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  1. wailunwu

    table UW-12

    Hi Can someone give me an example or a situation that demonstrates the use of joint efficiency E=0.85 (spot) for type 1 category D joint (e.g. nozzle neck to shell corner joint) per table UW-12 ? In what situation would this be critical in design? Many cases, I only see nozzle neck thickness...
  2. wailunwu

    Upper and Lower Transformation Temp (SEC IX)

    Hi I would like to know where I can find the upper and lower transformation temperatures for different carbon steel. Are there tables/charts for that in the code? Thanks, Alan
  3. wailunwu

    Anchor Bolt hole Sizes on Top Ring and Base Ring

    @Duwe6 Do you have any reference or calculation to size the washers?
  4. wailunwu

    Anchor Bolt hole Sizes on Top Ring and Base Ring

    PV Elite is used to design a vertical pressure vessel. It has passed the PV elite Calculations. However, PV Elite does not perform any calculations on the topring/ basering anchor hole size (just the anchor bolt size calculation). I was told that typically the diameter of the anchor bolt holes...
  5. wailunwu

    Thermal Expansion Coefficient Table TE-1 ,ASME SECION II part D

    Thank you
  6. wailunwu

    Thermal Expansion Coefficient Table TE-1 ,ASME SECION II part D

    Hi I have a vertical vessel that is in operating in cold temperature (-100 deg F). I would like to find out how much the vessel contracts vertically. Table TE-1 does not indicate coefficients for temperature below 70 deg F. Where can I find the thermal coeff for this case or information on...
  7. wailunwu

    Combining Nozzle Reinforcement Plate - API650 Para 5.7.2.9 vs Fig 5.6

    Para 5.7.2.9 states the requirement between the outer edges of the reinforcing plate fillet welds (closer than 8w or 6in). This is the same requirement for fig 5.6, column E, with shell thickness t > 0.5, as welded condition. My question is: Does Para 5.7.2.9 only apply to t > 0.5in as welded...
  8. wailunwu

    UG99b Hydrostatic Pressure

    I am referring to a vertical pressure vessel tested vertically.
  9. wailunwu

    UG99b Hydrostatic Pressure

    Hi mike I think my confusion lies in whether to add static head water pressure to mawp before ug99b calculation or add static head pressure to calculated hydro test pressure after ug99b calculation. Why do you suggest that static Head needs to be added to mawp before ug99b test pressure...
  10. wailunwu

    UG99b Hydrostatic Pressure

    Hi I am getting mixed answers with the following as I read past threads and would like clarification: When using UG99b to calculate hydrostatic pressure (P = 1.3 * M.A.W.P. * Sa/S), whether testing the vessel horizontally or vertically, I will need to ADD the water static head to get the...
  11. wailunwu

    Cone to Cylinder - Line of Support

    ASME Sec VIII Div 1
  12. wailunwu

    Cone to Cylinder - Line of Support

    Hi When designing a cone bottom vessel for external pressure, in which case would we design the cone ends as line of support and which case we should not? Should the bottom cone attaching to the cylinder always be line of support? Please advise. Thanks
  13. wailunwu

    MAWP and MDMT on vessel nameplate

    Hi I would like a clarification on the MAWP and MDMT that is listed on the nameplate. What should be the temperature that completes the following statement? Is it design temp, MDMT or operating pressure? example--> MAWP: 152 psig @ ?? deg F What should be the pressure that is used to record...
  14. wailunwu

    Seismic Design Code: G loading; Vertical Vessel with Lug Supports

    The software I am using is PV Elite
  15. wailunwu

    Seismic Design Code: G loading; Vertical Vessel with Lug Supports

    Hi I have a vertical vessel with lug supports. Client asked for NBC2010 seismic design code but I received the following warning when using NBC2010 Seismic Design Code: "Warning: This is a vertical vessel on support lugs and the earthquake type selected is a building code. Building codes...
  16. wailunwu

    Design for seismic/ windload - vessel empty of full?

    I would like clarification on the design of vertical vessel skirt, basering and anchor bolts when considering seismic/ wind load. My question is: shall they be designed assuming the vessel is full or empty? Which is the more conservative? I was told that if designed assuming the vessel is...
  17. wailunwu

    Aircraft Engine Power

    @greglocock However, mathematically speaking, should max power be at 14.7:1 (stoichiometric) ratio? The power curve should theoretically peak at 14.7:1 air-fuel ratio since both fuel and air are used up, correct?
  18. wailunwu

    Aircraft Engine Power

    HI Assuming even distribution of fuel and air in the engine, why is peak/best engine power not at peak EGT (with stoichiometric fuel to air ratio 14.7 to 1)? I was told that best power is at a slightly rich fuel to rich ratio. If 14.7:1 gives the most efficient combustion (with no excess...
  19. wailunwu

    Custom Flange Design and Gasket Requirement

    @SnTMan 1) To reiterate, since gasket m and y values affect flanges in appendix 2, Appendix 2 cannot be used without knowing gasket information? Please correct me if I am wrong. The reason is because client sometimes do not specify gasket requirement and ask us to design custom flange. 2) Do...
  20. wailunwu

    Custom Flange Design and Gasket Requirement

    From PV Elite, gasket material m and y values are required to determine the bolt area. 1) Can custom flange be designed to appendix 2 asme sec VIII div 1 without knowing the gasket (m and y values)? The flange thickness and number of bolts seem to have an effect on this. 2) For standard...

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