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  1. novis76

    Bending force at suction inlet?

    chicopee and Sch10Sean, thank you both for your answers. If I understand you correctly you both say that the force is directed in the same direction as when the pipe discharges. That is really interesting because it is the opposite what to expect using the momentum change method that is used...
  2. novis76

    Calculate the flow coefficient and pressure drop through valve

    If you simply want a rough estimate you could, at least for small opening percentage, assume that the flow is a ideal nozzle. Assuming no pressure recovery (P_throat=P2) the pressure drop can be calculated according to dP = 0.5*rho*Q^2*(1/Ac^2 - 1/A1^2) (Ac=throat area, assume physical...
  3. novis76

    Bending force at suction inlet?

    cvg, given Vel=10m/s (314.15 kg/s @ rho=1000, A=0.2^2*pi/4) and P_atm=0 bar(g), D1=D2=0.2 m (0.65 ft), rho=1000 kg/m^3 Pressure inside pipe Discharge: P1=P2 = P_atm = 0 Suction (smooth inlet): P1=P2 = P_atm - 0.5*rho*V^2 = 0 - 0.5*1000*10^2 = -50000 Pa Force Fx,Fy Fx=m*V*sin(90º)+p*A*sin(90º)...
  4. novis76

    Bending force at suction inlet?

    Hello, this is perhaps a stupid question but my mind is playing tricks on me. At a discharge pipe outlet a stationary force equal to F=m*V creates a bending torque at the support. If the flow is reversed - what force/torque is developed and in what direction? Please see attached figure Thanks
  5. novis76

    Built up back pressure from subcooled water discharge

    Hi, I need to determine the built up back pressure from relieving subcooled water. The water flashes in the short oulet line. Which formulas can be used to determine this pressure? Thanks
  6. novis76

    Drain rate of declined safety valve outlet line

    I forgot to post my pretty picture in the previous post. Here it is. BigInch, I agree that the depressurization rate should be very fast and not important to the total time it takes to drain the outlet. I would guess that the outflow from the pipe would be less intermittent than that from a...
  7. novis76

    Drain rate of declined safety valve outlet line

    Ok, I am not sure I am getting the same result on my google search as you (Google search result is nowadays personal/dependant on past search queries). Can you specify what I should look for? Meanwhile, what I expect is this. 1) at t=0 the pipe is filled with water. The upstream end is a...
  8. novis76

    Drain rate of declined safety valve outlet line

    Hello, I want to get a estimate on how fast the outlet line of a safety/relief valve is drained. The outlet line is rather long and the fear is that the bellow can get damaged if the valve experience a subsequent opening. The medium is water (cold) Can anyone point me in the right direction...
  9. novis76

    Total temperature, static temperature or recovery temperature as drivi

    @ ione Thank you for the reply. However, I am also interested in this question beside my task at hand (so the conservative value isn't "good enough" :) ). If the recovery factor is 0.89 then the wall temperature, assuming isolation on the outside, is: (273.15 + 10) - (1 - 0.89)*189.83/(2 *...
  10. novis76

    Total temperature, static temperature or recovery temperature as drivi

    Hello, I doing a thermal expansion analysis on a nitrogen supply line for a expansion tank. I am doing two calculations. One in hot conditions and one in cold conditions. The hot temperature is known and is no problem. The problem is the cold case. The system consists of a nitrogen tank of...
  11. novis76

    Filling of empty spray header for surge analysis

    Hello, I am doing a surge analysis of a empty spray system. The system consists of a high riser-line (vertical pipe) connected to a horizontal spray nozzle header. The riser line is drained before the pump is started. When the pump starts the pipes fill up. As a first assumption I assumed the...

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