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  • Users: Iomcube
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  1. Iomcube

    Calculating Total Electric Power Input kW 3 phase Motor

    I am attaching motor nameplate (its an Cl2 compressor) The running ampere on the meter (it varies with throughput) is now 320A According to this post (https://www.eng-tips.com/threads/actual-work-380v-vs-460v.91809/post-344509) , total electric kW input will be =1.732 x 320 Amp x 380 Volt x...
  2. Iomcube

    Happy with the new platform

    On my Android tablet the response & overall browsing experıence has enhanced! Can I ask whıch platform is this? Certainly it is not php or invision
  3. Iomcube

    Valve Characteristics relationship with pipe length

    I have found x2 comments made on the use of Equal% & Linear control valves on LinkedIn I cannot understand the relationship between length of pipe & valve characteristics? Secondly per my operational experience the 2nd point is not true as even at very long Cl2 lines I can see Equal%...
  4. Iomcube

    Coupling Degeneration [multiple pumps affected]

    I am attaching images perhaps someone can provide insight as to what may be the reason & how we can avoid it. The pump in picture are brine pumps as well as vacuum pumps [both are provide by HB company]
  5. Iomcube

    Liquid Ring Compressor Polytropic Head Calculations

    I am attaching pdf & SMath sheet that provides a x3 page calculation & perhaps someone can review it. The background is I have a liquid ring compressor that vendor provides performance curve tested with air media while actually it will be used for H2. From this data I have calculated polytropic...
  6. Iomcube

    Process Safety regarding gas seal water supply

    Cl2 & H2 should never mix ...but I have a situation where I have H2 compressor, H2 seal & Cl2 seal being fed by same water line. What if x2 events happen simultaneously: 1] Supply water tank become empty so water line is empty 2] H2 seal is CS (carbon steel) & the immersed line can develop...
  7. Iomcube

    Rise in gas pressure at abrupt valve closure

    In this p&id there is a constant feeding of H2 into the circuit. Now only one consumer of H2 gas exists i.e acid furnace, which requires a bit pressurised H2 gas. If there is any tripping at the furnace at that instant vessel pressure will increase abruptly beyond mentioned setpoint. How can we...
  8. Iomcube

    Control Methodology for simaltaneous Level & Flow

    Our electrolyser produce a constant (fixed) flowrate of 10m3/hr 32%NaOH. Part of this goes to evaporation unit (for producing 50% NaOH) & part of this goes to storage tank. In the illustration I had added what is to be achieved. First level control of first tank & flow control to evaporation...
  9. Iomcube

    Plate Frame Heat Exchanger Clarifications Required

    I have gone through a Plate&Frame heat exchanger [PHE] manual by Chinese vendor & I want to share some extracts from it. The coloured lines I couldn't understand & ask people here to elaborate on these Following are extracts:  Typical working pressure 10bar  Typical temperature ranges 150C...
  10. Iomcube

    Generating Valve Characteristic Curve using Iterations

    I have Chinese valves where from nameplate I can get Cv @100% open & that its Equal%. Now I generated a spreadsheet model which is fairly simple & then used 'Goal Seek' feature to iterate values such that I get stated Cv at 100% opening. I am uploading procedure that I followed (this document...
  11. Iomcube

    Cannot get details on this % Butterfly valve

    I am attaching photos of a valve the likes of which I haven't seen before. Anyone witnessed this stuff plz share some reference links
  12. Iomcube

    Is this a Back Pressure Regulator?

    I cannot understand is it just a pilot operated SOV or a Pressure Regulator. If it is SOV I simply cannot adjust back pressure value, but why there are x2 pressure lines attached to solenoid? ref: https://www.kunag.com/index.php/product/index/g/e/id/5400.html
  13. Iomcube

    Chlorine reaction with refrigerant during Liquefaction

    The process of Cl2 liquefaction is detailed here: https://www.linkedin.com/pulse/chlorine-liquefaction-performance-monitoring-benchmark-mayank-shukla/ I have seen x2 refrigerants so far being used in Cl2 liquifier R22 & R-509. If the tubular exchanger has some leak ..say the tube side Cl2...
  14. Iomcube

    Static Electricity Problem due to high KV overhead cables

    There is a truck loading platform supported by iron columns x4 on each side. The platform will have a FRP roof as well. The whole platform is under high KV cables that are passing above it & we are having static electricity problem at the top section of each column (yellow arrow) The loading...
  15. Iomcube

    Heat of Dilution for H2SO4

    I am unable to find a suitable value for Heat of Dilution of concentrated H2SO4. I will share my calculation here as well but first I need this value to be settled. I have x2 documents 1] 95 kJ/mol https://scilearn.sydney.edu.au/firstyear/exams/chem1101/2008answers/2008-J-13.pdf 2] 71.76 kJ/mol...
  16. Iomcube

    What is the purpose of these vacuum drums at pump suction

    Can anyone explain the purpose of these small drums at pump suction. What doesn't the vendor simply use submerged pump suction directly. https://files.engineering.com/getfile.aspx?folder=9b1839c8-0763-4238-b1cc-417ce129f113&file=Screenshot_20221230_104300_DWG_FastView.jpg...
  17. Iomcube

    Claus SRU Unit ASME Section I or Section VIII

    In this process one of subsystems is : incinerator / superheater / waste heat boiler (aka evaporator) + steam drum & stack Gas burned is a tail gas from upstream SRU units... All these equipments can be visualized as follows: source...
  18. Iomcube

    K factor for reducer Ambiguity

    Crane TP-410M while calculating K values for reducer / expander only uses physical geometry of said fitting. The formulas are here: https://www.enggcyclopedia.com/2019/04/reducer-k-value/ However, in all other fittings (like valves, turns) K value is dependent on Reynolds (or Darcy frictional...
  19. Iomcube

    Steam Drum PSV Inlet losses

    @ https://www.eng-tips.com/viewthread.cfm?qid=286603 Facing similar problem: While calculating pressure losses (unrecoverable) at PSV inlet (must be less than 3%) ...We have a straight line from steam drum nozzle & PSV is attached via reducer. So X3 components friction losses are to be...
  20. Iomcube

    Understanding of Hazel-Williams

    Somebody please audit my understanding of Hazel-Williams eq. for gravity flow & pressure flow both have same form of eq. when it comes to finding velocity: V = k C (D/4)^0.63 S^0.54 But for pressure S = hf / L https://www.lmnoeng.com/hazenwilliams.php For Gravity S is the slope of the pipe...

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