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  1. BruceTheEngineer

    Maximum solids flow rate for vacuum system

    So I have this vacuum blower that's designed to run at 150 CFM and vacuum air at 12" Hg through a 2 1/2" line. I'm trying to figure out the best way to go about it. Because I can calculate the velocity of the air in the line, I was going to try to rearrange the saltation velocity formula to...
  2. BruceTheEngineer

    VFD alternatives

    Sorry for my late reply. We found out that bleeding the air did save us some energy. We went from 55.6 Amp draw with no bleeding off to 45 amps when bleeding off some of the air. I need to get an anemometer to figure out exactly how much air is being bled off, but it's significant (went from...
  3. BruceTheEngineer

    VFD alternatives

    Unfortunately, these MCC buckets don't have metering panels, these were installed in the 90's and I don't want to conjecture on why they don't have a metering panel, but the only way for us to get an amp measurement is to open up the MCC bucket and use the clamp on multimeter.
  4. BruceTheEngineer

    VFD alternatives

    We had what I'll just call a "process upset" at work, so all of our resources are trying to fix that right now. Once that storm passes, I'll have to get with an electrician to pull the amp measurements (they don't trust chemical engineers to open any panel more than 50 volts). Is it best to...
  5. BruceTheEngineer

    VFD alternatives

    Yes sir, the blowers are belt driven. We have some mechanical variators on some motors in other applications at our plant, and we rarely use them because like ScottyUK said, they aren't very reliable. Besides Motovario, is there any other vendor that sells those?
  6. BruceTheEngineer

    VFD alternatives

    Hello all, Let me start out by saying I'm a chemical engineer by training, so please don't laugh at my lack of electrical engineering knowledge too hard. The problem I'm encountering at work is that our positive displacement Roots blowers are blowing too much air into our pneumatic...
  7. BruceTheEngineer

    Formula derivation for gas volumetric flow rate through hole in pressurized pipe

    Hi Compositepro, I'm looking through this manual for our blower and it says the following https://www.pdblowers.com/wp-content/uploads/2016/11/iom_185-205-ram_manual-feb2005.pdf No attempt should ever be made to control capacity by means of a throttle valve in the intake or discharge piping...
  8. BruceTheEngineer

    Formula derivation for gas volumetric flow rate through hole in pressurized pipe

    Because it's easy to turn that little gate valve that we have honestly. I don't even know if we have that option to throttle the flow at the suction of the blower. Are there benefits to throttling the suction of the blower as opposed to just bleeding off air downstream. I'm not sure if it is an...
  9. BruceTheEngineer

    Formula derivation for gas volumetric flow rate through hole in pressurized pipe

    Thanks a bunch zdas04! I took those formulas and put them in this spreadsheet and I got if I had an opening of 1" (so valve opened roughly half-way) I got the air coming out of that valve at 264.0068 SCFM. Of course I'm making some huge assumptions as a gate valve is not even close to looking...
  10. BruceTheEngineer

    Formula derivation for gas volumetric flow rate through hole in pressurized pipe

    Hello all, I have an embarrassing question to ask. I was reading through a post here http://www.eng-tips.com/viewthread.cfm?qid=219324 from around 2008 where someone asked how to calculate the gas lost through a pinhole in a pipe and someone posted a remarkably convenient formula Q = D^2 * P...
  11. BruceTheEngineer

    Vent Size For Bulk Material Receiving Bin

    As a note to all, sorry about me leaving out details, this is my first post so I'm still kind of new to this.
  12. BruceTheEngineer

    Vent Size For Bulk Material Receiving Bin

    miningman: Yeah you're right about that, if you look at the drawing of the vessel the pellets are always around where the high level alarm is at. Basically, the PLC logic is that as long as that high level alarm is activated, the bin isn't refilled. As soon as that level drops below the high...
  13. BruceTheEngineer

    Vent Size For Bulk Material Receiving Bin

    MortenA: According to our technicians, this has always been a problem but we just never had someone to really push this project. So then with terminal velocity, I'm assuming I'm looking to see if the force of air carrying the pellet upward is less than the force of gravity, right? Or am I trying...
  14. BruceTheEngineer

    Vent Size For Bulk Material Receiving Bin

    Lilliput1 & LittleInch: Can you please tell me what equation you used to get to those results just to verify. I used this online calculator at http://www.tlv.com/global/TI/calculator/air-velocity-through-piping.html?advanced=off to get near the same results as you guys and I just want to make...
  15. BruceTheEngineer

    Vent Size For Bulk Material Receiving Bin

    MK3223: Would you happen to know of any equations or standard formulas I could use to mathematically show the lift experienced by the pellets suspended in the air? I understand that lift is generated when faster air is on top and slower air is on bottom (like the wings of an airplane). Is that...
  16. BruceTheEngineer

    Vent Size For Bulk Material Receiving Bin

    Here is a dimensional drawing for referencehttp://files.engineering.com/getfile.aspx?folder=18722acb-4a52-4e14-933e-d77466cfafbe&file=Bin_Receiver_Drawing_With_Dimensions.jpg
  17. BruceTheEngineer

    Vent Size For Bulk Material Receiving Bin

    Hello everyone, Long-time reader, first-time poster. I have a question regarding how to size an open air (gooseneck) vent on a bulk solids receiving bin. First some background. I have a receiving bin that gravity feeds a polypropylene feeder. A dilute phase blower blows air at about...

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