2 replies to this topic

[kloroform]

dear all,

 

i am a new junior engineer. I really want to understand about depressurization, i have read API RP 521 1997 edition and the FEED document of the depressurization of some facilities here, but to be honest, i still dont understand. 

 

could you please give/recommend me an article, books or other references. so i can understand about the fundamental concept of depressurization more easily ? since form the FEED document, it is calculated by Hysys dynamic depressurization, i can't understand the basic concept of the calculation.

 

I want to understand the philosophy of why comparing fire, adiabatic, and isochoric case so eventually i can calculate the maximum blow down flow rate and minimum metal mass temperature . and how to determine the isolatable section so i can determine the number of SDV and BDV.

 

i hope you can understand my confusion o understand depressurization concept. thanks in advance

[Bobby Strain]

Depressurization is a noun in the English language. What is of interest to you is depressure, a verb. The former is a state. The latter is an action, which is what you are looking for. The term you used has been misused repeatedly, so most think and refer to the action as you have done. So, maybe a clean, clear definition will start your quest on the right path.

    And the action is quite simple. One opens a valve of some type so that material can flow from a contained space. This material flow, since it is emptying the container will result in lowering the pressure of the container contents. With liquid contents in the container, as the pressure is reduced, some of the liquid will vaporize. Thus, much of the original gas content as well as vaporized liquid must be removed to achieve some equilibrium state at a lower pressure. The guidelines/requirements are quite explicit in the materials you mentioned. The process is simply a heat and mass balance for the container contents. It's simple, but don't confuse that with easy. Hopefully your employer will give you some guidance as to their practices. If you don't get satisfactory responses, use Google. The answer to most all questions are there. Unless you are looking for a particular snippet of JavaScript.

 

Good luck.

 

Bobby

[breizh]

kloroform ,

You may find additional information reading the papers attached .

Breizh