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  1. TZellers

    Apparently, not your typical TITLE BLOCK question...

    Thak for the input and I appreciate the contractual side of it. For future reference and perhaps more philosophical in nature, how do you treat this request in the future? I failed to appreciate the intellectual property considerations initially and therefore would like to understand what is...
  2. TZellers

    Apparently, not your typical TITLE BLOCK question...

    I did a search ten pages deep, but did not find a question/answer to what I'm looking for. My company has been awarded an order for our industrial equipment where the customer wants all 2D drawings with their title block and border. This has caused some consternation in our Engineering...
  3. TZellers

    Bearing arrangement for pump load

    I'm looking for pros or cons to arrangement of thrust and radial bearings for pump use. I do have the "Bearings in Centrifugal Pumps" by SKF (1995) which shows the various arrangements, but doesn't go into enough detail IMHO. The classic arrangement I'm used to is having a thrust bearing...
  4. TZellers

    Pump selection help needed for tank circulation...

    Sorry for the delay. My LG book is low on engineering inof, no max temps, no speed limits indicated. The curves only show 2 pole 50 and 60Hz performances.
  5. TZellers

    Pump selection help needed for tank circulation...

    I don't have my LG book handy, but in support of what Scipio said, just about all of the March or LG mag-drives spin at 3450. These mag drives usually have stationary shafts with impeller/magnet assemblies that rotate around them. This setup requires a spider/thrust bearing located at the...
  6. TZellers

    Drawing Number System - Do you still indicate dwg sie in the code?

    CBR: Yes, they do. However, our current drawings are mostly A size anyway. This new product line will be physcially much larger and better suited for at least C. And, most of the work will be done in-house (my hope anyway).
  7. TZellers

    Pump selection help needed for tank circulation...

    Well, you may want to consider a duplex positive displacement pump, but I'm not what temperature limitations they have. If you do go for a centrifugal pump, I would recommend a low speed pump for several reasons, namely the lower PV values on the mechanical seal (sealed pump) or plain...
  8. TZellers

    Drawing Number System - Do you still indicate dwg sie in the code?

    IF the drawing contains different data, i.e. thicker walls, more gussets, etc, then it should NOT (IMHO) be a "table" drawing, i.e. a common drawing with a table of materials and part numbers. It would indeed be a different drawing and drawing number altogther. Here's an example of a p/n I've...
  9. TZellers

    Drawing Number System - Do you still indicate dwg sie in the code?

    Thanks again for the input, which substantiated my view that drawing size does not belong on the drawing numbe, which I have seen with at least 3 other pump companies (pre-CAD, however). MintJulep: I have been thru the analysis of significant PART numbers and agree that insignificant PART...
  10. TZellers

    Drawing Number System - Do you still indicate dwg sie in the code?

    Not very helpful in my case, but interesting none-the-less. Help me understand the systems you are used to. If you design a valve body for 3 materials: carbon steel, 316L and C20, each part would have its own unique p/n, but all would call out the same drawing number, which makes sense so far...
  11. TZellers

    Drawing Number System - Do you still indicate dwg sie in the code?

    ctopher: In my experience, the part number and drawing number are different. The way I see it, this is a must in manufacturing, as often times there are multiple materials involved for a given part and maintaining two drawings for each is unconceivable. For instance, we manufacture pumps in...
  12. TZellers

    Pump selection help needed for tank circulation...

    Scipio has a great idea if you just looking to keep things at even temps. sodium Hydroxide is troublesome when it comes to mechanical seals and even magnetic coupled pumps, although I would have to give the edge to the mag-drives (unless double mech seals are involved).
  13. TZellers

    International Pump Users Symposium

    No thanks. It'd be cheaper to just send my latest brochures to the competition (from the pump mfg/exhibitor side of things) Actually, I haven't been since about '97 or '98 and it was slow then.
  14. TZellers

    Drawing Number System - Do you still indicate dwg sie in the code?

    I'm working on developing a new (and significantly improved, hopefully) drawing number system. Many of the systems I've seen in the past included a character within the drawing number that indicated the drawing size (either small, medium or large or A, B, E, etc). Is there any reason to do...
  15. TZellers

    Transformation of manual drawings to 3D CAD

    Been there done that. Scan and pdf for file keeping. Start from scratch for 3D models. I've found the SW toolset is pretty good as The Tick points out. Inventor (V6) did not have the bitmap feature. Also, SW allows you to print your sketches at scale, so you could print and compare to the...
  16. TZellers

    Lofting 3D sketch to 3D sketch - which program?

    Thanks. I'm not a SW guru, but familiar enough to think it is a major work around.
  17. TZellers

    Lofting 3D sketch to 3D sketch - which program?

    Non-planar sketches? Project a planar sketch onto a sphere and repeat. If you can select the non-planar sketchs as loft sketches, I'll be a monkey's uncle as the saying goes. I want to create what is known as a Francis vane impeller, which has a double curvature to the vane geometry. There...
  18. TZellers

    Lofting 3D sketch to 3D sketch - which program?

    I've got Inventor 6 and SolidWorks 2005. Neither program handles true 3D very well. So if I want to loft between two 3D sketches (i.e. NON-PLANAR), what program will do it?
  19. TZellers

    Droop Instability

    I've seen many performance curves are more artwork than reality. Take the NPSH curves for instance. They always draw them straight back to shutoff, when in reality they should rise. Sales and marketing folks, eager to get their numbers, will always fudge things to achieve their goal. A...
  20. TZellers

    Drooping head pump head curve

    Some notes from research that helped reduce or eliminate droop: Apply a 15 degree or greater bias on the b2 diameter, i.e. trim the impeller so that the front shroud diameter in greater than the rear shroud diameter (equivalent to 15 degrees as viewed from the side. Take into account the...

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