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Recent content by SiggiN

  1. SiggiN

    Titanium Grade 5 stress/strain curve acc. BPVC Div. 3

    Hi! So i generated a stress/strain cruve acc. BPVC Div. 3, KM 6 But,I'm not getting a monotonic curve...Is Titanium Grade 5 not supported by the equations in KM 6? (I've checked my worksheet against ASME PTB-5 2019) Thank you...
  2. SiggiN

    Anode mass - Surface area (DNV-RP-B401)

    Hi! Suppose you have a flange connection as shown below Would you exclude the surface area of the bolts on the "inside" of the bolt holes, when calculating required anode mass? Is such an exclusion supported by DNV-RP-B401? Regards Siggi
  3. SiggiN

    PR(Performance Requirement) Requirement in API 6A Product

    Hi! This topic is very confusing, but I will try: You cannot just read API6A, for full compliance you should also read API 17D It is your own product definition that determines which tests are relevnat (e.g. valve, other end connector etc.) some of the tests will overlap Look in API 17D...
  4. SiggiN

    Is this a plane strain case?

    Hi! I cannot fully wrap my head around if I can use plane strain to calculate the stresses in my pressure vessel: - Suppose a cylinder that will see hydrostatic pressure - The housing is made in a stainless steel - But the front lid is made up of a "sandwich" consisting of different thin...
  5. SiggiN

    Tangential force

    Hi! I was wondering where does the "2000" come from in the following formula for tangentail force on spur gear? what is the logic? This formula also appears in ISO 6336 and DNVGL-CG-0036, but no reason is given Regards Siggi
  6. SiggiN

    Prevent Calcareous Layer Subsea

    Hi! Are there any metals/alloys that are inherently resistant to the formation of calcareous layer for metals subsea connected to cathodic protection system? Regards Siggi
  7. SiggiN

    Circular partial penetration weld subjected to moment

    Hi! Suppose you have two circular segments welded to a pipe as shown below (pad eye plate prevents me to use a full circle) These segments act as a "tempoary hang-off flange" and will see see a load like this: I am curious about how to verify the weld size. Initially I imagined using a...
  8. SiggiN

    PR2F Test sequence

    Hi all! Is there a requirement for test sequence when qualifying for API6A PR2F OEC? i.e. do we have to test in the same sequence as the chapters in API6A Specifically, we would prefer to test the Temp./pressure cycling (F.1.11)last for practical reasons. Regards Siggi
  9. SiggiN

    Epoxy behaviour

    Hi all! Suppose you have a cannister with the following cross section: The cannister is subject to hydrostatic pressue, that will deflect the top plate (assume simply supported) My main concern is excessive deflection of the top plate. I'm curious how the epoxy will behave over time, given...
  10. SiggiN

    Fracture Mechanics In Ceramic Plate

    Hi! Suppose you have a case like this: A simply supported ceramic disc under uniform pressure loading I am wondering the best way to determine the suitability of the ceramic, and thought I would compare the fracture toughness K_I with K_Ic However, the geometry factor "Y" and crack size...
  11. SiggiN

    Seat test pressure after reassembly

    Thank you SPDL310 and jmec87!
  12. SiggiN

    Seat test pressure after reassembly

    Hi guys! I'm trying to find a reference for Seat test pressure and hold time for a check valve we have dissasembled and now reassembled as part of maintenance. Typically we deliver acc. API 6A. As far as i can tell API 6A does not mention testing in the context of maintenance? 11.2.4 and...
  13. SiggiN

    Material recommendation for lifting applications subsea

    Hi! I'm looking for some suggestions for material for lifting applications subsea (max. 6 month submerged) WLL = 1000tonns I was thinking mooring chain steel qualities (R3, R3S, R4, R4S and R5), but would like to hear alternatives Thank you! Regards Siggi
  14. SiggiN

    Water diffusion in stainless steel

    Thank you guys!
  15. SiggiN

    Water diffusion in stainless steel

    Hi all! I'm in the process of selecting a stainless steel material for subsea use, the material will act as a housing for electroning components. This equipment shall be able to stay submerged for 15years. Wrt. preventing water diffusing into the equipment, what are the key parameters when...
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