This website uses non-intrusive cookies to improve your user experience. You can visit our cookie privacy page for more information.

2008 pipeline seminar - NKT audio Q&A

12.20-12.45 - Advances in Fibre Optic Condition Monitoring of Flexible Pipes - NKT

‘Open Forum - Question and Answers’ session at the end of the presentation by Nick Weppenaar of NKT Flexibles

Download (right click and select 'save target as...')
NKT Q&A audio [4m59s - MP3 4.57MB]
Listen online
You need flash player installed to listen to this audio clip online. Alternatively use the download link above.


Paddy O’Brien – MCS. Now your own presentation and two previous presentations talked about fibre optics and use of fibre optics and flexible pipe so obviously that’s something that you’ve been looking at over a number of years. Do you think the industry is about to you know take this up. Do you think projects are going to actually implement this in their projects or what’s your perception of that and perhaps maybe you know what’s the cost of doing it cos probably that’s part of the thing as well?

Nick Weppenaar - NKT Flexibles (Presenter). We’re suddenly seeing a highly increased level of interest over time. The timeline for our participation that we made a pipe - the first pipe with fibre optic strain monitoring in ’99 and presented this in 2001 at OTC. Then in 2005 we sold the first pipe. In 2007 we sold the next and 2008 we sold two more and have had interest from several more and a lot of clients are suddenly coming to us and asking about it because they’re starting to see the reason, so I think it’s definitely moving towards this more and more. Also as it’s becoming standardised, robust and easier to implement. Was there a second part of the question?

Paddy O’Brien – MCS. Yeah the cost.

Nick Weppenaar - NKT Flexibles (Presenter). Yeah the strain monitoring system is the most expensive simply because it takes a lot of extra man hours and work to get it into this pipe structure and at a rough estimate I’d say half a million dollars for such a system. The more pipes you have the cheaper it actually becomes because it’s easier to integrate into our production. Temperature sensing - about a quarter of a million dollars but the cost is the hardware and the optics for most part. So basically the cost is more or less the same if you have one pipe or four pipes on the same platform because one unit can service four pipes for this system, so you get advantages from high volumes. Gas sensing - we’re not quite sure yet of course because we’re still at the lab stage but we’re guessing a quarter of a million dollars or cheaper. That’s our expectation.

Yeah Ian Wright from DNV. The temperature sensing is on the full length and the PS system is gas sensing also on line. Can you create a location effectively?

Nick Weppenaar - NKT Flexibles (Presenter). Well basically there’s no technical problem with putting gas in further down but it will have to fit in this box somewhere. So we’re basically best to do it somewhere where we had an existing structure like two end fittings meeting or a specialised structure we had to put in simply because there isn’t any space in a normal continuous pipe structure. There’s no problem with leading the fibre optics and the unit down but we need to make a space for it in the pipe but it could also be in the furthest end fitting for example?

Hi Lenny Sutherland - Schlumberger. I think you said your fibre was coated in Peak?

Nick Weppenaar - NKT Flexibles (Presenter). Yes.

Lenny Sutherland - Schlumberger. Now hydrogen darkening is obviously an issue with the optical sensing. How do you deal with that?

Nick Weppenaar - NKT Flexibles (Presenter). Well basically we’ve run a test where we had 10% H2S in a CO2 concentration for 3 months and we didn’t see any effect at all on the signal.

Lenny Sutherland - Schlumberger. Yeah but the hydrogen darkening tends to be an over time issue, say, a year, two years? And this is a twenty year design life?

Nick Weppenaar - NKT Flexibles (Presenter). Yes it is. No we haven’t tested it explicitly but we are looking at a full qualification programme which will give us some sort of standard solution and that will definitely be part of this. We have discussed it but we haven’t implemented it yet as a test.

Hi, Dave Charlesworth - BP. With regard to your strain sensoring and the model calibration that maybe goes along with that, how much access have you had to other relevant data such as vessel response, metation conditions etc on dynamic risers if that’s where you’ve got them installed?

Nick Weppenaar - NKT Flexibles (Presenter). Well what we’ve mostly looked at so far is getting the system to work and measuring accurately but I can mention that the first full scale test which we did in ‘99 to 2001 was actually used to calibrate the BFLEX programme so it has been held up against a full scale test but not so much yet against real operating conditions.

Nacera Le-Mat-Hamata - Subsea 7. Yeah the last presenter was talking about the data analysis for fibre optic and he said that it can be very very involved. I would like to ask your opinion about this?

Nick Weppenaar - NKT Flexibles (Presenter). Yes we agree basically. We’ve mostly gone firstly from the technology viewpoint getting something that’s capable of doing the measurements we want to get and now we’re looking at having an after-sales department in our company to handle it so we’ll also be providing the integrity management services for data collection and data analysis and reporting and things like that. It will be implemented during the next year.

Updated 2012-10-05