6 replies to this topic

[iylia]

Hey guys,

As part of my final year project, I have to prepare a P&ID for a distillation column that I have designed.
I was wondering if anyone knew where I could obtain samples of similar P&ID's which I can make reference to while designing mine?
The column is just an ordinary distillation column with a partial reboiler and a total condenser with operating temperatures up to 250C and pressures up to 350kPa.

Thank you for your help.

[sundutt]

standard custamised P&ID you can generate yourself by showing level controller, flow controller, temperature controller.
first list the process varibales & then you develop control loop, it is very easy task.

regards;
santosh_khopade@rediff.com

Hey guys,

As part of my final year project, I have to prepare a P&ID for a distillation column that I have designed.
I was wondering if anyone knew where I could obtain samples of similar P&ID's which I can make reference to while designing mine?
The column is just an ordinary distillation column with a partial reboiler and a total condenser with operating temperatures up to 250C and pressures up to 350kPa.

Thank you for your help.

[Zauberberg]

See attached document (page 32 shows the column P&ID). The file is also available at: http://www.pip.org/p...icelist.asp?p=5

Attached Files

•  Sample-PID.pdf   641.94KB   551 downloads

[saeed.s]

Hi liyla,
It s better to change "partial reboiler" to reboiler. I think partial reboiler is meaning les.
Good luck

[iylia]

Thanks for the help.

I went ahead and did most of my P&ID and its nearly complete now.
Just thinking where should i put High High or Low Low alarms and include shutdown systems.
Not sure what conditions would constitute a shutdown as that would be a major set back for the plant.
One scenario that I found that could cause a shutdown would be a very high liquid level in the column as that would cause flooding of the column.
I guess the temperatures of the product streams (indicating product quality/composition) would also constitute a shutdown if it were to fall far below or above the expected value.
Not sure what else though.
Any ideas?

Thank you.

[Zauberberg]

Shutdowns and safety interlocks are employed in those cases when exceeding certain process parameters would lead either to equipment damage or personnel injuries, or both. High-high liquid level in the column (and subsequent flooding) normally does not belong to such type of deviation, but there might be some exclusions in your case - we don't know what the system looks like, and what are other possible hazards that can be caused by high-high liquid level.

[gvdlans]

Process safety studies such as HAZOP (HAZard and OPerability study) and LOPA (Layer Of Protection Analysis) are often applied to identify the hazardous event scenarios and to verify how much safeguarding is required to control/mitigate the scenarios. After the March 2005 Texas City Refinery accident, many refinery columns have been provided with high level shutdowns and/or alarms, where previously completely overfilling such a column was not considered credible. Flooding of a column often only results in a process upset/off-spec product which would not justify the installation of a high level shutdown.

Edited by gvdlans, 22 October 2010 - 09:36 AM.