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  1. Snickster

    Help Deriving Equation Behind Kellogg C-9 Graph

    I derived C-7 correctly based on the guided cantilever formulas as you can see in my first post. This considerers all the movement is taken by one perpendicular leg of the L shape. Based on this I think C-9 is also based on some variation of the guided cantilever beam equations.
  2. Snickster

    PSV for solvent thermal expansion

    Are you saying that the two lines with hand valves shown are continuation of the lines your PSV's are discharging into? I don't see the whole picture cause I don't have a view of the whole system. If you are just dumping into short dead-ended lines that go nowhere then that will not work. You...
  3. Snickster

    Help Deriving Equation Behind Kellogg C-9 Graph

    I think this is the correct derivation of C-9. Check if you agree. See sketch in my first post for members ab and bc and delta (deflection) designation which should be same as found in C-9 diagram of Kellogg.
  4. Snickster

    PSV for solvent thermal expansion

    I don't understand what you are saying in previous post. Please be more detailed.
  5. Snickster

    Help Deriving Equation Behind Kellogg C-9 Graph

    Here is a good reference for the Guided Cantilever Method from Caesar II piping stress analysis seminar notes.
  6. Snickster

    Help Deriving Equation Behind Kellogg C-9 Graph

    The method in Kellogg appears to be the "Guided Cantilever Method". This is a very conservative method and could give results for stress over two time or more the actual values. In this method flexibility of piping fittings are ignored as well as stress concentration factors, etc. All that is...
  7. Snickster

    Pressure vessel under negative Pressure

    The top of the vessel is the downstream side of the filter elements. If you are getting a negative pressure sometime then it appears at these times you are getting an abnormally high pressure drop across the filter. This could be due to clogging up the filter which indicates possibly the need...
  8. Snickster

    PSV Inlet and Outlet Pressure Drop Calculation Question

    I forgot to mention that relief valve reaction forces are considered impact forces so that they are customarily multiplied by 2 (doubled) to get the actual load to design the piping for,
  9. Snickster

    PSV for solvent thermal expansion

    My experience with piping thermal relief valves are that they are installed on the piping that can be blocked in and discharge into the same piping downstream (or upstream) of the block valve so that the flow is back to the same piping. Every section of piping between valves that can be blocked...
  10. 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...
  11. 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.
  12. Snickster

    Pulley & Winch Reaction Loads

    Do a search for "pulley force diagram"...
  13. 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 =...
  14. Snickster

    Kinematics - force analysis

    I agree with raz2.
  15. 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...
  16. 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...
  17. 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...
  18. 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.
  19. 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...
  20. 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...

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