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  1. GasGuy

    Suppliers of 42" Fully Welded Pipeline Valves

    Does anyone know any suppliers of fully welded (as opposed to 3 piece or top entry) 900# large diameter (36" - 42") ball valves? The application is main line valves on a natural gas pipeline (i.e. buried). I know Cameron offer them, but was looking for other possible vendors.
  2. GasGuy

    Loose Fill for Buried Piping

    Does anyone know the name of a supplier for loose fill that can be used around sections of buried pipes (to allow some pipe movement)?
  3. GasGuy

    SIF for a taper on pipe ID

    Does anyone have a reference for for an SIF on a taper (i.e. the taper for butt welding 2 different wall thickness pipes together)? I am aware that the actual girth weld has an SIF of 1 in B31.3, but was wondering how much of an effect the taper has on stress intensification.
  4. GasGuy

    Golden Weld

    GregLamberson: You mentioned "The latest edition of B31.3 permits the same waiver of a hydrotest as 31.4 on “Tie-in” welds between two sections of piping that have been previously tested in accordance with the code." I have been unable to find this in B31.3-2004. Could you give me a reference...
  5. GasGuy

    Drift in Ductile Brittle Transition Temperature (DBTT)

    Metengr; Not looking for a reason to decommission vessel, but wanting to ensure I have accounted for everything in my DBTT calculation. This reactor vessel has been operating for 30 years at temperatures up to 400-500°C and the client is concerned there may be a drift in transition temperature...
  6. GasGuy

    Drift in Ductile Brittle Transition Temperature (DBTT)

    I am trying to determine an appropriate temperature margin to account for drift in the ductile-brittle-transition-temperature due to pressure vessel age. I have used API RP 579 to determine the minimum allowable temperature for the vessel thicknesses / materials but want to add a margin to...
  7. GasGuy

    How to model ship impacting pipe?

    What I'm REALLY trying to figure out from this exercise is: Approximately how much kinetic energy must a boat transfer to the pipe to cause a pipe rupture? My thinking was to apply a load to the pipe to displace it incrementally until it ruptures (not sure how I figure out where that point...
  8. GasGuy

    How to model ship impacting pipe?

    Using Strand7. What criteria would you use to determine if a leak has occured?
  9. GasGuy

    How to model ship impacting pipe?

    I would like your thoughts on how to model a ship impact on an over water pipeline. I want to determine the force and displacement required to rupture the pipe (i.e. the work). I was thinking of a non-linear analysis but am unsure of how to determine at what point a leak would begin. Any ideas?
  10. GasGuy

    ASTM A53 Gr.B Stress-Strain Curve

    By elastic-perfectly-plastic do you mean the stress strain curve would have astraight line up to the yield point and then a horizontal line from there on? Wouldn't this be very conservative as the material will keep straining until the stress gets back below the yield stress?
  11. GasGuy

    ASTM A53 Gr.B Stress-Strain Curve

    Does anyone have a typical stress-strain curve for ASTM A53 Gr.B carbon steel pipe? If not, something similar? I would like it for a non-linear FEA model.
  12. GasGuy

    Weldolet Branch vs Header Schedule

    I have a photo of a bonney forge weldolet with the following stamped on it; 6" x 12" SCH100 (header) x SCH 160 (branch) I gather this is just a standard SCH160 weldolet with a special stamp on it. What's the point of that? The weldolet won't change dimensionally for a SCH100 header will it...
  13. GasGuy

    Weldolet Branch vs Header Schedule

    If the branch and header are different schedules are the following weldolets ok; Std WT header, XS branch - buy XS weldolet XS header, Std WT branch - buy XS weldolet (will have step down to branch pipe WT). If step unacceptable for flow reasons, request weldolet bore be machined down to match...
  14. GasGuy

    Bulk Modulus of Ammonia (R717)

    Does anyone know the bulk modulus of liquid ammonia?
  15. GasGuy

    Calculated Results for Series of Input Values

    Thanks guys, I've been avoiding learning VBA until now - looks like the time has come to get into it.
  16. GasGuy

    Calculated Results for Series of Input Values

    I am using a large spreadsheet that has one input value and returns one calculated value. I want to input a series of values (say 1 to 50) into a cell and get the calculated result for each value. How can I do this without typing each input value into the cell individually? The spreadsheet is...

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