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  1. Mark62

    Plotting data with equal scales

    Is it possible to force Excel to plot graphs with the same scale in both X and Y axis. In my case i am plotting the result af a catenary equation and both the X and Y axis represent linear distance. i would like to plot a true representation of this so that one metre is equally scaled for both...
  2. Mark62

    flexible risers

    If you want to see what has previously been published a good place to check would be OTC publications www.otcnet.org I know work has been done on all the aspects you are talking about. Exactly how much is published I do not know. Try contacting Wellstream, they may be interested in sponsoring...
  3. Mark62

    Pipeline in moving contact over another pipeline

    Best to avoid this type of situation if at all possible. Is there no other emergency abandonment procedure that could be adopted. My initial aproach would be to used Orcaflex, or Flexcom 3D, which are both dynamic analysis programs and can both model pipeline laying and clashing between...
  4. Mark62

    Compact Flange Details

    Try going to this site http://www.vectorint.com/mainSections/Section02_SPO/2_spo.asp You will have to register to get full details, but this is free.
  5. Mark62

    Searching for particular internet site

    This is a site that I have found very good. Once you have completed your details it will forward to you all the jobs that it thinks suits you, as and when they come up. http://www.oilandgasjobsearch.com/oil_and_gas_career.htm
  6. Mark62

    API 5L pipe line Sizing

    What is a typical allowable water velocity used for sizing a rigid flowline (API 5L Line pipe)? The flowline is to be used for water injection, the fluid is process water, which should have been cleaned of most of the nasties. Second question, I have a typical absolute roughness of 0.15mm for...
  7. Mark62

    Line Pipe Allowable velocity

    What is a typical allowable water velocity used for sizing a rigid flowline (API 5L Line pipe)? The flowline is to be used for water injection, the fluid is process water, which should have been cleaned of most of the nasties. Second question, I have a typical absolute roughness of 0.15mm for...
  8. Mark62

    Urgent Help Need for a Deep Water Suction Hose

    You need to look at the configuration of the pipe. As I understand it you have a flexible rubber hose from a floating vessel to the seabed. The hose is used for suction, probably a form of dredging application sucking sand or silt from a sea or river bed into a hopper type vessel for removal...
  9. Mark62

    Subsea Bolts

    Typical bolting used for the making up of subsea flanges are "stud bolts according to ASTM A 193 high temp type B7" often with a PTFE coating. The flange will be corrosion protected generally by anodes on the structure to which is connect or you can add anodes to the metal work...
  10. Mark62

    Spiral wound strengthening for composite pipeline

    If you leave gaps between your reinforcing tapes, you will find that the tube will simply burst between the tapes. You have to look at the ability of the tube material to be able to support the pressure across this gap. If you are to reinforce the tube I would recommend that the tube is fully...
  11. Mark62

    Pipeline Roughness

    It is to a degree dependent on pipe material and productin methods. For steel line pipe I use an absolute roughness of 0.15mm, for plastic pipe I use a value of 0.0015mm and for flexible pipe with an internal carcass a value of ID(mm)/250
  12. Mark62

    characterization of crosslink PE

    If you wish to quatify the level of cross linking then you need to perform a gel contnet test. This basically involves boiling a sample of the polymer in xylene and see what percentage of the material remains undissolved
  13. Mark62

    Vibration in pipelines

    I'm sorry that is not one I've come accross before. The one that I have seen simplifies down to being a relationship between the geometry of the pipe (height of undulations, pitch length of undulations and bore) and the velocity. As I said this is particularly for corugated pipe, which I do not...
  14. Mark62

    Vibration in pipelines

    This is a complex issue, I've recently been involoved with this problem with a flexible pipe, which has a corrugated steel lining, that was conveying gas. After a certain velocity the pipe begins to hum, as the gas flow boundary layer become unstable. This is not a problem for the flexible pipe...
  15. Mark62

    exporting gas from a platform.

    Another issue is that if the gas is to be exported through a flexible pipe line then dry gas can be transported at higher temperatures than wet gas. this is due to the fact that most offshore flexible lines have a PA11 barrier which suffers from hydrolosis problems (goes hard and brittle) at...
  16. Mark62

    two phase pressure drop

    I would recomend using PipeSim 2000. This is a good program that can handle multiphase flow and allows you to set up complex systems easily. This though is probably q relatively expensive program to buy if you are just looking for a one off calculation. They might well offer a trial version or...
  17. Mark62

    material properties of Kevlar

    In DuPonts Folder Titled "Kevlar in Mechanical rubber Goods, Technical Database" it list the thermal conductivity of Kevlar as 0.04 Joule/(sec.cm^2.K.cm)this compares with 0.23 and 0.15 quoted for Nylon and Polyester, respectively. It also gives the general comment that "the...

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