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8/12/2019 DNV Marine Operations Rules for Subsea Lifts
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DNV Marine Operations Rulesfor Subsea Lifting
New Simplified Method for Prediction of Hydrodynamic Forces
Tormod BeDNV Marine Operations
27th November 2007
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DNV Marine Operations' Rules for Subsea Lifting Slide 227 November 2007
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 327 November 2007
Relevant DNV Publications
Lifting- and subsea operations :
DNV-OS-E402
Offshore
Standard forDiving Systems
January 2004
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 Rules for Certi ficationof Lifting Appliances 2007(reprint of 1994 issue)
DNV Standard for Certi fication
No. 2.7-1 OffshoreContainers April 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 issued in 2008 which willinclude subsea units)
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DNV Marine Operations' Rules for Subsea Lifting Slide 527 November 2007
Relevant DNV Publications - Purchase
DNV publications can be purchased at:
http://webshop.dnv.com/global/
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DNV Marine Operations' Rules for Subsea Lifting Slide 627 November 2007
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 727 November 2007
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 827 November 2007
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 927 November 2007
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 1027 November 2007
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 1127 November 2007
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 1227 November 2007
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