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  1. ChemGuy2016

    Vertical Check Valve

    Installing a sewage pumping station, can the swing check valve be installed vertically? I'm concerned about solids getting lodged in the corner of the swing hinge, blocking the swing from opening. Does anybody have experience with this?
  2. ChemGuy2016

    Flow Transmitter Settings

    Got it. But I'm guessing you'd still want to leave a bit of extra room above your maximum calculated flow rate to account for natural variation in flow conditions. Don't want to max out the flow meter at 20.000 gpm and not be able to read 21 gpm.
  3. ChemGuy2016

    Flow Transmitter Settings

    Thanks for the responses. I understand the measurement principle now. Is there a general rule of thumb of what the maximum flow range should be? I'm thinking some percentage over the expected maximum flow rate. 10%, 20%?...Just to make sure that it can still read if you slightly over the...
  4. ChemGuy2016

    Flow Transmitter Settings

    So bottom line, if the flow range is set incorrectly then I will get an incorrect reading. Yes?
  5. ChemGuy2016

    Flow Transmitter Settings

    My mistake. You are right; the flow meter itself does not report the flow. It is transmitted to a local indicator. I am using an electromagnetic flow meter.
  6. ChemGuy2016

    Flow Transmitter Settings

    danw2 can you please rephrase your response? I am having trouble understanding your explanation. I also guessed that it had to do with the 4-20mA signal, but the flow rate measurement on the unit does not depend on the transmission signal. That is raw, empirical data based on changes in the...
  7. ChemGuy2016

    Flow Transmitter Settings

    Hi everyone, I am new to instrumentation, so I'm hoping you can help me out. I'm wondering about setting the maximum flow rate of a flow meter during configuration. If I enter an incorrect flow range, will my readings be incorrect? It seems to me that the flow meter should always output the...
  8. ChemGuy2016

    Ideas for line tagging system?

    Thanks for all your replies. I took ideas from each and created my own system for this particular process. 1"-SS1-XXYY, where XX = last two digits of P&ID number from where the pipe originates, and YY = sequence number of pipes that start on that P&ID. So 0105 is the 5th pipe that starts on...
  9. ChemGuy2016

    Ideas for line tagging system?

    I know this has been discussed before, but I want to bring it up again: I would like to hear different people's methods of labeling lines on a set of multiple P&IDs. Right now I have 1"-SS1-001 (line size-pipe material-sequence number), but it gets very messy each time I add or delete a line. So...
  10. ChemGuy2016

    Measuring amount of settled solids

    What about a level sensor that does not detect clear liquids, and then sends out the level of the solid layer? Does such an instrument exist?
  11. ChemGuy2016

    Measuring amount of settled solids

    I want to be able to know when a distinct layer has been formed and there are no more suspended solids in the clear liquid phase. On a lab scale you would do this visually through clear glassware, but the tank is steel and cannot be seen through.
  12. ChemGuy2016

    Measuring amount of settled solids

    Thanks for the links. These are for lab scale, but I am wondering about an industrial scale in a 1000 gallon tank. I want to be able to know when the settling process has finished and there is a distinct solid/liquid interface before decanting the supernatant.
  13. ChemGuy2016

    Measuring amount of settled solids

    Hello! Does anybody know of a good method to measure the amount (mass or volume) of settled solids in a settling tank over time? Thanks :)
  14. ChemGuy2016

    Nitrogen pipe/valve types

    Hello! I am still new to the field, and I'm not sure about this, but is there a standard/usual valve type to use on nitrogen lines? Or can I use the same valves that I'm using on liquid lines elsewhere? For example, if I have a 1" reduce-port ball valve on a liquid drain line, would it be...
  15. ChemGuy2016

    Compressed air pressure for valves

    don1980 - I understand now. The actuating force required by the valve remains constant, so a larger piston requires lower air pressure. I see. So looks like we usually deal with up to 100 psi, and that would be for a small actuator. 40-60 psi for a larger one. Thanks everyone!
  16. ChemGuy2016

    Compressed air pressure for valves

    don1980: Why does higher air pressure allow for smaller valve actuators? I would think that smaller actuators would require a lower air pressure.
  17. ChemGuy2016

    Compressed air pressure for valves

    I am wondering, what is a common range of air pressure required to actuate control valves? Butterfly and globe. Thanks!
  18. ChemGuy2016

    Vent height above roof

    I thought there were specific codes that dictate the required venting distance. Does anyone know where to find these?
  19. ChemGuy2016

    Vent height above roof

    In terms of building safety so that the vented vapours do not enter the building.
  20. ChemGuy2016

    Vent height above roof

    For a roof-mounted tank containing combustible liquids, how high above the roof does the tank vent need to be?

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