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  1. Spoonful

    Joining API X65 material to A350 LF2

    Hi 6155, could you please shear a bit more on the issue on the welding? Hi Little inch, the design code AS2885 (piping code)
  2. Spoonful

    Joining API X65 material to A350 LF2

    Hi LittleInch, That's what I was thinking, increase the OD of the A350, so there is step from say 34 to 23 at the weld joint, looking from the outside. Should stress discontinuity/concetration a issue here?
  3. Spoonful

    Joining API X65 material to A350 LF2

    Dear Friends, I have a situation here at the joint of (pipe) DN850 API X65 PLS2 pipe to (closure) A350 LF 2 Class 1. The design pressure if 10.2 Mpa 65C, Pipe thickness used is 23mm. which is adequate for the pressure for the strength of X65 pipe. At the joint, the closure hub would be...
  4. Spoonful

    Hydro test of U or L shaped pipe spools

    Hi XL83NL, Gretins. Good feeling someone remembers me. Pipe size from Dn25 to 80, pressure ranging from 2000-8000kpa operational,so hydro testing at 1.5 of that. On site there will be pipe supports to hold the pressure thrust forces due to bends. Where our in-house hydro there is nothing...
  5. Spoonful

    Hydro test of U or L shaped pipe spools

    Hi All, we are about to hydro test some pipe spool, U shaped and L shaped. My concerning is once pipe is blanked off at ends and pressurized, the U shape or/and L shape will tend to straighten itself. Could anyone please share some idea on this? should be this be a concern? if so, any idea on...
  6. Spoonful

    Pressure Thrust in PV Elite and FEA

    It depends, If your nozzle, for example is attached with blind flange, the there will be a full pressure thrust acting on the nozzle away from the shell. If your nozzle, for example is connected to solid piping with solid anchor. Then there is no pressure thrust on to your nozzle.
  7. Spoonful

    Lateral load on cylinder

    I couldn't seems to find a case in Roark's, could anyone suggest the case number? robyengIT , your attached is very similar to my case, but I could figure out how to use your attachment? I think it is a different case as to a external pressurerised pressure vessel, as in my case the load is...
  8. Spoonful

    Lateral load on cylinder

    Hi All I have a cylinder ( OD, thickness and width known), as shown, is supported at half way, lateral force F1 and F2, say F1=F2. Would someone advise on some reference on how to find out the max bending moment at the support plane? so I can find out the max bending stress, hence determine...
  9. Spoonful

    Question on how to determine rubber backing plate thickness

    Hi All, Simplified situation, A piece of straight rubber block/strip, say 150mm (Lr) long by 30mm (Wr) wide. 30mm (Tr) thick, on top of it a steel plate os same size, 150mm (Ls) long, by 30mm (Ws)wide, its thickness (Ts) is to be determined. Force f1 and f2, action on the edge of steel...
  10. Spoonful

    2017 ASME Viii Div 1 Appendix 1-10 removed now use Div 2, but which allowable?

    Thank you FoxRox
  11. Spoonful

    Reinforced pad split into half?

    sometime you have no option but have to split the pad just in order to install them. but make sure your split line is perpendicular to the shall longitudinal axis, and have a weephole on each split of the pad, and you may want to do bubble test on each split.
  12. Spoonful

    2017 ASME Viii Div 1 Appendix 1-10 removed now use Div 2, but which allowable?

    Hi All, Since appendix 1-10 has now been removed from the 2107 edition of the Div code, we now go to use Div 2 part 4.5 for larger nozzles (ratio greater then 0.7 to 1). Which material allowable stress shall we use now , Div 1? Div 2? Vessel design code is Div 1. Thank you
  13. Spoonful

    Why is turbine Blade made by casting?

    Hi All, I was reading somewhere mentioned most turbine blade is made by casting? Made me thinking, why not forged or machined from block? I won't think cost is the reason for such high end product. My limited understanding is that investment casting generally is not as good as forged product...
  14. Spoonful

    Unity check for pin connection?

    So in that case, Von Mises here, would only have tensile stress σx and shear τxy ? I trying to understand why should bearing stress not to be considered here when combine all stresses?
  15. Spoonful

    Unity check for pin connection?

    Hi, Thanks for all the useful replies, I don't recall ASME BTH do a unity check for tensile, shear and bearing, (so doesn't AISC). I now think maybe I am being over conservative. Rotation is not a concern here, there are actually one row of 3 holes, I am dividing the load by the number of...
  16. Spoonful

    Unity check for pin connection?

    Please see attached. http://files.engineering.com/getfile.aspx?folder=fde1a226-c380-4ff9-9f85-e8f39e14f7e9&file=20160729144442438.pdf
  17. Spoonful

    Unity check for pin connection?

    Hi All, When designing the pin connection, we have tensile and shear stress and also bearing stress. Assume all individual stress are within its limit, say Actual/allowable = about 60% each. DO YOU also do a unity check? eg tensile actual/ tensile allowable + shear actual/shear...
  18. Spoonful

    Loosening Torque is 30% Lower Than Tightening Torque

    The oddity is that tightening friction is usually dynamic and loosening friction is static, which often makes items harder to loosen than tighten This is only true if the tightening process is in one continues motion.
  19. Spoonful

    UNO or UON

    Thanks for sharing your opinions. I agree that this abbreviation need to noted in the drawing tile block. But I must say I see the term "noted" more often than "specified"
  20. Spoonful

    UNO or UON

    Hello All, which one do you normally use? UNO, unless noted otherwise or UON, unless otherwise noted.

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