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  • Users: ports394
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  1. ports394

    Project design form examples

    I've worked for small companies with a lot of learned engineers the last 8 years. I work for a small company now that has an engineering team, but it's very loosely ran. We do more meatball engineering, try quick solutions to customer problems, as opposed to detailed, defined packages that work...
  2. ports394

    Mechanical Engineer Reference Manual, Lindeburg, 10th edition

    Does anyone have the 10th edition Mechanical Engineer Reference Manual by Lindeburg? I'm looking to buy it. I spent $45 on Amazon the other day to buy some of the old resources to begin studying for the PE test. October is the first time I am eligible. Not sure yet, if I will take it, or will...
  3. ports394

    Facebook profile request during job interviews

    So I searched facebook and saw an old 2010 discussion about this. Nothing recently. http://hosted.ap.org/dynamic/stories/U/US_JOB_APPLICANTS_FACEBOOK?SITE=AP&SECTION=HOME&TEMPLATE=DEFAULT&CTIME=2012-03-20-03-22-06 Does anyone else think this is a bad practice? I keep my facebook locked down...
  4. ports394

    Small scale, product grinder

    I have a product that is very staticy, and has a very low bulk density. Basically cotton balls look like gravel compared to my product. Can anyone think of a lab, table top sized unit that might be good for grinding this? What I'm thinking is a vacuum blower connected to a cyclone that pulls...
  5. ports394

    Overclock a Baldor VFD

    I have a VS1PF from Baldor, the 15 hp, 480V, 3phase version. http://www.baldor.com/support/literature_load.asp?ManNumber=MN763 For a hours of testing, I'm going to be running a 1.5 HP motor from that drive. I've got the settings programmed in to let it run the lower HP motor etc. But one of...
  6. ports394

    Pumping out of a vacuum chamber

    I have a vacuum evaporator... the concentrated material falls into a sight glass/tube at the bottom, and we just have a hose barb connected to a peristaltic pump. The evaporator is running at 20" Hg vacuum. the pump can't create enough suction to pull material out. (Without vacuum running, it...
  7. ports394

    Verify vacuum pump information

    This is the information I got from an OEM. 4.0 CFM looks too low to me. Can someone help me verify it? Based on evaporation rate of 140 lb/hr at 26”Hg Vacuum, the following is what the vacuum pump should be sized for (this info can be sent to a vacuum pump vendor): Service Vapor...
  8. ports394

    Pneumatic motor stalls on start

    I have a small 0.33 hp Gast air motor. I've uncoupled it from the pump so I could work on it. if I start the air to the motor, it just blows through. but if i jog the shaft just a little, it picks up and will start working. Once I stop the motor, again same problem, air just blows through...
  9. ports394

    CO2 and stainless steel compatibility

    We'e looking at some drying equipment that will have its 'wetted' parts made of 304 or 316 stainless steel. I was told by someone that CO2 is not a good drying gas to run with spray dryers because at the higher temps (150C+) it can cause corrosion and damage the stainless. And so they...
  10. ports394

    Calculating volume of a gas under vacuum

    If someone could help me out with this, I'd really appreciate it. It is work related, not homework. I've got a vacuum dryer. There's a hot metal plate inside is heated with 240F steam. I'm assuming, after equilibrium that the plate is 240F. It'll be really really close. The chamber is...
  11. ports394

    Effect of pH on Black Iron pipe for steam

    What kind of effect will a pH drop in RO product water have on regular black iron pipe used to move 125 psi steam? The original pH was 6.5. It's dropped to 5.4 - 5.7. Would this much of a pH drop accelerate the rusting/breakdown of black iron pipe used to move regular cold water?
  12. ports394

    air bubbles in pump discharge

    i'm using a centrifugal pump to pump RO water. The RO water originally has some fine air bubbles. But they should leave over time. I have a flooded suction with a 2.5" suction, and about 1ft of straight pipe before the suction. I'm recircing the water right back into the tank, and it just...
  13. ports394

    RPM control of a pneumatic motor

    I'm not sure if this is the right section to ask in, but I'm a MechE, so I'll ask my brethren. I've been looking for an XP/TEFC (class 1 div 2 electrical area) peristaltic pump. A small pump for flows from 1 GPH to 10 GPH. Not necessarily those exact limits, but in that range. I can find...
  14. ports394

    Building a vacuum box

    I work with some samples that are dissolved in ethanol. Currently, we plate them, and evaporate overnight in a fume hood, and then bake them using a standard convection lab oven. It takes about 24 hours and really slows me down. And buying an explosion proof vacuum oven is ridiculously...
  15. ports394

    Removing a pipe nipple from a flange..

    This is just a technique question. I've got a threaded flange that someone put a 1.5" short nipple on it. The kind that's all threads. Is there a good way to remove that without damaging the threads? If I didn't care to preserve the nipple, I would just put a pipe wrench on it and take it...
  16. ports394

    What kind of pump is this? from Sundyne

    I've got an application where i need 400 psi, at 40-80 GPM. The fluid is water. I've been looking at some pumps to meet this.. Using a moyno style progressive cavity/pd, I can do it for $35,000 at 15hp. A regular centrifugal in a 2 pump arrangement probably a 10 hp feeding, a 75 hp pump. No...
  17. ports394

    Varying pressure drop for constant flow rate

    I'm working with a cross flow membrane at the moment.. what I've noticed is that at lower TMP's, the dP across the membrane is higher, to give me X gpm. At higher TMP's the dP is lower to give me the same X gpm. I have 2 flow meters in the line checking the flow, and the X gpm rate is...
  18. ports394

    Membrane: Varying pressure drop for flow rate

    I'm working with a cross flow membrane at the moment.. what I've noticed is that at lower TMP's, the dP across the membrane is higher, to give me X gpm. At higher TMP's the dP is lower to give me the same X gpm. I have 2 flow meters in the line checking the flow, and the X gpm rate is...
  19. ports394

    Max load for a frame..

    I've got a 1000 gallon tank sitting in a stand. The stand has a ring supporting the tank bottle (its plastic), and the 4 legs are held together by flat steel to make a boxed bottom. The tank will be filled with water and some solids. I estimate it'll be 10,000 lbs. We need to raise the tank 1...

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