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  1. Snickster

    Closed Loop Piping-Vacuum Issue

    Considering you have the system up and running with piping full of oil with the sump partially filled with oil under steady state conditions I would think at this time there will be atmospheric to a partial vacuum in the sump, depending on how much the sump is sealed from the atmosphere, and...
  2. Snickster

    Pulley & Winch Reaction Loads

    I believe if you start with the premise that the tension in the rope is constant at all points at 5000 lbs then you can determine the components of all the reactions in your diagram. Then you can determine the resulting forces and moments on the mast.
  3. Snickster

    Pulley & Winch Reaction Loads

    Do a search for "pulley force diagram"...
  4. Snickster

    Gas Pipeline faces Higher velocity in pipeline network.

    Further to what Katmar stated, you can just use the ideal gas equation to determine what the velocity should be at any point in the line as follows: P(144)(V)(A) = m Z R T Where P = Pressure psia V = Velocity ft/sec A = pipe inside area ft^2 m = mass flowrate lbs/sec (lbs weight not mass) R =...
  5. Snickster

    Kinematics - force analysis

    I agree with raz2.
  6. Snickster

    Jacking Oil Pump Air Lock Bleed Valve

    The vent line oil level will equal the tank oil level minus the pressure drop between the tank and vent line and minus the velocity head in the suction line. Per Bernoulli equation: Ht = Hv + V^2/2g + Hf rearranging: Hv = Ht - V^2/2g - Hf Ht = static liquid head in tank (ft) Hv = static...
  7. Snickster

    Connection Between Tanks

    I guess if you want to equalize water levels in the two tanks you just open the valve in the connecting pipe. Also if you want to fill at a rate higher than the vents of one tank is designed for you could fill both tanks at same time with 1/2 water level rise per unit time and vent rate shared...
  8. Snickster

    Process Chill Water Loop for Multiple Machines with varying requirement.

    I am not an expert on hydronic systems but it looks like you have it piped up wrong. You cannot take off of a single supply/return line and dump back into it unless you have individual pump units at each machine take off to force the flow through each machine. Without a pump at each machine...
  9. Snickster

    Pump modifications

    So you are relocating the pump to reduce pressure losses in system. Why would this require changing the impeller? Regardless changing of the impeller should be done with assistance of the equipment manufacturer.
  10. Snickster

    Two Pumps of Different Product and Ratings Pumping into a Common Header

    If I were you I would start from scratch and do my own detailed hydraulic calculations. You are trying to design based on information you are getting in piecemeal. I would get the process engineers to give you a complete process flow diagram with system flowrate, process pressures...
  11. Snickster

    Flow inconsistence

    First figure out what flow you really want/need. What flow is required by your process? How much flow are you trying to deaerate in your system? 1,8 m3/hr? 4 m3/hr? Once you determine the required flowrate of your system, check the required head output of each pump in meters at that flow. For...
  12. Snickster

    Flow inconsistence

    My understanding from your numerous previous posts that you are taking existing pumps from somewhere and placing them in systems they were not originally designed for. I think that is why there is such a mis-match in stated design flow rates of the two pumps. Correct? These are some of these...
  13. Snickster

    PSV sizing acc. to IGC

    The attached Appendix 3 provides a derivation of the conversion of relief flow to standard cubic feet of air.
  14. Snickster

    PSV sizing acc. to IGC

    Also see the attached.
  15. Snickster

    PSV sizing acc. to IGC

    See attached API 2000 Appendix D and in particular D-9.
  16. Snickster

    PSV Inlet and Outlet Pressure Drop Calculation Question

    ...PSV Exit flange. For the Pressure force I think I should use the Back pressure acting at the PSV as the value for P in the formula Pressure Force =A*P, and the Area A would be PSV outlet flange flow area. In my case it would be 8" Sch 40. So A=PI()/4)*(7.98^2) Yes the momentum force at the...
  17. Snickster

    pumps

    It could be that your downstream pump system is ok and does not have very high friction losses and it is just that your upstream pump flowrate is restricted due to the high pressure drop across the nozzles to get the spray. The downstream pump even if ok can only pump what flow it is supplied...
  18. Snickster

    pumps

    If you are measuring 1.8 m3/hr on the second pump then that is what the flow really is. Your pumps may be rated for 4 and 9 m3/hr but how much they really pump has to do with the pressure loss at a given flow in your system. This is where the system curve intersects the pumps curve. For the...
  19. Snickster

    Relieving temperature PSV

    Oh you mean the temperature of the discharge considering a constant enthalpy expansion across the relief valve? Ideally the temperature upstream of the relief valve equals the temperature downstream of the relief valve adjusted for the Joule Tompson Effect cooling, and for increase in velocity...
  20. Snickster

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Pavan I will get back with you on your latest posts,

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