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  1. SteveyB

    Large Diameter Threads subject to Bending Moment

    Hi Guys, Thanks again for the replies. As I initially said this was somewhat unconventional and my immediate gut instinct looking at it was that it is less than ideal. Fortunately this thing hasn't been manufactured and I have been handed it as a concept. I was just more interested in the...
  2. SteveyB

    Large Diameter Threads subject to Bending Moment

    Hi, Thanks for the replies. Tmoose to answer you're questions, the bending moment is a constantly varying moment and is applied in multiple directions and may do 5,000,0000 cycles in a year. There are also no motion constraints. The moment is a result of the a transverse load being applied to...
  3. SteveyB

    Large Diameter Threads subject to Bending Moment

    Hi, Sorry for the late reply. I have now attached a image that will hopefully explain what I am trying to achieve. The threaded ring will basically be permanently attached to the shaft via a thread. The shaft is fixed at the opposite end to the flange and the flange end is free (i.e. a...
  4. SteveyB

    Large Diameter Threads subject to Bending Moment

    Hi, I was wondering if more of the technically adept people on here could offer some advice. I am basically after some means of calculating the bending moment capacity of a large diameter relatively short thread. So as an example a ring which screws onto a shaft which has a 500mm OD - 400mm...
  5. SteveyB

    Galling threshold of steel

    Hi, I was wondering if anyone could please offer some advice. I am interested in finding some data as to the galling threshold of s355 steel against s355 steel. As i have a possible situation where extremely high contact forces between two sliding components may occur, and need to find some...
  6. SteveyB

    Weldability of dissimilar steels

    Thanks thats good info. How do you actually go about determining this, in terms of heat treatment and filler selection?
  7. SteveyB

    Weldability of dissimilar steels

    Hi metengr, Thanks for the response. I was looking to use the EN24 in the T condition. My understanding is that stainless fillers may be used to help reduce hydrogen cracking. Is this likely to be the best approach? Thanks
  8. SteveyB

    Weldability of dissimilar steels

    Hi, I was wondering if someone could offer some advice on welding two dissimilar steels together and the possibilty of the process. Basically I have a component made from E460N mechanical tube and I need a steel of similar yield that can be welded to the tube. Due to the in service conditions I...
  9. SteveyB

    Boundary conditions on rigid bodies

    What if you wanted to apply a force to a rigid body, is this not possible?
  10. SteveyB

    Boundary conditions on rigid bodies

    I am trying to do a simple analysis in ansys (static structural) with a half spherical body pressing into a plate. The half spherical body is set to rigid in the geometry tab. When I come to put a fixed support on the circular face of the rigid body all I get is a question mark next to the fixed...
  11. SteveyB

    Corrosion rate of steel in seawater.

    Thanks for the reply I will take a look
  12. SteveyB

    Corrosion rate of steel in seawater.

    I have been searching through various standards with regards to determining a corrosion rate for steel in water. I basically have a component which is connected to the bottom of a turret on a FPSO made from ASTM A182 f22 (approx 30m below the surface at 30 deg C). The component has an epoxy...
  13. SteveyB

    Flange CP Insulation

    Hi I have a problem where by I have too catholically insulate a large diameter ASME flange from the rest of a subsea structure. The flange in question is being used purely in a structural capacity (no fluid pressure) with high bending moments being exerted through it and it's bolted array. Now I...
  14. SteveyB

    Pressure Test of Super Duplex Tube

    My problem is I am not sure what kind of weld preparation/pressure cap should be used in this situation with such thin pipe. Is it actually possible to full pen weld a 1.65mm tube for that kind of pressure rating?
  15. SteveyB

    Pressure Test of Super Duplex Tube

    Thanks these do look like a pretty nifty piece of kit but I fear rhey would be too expensive and are also not rated at the required pressure. I was thinking more along the lines of a weld on/threaded fitting.
  16. SteveyB

    Pressure Test of Super Duplex Tube

    Hi I have a small problem where I have to test some Super Duplex tube as part of a pressure tested assembly to a pressure of 15000psi. I also have two tube sizes to contend with which are 25.4mm NB and a 12.7mm NB with 3mm and 1.65mm wall thickness respectively. The problem I have is that I...
  17. SteveyB

    Flange Strength Calculation

    How do you go about performing a yield line analysis? I would hopefully like to try and validate some of theses suggestions against FEA and see how they compare. Thanks for the responses guys the information is great.
  18. SteveyB

    Flange Strength Calculation

    The components will be mounted flange to flange and bolted. I realise the strength of the flanges will increase from the combined stiffness of the bolt and adjacent flange, but generally I have no control over the mating flange. The current method we use is FEA to check the flange strength as...
  19. SteveyB

    Flange Strength Calculation

    Again thanks for the responses. The moment will be applied via a bolted array. So the moment should create a similar loading as mentioned by BAretired. I am basically trying to find a method of sizing the flange. Does anybody know how to go about calculating this scenario.
  20. SteveyB

    Flange Strength Calculation

    Thank you for your responses. I think I understand what you are saying but I wonder if you could clarify by using the dimensions shown in the attached image as an example. The flange will ultimately be bolted at some radial distance in. Thanks...

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