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3-DNV-marine-operations-rules.pdf

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    DNV Marine Operations Rulesfor Subsea Lifting

    New Simplified Method for Prediction of Hydrodynamic Forces

    Tormod BeDNV Marine Operations

    2nd December 2008

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    DNV Marine Operations' Rules for Subsea Lifting Slide 22 December 2008

    Content

    Brief overview of relevant DNV publications

    DNV Rules for Marine Operations, 1996,Pt.2 Ch.5 Lifting Capacity Checks

    New Simplified Method for calculation of

    hydrodynamic forces

    CFD Analyses Test Cases

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    DNV Marine Operations' Rules for Subsea Lifting Slide 32 December 2008

    Relevant DNV Publications

    Lifting- and subsea operations :

    DNV-OS-E402

    Offshore Standard for Diving

    Systems January 2004(Amendments October 2008)

    DNV Rules for Planning and Execution of

    Marine Operations 1996

    Special planned, non-routine operations of

    limited durations, at sea. Marine operations arenormally related to temporary phases as e.g.

    load transfer, transportation and installation.

    DNV Standard for Certification

    No.2.22 Lifting AppliancesOctober 2008

    DNV Standard for Certification

    No. 2.7-1 Offshore ContainersApril 2006

    Special planned non-routine operations Routine operations

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    Relevant DNV Publications - Other

    DNV-RP-C205 Environmental Conditions

    and Environmental LoadsApril 2007(replacing Classification Notes No 30.5)

    DNV-RP-H101 Risk Management in Marine

    and Subsea Operations, January 2003

    DNV-RP-H102 Marine Operations duringRemoval of Offshore Installations, April

    2004

    Standard for Certification No. 2.7-3

    Portable Offshore Units, June 2006(a new revision is planned which will include subseaunits)

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    DNV Marine Operations' Rules for Subsea Lifting Slide 52 December 2008

    Relevant DNV Publications - Purchase

    DNV publications can be purchased at:

    http://webshop.dnv.com/global/

    The new DNV-RP-H103 (December draft version) will bemade available together with the presentation materialfrom this Subsea Lifting Operations seminar.

    DNV accept use of the December draft version untilthe official release is issued in April 2009.

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    DNV Marine Operations' Rules for Subsea Lifting Slide 62 December 2008

    Content

    Brief overview of relevant DNV

    publications

    DNV Rules for Marine Operations, 1996,

    Lifting Capacity Checks

    New Simplified Method for calculation of

    hydrodynamic forces

    CFD Analyses Test Cases

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    DNV Marine Operations' Rules for Subsea Lifting Slide 72 December 2008

    Capacity Checks - DNV 1996 Rules

    Rules for Planning and Execution of Marine Operations, 1996

    Part 1 - General

    Pt.1 Ch.1 - Warranty Surveys

    Pt.1 Ch.2 - Planning of

    Operations

    Pt.1 Ch.3 - Design Loads

    Pt.1 Ch.4 - Structural Design

    Part 2 - Operation Specif ic Requirements

    Pt.2 Ch.1 - Load Transfer Operations

    Pt.2 Ch.2 - Towing

    Pt.2 Ch.3 - Special Sea Transports

    Pt.2 Ch.4 - Offshore Installation

    Pt.2 Ch.5 - Lifting

    Pt.2 Ch.6 - Sub Sea Operations

    Pt.2 Ch.7 - Transit and Positioning

    of Mobile Offshore Units

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    DNV Marine Operations' Rules for Subsea Lifting Slide 82 December 2008

    Capacity Checks - DNV 1996 Rules

    Part 2 Chapter 5

    Dynamic loads, lift in air

    Crane capacity

    Rigging capacity,(slings, shackles, etc.)

    Structural steel capacity(lifted object, lifting points,spreader bars, etc.)

    Part 2 Chapter 6

    Dynamic loads, subsea lifts

    (capacity checks as in Chapter 5 applying dynamic loads from Chapter 6)

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    DNV Marine Operations' Rules for Subsea Lifting Slide 92 December 2008

    Capacity Checks DAF for Lift in Air

    Dynamic loads are accounted for by

    using a DynamicAmplification Factor

    (DAF).

    DAF in air may be caused by e.g.

    variation in hoisting speeds or motions

    of crane vessel and lifted object.

    The given table is applicable foroffshore lift in air in minor sea states,

    typically Hs < 2-2.5m.

    DAF must be estimated separately for

    lifts in air at higher seastates and for

    subsea lifts !

    Table 2.1 Pt.2 Ch.5 Sec.2.2.4.4

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    DNV Marine Operations' Rules for Subsea Lifting Slide 102 December 2008

    Capacity Checks - Crane Capacity

    The dynamic hook load, DHL, isgiven by:

    DHL = DAF*(W+Wrig) + F(SPL)

    ref. Pt.2 Ch.5 Sec.2.4.2.1

    W is the weight of the structure,including a weight inaccuracy factor

    The DHL should be checked againstavailable crane capacity

    The crane capacity decrease whenthe lifting radius increase.

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    DNV Marine Operations' Rules for Subsea Lifting Slide 112 December 2008

    Capacity Checks - Sling Loads

    The maximum dynamic sling load, Fsling,can be calculated by:

    Fsling= DHLSKLkCoGDW/ sin

    ref. Pt.2 Ch.5 Sec.2.4.2.3-6

    where:

    SKL = Skew load factor extra loadingcaused by equipment and fabrication tolerances.

    kCoG = CoG factor inaccuracies in estimated

    position of centre of gravity.

    DW= vertical weight distribution e.g.DWA = (8/15)(7/13) in sling A.

    = sling angle from the horizontal plane.

    Example :

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    DNV Marine Operations' Rules for Subsea Lifting Slide 122 December 2008

    Capacity Checks - Slings and Shackles

    The sling capacity Minimum breaking load,MBL, is checked by:

    The safety factor is minimum sf3.0.

    (Pt.2 Ch.5 Sec.3.1.2)

    sf

    slingsling

    MBL

    F


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