Evaluating Impact of Increasing Unit Throughput: Is It Just a Linear Scale-up of Required Relief Rates?

  • Type:
    Conference Presentation
  • Checkout

    Checkout

    Do you already own this?

    Pricing


    Individuals

    AIChE Member Credits 0.5
    AIChE Members $19.00
    Employees of CCPS Member Companies Free
    AIChE Graduate Student Members Free
    AIChE Undergraduate Student Members Free
    Non-Members $29.00
  • Conference Type:
    AIChE Spring Meeting and Global Congress on Process Safety
  • Presentation Date:
    April 12, 2022
  • Duration:
    30 minutes
  • Skill Level:
    Intermediate
  • PDHs:
    0.50

Share This Post:

Rate-dependent scenarios refer to overpressure scenarios for which the applicability and/or the relief requirement for such scenarios are dependent on the design throughput of a process system or unit. Except for the external fire scenario, typical overpressure scenarios for individual equipment might have the potential to be rate dependent.

It is difficult to generalize whether a non-fire scenario would be rate-dependent or not without reviewing the underlying analysis. For example, if the relief rate for a blocked outlet scenario were based on the normal flow rate through an equipment, then this scenario could be rate dependent. However, if such relief rate were based on the maximum capacity of an upstream pump, the same scenario might no longer be rate dependent. Moreover, if credit were then taken for normal outflow through another open path to reduce such relief rate, the same scenario might still be rate-dependent.

The controlling scenario for sizing the pressure relief system for an individual system might be rate-dependent. This might also be true for a common disposal system such as flare. The adequacy of such systems against any proposed increase in unit or facility throughput should be evaluated carefully.

The main objectives of this paper are to provide process engineers general guidance on:

  • how to identify rate-dependent scenarios using some examples,
  • how to evaluate and document such scenarios, as well as
  • how to evaluate potential impacts on such scenarios due to a change (such as increase) in the throughput for a unit or facility.
Presenter(s): 
Once the content has been viewed and you have attested to it, you will be able to download and print a certificate for PDH credits. If you have already viewed this content, please click here to login.

Checkout

Checkout

Do you already own this?

Pricing


Individuals

AIChE Member Credits 0.5
AIChE Members $19.00
Employees of CCPS Member Companies Free
AIChE Graduate Student Members Free
AIChE Undergraduate Student Members Free
Non-Members $29.00
Language: