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Recent content by nRGee

  1. nRGee

    Condensate formation in start-up steam line.

    @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...
  2. nRGee

    ON/ OFF valve on Stripper bottom rundown line in case of emergency

    @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...
  3. nRGee

    ON/ OFF valve on Stripper bottom rundown line in case of emergency

    @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...
  4. nRGee

    Shutoff valve reset in case of emergency scenarios

    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...
  5. nRGee

    Condensate formation in start-up steam line.

    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...
  6. nRGee

    ON/ OFF valve on Stripper bottom rundown line in case of emergency

    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...
  7. nRGee

    Centrifugal compressor running on lighter gas than design

    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
  8. nRGee

    Minimum distance on start-up steam line

    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...
  9. nRGee

    Compressor anti-surge line_Flow orifice placement

    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...
  10. nRGee

    Check valve on flare sub headers

    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
  11. nRGee

    Flare stack height

    Thank you all for your valuable responses. I got the answer to what i was exactly looking for.
  12. nRGee

    Flare stack height

    Does draft and pressure drop across the flare header play any role in determining the stack height?
  13. nRGee

    Flare stack height

    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.
  14. nRGee

    Barometric Leg

    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
  15. nRGee

    Barometric Leg

    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...
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