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  • Users: quark
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  1. quark

    Extrusion Barrel Corrosion

    We are planning to use this Machine for extrusion of one HCl compound. The highest temperature zone is 180C and immediately cools down to 90C. Presently, the barrel MOC is X15TN and got corroded after taking some trials. Barrel is made of SS316 and the product contact sleeve is with X15TN. The...
  2. quark

    SS 318LL

    Can somebody refer me to SS318LL composition and properties and particularly comparison with SS316. I have been searching but with hard luck. Is there a more common name for this duplex grade? Regards,
  3. quark

    Avoiding a specific data point from chart

    Greetings, This is about a biological test that needs extrapolation by graphical means, with time on x axis and biological data on y axis. When y vaule is less than a certain value, say 1.6, I want excel to omit this point and draw the graph upto the penultimate point. Even when I am using a...
  4. quark

    -80C Walk-in Cold Room

    We are in the process of setting up a -800C cold room for product storage. The product (95% water) is stored in 20 liter plastic bags. Bag durability is under test now. The product can't tolerate exposure to -200C for longer periods. The product is to be cooled from +4 to -400C in not more than...
  5. quark

    Automatic goal seek

    I have prepared a spreadsheet to calculate psychrometric properties. This requires solving two implicit equations when the inputs are temperature and RH. Presently, I am using goal seek function. Is there a way to activate the goal seek function without manually doing it every time, when the...
  6. quark

    Free book on fluid flow fundamentals (basic) and pumping

    Found this while searching for something. Browsed through it and seems to be very good. Some of the fundamental topics of fuid flow and pumping. which were discussed in this forum, are covered. Besides the theory, there are worked out examples, as well. Definitely a good collection for us...
  7. quark

    Removing refrigerant traces from air

    The refrigerant (R134a, probably), in question, is used as a propellant for aerosol canisters. The filling is done in a closed cabinet (isolator kind of thing). There refrigerant may go into the cabinet during gassing operation or during spray checking. Is there any adsorbant or absorbant or any...
  8. quark

    Shear rate calculation

    I am doing some design work for batch concentration using ultra filtration. Just struck up with the shear rate calculation as the flow is turbulent. I am not ready with final pressure drop calculation as the process is still under trial and error method (of module selection). So, assuming...
  9. quark

    Highly purified water(HPW) distribution system

    Dear fellows! I would appreciate any comments on the scheme I am proposing for the subject matter. There are many issues with the entire distribution system but, at the moment, we are attacking the main problems. The System There is the 5kL main storage tank and a pump(on second floor) with...
  10. quark

    Help on thread378-174217

    Can anybody point me to an exact resource or method for the question in thread378-174217 Thanks,
  11. quark

    Picking data from a table

    Hi all, The case is that I have two drop down lists in a worksheet and the relevant data is another worksheet of the same workbook. I have the drop down list in the cells, say, D8 and F8. The data in D8 corresponds to pipe size and that of F8 is sch. no. I arranged the database with pipe size...
  12. quark

    Resistance of Zero D Valves

    Hi all, Can anybody throw some light on resistance coefficients of zero deadleg valves (diaphragm type) in open(fully) and closed conditions? Or atleast, some methods or pointers? Regards,
  13. quark

    Heat load of motors

    I, once again, want to bring up the issue of heat load of motors to your kind notice. I have been observing the designers using the following equations for heat load of motors, that confused me since I started learning about HVAC. Motor and driven machine inside control space - HPx2545/eff...
  14. quark

    SMACNA Duct Design Manual

    They have put draft copy of the manual for public review at, http://www.smacna.org/technical/index.cfm?fuseaction=papers Regards,
  15. quark

    Friction Factor Expressions

    I just finished writing two FAQs on friction factor expressions as per Mr Montemayor's suggestion (but I took it as an order) Friction Factor Expressions - Implicit and Explicit faq378-1236 Spreadsheet for Friction Factors faq378-1237 I am thankful to members Art Montemayor, Katmar and...
  16. quark

    Fluid friction redifined?

    Have a look into http://www.azom.com/news.asp?newsID=4922 Right time to split the forum into two. 1. Bumpy piping & fluid mechanics engineering forum 2. Smooth piping & fluid mechanics engineering forum
  17. quark

    Variable speed savings calculator

    Here is a good calculator, from Danfoss, to calculate energy savings when we use variable speed fan/ pump systems. Free download from, http://www.namc.danfoss.com/hvac/energysavings.html Regards,
  18. quark

    The Maisotsenko Cycle

    Have you guys ever experienced this equipment? They claim that the air db temperature can be reduced below its initial wbt. I have been trying for hours to understand the process on a psychro chart now at the verge of forgetting what I know sofar. But they say it works and got some awards...
  19. quark

    CCTV, Camera and Circular Reference

    Guys, Hold on your redflags for a moment(if possible) and think over. I came across this excellent(IMHO) question somewhere and here it goes. Suppose, if we focus our video camera to a CCTV screen, just focusing the screen only and not its rim, switch on the TV and camera. What do we see in...
  20. quark

    Formulae for Atm. Pressure w.r.to height

    The ambient pressure can be calculated, when we know the height above mean sea level, by the simplified formula, P = 29.92-0.001*H where, P is ambient pressure in inches Hg, H is height above mean sea level in ft. I recently came across with another formula which can be valid upto 11km height...

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