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  • Users: witchdoc
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  1. witchdoc

    Bulge in vertical storage tank

    We have a storage tank (600000 gal capacity) that has been overstressed due to freezing and expansion of the contents. The original diameter is 60'. The lower shell course has swelled to 60'-10" diameter. The tank was built in the 50's, and drawings indicate it was designed and constructed to...
  2. witchdoc

    imbedded beams

    We have been asked to provide steel beams imbedded in a concrete floor. It is our understanding that rails will be installed on the beams. Automated die spotting carts will run on the rails. The specified slope tolerance for the beams is 0.006" per foot. The available mill tolerance on...
  3. witchdoc

    Embedded beams in concrete floor

    We have been asked to provide steel beams imbedded in a concrete floor. It is our understanding that rails will be installed on the beams. Automated die spotting carts will run on the rails. The specified slope tolerance for the beams is 0.006" per foot. The available mill tolerance on...
  4. witchdoc

    Plastic bin storage with high roofs

    We constructed a 70000 square foot metal fabrication plant a few years back for a customer. It is fully sprinkled, with a design density of 0.35 gpm/sf. The eave height is about 55 feet. The building houses large metal stamping presses. The customer originally stored both finished and...
  5. witchdoc

    potassium acetate

    I am looking for thermodynamic property info for potassium acetate (both crystalline and aqueous). In particular, I need the enthalpy of formation.
  6. witchdoc

    Visio stencil for P&ID's

    I am looking for a Microsoft Visio stencil that expands the P&ID symbols that comes with the software. Does anyone have a lead on something similar to this? If not, what software packages do you use for constructing P&ID's?
  7. witchdoc

    Extracting data from excell

    I am trying to develop a spreadsheet to find instances where our accounting department might have double paid an invoice. I have dumped raw accounting data to a spreadsheet, including payment amounts, dates, etc. Currently, I sort the data by payment amount, and look for duplicate transactions...
  8. witchdoc

    Electric motor failures due to conductive liquids

    We are experiencing an abnormally high failure rate with electric motors in our processing plant. We manufacture a salt that has a high pH (12+), a very high electrical conductivity, and very hygroscopic (it absorbs water from the air). It is also very corrosive to copper. Most of the failures...
  9. witchdoc

    determining non numeric cells when used in iterative calculations

    In a building cost estimating spreadsheet, I use my final total to calculate some of the cost components. For example, my engineering and permit fees are both a function of my final cost. I set up an iterative calculation so that it closes to my final cost. This works fine until a cell goes...
  10. witchdoc

    Software to convert an AB PLC 2 program to SLC 500

    I have a 10 year old machine that uses a PLC2/16. I would like to replace this PLC with a SLC 500. Does anyone know of software to convert the program to run on an SLC 500. Does anyone know of a good source to purchase spare parts for the PLC 2? Thanks in advance.
  11. witchdoc

    Dust control on gravel roads

    Does anyone have experience with an environmentally friendly, economical dust control solution for gravel roads? I have a problem with dust during dry weather at the entrance to our plant. Currently, the crushed limestone road holds up well -- no rutting or potholes. However, the dust from...
  12. witchdoc

    Plotting of distribution curve

    Is there an easy way to extract distribution curves from a data table? We currently record bag weights into an excel sheet. We are manually generating distribution curves and identifying the number of bags exceeding tolerance. This is a very tedious process and prone to error. Any suggestions?
  13. witchdoc

    Foundations for Pre-engineered Metal buildings

    We are looking for information and design techniques for designing economical foundations for pre-engineered metal buildings. We are using classical techniques, but see some competitors that obviously know something that we do not. The difference seems to lie in the way uplift is accounted...

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