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It does sound like MIC, '6 o'clock grooving'. You mention produced water - could it be something to do with an increase in sulphate reducing bacteria in the produced water in later field life? Was the spool 100% like for like?

What type of flexible pipe are you referring to? Bonded or unbonded? If unbonded then check out API 17J.

So is it in service now? If so you'd probably want to flush it with meg water mix or similar to remove hydrocarbons and then leave it filled with treated water (corrosion inhibtor, oxygen scavanger etc) as noted above. You may want a specific cleanliness (i.e. oil in water ppm) which would...

Nitrogen and gel pigs?

Thanks Steve

Thanks LittleInch, yeah from what i've read so far the existing development has not used methanol - but has spare cores in the umbilical so I think we'd need the ability to inject at least some of the time for the reasons you stated. Thanks again

Thanks, much appreciated.

ROTs? Its approx 12km, 15yr design life. Just at feasibility stage so nothing too detailed has been done yet - I'm reviewing well test data and running some economics. That NiDI CRA Materials Selection document is very useful, thanks. There was an 12 ion analysis done of water samples and it...

Thanks for the replies. Looking at 6" to 10" pipeline. No corrosion modelling done yet, but OPEX concerns and its a subsea tie-back to subsea manifold, no CI injection currently. Reservoir pressure approx 5K. I'll review info for salinity.

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...

Yeah good point that is very deep for recovering after a laydown, maybe they can use a diverless connector or something and make up the connections on the seabed with ROV.

Yeah that's what I said, multiple lengths can be joined together? You're going to be limited by the number of reels on the vessel though so would likely have to lay down, transit to collect next length(s) and then recover and connect the end fittings and continue lay.

the length would be limited by the size of vessel installing it - or the size of the reel/carousel. Multiple lengths can be joined together though.

Thanks, will do.

Thanks Steve, it is treated seawater but as you say if there are issues with any of the oxygen removal etc on topsides this could cause problems - my concern is we then introduce a 'weak' section in our system given we've gone for CRA materials elsewhere. However the 3rd party system is carbon...

Thanks for replying. It is a WI pipeline and we have selected CRA materials. It is a 3rd party manifold and they have advised that the carbon steel pipework has been inspected and they have no integrity concerns. Would there be a significant corrosion risk from tying a super duplex flange into...

Thanks for the reply. That sounds about right, there's not much in the way of design documentation to confirm. Sorry I meant the old pipeline system not new, and the old pipeline and spools had ring groove inlaid flanges, its just the manifold pipework that doesn't. I was planning to use...

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)...

Ah - yeah that's sorted it. Thanks again folks

Thanks again. I got it to work with the vectorize function, but didn't have any luck using an index. I defined i using the rows function but then when I defined Reynolds number using subscript i on the velocity, viscosity and density variables it resulted in an error message saying that all the...