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  • Users: colar
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  1. colar

    Belt Conveyor Volumetric capacity

    I am doing a preliminary analysis on increasing the capacity of a troughed belt conveyor. I have an older copy of of the CEMA standard (5th edition). In that edition there is no discussion on how much extra volumetric capacity one should design for to account for slippage or whatever. In the...
  2. colar

    B31.3 Catergory D Fluid Service

    In B31.3 in appendix M it steps through a flow chart to determine the fluid service for the piping application. It has one soft requirement that I am looking for help in defining. When you get near the end of the chart towards the category D fluid service side, the final question is if the...
  3. colar

    WOG or CWP Valve for Steam

    I have an existing system that needs evaluation for compliance to B31.3 (as referenced by our local boiler code). The system is a deaerator for boiler feed water. One thing I have noted is that all of the ball valves on the unit do not have WSP ratings. Four have a CWP rating (1500 psi) and...
  4. colar

    Partialy filled pipe

    I have a couple related questions regarding typical pipe flow in an open system. 1. In a pipe line, how can you predict if the pipe will be full or not? The flow calculations would seem to change radically based on the assumption that the pipe is filled vs. not filled. 2. Assume there is a...
  5. colar

    Pump Curve - Outlet Pressure or Pressure differential

    I am having a brain cramp today. Haven't worked with pumps much for a few years. If I want to use a pump curve to estimate the flow in an existing pump system, and I can measure the pressures at the pump, do I use the difference in pressure (Pout-Pin) to correlate to the pump curve, or do I...
  6. colar

    Pipe System - Flow Calcs - Tie Ins

    I am wondering if anyone has either a good reference (by good I mean more practical than theoretical) regarding calculating flow rates in new additions to existing pipe networks. Would also appreciate a couple of key thoughts or general attack steps in how something like this could be analyzed...
  7. colar

    Direct Stress

    Does anybody have a good definition for "Direct Stress"? I have been asked as part of an upcoming job interview to prepare a short 10 minute lecture aimed at first year students regarding the principles of direct stress. Direct stress to me is simply tensile or compressive stress created by...
  8. colar

    Tube-Inside-Tube Beams

    Has anyone ever used a smaller cross section HSS member inside another HSS member (i.e. a 2.5 x 2.5 x .125 inside a 3 x 3 x .188) to stiffen/strengthen a beam. I am considering this becasue of size constraints on the outer envelope of a beam. I realise this is an inefficient use of material...
  9. colar

    Astm d523

    Can anyone give me any info on astm d523? Am looking for information on the test method. Mainly, is the angle measured from horizontal. Is there a way to compare tests at different angles? A copy of the standard would be great.
  10. colar

    Use of Percent Elongation Numbers

    Does anybody have an engineering method for actually putting percent elongation numners to use? We all know how the numbers are arrived at, but how can the numbes be used in a mathematical formula to help an engineer in selecting a material? This stems from a problem we are currently having at...
  11. colar

    Orifices in hydraulic systems

    I am looking for some advice regarding a hydraulic circuit I am having a problem with. To try to summarise; We produce an agricultural implement that has two folding sections on it. It is important that these sections fold in the proper order. Previously, the order that the sections folded...
  12. colar

    1144 stressproof

    Has anybody ever had experience using 1144 stressproof as an axle. I would like to economically increase the strength of our C1045 CR axles. 1144 is an alternative. I have heard some concerns abut "11" series steels having poor fatigue properties. These would be fixed axles...
  13. colar

    3 phase power measurement

    I am doing some work using a 3 phase motor. In order to get the information that I require, I need to determine the output power of the motor. I have been using a multimeter to measure the current through the three wires (red, white, black) and to measure the voltage. My question is, what is...

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