Search results for query: *

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...

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

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...

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

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

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...

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

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...

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...

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...

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

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...

Hi! Is it possible to output only the plastic portion of the principal strains in Autodesk Nastran? If I've understood correctly these results are relevant when checking Local Failure Criteria acc. BPVC 2/3 My workaround so far has been to subtract the proportional limit strain from the...

Hi all! I'm currently checking a subsea component (copper alloy UNS 63200) according to BPVC DIV.3 - Hydrostatic Test Criteria (KD-236). But, i'm a little confused by the wording, and was hoping someone could clarify the procedure or correct me: My understanding so far: 1)Ideally...

Hi all! Suppose you have this two storey wall diaphragm: I am curious about how to distribute the vertical loads (load from roof, snow, wind, floor etc.)and verify that deflections above the windows are small enough. All studs are spaced 600mm apart (except around windows) I've marked...

Hi all! Do you guys know of any method (codes, handbook etc.) that lets you calculate the required preload for a bolt used in tapped holes of weaker material than the bolt itself? My specific case: A4-80 bolt (yield = 600MPa) bolted in tapped hole of 316L steel (yield = 220MPa) I did see a...

Hi all! I'm wondering if anyone had some thoughts to the proposed beam-to-beam connection shown below, that consists of two angles on either side of the web with a support plate on the transverse beam. I've googled different beam-to-beam connection and did not find this particular, so i'm...

Hi! Does anyone know of a design code that deals with cross sectional capacity of pipe subjected to moment, tension and internal pressure? Or know of any other references (with formula)? For the sake of argument let's assume a catilever pipe with internal pressure and tension and horizontal...

Hi all! I was wondering if anyone has a good (accurate) technique for constraining an unsymmetric multi bore pressure-containing component? I've attachted an illustration of a model: Suppose each bore can be pressurized independantly (load asymmetry). e.g. in one load case two bores have...

Hi all! I was hoping someone could clarify the rational behind selection of hardness test location after final machining on pressure containing parts (PSL 3 subsea application)? Background/context: For the most part API 6A will be the governing standard in my case, according to 10.4.1.4 parts...