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I've modelled a section of pipe as a 3d solid extrusion. It is a 20m long section and hence I want to vary the mesh density along the length of the pipe (z axis). I've tried partitioning the pipe section using datum planes (x-y) at various points along the length as well as a partition along the...

It sounds like you are after a piping textbook as opposed to pipelines. There are several places that run courses on this, it might be worthwhile looking into that as opposed to working your way through a textbook? I know Stratchclyde uni have run short courses on piping and piping stress, and...

Can anyone provide me any guidance on using an ASTM A694 F52 forging in a design to ASME VIII. I can find to mention of ASTM A694 in ASME II (materials). Thanks

Thanks Big Inch, so given a set of metocean data is it down to engineering judgement as to what period you would use. For example, when considering pipeline/spoolpiece stability and given the maximum wave and a range of periods? It is my experience that the maximum wave be used in conjunction...

When analyzing pipeline stability using morisons equations, the stability generally decreases as the wave period is increased. Is this due to to a longer period carrying a larger volume of water and hence generating a larger force on the pipeline? As I would assume that a lower period would also...

Thanks Big Inch, I was looking for a way to calculate the forces away from supports. Say I have piping routed between two supports, anchored at one and guided at the other. How can I calculate the effective force due to pressure and temperature mid way along the piping (between the supports)?

The majority of my experience is related to subsea pipelines so excuse me if this question is obvious. Now for a pipeline if I want to consider the effective force I generally have two options, the fully restrained force (made up of end cap, thermal and poisson effect forces) or if I am looking...

Thank you, I just thought there may be a minimum required due to the maths involved, I was advised that for linear elements a minimum of 6 is required?

Could someone direct me to some literature that will describe how to determine the minimum number of elements that should be used through a wall thickness for different element types? Thanks

No bending at all? What about in subsea piplines/spoolpieces? Wouldnt a WN-WN make up prove a great deal harder for divers?

I am aware that an API 17D 17SV swivel ring flange will generally have a lower bending moment capacity than the equivqalent API 6A 6BX (or API 17D 17SS) weldneck flange. In the past I have used API 6AF for a guidance on the capacity of a flange, however since this is only applicable for...

I was told today that when trying to provide cathodic protection to a riser within a j-tube it cannot be done with sacrifical anodes. Can anyone confirm this and give me some background as to why? I was told in a 'matter of fact' way and when I enquired further I wasnt given much of an...

Thanks Beh

it depends where your pipeline is? onshore/offshore etc? part 2 deals with subsea pipelines and the test is 24hours

B31.3 even.

Thanks, is this taken from B31.1?

Would I do a check against the yield strength for hydrotest as opposed to the basic allowable stress?

I've been asked to confirm the wall thickness of some inconel high pressure tubing to b31.3. This is high pressure tubing, design pressure 600 bar. This results in a test pressure of 900 bar. The selected wall thickness is acceptable as per section 304, and specifically equation 3a. This is...

theres some good info in this thread: http://www.eng-tips.com/viewthread.cfm?qid=146756&page=1 good luck with interview

there will be CP provided, however it sounds like i'll be better going with something else. is there a reference for the galvanic compatibility issues? i read in ISO 10423 that A453 Gr 660 fasteners are good for use across the board for subsea use. thanks