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Recent content by sdtobin

  1. sdtobin

    Percent of Delivered Equipment Cost

    Does anyone have a good cost manual reference for "percent of delivered equipment cost". I need it for process equipment and not environmental equipment(i.e. reactors, tanks, process equipment).
  2. sdtobin

    Flash Vessel Sizing Methods

    Always work smarter, not harder. Check out eaton for vapor liquid separators, and I bet your process requirments are orders of magnitude smaller than their smallest units. Check out the link as follows: http://www.eaton.com/Filtration/USA/Products/SeparatorProducts/index.htm
  3. sdtobin

    Flash point / Flammablility.. definition

    Check out NFPA 325. www.nfpa.org. You should be able to view it for free however you can't print or copy and paste.
  4. sdtobin

    Good reference for safety properties..

    Check out NIOSH Pocket Guide to Chemical Hazards. http://www.cdc.gov/niosh/npg/default.html
  5. sdtobin

    Crane #410 has 400% more friction factor. Why?

    I have the narrative for why as follows: http://files.engineering.com/getfile.aspx?folder=dcdeccc4-9e5a-46a4-8326-3ca10ae3a18e&file=BizHub35020110928125442_Rev.jpg http://files.engineering.com/getfile.aspx?folder=dcdeccc4-9e5a-46a4-8326-3ca10ae3a18e&file=BizHub35020110928125442_Rev.jpg
  6. sdtobin

    Tank to Square Opening Equation

    First, Good news. I found the information in Perry's. But I am working on a secret project, and the model is analogous to chemical engineers as a square tank with a square orifice. Same paradigm, but my model could have confused everyone. I find that posting a question takes a few days...
  7. sdtobin

    Tank to Square Opening Equation

    Does anyone know the equation to calculate the area of an square orifice? The model is a closed pressurized square tank with a square orifice, and the fluid is steam. I need to control the pressure in the tank by determining the square orifice area.
  8. sdtobin

    Water Reactive 3 Explosion Venting Design Criteria

    Does anyone know the Water Reactive 3 explosion venting design criteria for in a H2/H4 occupancy? We need to meet the 2009 IFC 4404.1.6. So far, NFPA 68 regulates deflagration venting for flammable gases, dusts, and liquids. However it isn't used for Water reactive 3 materials. That's were I...
  9. sdtobin

    Exhaust duct Material and Intermittent Hydrochloric Acid Usage

    I need to specify laboratory fume hood exhaust duct for intermittent usage 25% hydrochloric acid solution. Basically the fume hood and exhaust duct system is for flammable solvents, and the everyone wants to save money. I specified a ETFE lines 304 stainless steel duct however the client wants...
  10. sdtobin

    Crane #410 has 400% more friction factor. Why?

    Good news, I notice the Perry's pipe friction loss equation has a 4 coefficient, and the chart is 4 time less than Crane # 410. Now Crane #410's chart is 400% larger, but their friction loss equation drops the 4 coefficient. Therefore, both ways produce the same numbers in the end. They...
  11. sdtobin

    Crane #410 has 400% more friction factor. Why?

    Crane #410 has 400% more friction factor in the "fiction factors versus Reynold #" table. Does anyone know why? I compared the Crane #410 table to the Moody, Trans. ASME 66, 671 [1944] friction factor table. This table is located in the Perry's Chemical Engineering Handbook in the Fluid and...
  12. sdtobin

    Ventilation of Class 1 Division 1 area

    The motor needs to be outside the air stream and outside the classified area. Then you are good. Usually 10 feet.
  13. sdtobin

    tank ventilation rate

    According to the msds, chlorine dioxide LEL is 10%. In your product conveying duct design, you need to keep the exhaust below 25% of the LEL which is 2.5% in accordance with 2007 CMC 506.
  14. sdtobin

    Natural gas and Propane pipe sizing

    I live in California, so we use the 2007 California Plumbing Code to size natural gas pipe. For natural gas, we calculate the natural gas pipe size using an equation in the natural gas section of the 2007 California Plumbing Code. Usually it's medium pressure which means greater than 2 psig...

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