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Hi, What shall be the basis for selection between normal control valve and auto recirculation valve in the pump minimum flow line. Thanks in advance.

Hi, What is the difference between an Assists Gas and Supplemental Gas in a Flare System. or both are one and the same. Thanks in advance.

Refer the diagram in the attachment http://files.engineering.com/getfile.aspx?folder=96aa6085-7ade-47c2-8d53-17cb9e9e5c7f&file=Control_Valve_Sizing.pdf

Hello Friends, I have a system in which a column(A) top vaopurs are fed to another column(B). During abnormal operation, if column(A) gets pressurised, column(A) top gases are also routed to the Fuel Gas System (Refer attachment for the scheme). Can anyone guide me in sizing the control valve...

Dejan, Bingo...! I am referring to the same arrangemnet. My query is, what difference does it make if the inlet nozzle orientation is radial instead of axial as show in the figure. Thanks a ton in advance. Dinesh S SHELATKAR Process Engineer

Thanks Dejan for a prompt reply. My reboiler is vertical thermosyphon type. Can you throw some more light as to why radial nozzle is not acceptable in the vertical thermosyphon type ? If I am not wrong, we can reduce the elevation of the vertical thermosyphon reboiler by providing a radial...

Hi, I have a query. In a thermosyphon reboiler what is a better option for nozzle orientation i.e. whether the liquid inlet nozzle shall be radial or axial? How much difference will the nozzle orientation make in the actual design of the reboiler. Thanks in advance. Dinesh S SHELATKAR...

shelatkar.dinesh@gmail.com Thanks in advance. Dinesh S SHELATKAR Process Engineer

Thanks a ton mate for the valuable information. Dinesh S SHELATKAR Process Engineer

Just for clarification Pipeline is a long series of Pipes usually of large diameter often underground with few fittings & equipment's mostly Pumps & Valves mainly to control the flow, that are laid with an intention to transport any fluid whether liquid or gas over long distances or cross...

Hi, Does anyone in the forum has some good literature on Cold Box Heat Exchanger. If yes, then please do share. Thanks in advance. Dinesh S SHELATKAR Process Engineer

As Latexman said venturi is used because it offer less pressure drop as compared to orifice. Dinesh S SHELATKAR Process Engineer

Hi, Anyone with a justification for the same. Thanks in advance.

It is very difficult to analyse the situation, because you have not provided any information, you are just specifying that HC is carried along with water. Liquid-liquid separation due to gravity is governed Stoke's Law There are various factors that affect liquid-liquid separation. Some of...

Loading and unloading of the air compressor is based on the instrument air receiver pressure. Please note that if you have more than one air compressor, there will be sequential loading/unloading of the compressor based on the decrease/increase of the air pressure. Let's consider a case where...

Hi, First of all please specify the type of Compressor in your package. This is important aspect for specifying the compressor control methodology. My initial guess is that your compressor is oil free rotary screw compressor. The oil free rotary screw compressors are generally operated by...

@ TD2K Sorry I made a blunder while writing my earlier post. I have rectified the same. Inconvinience regretted. My query is as follows: I have seen some engineers using the set pressure for PVRV less than the Design Pressure / MAWP for tanks designed by API-620. Is this a good engineering...

@ TD2K: Thanks for a prompt reply. The code says the following 1. Set Over Pressure = MAWP (API-650) 2. Set Over Pressure = 1.1*MAWP and 1.2*MAWP for Fire Case (API-620) 3. Set Over Pressure = 1.1 x MAWP or +3 psig, whichever is greater, 1.21 x MAWP for fire case (ASME) I have seen some...

Hi, I have some queries regarding storage tanks: 1. As per code, how much pressure accumulation is allowable in storage tanks (both LP (API-620) and ATM Storage Tanks(API-650)). 2. Is there any criteria for specifying the PVRV (Pressure Vacuum Relief Valve) and Blow-Off Hatch set pressure.

@ e43u8 Completely agree with you. It is pressure control rather than depressurising. We associate the word depressurising with relief during fire scenario and not during process upset. Dinesh S SHELATKAR. Process Engineer