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  • Users: SteveyB
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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. SteveyB

    Flange Strength Calculation

    Hello, I wonder if anyone can give me some help. I am trying to determine the strength of a flange which is subject to an external bending moment. The flange is rigidly supported at the necked portion and has a bending moment applied at the flange face. In essence it is similar to a pipe flange...
  9. SteveyB

    Welding Literature

    I was wondering if anyone could recommend any reference material with regards to specifying standards to work to as well as defining inspection and weld categories on drawings. This is something I would really like to gain a better understanding of.
  10. SteveyB

    25Cr Galling Threshold Stress

    Hi, I was wondering if anyone could advise on the galling resistance of 25cr (UNS S32760)on 25Cr. I have has a good search on the Internet and Iam struggling to find any info on its resistance to galling in machine cut threaded components. Please forgive me but I have posted this else where in...
  11. SteveyB

    25Cr Galling Threshold Stress

    Hi, I was wondering if anyone could advise on the galling resistance of 25cr (UNS S32760) on 25Cr. I have has a good search on the Internet and Iam struggling to find any info on its resistance to galling in machine cut threaded components.
  12. SteveyB

    Duplex Threaded Components

    Hi, I was wondering if someone could advise. Basically I have two super duplex (UNS S32760) components that are required to be threaded together with a M40x1.5 thread, torqued to 750Nm. Hence I was wondering how susceptible the threads will be to galling issues, as there seems to be little or...
  13. SteveyB

    DNP Subsea Coating

    Hi, I have a question with regards to the general use and application of diffused nickel coatings (DNP) for primary corrosion protection subsea. I know some major operators such as Petrobras advocate the use of DNP, but my question is why does this not seem to be the case for other operators...
  14. SteveyB

    ASME Welding NDE Inspection

    Hi, I was wondering if someone could help/advise with relation to the ASME IX standard. Basically I have to work to ASME IX for a particular job in which a small protective frame needs to be produced. The difficulty I am having, is specifying what the inspection/quality level requirements are...
  15. SteveyB

    Stainless Bolting

    Hi I was wondering if anyone could give some advice on what is the best stainless bolting material for long term subsea use in a CP environment. Basically I am required to bolt to a M20 female threaded component made from 431S29 (UNS S43100). I was thinking of using the same material but was...
  16. SteveyB

    Coating of steel in a CP ennironment

    Hi All, I was wondering what the opinion was on subsea coatings for structural steel e.g S275/S355. The company I work for has used many different coating such as, thermally sprayed aluminium, epoxy coatings, diffused nickel plate. The thing is most of these are not suitable for mechanical...
  17. SteveyB

    Duplex crevice corrosion

    Hi All, I was wondering if anyone could give some advice on a potential component issue I have which is made from UNS S32760. Basically I have a component that will be part of a subsea manifold consisting of several intricate parts and contains multiple small gaps and sealing faces. The...
  18. SteveyB

    EPDM Material Data

    Hi All, I was wondering if someone could help me with my dilema. I am after some material data for a 70 shore hardness EPDM rubber,to run a 3d analysis of a seal in ansys workbench. I realise that many factors effect the input data but I am just trying too obtain a rough estimate of the seals...
  19. SteveyB

    EPDM Material Data

    Hi All, I was wondering if anyone could help. Basically I am after some material data of EPDM rubber (70 shore) to enter into a FEA model of a seal in Ansys. The analysis is a 3d analysis and therefore requires bi-axial and uni-axial stress strain data. I was wondering if anyone had access or...
  20. SteveyB

    EPDM Material data for ansys workbench 13

    Hi All, I was wondering if someone could help me with my dilema. I am after some material data for a 70 shore hardness EPDM rubber,to run a 3d analysis of a seal in ansys workbench. I realise that many factors effect the input data but I am just trying too obtain a rough estimate of the seals...

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