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Recent content by tobbe

  1. tobbe

    Vessel deck strength

    I would say that classed ratings do account for cargo accelerations, DNVGL do state that for a distributed load, the static and dynamic pressures due to this distributed load shall be considered. But the brochure's data has, as stated, to be verified. best regards Torbjörn T.
  2. tobbe

    Engineering iPad apps

    You should not settle with anything less than a FE-app on your iPad: http://www.nenastran.com/press-room/NEi-Software-Announces-Free-Mobile-FEA-Application No idea how it works since my company does not supply us with IPads ;-) T.
  3. tobbe

    Aluminum NV-5059

    Hi. I am into designing the hull of 25m 40knot aluminum vessel. Industry standard is to use NV/EN/AA 5083 for plating due to good strength and corrosion resistance. For this project we are considering to use NV-5059, branded as Corus Alustar, which have an almost 30% higher yield strength than...
  4. tobbe

    Low Temp Steel

    If you are looking for angle bars or of bulb flats Norskt Stål (www.norskstaal.no) can supply a selection of dimension in D36-quality. Bulbs: http://www.norskstaal.no/varekatalog/varekatalog.aspx?varegr=13_1# Angles: http://www.norskstaal.no/varekatalog/varekatalog.aspx?varegr=14_1# Regards T.
  5. tobbe

    Re: Asphalt Vessels

    Heated to 200 deg C it is a liguid. The type of vessel you will need is refered to as Bitumen tanker. The vessel cargo capacity is measured in DWT, i.e you need a ship with a capacity of 5.000 DWT or greater, or two smaller. Tarbit Shipping and Theodora Tankers BV are two ship owners in the same...
  6. tobbe

    Platform design companies

    Just some additional to DrillerNics post. GVA is owned by/part of KBR, and hence "a big boy" ;). T.
  7. tobbe

    system codes for vessel maintenance

    Standard and standard.. I am really not sure what you are looking for but the AMOS-maintenance system is in some organizations considered as a standard although a commercial product. http://www.spectec.net/default.asp The SFI group system was a norwiegan standard but seems only be available...
  8. tobbe

    Calculate steel weight of a vessel.

    Yes it does. Its a statistical method to get an approximate weight for estamating price in the early phase of a project when I only have intended main main dimensions of the vessel. Each type of vessel (or each yard) have different methods to estimate weight, and I am intrested in a publication...
  9. tobbe

    Calculate steel weight of a vessel.

    Could anyone please share any method, by rule of thumb, to calculate the steelweight of any ship in general, and a 50m coastguard vessel in particular, for the use in the early project phase. I.e. LxBxHx "C" = Weight or preferably somethin more exact? Thanks T.
  10. tobbe

    LINEAR TET ELEMENTS

    I would certainly use linear tets for a first-run, since my pre-processor (and virtually any other) easily converts them to parabolic, in order to save analysis time if needed. My definition of "first-run" is a test-run where I check that the model is possible to analyze and have a reasonable...
  11. tobbe

    More effective - bow thrusters or stern thrusters?

    AngelAlvarez> A twin engine configuration does not outrule the use of the stern-thruster. Large cruise-ship often are have that configuration because it improves their manouverbility?? partly due to their large superstructure creating large wind-forces. A must? Maybe not, but they make life...
  12. tobbe

    Penetration analysis

    I am often performing extensive penetration-analyses for large steel-constructions. For the moment penetrations of girder-beams. I am looking for reference-books/hand-books covering the topic (girder penetrations). Both theoretical books and books containing tabulated examples/typical cases are...
  13. tobbe

    welding steel and aluminum

    Rjeffery: Do you mean that you use the anodes to protect the superstructure, or do you mean the underwater-hull mounted anodes? Jusy curious.
  14. tobbe

    welding steel and aluminum

    The explosion welding is a well proven design often used in marine applications without corrosion problems There is corrosion, but the speed is reduced greatly and as good as zero due to protective aluminium oxide in the interface between the materials. Due the solid bonding it is not possible...
  15. tobbe

    welding steel and aluminum

    It is not possible to weld aluminium to steel without serious corrosion problems. However there are profiles with one side aluminium and one side steel which are "exploded together". Then you weld steel/steel and alu/alu. Maybe not an opion for you but a very neat way of joining...
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