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  1. DowneastTech

    stress decay distance for seal groove

    I have a thick wall, steel shell (cylinder) with two internal seal grooves. These grooves are stress risers. Now the literature specifies a stress decay distance of k x square root of (R x t) for various types of discontinuities. The value of k used varies from Pi/2 to Pi/4 to 1.0 to 0.5 and...
  2. DowneastTech

    over-the-road vibration spectrum

    I am involved in the analysis and design of a suspension systemfor a heavy duty vehicle (oilfield). For the purposes of preliminary design I am hopeful of obtaining a rough road spectrum. Possibly, something Federal (public domain). I thought that the Army or the DOT might publish something...
  3. DowneastTech

    Material Allowable Stress Limit

    Allowable tensile stress of 2/3 of yield is used in several API specs, for instance API-6A,API-16Q, and several others. I believe American Bureau of Shipping also uses this allowable. We have used this allowable for years all over the oilfield. The 40% of yield for principal shear is AISC and...
  4. DowneastTech

    Reference Books

    Here are several books on my office shelf: Mark's Std. HB for Mech. Eng'rs Machine Design by Norton Structural Analysis by Hibbler Engineering Mathematics Handbook by Tuma Pressure Vessel handbook by Megsevy Formulas for Stress and Strain by Roark Advanced Mechanics of Materials...
  5. DowneastTech

    Packed Joints Query

    The only other source I know of for a rational approach to packing is given for the design of packing glands for valve stems and can be found in " The Valve Designer's Handbook" by Jerry Lyons. Probably Abebooks on the internet will have a copy. DowneastTech Mechanical Engineer Magnus R & D...
  6. DowneastTech

    Boiler Stack Steel Material

    A steel plate specification that might be worth considering for your stack is ASTM A736 grade B. This material has great low temperature properties, high yield strength and is a P1 steel. It welds like melting butter. However, it is not any more resistant to corrosion than any other low alloy...
  7. DowneastTech

    Packed Joints Query

    For what it is worth, a detailed study of the design and performance of packed joints was made by Stone and Webster about 15-years ago. I don't have a copy, as I recall they wanted $500 for the report. Maybe you can locate a copy through R.I.C.E. at Rice University's Fondren library. Good...
  8. DowneastTech

    thick rect. flat plate, circular hole, annular line load, deflection?

    Thank you for your input JStephan. Your approach may be workable because the L1/L2 ratio should not vary, at least I expect very little variation. The Opening will remain about the same size too. The loads will the variable with greatest range. DowneastTech Mechanical Engineer Magnus R &...
  9. DowneastTech

    thick rect. flat plate, circular hole, annular line load, deflection?

    At this stage, I am doing preliminary work to develop a "generic" procedure. I wa told that I will be assigned the analysis of a piece of equipment where this particular problem is the central issue. So, no I don't have dimensions as yet. Thanks for the reply, DowneastTech...
  10. DowneastTech

    thick rect. flat plate, circular hole, annular line load, deflection?

    I am trying to determine the maximum deflection for a thick, rectangular, flat plate with a central opening and annular line load about the opening. The support is fixed along the two short edges. I have made literature search for an already developed equation that fits this case, and haven't...
  11. DowneastTech

    Galling - Stellite 6 self mated pair

    Just a suggestion. You might consider running stellite #6 against Colmonoy #5 this combination runs together remarkably well in all of the conditions I have used it in. DowneastTech Mechanical Engineer Magnus R & D, Cypress, TX
  12. DowneastTech

    force to penetrate of slip teeth into pipe wall

    I need to calculate the force required to indent slip teeth into pipe od to a given depth of a few thousandths of an inch (variable). It is a plastic-flow problem that so far eludes me. The teeth are much harder than the pipe and the pipe is ductile steel. Strain hardening need not be...
  13. DowneastTech

    BX ring gasket seating load

    Thank you for your thoughtful reply. All of the API-6A 15000 psi flanges were designed per the Eichenberg paper published by ASME in the Journal of Engineering for Industry, circa 1966 and have a mandatory requirement that the flanges meet face to face. You are absolutely correct that the...
  14. DowneastTech

    BX ring gasket seating load

    Since API-6A, BX type ring gaskets, first contact the ring groove with a initial standoff of approximately 1/8-inch, how do I determine the bolt load necessary to bring the flange faces into contact, as required for this type connection. We are having trouble accomplishing face to face contact...
  15. DowneastTech

    analytical mechanics off coiled-tubing

    I have looked high and low for journal papers etc. with little luck. In order to design a coiled-tubing reel one needs to calculate the applied loads. For a given tube size/material, tube tension, number of layers, and core radius, how may the normal spreading loads and radial compressive...

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