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  • Users: hero123
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  1. hero123

    How do I calculate impeller size?

    Affinity laws are the best equations to calculate and estimte the changes, however these are constant efficiency equations. But when there is a change in impellar size, efficiency does change and hence these equations may not predict the changes very accurately, however they definitely give a...
  2. hero123

    NPSH in pipeline boosting pumps

    See the NPSH(A) calculation can be done by the following formula: in case the storage tank is open to atmosphere: NPSH(A) = P (atm)+ pressure due to height of liquid in storage tank - vapour pressure of the pumped liquid at working temeperature and pressure-pressure losses in the piping from...
  3. hero123

    relationship between the pump speed and the flowrate/flowability

    see, only solution that comes to my mind is the affinity laws as stated earlier: the laws are as follows: at constant efficiency, and at constant rpm (N) Flow (Q) goes directly as impellar Diameter (D) Head (H) goes directly as square of impellar Diameter (D) BHP (P) goes directly as cube of...
  4. hero123

    relationship between the pump speed and the flowrate/flowability

    will u explain what do u mean by flowability?
  5. hero123

    DRIPPING VALVE

    a needle valve may help as it has a very small aperture for flow outlet.
  6. hero123

    gear pump

    there is only one situation responsible for that and many reasons responsible for that situation: Ur pump is somehow not getting the fully developed desired flow, that is the suction of the pump is deprived of the fluid temporarly in a periodic manner. Reasons responsible for it: a) the fluid...
  7. hero123

    To seal or not to seal We are in

    what is the question? what do u want the suggestions for?
  8. hero123

    flow after control valve

    your question is not understood. what do u mean to say "flow temperature drop and vaporise"? if the flow temperature drops, the vapors will condense. explain ur question.
  9. hero123

    Difference between API , ISO & ASME in pumps

    Centrifugal pumps can be grouped into several types based on the compliance with industry standards. some of these groups alongwith governing standards are mentioned below: 1) ANSI Pump - ASME B 73.1 Specifications 2) API pump - API 610 Specifications 3) DIN pump - DIN 24256 Specifications 4)...
  10. hero123

    simple sump/centrifugal pump question

    sump pumps are vertical turbine type centrifugal pumps, vortex pump as far as i can judge is centrifugal.
  11. hero123

    Gas Flow SI Unit to English conversion

    here is the most comprehensive reply: the conversion factors are given below: 1 m3/hr = 219.9692 gallon (UK)/ hr = 3.666153 gallon (UK)/ min = 0.0611025 gallon (UK)/ sec = 35195 ounce (UK)/ hr = 586.58 ounce (UK)/ min = 9.776407 ounce (UK)/ sec = 35.31 ft3/ hr = 0.5885778 ft3/ min = 0.00980963...
  12. hero123

    Flow meter VS Flow indicator

    As the name suggests, flow meter is a flow measuring device used to meter or (commonly said) measure the flow. it gives the volumetric flow rate in a piping system. it can vary from a simple orifice plate to complex turbine meter where the flow rate is measured as per the rotation of the turbine...
  13. hero123

    Chemical Injection

    i am in a petroleum industry and i design all my inhibitor injection system in the horizontal plane, that is, injection from the side in the same horizontal plane. depending upon the volume and pressure of injection, the injection piping size can be worked out. if injection piping is within...
  14. hero123

    Tapped Hole in B16.5 Blind Flange

    you have to do it urself my dear,
  15. hero123

    Weights for Steel Mitre Bends

    i don't think calculation of the weight of any mitre bends is so difficult that we need a program for doing so. Step 1: calculate the total length of the bend using the formula, l=r x theta, where r=radius of the center line of the bend and theta = bend angle in radians. Step 2: Unit weight of...
  16. hero123

    Suction Pressure

    the pressure due to 25 ft water colum can be calculated as follows: p=density x gravity x height = 10.8 psig ur observation of 18 psig is not understood. in case the tank is open at the top add the atmospheric pressure of 14 psi to it. so in case of open roof tank it will be 24-25 psig and in...
  17. hero123

    sw wall thickness

    in our specifications we don't provide schedule, however we mention the dimensions as per ANSI B 16.11, but the pressure clas mentioned is 3000#. i will request you to check ur pressure class.
  18. hero123

    Slide Gate vs. Globe Valve

    hi, the two valves have different construction and hence suggested for different applications. Globe valves are closing down valves in which the closure membrane is moved squarely on and off the seat. Globe valves are used in applications where a moderate control or regulation of flow and hence...
  19. hero123

    HYDROTEST OF SDV & BDV

    no such recommendations are made in the reference codes for piping hydrotesting, refer ASME 31.4 or API RP 1110. hence, it will be better to have the valves while hydrotesting.
  20. hero123

    Temperature Dependence of Oil Viscosity

    as it can be seen from the equation above, it's very difficult to make either kinematic viscosity or temperature as the subject of formula and hence we don't have graphs directly plotting the kinamatic viscosity to the temperatures. the equation is very complex one and hence it's advised to make...

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