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  • Users: PuffJr
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  1. PuffJr

    Can one edit xrefs in place using AutoCAD LT?

    I know this capability is not available in AutoCAD LT 2006. Does it exist in later versions (which ones), and is it fully functional?
  2. PuffJr

    Pressure Loss in Reducing Fittings

    Does anyone know of pressure loss data (preferably K or Cv values) for standard strength (~ sch. 40), butt-welded, reducing fittings? Thank-you.
  3. PuffJr

    Air Eliminator Design

    I am designing a custom vertical air eliminator for use with viscous liquids. Similar units that I have seen all contain a vertical baffle, but there is no consistency as to which nozzle - inlet or outlet - the baffle lies closest. On one hand, it makes sense to exit from the larger chamber...
  4. PuffJr

    Connections on Bulk Liquid Tanks

    I have been catching grief for having threaded connections on bulk liquid tanks. The knock on them is that they can easily be broken (with which I agree), and that the breach will be difficult to remediate if a break occurs (which I consider less valid). In my mind, the breakage risk is more a...
  5. PuffJr

    Suction Vortex Suppression

    I have seen some equations and tables to determine minimum static head for vortex suppression, but I think that they apply specifically to water. I am working with more viscous fluids. Is there a method to evaluate the effect of viscosity?
  6. PuffJr

    Back Pressure Regulator: F sub L

    I am looking at a table of Cv vs. % Build for back pressure regulators. All values are for F sub L equal to .9 What is F sub L?
  7. PuffJr

    Back Pressure Regulator Behavior

    A fluid is stored in a tank, and is fed to a particular process through a few hundred feet of pipe using a PD pump. A v-port ball valve at the process controls incoming flow, and the inlet pressure at the ball valve is limited by a back pressure regulator at the storage tank. The set point of...
  8. PuffJr

    Bypassing a Lot to Move a Little

    I plan to use a centrifugal pump to mix the contents of a storage tank by recycling 590 gpm. I am also considering using this same pump to deliver 40 gpm to a process. To enable this, I would bypass 560 gpm back into the tank. This approach would save a pump purchase, some piping, and an...
  9. PuffJr

    Tank Cooling Time

    I would appreciate help in estimating the time required for the contents of an insulated liquid storage tank to cool from a know maximum temp. to a known minimum temp. The ultimate goal is to determine the number of heating pads to install. I have easily determined the number of pads needed to...
  10. PuffJr

    Back Pressure Regulator Sizing

    A process to which I am pumping liquid has maximum allowable inlet pressure associated with it. I am being asked to limit the pressure of the incoming liquid using a back pressure at the tank from which I am pumping. I would appreciate some help in mastering back pressure regulator terminology...
  11. PuffJr

    Pump Suction Uptake Vortexing

    I have some pumps that are under-performing, and my local Viking guy has suggested that this is the result of vortexing inside the tank I am pumping out. We are seeing about one-half the expected flow. (I don't know how the pumps sound; they pumps are at a remote location, and I am getting...
  12. PuffJr

    Pump Suction Heaters

    I have been asked to investigate the use of pump suction heaters for viscosity control of lube oils. Initial web searches have turned up a couple possible sources for these heaters, but I have not located good general application information for them. Are there particular temperature and/or...

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