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  1. WebWizz

    designing exchanger

    Another useful site with online calculators, including HE: http://www.engineeringpage.com Cheers - WebWizz
  2. WebWizz

    HE heat transfer coefficient inquiry!

    Another good resource: www.engineeringpage.com Provides both experience values as calculation routines. Regards
  3. WebWizz

    Calculate Total Head

    To do the calc's I always use http://www.engineeringpage.com/engineering/pumps.html choose pump conditions and just fill out the form, calculates for minimum and maximum conditions as described in the other answers.
  4. WebWizz

    Double Suction Pump Efficiency Claim 93%

    There is a good calculator on the web: http://engineeringpage.com/engineering/pumps.html and choose Centrifugal Pump Using this calculator it predicts a pump efficiency of about 90% (.894), so 93% looks just possible to me. Driver efficiency is excluded from this figure. The vendor has a good...
  5. WebWizz

    Calculating U - in heat transfer

    If you want to calculate the U value, a free webcalculator is available at www.engineeringpage.com choose heat exchanger and pick the calculation that you want. Regards
  6. WebWizz

    Natural gas pipeline velocity

    Further to the recommended velocities: try www.engineeringpage.com > line sizing Then choose process fluid (or utilities if applicable), for this line sizing calculation a combo box choice can be made - if you take natural gas the program shows a recommended velocity of 30 m/s (appr 98 ft/s) in...
  7. WebWizz

    Thermal Properties of main fluids

    Try this one also: www.engineeringpage.com choose physical properties and then physical properties pure fluids Provides exactly what you mentioned plus more. Regards, Wim
  8. WebWizz

    Quarter wavelength

    Johnab, A wave can be shifted 1/2 a wave by using a 1/4 wavelength tube. The cancelation is correct for a 1/4 wavelength with a side tube which has the same diameter as the one you are connecting it to. This would be the filtered frequency. For a frequency where the tube length equals half the...
  9. WebWizz

    Quarter wavelength

    1/4 lambda resonators are used quite a lot for reactive mufflers, for example for compressor or combustion engine noise abatement. A quarter wave length resonator is a way to 'filter out' a tone. The principle is that a wave (sinus) wave plus the same wave that is half a wavelength out of phase...
  10. WebWizz

    npsh(r)??

    If you want to calculate NPSH-available for an actual application, there is a free calculator routine at: http://www.engineeringpage.com choose pumps > pump condition Wim
  11. WebWizz

    Designing a tubebundle for heating a tank, need help

    For some of your calculations you can use the thermal calculation routines on http://www.engineeringpage.com Regards, Wim
  12. WebWizz

    LPG PUMP CAVITATION PROBLEM

    Believe you are on the right track with your calculations. A good analysis of the suction and discharge system and matching the head with the pump curve will give you the flowrate. From your description I would look expect the temperature of the fluid to be different, after all the main...
  13. WebWizz

    flow in a pipe

    OI was a little impressed with the amount of answers, but will add one anyway. In case of liquid gravity flow, the static pressure of the liquid will be equal to the total pressure drop of the pipe. So in this case the pressure drop that is a result of the piping diameter and fittings etc are...
  14. WebWizz

    flow in a pipe

    a good website to calculate this is www.engineeringpage.com The line sizing routines show the maximum velocities that are guidelines from practice. Based on capacity a line size will be provided. Good luck
  15. WebWizz

    Heat Transfer Coefficient

    Online calculations on www.engineeringpage.com choose heat exchangers and then thermal rating
  16. WebWizz

    Shell-Side Pressure Drop

    Hi, There is a free calculation routine on www.engineeringpage.com Choose heat exchangers and then the thermal rating routine. You can then choose one of the two calculation forms. Will do thermal and pressure drop calculation for you. Of course this is an elaborate calculation so filling out...
  17. WebWizz

    Pressure drop in bends when pumping viscous fluids

    Dear Rasmus, Most methods use equivalent length equations, but in fact these are incorrect for laminar flow. The method that I like is the '2k method' published in an 1981 article: The two-K method predicts head losses in pipe fittings W.B. Hooper Chemical Engineering, Aug 1981 Pages 96 to 100...
  18. WebWizz

    Effect on atm pressure for Cavitation

    Looked at the first response from Artisi, which is pretty good. As long as there is enough margin between NPSH_available and NPSH_required the pump should work OK. The vapour pressure of the liquid is a function of temperature, the problem with a high altitude is that the pressure and therefor...
  19. WebWizz

    PIPE SIZE CALCULATION

    For normal line sizing the following site helps: www.engineeringpage.com Choose > Line sizing for a list of the calculators It also has some good pressure drop / pump conditions calculation routines that can help you. Regards, Wim
  20. WebWizz

    pressure drop in LPG lines

    As long as the pressure drop is a within normal range the normal 'incompressible flow' formula can be used. Try www.engineeringpage.com - the pressure drop routines will do the calculation work for you

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