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  1. SandCounter

    Marine Applications: U.S. 30 inch flexible hose limit

    I considered inquiring in the Marine Engineering sub-forum, but the piping sub-forum sees more interaction. I am working a project that requires portable machinery installed on the weather deck of a ship. The machinery processes water and returns the water to the ship. The unit will be moved...
  2. SandCounter

    Fuller Thomson Equation Derivation

    Hello, I am looking into ideal particle sizes to achieve max-density and came across the Fuller Thomson equation for ideal gradation %P = (d/Dmax)^n Where d is particle size, Dmax is maximum particle size found in a mix, and n is a constant. Fuller Thomson assumes n is 0.5 for spherical...
  3. SandCounter

    Project Lead the Way and Engineering Retention

    I am on the board of a local private school that is considering Project Lead the Way or similar curriculum to fill the need for STEM offerings in the school. My very limited perception of school-age so-called STEM programs amounts to playing with toys that generate interest in what might be...
  4. SandCounter

    Updating Std. Rate for Inflation

    Good afternoon. I do project estimating and have begun using MS Project over the last four months instead of Excel for it's ability to integrate schedule and costs. I have developed a Project template that I use to start each estimate. Because many of the estimates use the same labor and...
  5. SandCounter

    Mechanical Field with Minimal Regulation

    I am interested to know which industry fielding mechanical engineers would have the least regulatory oversight. The university I attended was very heavy on theory and taught absolutely nothing with regard to laws, rules, standards, etc. It makes sense that this would not be taught from a...
  6. SandCounter

    Water running sound in A/C

    Though I often deal with HVAC in an industrial setting, it is usually in spec'ing the heat transfer requirements and letting the subcontractor select and install their equipment. I have a service tech coming out to the house and I want to help point him in the right direction. My home air...
  7. SandCounter

    Incorporation by Reference. . . Standards Behind a Pay Wall

    I recently came across a website that has collected and offers for free a large database of standards documents in *.pdf form. Money is usually charged for much of this material when obtained from the source, e.g. ASTM, etc. The website's justification is that the material is incorporated by...
  8. SandCounter

    Engineering Across State Lines

    I am interested in comments from someone who has experience working across state lines. I'm sure there are exceptions, but generally, does the requirement to be licensed apply to A. the state the client is located, B. the state where the engineering work (calculations, drawings, etc.) is...
  9. SandCounter

    Partial Volume of Chemical Vapor

    Hello friends, I am reviewing a relief valve pressure setting calculation from a consultant and I have a question about partial volume. The equation used is Vchem = Pvt/Pt Where Vchem is the partial volume of the chemical vapor as a ratio Pvt is the saturated vapor pressure and Pt is listed...
  10. SandCounter

    Source for Heat Transfer Coeficients

    When I was in school, my number one question to the professor was always, "Great, I understand the physics, but in the real world, where do these givens come from?" The answer was always, "The company you work for will have the charts and tables of empirical they prefer you to use." Even many...
  11. SandCounter

    Professional Insurance . . . Getting started

    I am currently in an industry facing a downturn. While many are being laid off, others are jumping ship. I feel a commitment to see my position through to the end but have a fear of showing a gap in my employment when my day comes. I decided to do all of the paper work, fees, submissions...
  12. SandCounter

    force Calc for pipe on rollers?

    I have a pipe sitting on five rollers around the circumference of the pipe. The bottom/center roller is directly below the CG of the pipe. The other four rollers are at a 30 degree angle from each other about the center of the pipe. I am trying to find the weight distribution on each roller...
  13. SandCounter

    looking for a reference for relative roughness

    I am looking for a reference for relative roughness of different materials. I ultimately want to fine an equivalent line length for a 14" rubber hose. I have found some resources, but most have numbers for only steel, iron, PVC, and even wood, however I can find nothing on rubber. I have browsed...

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