@MJCronin
It is a new plant, close to pre-commissioning stage (luckily there is no possibility of "previous plant owner's maintenance department discarding the important documents". I know the pain).
secondly there is no MBA boss policy here... we move up the ladder with experience.
yes I'd...
@georgeverghese
Please find below the response your questions:
a) Yes there is enough pressure to push the content to downstream tank.
b) the ON/OFF valve is on downstream of the exchangers.
c) there are coolers on downstream of this ON/OFF valve (I have not marked those coolers in the...
@LittleInch
the assumption of "entire system on fire" is limited to the system shown in the schematic. I did not assume the off-spec storage tank which is far way from this unit is on fire.
why?
there are Naphtha surge drums and a reflux drum located above the exchangers shown in the...
Greetings,
I came across this design in one of the refineries handling Naphtha. Kindly refer to the schematic attached herewith.
Naphtha stripper column is provided with an ON/OFF valve on stripper bottom product rundown line. The purpose of this ON/OFF valve is to stop sending the OFF-SPEC...
Greetings...
I came across a piping system wherein minimum distance is not followed on downstream of isolation valve on start-up steam line. Please refer to the schematic attached herewith.
During normal operation, Isolation valve on start-up steam line will be kept closed and it will be...
Greetings,
I came across this design in one of the refineries handling Naphtha. Kindly refer to the schematic attached herewith.
Naphtha stripper column is provided with an ON/OFF valve on stripper bottom product rundown line. The purpose of this ON/OFF valve is to stop sending the OFF-SPEC...
Dear All,
What happens when a centrifugal compressor equipped with anti-surge valve is run on lighter gas than design?
(Design MW of gas= 22, Actual MW of gas=13)?
Does it leads to surge?
Thanks and Best regards,
Raghu N
Hello all,
Good day to you.
I came across a piping system wherein minimum distance is not followed on downstream of isolation valve on start-up steam line. Please go through the schematic for reference.
During normal operation, Isolation valve on start-up steam line will be kept closed and it...
Hi everyone,
Good day to you.
I come across the following scenario.
Service: Refinery fuel gas
As per P&ID, flow orifice (NOT for flow measurement purpose) is specified on downstream of block valve on down stream of anti-surge control valve.
But it is actually installed adjacent to (flange...
I came across a flare header design where check valve is installed on one sub header (size 20 inch).
Is it common to have check valves on flare sub headers? can someone throw more light on this?
Thank you
Raghu N
Dear All,
I have one question.
What determines the flare stack height?
Is this only to burn flare gasses at safe height or any other factors effect the height of the flare stack?
Thanks in advance.
Thanks Emmanuel for those scholarly articles.
However, I tried to explain the concept in simple terms for ease of understanding. https://files.engineering.com/getfile.aspx?folder=2ae2eb9b-48d4-4863-a6ad-906c285b6a0e&file=Barometric_leg-1.pdf
Barometric leg is a vertical pipe connecting two vessels one at low pressure or vacuum condition (P1) and the other at higher pressure or atmospheric pressure (P2).
In general, the low pressure vessel (V1) is located at higher elevation than the high pressure vessel (V2). To enable the liquid...
You need to have following inputs to calculate stack height.
1) Max. Volume of flue gas flow
2) Pressure at the inlet of stack
3) allowable pressure drop across stack as per recommended practices or your site guidelines.
Considering the above inputs, you can calculate stack diameter by...
We used Aspen Plus for Chlor Methanes and Chlor Alkali processes in the past. I feel that's the best simulation tool for its various robust features like well defined property methods, vast database, user friendly Graphical User Interface (GUI) etc.
Thanks for your responses and valuable inputs.
@georgeverghese: as you mentioned, we don't have VFD in current setup and we also faced thermal degradation of lube oil problem in the past. Point taken. We need to study further to provide VFD considering cost factor and other details...
I come across a revamp design of chiller system in which 2 of 3 screw compressors run parallely. Details of the system given below:
Original design: 2 compressors (1-running, 1 standby)
No of compressors in revamp design: 3 (2-running, 1 standby)
Refrigerant: Propane
No of condensers: 4 (Media...
