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  1. 1athoti

    Double Bullwheel Shaft Loading

    Thank-you @3DDave good observation! I'm afraid I made a mistake on the calcs I had previously shared above. I think I should not have added the angle (in the e^f*angle) to each subsequent wire rope wind as I did. It should look more like this, in which case with a higher coefficient of friction...
  2. 1athoti

    Double Bullwheel Shaft Loading

    @mfgenggear Yes, that isn't the full assembly. Here is a better snapshot. However, can you elaborate on "Notice the design of the capstan on other are flared. Both ends." ? Yes thank you, I went through the capstan equation. I have 6 wire rope winds on each sheave. Considering Steel on Steel...
  3. 1athoti

    Double Bullwheel Shaft Loading

    Hi, I'm working on a bullwheel capstan system for underground cable pulling. Can someone give input on whether I'm approaching the loads on the shafts correctly? From capstan calcs (mainly US Navy wire rope handbook) I'm aiming for 100,000 lbf on final wrap and should be able to achieve it...
  4. 1athoti

    Bearing Capacity (Spherical Roller)

    Thank you @dgeesaman and @BEMPE16524 for the input! These would be bearings on the fairlead wheel on an underground cable puller. Yes, 1.35 SF is much too low, totally agree. The wheel has slow RPMs and could be fully loaded at stand still. That's why I was mentioning Static Load capacity...
  5. 1athoti

    Bearing Capacity (Spherical Roller)

    Hi! I have a question regarding selecting bearings based on advertised load capacity. I have a pulley with a resultant load of 142,000 lbs (A wire rope around the pulley with 100k tension. The wire rope does not wrap around 180deg but about 90deg, so vertical up and horizontal to the bull...
  6. 1athoti

    Heat Exchanger Efficiency

    Sure. I am not a chemical engineer, so I slapped it under "caustic" and "acidic" solutions... It is a milk bottle washing machine, but I expect the same / similar solution is used for other bottle washing, such as wine or beer bottles etc. I think it is a NaOH, sodium hydroxide solution and it...
  7. 1athoti

    Heat Exchanger Efficiency

    Thank you for the questions and I apologize for not giving more info to begin with. Yes, we're heating the caustic 600Gal water tank with hot water 190F. In this case it is with immersed HE inside the tank with flow only by a circulating pump, about 40GPM. There is no head to speak of. The...
  8. 1athoti

    Heat Exchanger Efficiency

    Thanks everyone! @georgeverghese, Yes, an outside shell and tube exchanger would be much more efficient. The issue, which I should have mentioned, is the fluid is caustic water which adheres / deposits to the tubes very quickly so the HE must be cleaned much more often. We use an external 890k...
  9. 1athoti

    Heat Exchanger Efficiency

    Hi @LittleInch, thank you for the input! I have a boiler of 1.25mil BTU, though it is used for multiple machines, not just the one I'm working on. We can assume 1 mil BTUs since they don't all run at the same time. The pump on the boiler is about 80GPM flow. The boiler should be able to...
  10. 1athoti

    Heat Exchanger Efficiency

    Hi, I would appreciate some input or direction on some Heat Exchanger (HE) variables. I realize there are a lot of variables in this system, but if we'd at least begin with a few. I'm dealing with a pipe heat exchanger immersed in a tank (about 600Gal of water) with a circulating pump. The HE is...
  11. 1athoti

    Destacking I-Beams

    We often move W beams like this with magnets, though I'm not sure how big your beams are. Pushing the beams calls for other issues, friction, snagging, screeching etc. If the stack is close to the saw, you could have a track mounted on two arms which would lower and activate the magnets. Lift...
  12. 1athoti

    Overturning force of stopping a moving machine

    Greatly appreciate the input! I'm a young engineer with an appetite for learning but it's tough when you're more or less all by yourself. What wouldn't I give to have a gray haired engineer with me, full of wisdom and willing to help! So I suppose you all are doing some of this (color of hair is...
  13. 1athoti

    Overturning force of stopping a moving machine

    No, I don't have any accelerometers on the machine. The speed is given by the inputs to the drive motor and the number I've given is most likely on the high side, because of various factors, drivetrain efficiency loses, friction etc. I should take a video of the machine and get an actual speed...
  14. 1athoti

    Overturning force of stopping a moving machine

    Well, it's my first post though I have been reading eng-tips for a while and I appreciate the site and contributors so much! [smile] I have a machine which rides on 2 tracks, 2 track rollers per side, and is driven by cables which pull it back and forth. The sketch would be a side view of the...

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