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  1. KevinNZ

    Can Service Pressure Exceed Design Pressure?

    MAWP should not be higher than Design Pressure if the allowable nozzle loads and vessel support/skirt design are based on the Design Pressure and the built plate thickness?
  2. KevinNZ

    Tie-In Issue: 10”x10S SS316L to 24”x10S SS316L – Weld Clearance & Flange Type

    Option A welding to the thickened part the WN would likely have lower stress than the SO case. You can use FEA and compare local stress with conventual pipe on pipe weld. The design pressure and pipe loads must very low to do this in any case with no reinforcing pad.
  3. KevinNZ

    Deflection of plastic pipe

    I have not seen a defection limit in any pipping code, just stress limits. Has DVS just made this up to be conservative?
  4. KevinNZ

    Axial pipe load - how is this transferred to the pad foundation

    Nice work where there are no earthquakes to design for.
  5. KevinNZ

    Skillet blind thickness for an air test

    There should be a formula in the piping code for blinds/spades.
  6. KevinNZ

    Question on V-Loops

    link
  7. KevinNZ

    Anchor Block Sizing Factor?

    Is the PE pipe welded or sliding joints? If welded blocks are not required.
  8. KevinNZ

    750 AUD per year for Engineer Australia membership. Is it a joke?

    Engineer jailed for ‘huge’ nationwide building forgery
  9. KevinNZ

    750 AUD per year for Engineer Australia membership. Is it a joke?

    NZ was going to copy OZ and require the registration of all "engineers" but now certification will only be required for certain work. We will still have CPeng if you want it even if working in field with no statutory requirement. In OZ what is the definition of "engineer" and does this catch...
  10. KevinNZ

    Reducing bushing threaded

    I think you answer the question and vessel finishes at the 3" thread. The question now is the reducing bushing a valid piping component?
  11. KevinNZ

    ASME Section VIII Div.1 formed head straight flange (skirt) design for external loads

    A bit OT, but I have seen vessel designers get caught out with commercial software because the skirt design does not include the loads from external piping attached to the vessel. e.g EQ calculation only uses the weight of the vessel and does no add the EQ loads from attached piping. We head...
  12. KevinNZ

    Cooling Tower Blow Down Water Pipe Material

    We do need more context. But seen buried HDPE in this duty.
  13. KevinNZ

    ID Overlap between the gasket and the raised face flange

    The larger diameter gasket is easier to center on the flange by resting it on the studs.
  14. KevinNZ

    Nozzle load calculation

    Yes do allow for EQ, unless you are allowed to have the EQ rip the nozzles off the vessel. Good advice from GDD on the design process. Even plastic piping codes like ISO 14692 have allowance for occasional loads. You have not said what your vessel code is?
  15. KevinNZ

    Ring Type Flange from Rolled Strip

    Option 1 is where you would get a delamination when you cut a flange (donut) from a plate without rolling. You are allowed in the flange code to make flanges this way but not with hubs. Operating stress in a flange is from bending around the gasket from bolting load. Option 2 puts the...
  16. KevinNZ

    How to properly analyze a flange at a boiler in stress analysis?

    What programme are you using for the stress analysis? Most have model elements for vessel nozzles. Stiffness is calculated from the vessel diameter and thickness. 1/16” movement rule of thumb could be way off and non-conservative. Do include the thermal movement of the nozzle away for the...
  17. KevinNZ

    Reducer - FEA analysis

    If you making a B16.9 reducer then clause 2.2.1 applies. This means FEA plus testing or just a proof test.
  18. KevinNZ

    ASME B16.9 fittings in EN-13480 design code

    However the B16.9 fitting manufacture determines the fitting thickness (2.2.1) they will have minimum thickness distribution to apply to all fittings. They are required to provide records of the design/test (2.2.3) to the purchaser.
  19. KevinNZ

    Piping wall thickness calculation during hydrotest condition

    Most hydro leak tests do put much stress in to the pipe. Starting with the design pressure you work out a minimum thickness, then add MA and CA then select the next standard thickness. The design and test pressure is then working on pipe wall that is thicker than the minimum and the stresses...
  20. KevinNZ

    Pressure balanced axial bellows

    Hi all Which of these is the correct arrangement of tie rods for a pressure balanced axial bellows? The first one does not look right and middle has too many locking nuts?

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