6 replies to this topic

[Jake Bennett]

I have been asked to prepare a process flow diagram as part of an interview. I have the actual process flow diagram completed and ensured that it conforms to the relevant standards. Right now the PFD looks rather simple and basic however it has the correct information in, I was wondering what other information could I include to make it look professional and impressive / memorable. A year or so ago I had the opportunity to look at PFD's produced by a company from my memory of these I though that some of the information that I could include could be the company's logo, revision number, title, project name, page number and author. Do you think it would be good to include some/all of these and are there any other things that you think I should include. Is there any good examples of professional PFD's that you could point me towards, if there are any in the public domain as I think this site doesn't allow private documents to be transferred.

 

As a side note what numbering system do you normally use for your pipelines I used to number though the process however a single modification could mean renumbering the whole document, I was thinking of using the major units as the starting points and numbering around each one of them.

 

Thank you for you help, Jake Bennett.

[Bobby Strain]

Well, if I were you, I would move on to the next interview.

 

Bobby

[Jake Bennett]

Well, if I were you, I would move on to the next interview.

 

Bobby

 

Why would you recommend this?

[Subject_Name_Here]

It does seem odd they would ask you that for an interview... Does the job function primarily involve PFDs? If not, that might be the last question I would have for a candidate.... From my experience, there is no widely used standard for PFDs besides general object shapes. As long as you include enough information to visualize a process (phase, temp, flow, pressure...) I think you'll be good. If they require additional information then they may be confusing PFDs with P&IDs.

 

Mike

[Padmakar Katre]

I have been asked to prepare a process flow diagram as part of an interview. I have the actual process flow diagram completed and ensured that it conforms to the relevant standards. Right now the PFD looks rather simple and basic however it has the correct information in, I was wondering what other information could I include to make it look professional and impressive / memorable. A year or so ago I had the opportunity to look at PFD's produced by a company from my memory of these I though that some of the information that I could include could be the company's logo, revision number, title, project name, page number and author. Do you think it would be good to include some/all of these and are there any other things that you think I should include. Is there any good examples of professional PFD's that you could point me towards, if there are any in the public domain as I think this site doesn't allow private documents to be transferred.

 

As a side note what numbering system do you normally use for your pipelines I used to number though the process however a single modification could mean renumbering the whole document, I was thinking of using the major units as the starting points and numbering around each one of them.

 

Thank you for you help, Jake Bennett.

Hi,

Can you please upload the PFD you have prepared and let members comment/give suggestions if it lacks something.

[Art Montemayor]

A PFD is the starting point in designing a process system.  However, by itself it doesn't lead directly to a P&ID - which is the next required major step in a design process.   For that to happen, the PFD has to be linked to a Heat & Mass Balance of the process.   The Heat & Mass Balance Table is either drawn directly on the PFD (in simple processes), or it can be generated in a separate drawing.

 

You need the heat and mass to continue on with the subsequent design stages in the process - stuff like all the pipe sizing, pump sizing, etc., etc..   Without it, you can't design any process equipment.  You haven't mentioned it, so I assume you haven't included it.

[oscarsender]

Your PFD should have:

 

- Main controls including the control valves (main instrumentations)

- Operating conditions around equipment ( pressure change at pump inlet and outlet, temperature change at heat exchangers, etc.)

- A table of stream data for main process lines. It can also be shown in a separate sheet as mentioned by Art.

- Main equipment with tag number, name and capacity

- Main process lines, secondary process lines which are important, main utility lines. Include a stream number for proper identification

- Other data which client may want to show.

Edited by oscarsender, 18 August 2014 - 12:23 PM.