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  • Users: knapee
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  1. knapee

    Total condenser area must greater than partial condenser?

    Dear Latexman Thank your professional help to remind me that non-condensable gas will be cost a lot of heat transfer area. But, only the molar fraction of the non-condensable, such as 0.98~1 could increase the heat transfer area a lot. Is that possible that the molar fraction of the...
  2. knapee

    Flowmeter Specification

    Dear sheiko Information required from the Process Engineer to be provided in the flow data, includes the minimum, normal and maximum flows, pressures, temperatures and alarm set points. The positive displacement flow meters now are the best flow meters currently available for fluid flow...
  3. knapee

    Total condenser area must greater than partial condenser?

    Dear Sir/Madam I wonder that the area of total condenser(TC) should be greater than partial condenser(PC) or not. I got a weird htri result: the area of TC I got is less than the area of PC. (Pls see the process drawing is attached in the post) The air/solvent is purged and dosed in the...
  4. knapee

    TSHH( Very High temperature discharge compressor shutdown switch)

    Dear Sir Usually, there is three TT location around the centrifugal compressor. One is Located in the inlet line of compressor suction drum, the other is located in the compressor discharge line, and the last is located in the after-cooler of the compressor discharge line. If the compressor...
  5. knapee

    Inclined condenser area sizing help

    Dear eng-tips members: The toluene 1000kg/hr + Air (O2~10%,N2~90%) 909kg/hr dosing and purge to the reactor to make an exothermic reaction. (Process drawing is attached in)The toluene will be flush up to the top 2 inclined condenser to recover the Toluene back to the reactor(vol=2kL). I have...
  6. knapee

    Vertical type heat exchanger query

    In the design of acrylic acid total condenser (horizontal) for the epoxy acrylate reactor, Acrylic acid (10%) and air (80%) in the tube side was cooled from 80 C @0.5 kg/cm2g to 50 C@ 0.2 kg/cm2g by using cooling water (shell side inlet = 30C@ 3kg/cm2g, and outlet = 40C @ 2.3kg/cm2g). Cooling...
  7. knapee

    Vertical type heat exchanger query

    Please check this is fall film condenser or not. The tube side inlet have mix vapor of Cyclohexane, toluene, and water. Cyclohexan, toluene, water, and nitrogen gas interacting each other and behave like no-ideal case to make thermodynamics calculation difficult. HTRI may be used for in this...
  8. knapee

    Vertical type leaf filter pressure drop and maintenance

    Dear Sir/Madam Could anyone kindly help me which vertical leaf filter vendor provide GA drawing and pressure drop calculation formula in their Company website ? This vertical leaf filter will be used in the pump suction side for the oligomer production plant. Usually this type filter pressure...
  9. knapee

    Latent Heat For Multi-component Hydrocarbon Liquid

    Dear Sir/Madam Could any pro kindly explain to me the rigorous Hysys method to calculate the latent heat of vaporization of mixture posted on the following webiste. http://webwormcpt.blogspot.com/2008/06/determine-latent-heat-and-maximum.html The confusing step is following adapted from that...
  10. knapee

    How to fix poor VLE data when sizing S&T exchanger?

    I notice I have to input the reboiler type, either thermosiphon reboiler, or force reboiler.( In this case, it is thermosiphon type). Also, the required liquid static head, and inlet pressure location (either at inlet nozzle or at column bottom) have to be inputted. But, I don't quite know how...
  11. knapee

    How to fix poor VLE data when sizing S&T exchanger?

    Dear Sir/Madam I have a project given poor S&T thermosiphon & VLE data and to be required to find optimum size exchanger through HTRI. The TEMA type : NEM ( vertical), shell per unit : 1, in series : 1 Tube dimension: OD 19.05 mm, length:3048 mm, pitch: 23.81, flow angle:30 degree The Shell...
  12. knapee

    Temperature profiling software

    Matlab may fit your requirement, and you may check the google to find a lot of matlab book applied in heat transfer area.
  13. knapee

    Help BEU type heat exchanger design

    Dear Sir Someone suggest me that I should change the tube layout angle from 30 degree to 60 degree to make the vibration warning disappear. And, indeed it really happened. But, I just don’t get it why the rotated triangular (60) and triangular(30) will make so much different, and it seems that...
  14. knapee

    Best location of Anti-Surge Valve

    Dear Sir There is much more risk for this anti-surge problem in multistage compressor than that in single stage compressor. Therefore, it is difficult to control only one recycle (or bypass) line with one anti-surge valve (from compressor discharge back to compressor inlet) for this anti-surge...
  15. knapee

    Help BEU type heat exchanger design

    Dear Sir I have to correct my last post again, and very sorry for this kind careless. The shell outlet P should be 0.1 barg instead of 3barg. The shell inlet/oulet nozzle is 400mm class 150 WNRF, tube inlet / outlet nozzle is 100mm class 150 WNRF. The tube layout (please see attachment) The...
  16. knapee

    tube sheet pitch / design

    Usually tube layout patterns may be triangular, rotated square, rotated triangular, or square. Except, the reboilers triangular pitch is usually preferred since the exchanger costs are less per square. Tube pitch is the centre to centre distance between the tubes, and tube pitch to tube...
  17. knapee

    Help BEU type heat exchanger design

    Dear Sir Please forgive me because I have some typo in the last post. 1. The tube outlet P=3.075 barg, delta P=0.7bar(allowable), and the shell outlet = 3.7barg, delta P =0.075bar(allowable). 2. This is rating problem, but I don’t the number of shell and tube passes, diameter and number of...
  18. knapee

    Help BEU type heat exchanger design

    Dear Sir It is desired to cool down 1260kg/hr of Mixed Gas having properties in below table from 70 C to 15C. This operation is performed with cooling water (56000kg/hr) from 10C to 20C. (Note tube side inlet p=3.075barg, delta P =0.075bar Shell side inlet p=3.7barg, delta P=0.7bar). The...
  19. knapee

    Is Very small LMTD reasonable for the 2-2 type exchanger in the real w

    Dear Sir/Madam I got the temperature profile result (please see the attached file)from my designed 2(shell)-2(tube heat exchanger), but this result seems not reasonable. I can only see one reason behind this in the following : 1. The hold side outlet temperature of heat exchanger(44 C) is...
  20. knapee

    PSV set point.

    Dear Sir/Madam I wonder could you use breather valve sizing software to sizing this air receiver valve. You may check the software in the web.(GROTH's sizing program) Please forgive me if my suggestion is silly.

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