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  1. alan54

    Attachment of support lugs to vessel

    Thanks r6155 & TGS4, I will take a look at that PIP. Several books that say different things in passing; i.e. Moss vs Brownell & Young who say "the top and bottom plates should have continuous welds as the maximum compressive and tensile stress occurs in these two plates". I am thinking Moss...
  2. alan54

    Attachment of support lugs to vessel

    in the 4th edition of Dennis Moss' Pressure Vessel Design Manual (p. 188), he says "the base plate of the lug can be attached to the shell wall or unattached." Anyone have experience doing this? We would like to minimize heat loss; and where base sits on the structural steel is a big heat...
  3. alan54

    UHX shell bands

    can a "shell band" be added to an existing shell by welding a band to the od of the shell? i.e. can it be made from two layers or does it have to be one solid piece?
  4. alan54

    Averaging point load on API tank roofs?

    Does anyone have any rules of thumb for how much area you can spread a point load over for an API-650 self-supported conical roof? For instance, Brownell & Young show the derivation of design equations for a 25 PSF live load on a 3/16" thick roof. A 200 LB man standing with his feet side and...
  5. alan54

    Calculating horsepower for solids lumpbreaker

    interesting; definitely will consider ...
  6. alan54

    Calculating horsepower for solids lumpbreaker

    PTZ prills - phenothiazine
  7. alan54

    Calculating horsepower for solids lumpbreaker

    I've got a cone bottom silo with powdwer that bridges; the plant has tried vibrators with limited success and would like to install "lumpbreaker", i.e. rotating shaft with rod shaped side bars to keep solids broken up in lower part of cone. Shaft would be in horizontal postion coming thru a...
  8. alan54

    Edge distance for a tapped hole

    Its a small research reactor, totally machined from solid chunk of metal. Standard flanges just don't fit application.
  9. alan54

    Edge distance for a tapped hole

    Thank you all for your quick response. My bolt is strictly in tension. It is holding a blind flange on a home-made flat face studded flange which has an rubber o-ring seal (i.e. no moments due to gasket reaction or raised face). The holes in question are in the home-made studded flange. The...
  10. alan54

    Edge distance for a tapped hole

    I need to put tapped holes in the face of a piece of metal plate (316 SS). Can anyone tell me a good reference - or better yet just tell me the answer - on calculating how close a tapped hole can be to the edge of the metal plate. My current thought on being sure that I am capable of...
  11. alan54

    Mixing Fonts in Tool Tips

    Regg, Thanks again. Alan
  12. alan54

    Mixing Fonts in Tool Tips

    Regg, I'm impressed. Thanks much. Is there any way to change a Windows property from within a VB program, maybe an API call? It seems that if not, you can't do much fancy with the other characters in a font (i.e. codes 178 & 182) because you just don't know which Tool Tip font they are using...
  13. alan54

    Mixing Fonts in Tool Tips

    Regg, Thanks, that's a good idea & works with Arial. After looking at this approach, the Times Roman pi looks better but it seems the Tool Tips font is fixed (as Arial I suppose; several Fonts look similar & probably have same Chr numbers ???) because changing the label font has no effect on...
  14. alan54

    Mixing Fonts in Tool Tips

    Does anyone know a way to mix fonts in Tool tips. For example, I have a label for "Area = ", and when the cursor hovers over label, I want Tool Tip to display formula, i.e. area of a circle: "Area = (pi)*r^2". But instead of writing "(pi)", I'd rather use the...
  15. alan54

    Joint Efficiencies

    To Isthill, Nooter no longer offers that ASME Quick Reference Guide. Could you email me a copy (alan@pce-inc.com) or do you know of another location. Thanks, alan54
  16. alan54

    Automatic Scaling of EXCEL Drawings

    I'm using EXCEL 2000. Can you use the built in drawing feature and have objects scaled based on values in cells. For instance, for a rectangle, you can right click / Format Autoshape / and change the height, width, etc under the Size tab. But to set those equal to a cell value in VBA, I...
  17. alan54

    Perforated ring sparger

    Crane Technical Paper No. 410 - Flow of Fluids Through Valves, Fittings, and Pipe or most any Chem Engineering book should have orifice equations. Better yet, run web search and I have found free software for orifice calculations (sorry, don't remember sites off top of my head). Without...
  18. alan54

    Fatigue - ASME VIII-2 Changes

    I have a 1983 ASME Section VIII, Division 2 and I'm interested in the Fatigue Evaluation section AD-160. Can anyone tell me if there have been any significant changes in recent years? I know that I should be using current code but right now I'm just trying to determine if I'm anywhere close to...
  19. alan54

    Hydrostatic Pressure on a curved surface

    Not correct. This IS "pressure in a pipe". Think of it as a vertical cylinder with a east half and a west half. Pressure acts in all directions, so the force pushing on the east half is: Pressure*Diameter*Height, which is same as force pushing on west half (I hope, or tank would be...
  20. alan54

    welding rates for different metals

    I'm looking for a table that would show the relative time required to weld different metals, i.e. I've seen one source that says it takes twice as long to weld stainless as carbon steel, and 2.5 times as long to weld monel, etc.

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