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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...

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...

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...

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...

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

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...

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...

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...

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...

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

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

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...

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...

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"...

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...

In one of our unit, the existing barometric leg from a two stage ejector-condenser system is routed to OWS. Because of some TOC(Total Organic Comp)at utilities issue, proposed to divert the stream to other existing vessel. We have the problem of space constraint. The proposed vessel is far away...

@TD2K No There is no PSV on drum. Actually the tail gas is coming from PSA unit adsorption beds.

In Unisim/Hysys it is required to input one of the efficiency. (Adiabatic or Polytropic) Then it calculates the other efficiency irrespective of compressor type (Centrifugal/Reciprocating/Screw).

@TD2K The gas is coming from a knockout drum, which has a design pressure of 3.5 Kg/cm²g. The maximum operating pressure is 1.35 Kg/cm²g, and the filter design pressure is 3.5 Kg/cm²g.

What is the significance of using both adiabatic and polytropic efficiencies for compressors? Why we calculate both efficiencies?