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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

    The question really isn't whether it is my decision. The question really is under what basis can I make this decision? That is why we normally turn to code.
  3. 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...
  4. colar

    WOG or CWP Valve for Steam

    My concern was that the valves don't have an official WSP rating. I didn't know if this was a requirement. Or if this could be overcome with temp vs pressure rating.
  5. colar

    WOG or CWP Valve for Steam

    Both valves are made to B16.34. I missed adding in my original post that those temps are at 25psi. The valve spec has a temp vs pressure graph.
  6. 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...
  7. 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...
  8. colar

    Pump Curve - Outlet Pressure or Pressure differential

    Just to fit the pieces together, would the outlet gage alone be showing pump pressure+fluid height+atmospheric pressure working above the tank? Or is the Patm cancelled out? (for the shut off scenario).
  9. colar

    Pump Curve - Outlet Pressure or Pressure differential

    Thanks for the help. A related question. This pump has a flooded inlet via a raised tank open to atmosphere and I want to find out if the shut off pressure matches the pump curve supplied. We run the pump with the outlet valve closed. Since there is no flow through the pump there are no inlet...
  10. 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...
  11. 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...
  12. colar

    What does rating 3000,6000,9000 means as per ASME B 16.11

    I notice in many specs that people put the pound sign as in "3000#" fittings beside the spec. Again is this just classification as opposed to reading anything into the lb symbol (like as in psi)?
  13. 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...
  14. colar

    Tube-Inside-Tube Beams

    pylko I will drill and weld the tube anyway. Even though the shear connection is not needed, it is probably the easiest from a mfg point of view and the best way to ensure that there is contact right from the start. So after all that, I am going to do what I was gong to do from the start, but...
  15. colar

    Tube-Inside-Tube Beams

    I think the way Prex has put it has finally managed to sink in to my own mind. That is "as slong as they start bending at the same time (i.e. shimmed properly) they will add together and Itotal=Ibig+Ismall. This is no different than if they were tied to each other side by side.&quot...
  16. colar

    Tube-Inside-Tube Beams

    Thanks for the info everyone. Obviously there is a wealth of varying opinions on this subeject! Those of you who are of the opinion that a shear joint is not needed, I agree that if the assembly would work at all there needs to be contact to transfer the loads. However, I still don't have a...
  17. colar

    Tube-Inside-Tube Beams

    So do I have two opposing views between Lcubed and dlew? i.e. is there transverse shear that needs to be picked up as well?
  18. 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...
  19. 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.
  20. colar

    Use of Percent Elongation Numbers

    Thanks for your posts. Some more info; These castings are to be used on agricultural equipment. Bearings are pressed in to machined cavities in these parts. In some of the hard ones, we have had cracks form from this process. They are subject to all manner of loads, from impact to fatigue...

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