What causes pressure drops in pressure vessels

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Discussion Overview

The discussion focuses on understanding the causes of pressure drops in pressure vessels, particularly in the context of an electric heater pressure vessel. Participants explore the theoretical aspects, calculation methods, and design specifications related to pressure drops, including their implications for pipe schedules.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks to understand why pressure drop limitation is a design specification and what causes these pressure drops in pressure vessels.
  • Another participant questions whether the inquiry pertains to pressure drops in the medium held by the tank or the vessel's size changes due to pressure variations.
  • A participant clarifies that they are specifically interested in pressure drops of the process fluid within the heater vessel as it is heated from the inlet to the outlet.
  • A link to a resource on the Darcy friction factor is provided as a starting point for understanding pressure drops.

Areas of Agreement / Disagreement

Participants have not reached a consensus, as there are differing interpretations of the initial question regarding the nature of the pressure drops being discussed.

Contextual Notes

The discussion does not clarify certain assumptions about the system's design or the specific conditions under which pressure drops occur, leaving these aspects unresolved.

Who May Find This Useful

Individuals interested in mechanical engineering, fluid dynamics, or pressure vessel design may find this discussion relevant.

jakesee
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I am writing a software that involves calculation of pressure drops in a electric heater pressure vessel as in related to pipes and flanges as described in ASME B16.10, B16.47, B36.10.

I am not a mechanical engineer, but in order to create an intuitive data input sequence (and for my interests), I hope to understand why pressure drop limtation is a design specification, what causes the pressure drops and how to calculate it. And whether this pressure drop is a consideration for determination of pipe schedules.

Can anyone explain the theory or point me to the relevant links that shows in an easy to understand manner about the concepts behind the pressure considerations?

Thanks!
 
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Are you asking about pressure drops in the medium a tank is holding?

Or are you asking about how a vessel changes in size with pressure variations? (Hoop stress)
 
Hi Jupiture6,

I am after the pressure drops in the process fluid a pressure vessel is holding as it gets heated up from the inlet to the outlet while in the heater vessel.

Hope I am clear on that. Thanks!
 

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