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  1. EricFrance

    From Workbench to Mechanical APDL

    hi I try to transfer a deformed geometry from "linear buckling" to Mechanical APDL. I created the file.inp, and modified the script by : /prep7 upgeom, 1 ,1,1,file,rst cdwrite,db,file,cdb When i do command "update" in mechanical apdl, the update failed and i have a error message : The solver...
  2. EricFrance

    Pipeline external pressure

    Hi, The formula is the following : P=(Roxgxh)+Pa with : Ro=density of sea water g=gravity H=depth Pa=Athmospheric pressure. Exemple : At 300m of depth, the water density is about 1026kg/m3, also the external pressure is : P=((1026*9.81*300)/100000)+1 P=31.195 bar, with P=relative pressure...
  3. EricFrance

    Which Aluminum is best?

    vctech, What is the overall diameter of hull and the lenght? Does the hull is protected by coating or not? In fact, the aluminium alloy 5086 (or 5083), alone, is the better for marine corrosion resistant. Also, the 5754 may be used. Other aluminium alloy my be used; for example, 6082 T6 (with...
  4. EricFrance

    Metal to Metal Contact Behaviour

    At a great depht : a. Stainless Steel to Aluminum (subsea) : if the aluminium is not protected, there is a risk of galvanic corrosion. b. Stainless Steel to Stainless Steel (subsea) : if stainless steel have the same characteristics (for exemple two "316L") there is no problem (Not prolonged...
  5. EricFrance

    Vessel Accelerations on Offshore Structures

    Bonjour, Firstly, you must define your "Safe working Load (SWL)"; For example, if maximum load lifted is equal to 50 kg, Swl = 50kg. Secondly, you must calculated Dynamic Amplification Factor (DAF). Effectively, ABS give, for Launched and recovery system, a DAF = 1.75g. Other rules allow to...
  6. EricFrance

    reliable AUVs

    You will find explanations on the site of ECA : ECA designed and realized autonomous underwater vehicles as ALISTER. EricFrance
  7. EricFrance

    Slipway pull

    Ok. If the vessel is pulled on the slipway, then : Slope = Atan (1/14) = 4.08° Rolling factor = 0.1 P=100T = 100000DAN F = (100000*cos4.08*0.1)+(100000*sin4.08) F=17090DAN = 18Tons = minimal winch capacity. I hope this result will help you. EricFrance
  8. EricFrance

    Marine Operations ( Anchor Handling) References

    See the Rules : For exemples, DNV Marine operation or guideline for lifting operations of Noble Denton. EricFrance
  9. EricFrance

    Max clearance to not allow marine growth

    See DNV Cathodic protection.
  10. EricFrance

    Lloyds Code for Lifting Appliances in a Marine Environment

    Hi argentox. I look for the chap 3 "Cranes and submersible appliances". What are the dynamic factors give by this code for calculated a lifting appliance or a LARS? Thanks for responses. EricFrance.
  11. EricFrance

    Corrosion Allowance in Splash Zone

    See DNV RP B401 Cathodic Protection Design, Or DNV RP F103 Cathodic protecton of pipeline, section 8. normally you find that value. Eric
  12. EricFrance

    lifting appliance for submarine vehicle

    Thank you for your response. I continuing my study for design the A-Frame. I seen the codes : ABS, DNV, and PR EN 13852. Effectively, This is not obvious to use. I confirm the DAF=2 for sea state = 3 when i use the code PR EN 13852 (offshore crane). The horizontal and lateral forces are not...
  13. EricFrance

    lifting appliance for submarine vehicle

    Ussuri, I have two codes : - [1]Pr En 13852 Offshore Cranes, - [2] DNV Certification of lifting Appliances. I am agree with you for DAF >=1.3 (Offshore Crane, load lifted and moved on the shipboard, DNV page 25, B304). But I need calculate the DAF when the vehicle is picked (vehicle filled of...
  14. EricFrance

    lifting appliance for submarine vehicle

    Hello, I am a french engeneer, I must design a "gantry swivel" for submarine vehicle. I want to calculate the "DAF" using a standard. The load is 35 kN. the customer asks for a sea state 3. I saw IN DNV the following equation : DAF = 1 + Vr (C / W.g)e0.5. with Stiffness factor = 2333 kN/m what...

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