alirafsan said:
hello

how i calculate design pressure if i have operating pressure?
eg: i have opearting pressure 23.84, how i calculate design pressure.
please help me.

What code is the system built to?

CS
 
yes its carbon steel
 
alirafsan said:
yes its carbon steel

Are you sure?
 
yes, its carbon steel. how can i design the flow metering skid?
 

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