I'm looking at options for an oil and gas production pipeline (feasibility stage), the produced fluids have a high CO2 content (circa 18-20 mol%) and the reservoir conditions are close to dew point, no H2S. Its safe to say carbon steel will not work as a pipeline material, is there a guide or...
I am designing a subsea pipeline system that is tying into an existing manifold. We are reusing a tie-in point (wn flange) for a decommissioned field, so the flange we are tying into has been used previously. Reviewing the original design (20yrs old) it appears that the wn flange (on manifold)...
I have entered my datasets using 'Insert Table' in mathcad prime. All variables have 12 different values (its annual data, so each variable has 12 values) which I have entered as a table with 12 rows and 1 column, and defined the units as applicable.
I am performing various calculations with...
I'm modelling a section of 12" pipeline/spools that consist of a straight section of pipe (50m) followed by a 45degree bend and a 100m straight section that ties into a structure (anchored in the model). I have applied 400mm of pipeline expansion to the straight section of spoolpiece. I am...
What is the minimum length of pipeline over which lateral buckling can occur? We have a repair to perform on a subsea pipeline that requires excavation of approximately 150m length of pipeline (trenched and buried). The pipeline will be reburied and dumped with rock but we may have scheduling...
Does anyone have any experience of installing a clamp or similar onto a leaking valve? We have a several leaking valves and there are concerns regarding integrity (obviously) and we have been advised that preferred solution is to not operate valve or access gearbox etc due to concerns of making...
What is the best way to extract loads at flanges? I have modelled all flanges as rigids with an anchor and cnode, a technique I read about on here. I want to confirm that I am interpreting the results correctly. If I have a section of pipe along the +ve X axis, say 10m length with nodes 10 to...
Is there anyway to use the list/grid as an excel spreadsheet and using copy/paste? I have hundreds of restraints within a model and want to modify the stiffness etc values- I'm thinking there has got to be a quicker way that modifying each input individually?
If I have a short pipe in pipe pipeline, say 4km long, that is surface laid (i.e. not trenched and buried) and not fully constrained/anchored and so the fully constrained effective axial force is not reached. If I wanted to plot the effective force profile for this, the maximum force is governed...
I am currently looking into the possibility of including a subsea multi-phase pump into a 4 well tie-back (15km tieback to host manifold). Downhole ESPs have already been ruled out, so the remaining options are a twin srew pump (TSP) or a helico axial pump (HAP). What would generally be the...
Aside from project specification what would govern the manufacuring technique used for a pipe fitting (ASME B16.9)? I generally work with pipelines that require pigging and as such pulled/induction bends are generally specified (3D or 5D). However, in manifolds or spools where pigging isnt...
I am trying to write a summary of options for subsea structures (manifolds etc). Obviously we can have a piled structure or a gravity based structure. Is there a design code that gives an overview of the options for dealing with fishing gear snagging? From research so far I have come across...
