4 replies to this topic

[montazer]

Dear all

I want to design flare for an 128 km pipeline as a relief system in emergency depressurizing.I can not find any thing even  in API 521.can anybody help me in this matter and introduce me a special reference for that,

 

Thank you all

Edited by montazer, 30 September 2013 - 06:23 AM.

[flarenuf]

Hello Junior member

1. API 521chapter 7 is devoted to design of flare systems

2. have you performed a depressuring analysis on your pipeline ? do you know the required DP flowrate you need to handle ?
   

3. do you have a plot plan of your facilities and an idea of sterile are requirements so you can size the stack for radiation limits?

4. are you intending depressuring the PL in a single flare at one end or one at each end?

What i am trying to get over to you is that flare design is not that simple and you must get certain information together before you can start
I am sure that your company has not just said to you " go and size a flare system" knowing that you have absolutely no experience in doing this ?

We do try to help people here with specific problems or advice, unfortunately answering a generic question like yours cannot be accomplished in a few lines .

Go and get more information , read API 521 , google for other bits of information and then if you have specific questions come back on the board

brian
 

 

[montazer]

Dear Veteran memeber 

 

Thank you. I know how a flare is designed. I mean I worked with flaresim for sizing a flarestack. now it is a sifferent case. there is a long 130 km export gas pipeline. I want to design flare for this pipeline in case of line depressurizng.this pipeline has 16 line break valve. I should find guidlines for determining sufficient No, of flare for this pipeline. all the process data of this pipeline is known.

Edited by montazer, 30 September 2013 - 07:32 AM.

[flarenuf]

hi

sorry i am not understanding your problem here

you say you have all the data for the dP of the pipeline

so that , i assume is flowrate vs time, composition etc etc

you say

 

I know how a flare is designed ---  I should find guidlines for determining sufficient No, of flare for this pipeline

what  do you mean by this?

are you saying you cannot have just 1 flarestack to handle the dP based on sterile area radiation calcs?

there are no guidlines , as far as i am aware for the no of stacks ,

 

please advise more detail

flarenuf

[fallah]

I want to design flare for an 128 km pipeline as a relief system in emergency depressurizing.I can not find any thing even  in API 521.can anybody help me in this matter and introduce me a special reference for that,

 

 

montazer,

 

Is the pipeline can be exposed to an external fire that conducts you to go toward using emergency depressurizing?

 

Anyway, even if so the long pipeline cannot be depressurized per API 521. Such a pipeline is normally to be depressurized for maintenance case and if you have to depressurize it in an emergency case, the best practice is pressure reduction in the pipeline as much as possible without flaring to save export gas and then to start using flare for remain content. Please clarify...