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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...

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...

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...

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...

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...

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...

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...

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...

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.

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...

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.

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...

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...

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...

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...

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...

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...

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...

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...

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...