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Recent content by patibar

  1. patibar

    Movable multi hole orifice

    Dear Mr. Casflo, Thanks for your input. Actually we are looking for it only. I would request you to provide the vendor details. We need to provide a differential pressure of 4 Kg/cm². Can it be possible with a single rotary multi hole orifice? More over is possible to install a 72" valve...
  2. patibar

    Movable multi hole orifice

    we have two restriction orifices in our sea water return line. We would like to open these orifices partially whenever choked with sea shells and plastic material. Can somebody help me in this. Can I convert the existing multi hole RO into Slide gate valve with multi hole orifice...something...
  3. patibar

    Power Generation from Sea Water Return

    In one of our unit, we kept two restriction orifices in sea water return line (72") to create back pressure for adequate sea water distribution to other units. Now the problem is these orifices are choking with plastic material, which was lined inside a cement lined carbon steel piping. What I...
  4. patibar

    Sea Water Line online dechoking technology

    In one of our unit, we have cement lined carbon steel piping for sea water (72" line and 15000 m³/h). Return line is having two multi hole orifices, which are getting choked with cement material. In 2006, we have provided one more plastic lining to protect the cement lines. But this time...
  5. patibar

    Multi hole orifice in Sea Water return Line

    One more thing is, why vibrations occur, if we install a single multi hole orifice with 3 Kg/cm² pressure drop? Thanks
  6. patibar

    Multi hole orifice in Sea Water return Line

    Dear Casflo, Thanks for your reply. I am looking for the source material. As you mentioned, first orifice should contribute 60% of the pressure drop and the second for 40%. What happens if it is reversed? Is it mentioned anywhere? Can you please address or provide the source material or can...
  7. patibar

    Multi hole orifice in Sea Water return Line

    In Our site there are total seven plants and Sea water is supplied to some of the plants. The first plant near to the sea water supply having issues in return line. Because of high pressure drop available, we have inserted a multi hole orifice in the return line (72"). Then we found flashing of...
  8. patibar

    Designing unflooded (Self Venting) Piping

    I have calculated the back pressure considering all maximum values (Worst case scenario only). In actual conditions, the vessel will see the pressure of 0.1 to 0.2 Kg/cm²g (flare header pressure)rather than 0.7 Kg/cm²g (10PSIG) and I have considered the liquid level in between two level tapings...
  9. patibar

    Designing unflooded (Self Venting) Piping

    Dear Katmar, Thanks for your quick reply and comments. We can not provide 45° slope lines since nearest vessel is located in other area and because of routing issue, we have decided to go with this scheme (Near Horizantal Line with slope of 1:200). Acording to the literature by P.D. Hills min...
  10. patibar

    Designing unflooded (Self Venting) Piping

    Please find the attachment. Thanks.http://files.engineering.com/getfile.aspx?folder=850ff0f5-e596-409b-ac4b-f911da22facd&file=Scheme.pdf
  11. patibar

    Designing unflooded (Self Venting) Piping

    I have forgot to mention the following. Froude number has calculated based on the article by P.D. Hills, and it is coming as 0.1 which is < 0.3. Vaccum condensate is having water plus glycols and having density of 1100 Kg/m³. Thanks
  12. patibar

    Designing unflooded (Self Venting) Piping

    In Ethylene Glycol unit, recently we have decided to route the vaccum condensate of PGU Refining column two stage ejector system to an existing vessel, which is having a spare nozzle at the bottom of the vessel. The vaccum required in the column is 49 mmHg. The vertical distance between...
  13. patibar

    Storage Tank Heat Gain

    We are thinkng of transfering isopentane from iso container to an internal floating roof storage tank, and to store it. In Middle East, as you know the ambient temperatures are very high, and the isopentane boiling point is 27.8°C, we are thinking of providing chiller and maintain the tank...
  14. patibar

    Barometric Leg Design

    Dear "Katmar", You are right, only 0.7m is available for gas self venting. As you said, I have considered the leg length starting from condenser to a height of vessel inlet nozzle. the existing loop seal is of 10 ft height and 3" line. We are thinking to leverage the same in the proposed 11/2"...
  15. patibar

    Barometric Leg Design

    Thanks "Katmar" for your quick response and useful info. The height beween the condenser and hotwell is 16.5 m. The vacuum required is 49mmHgA. The Hotwell is connected to a wastegas header having pressure of 10psig. A static liquid head of 0.6m in the hot well giving me that condensate will...
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