New Technical Approach to Classification of Anchor Handling
and Diving Support Vessels
A. DEVADAS RINA MUMBAI
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The offshore sector expansion in the last years is linked to:
• world increasing demand of petroleum and natural gas
• deep waters exploitations > increasing of drilling and production and storage units demand
OIL & GAS sector trend* Clarkson research Service (Mar-13)
General Market Overview
* Clarkson research Service (Mar-13)
AHTS and MPV Orderbook trend
Contracts by typeNumber of Contracts Contracting trends
2006 2007 2008 2009 2010 2011 2012 2013
AHTS >12000 bhp 20 17 19 41 46 20 20 7 UP BY… 40%
AHTS 8-12000 bhp 10 17 28 39 33 26 24 4 DOWN BY… -33%
AHTS <8000 bhp 56 68 93 149 123 112 69 6 DOWN BY… -65%
AHT 25 32 35 57 54 36 12 1 DOWN BY… -67%
Anchor Handling
Increase of depth where the O&G industry is moving to
Increase of anchoring system weight and more critical operative conditions
The AHTS stability become a parameter to keep strictly monitored
Harsher environmental conditions
Technical Challenges
Roller strength verification Winch arrangement and controlVisibility from bridge deck Hull connections verification
“Anchor Handling” is specifically designed for support to off-shore and wind farm units: roller strength, winch arrangement and control, hull connections visibility from bridge deck
Anchor Handling
RINA Approach
Additional notation showing the capability of tugs and supply vessels to handle anchors safely. Main characteristics:
specific stability criteria for compliance with Norwegian Maritime Authority
Circular – Series V RSV 04-2008 based on extensive studies carried out
by RINA on the effects of the forces transmitted by the anchor handling wire rope
this additional class notation covers also the equipment to be fitted on board, to allow the Master greater control of the ship stability
Anchor Handling STAB
RINA Approach
* Clarkson research Service (Mar-13)
MPV Orderbook trend
Contracts by typeNumber of Contracts Contracting trends
2006 2007 2008 2009 2010 2011 2012 2013
Construction Vessel 89 96 69 80 43 46 24
Lift Boats/Installation 16 15 19 12 18 8 12 1 DOWN BY… -67%
Accommodation Units 11 27 36 5 14 9 14 2 DOWN BY… -43%
MSV/DSV/Rov Support 59 61 33 2 20 37 31 11 UP BY… 42%
Offshore Dredgers 3 8 12 6 15 1
Technical Challenges
This situation generate an high complexity of the system and relative certification scheme
DIVING SUPPORT VESSELS
Maintaining position during diving operations
Stability during handling of diving equipment
Hull structural arrangements related to the diving system
Monitoring and electrical system to support the diving operations
2 type of system, Surface (up to 50 m) and Saturation (from 50 to 500m) have different characteristics which have to be dealt with in different ways:
Diving Support Vessels
The additional class notation DIVINGSUPPORT is assigned to ships equipped with a diving system certified by RINA. maintaining position during diving operations stability during handling of diving equipment hull structural arrangements related to the diving system electrical system to support the diving operations
RINA Approach
A new concept of classification is being developed on the basis of the requests of the Makers, Contractors and Associations (e.g. IMCA) of this sector1. ensure the highest flexibility in the construction, exchange,
replacements of the diving system components 2. keep the history of use and maintenance of each
component3. avoid that ‘unknown’ components are installed in the diving
systemsThree levels of Class certificates
A component based certification approach
main components can be combined in various arrangements, in order to constitute a primary system (Diving System)
the system can then be dismantled and re-combined, substituting or adding some components, for other campaigns
the three levels of certificates will grant the possibility to exchange/replace components (main or basic) on a primary system without affecting its Class Certificate.
RINA Approach
each component (principal, main and basic) is provided with a proper certificate of Class, which follows the component during its life, including the lay up periods
this system guarantees the execution of the necessary periodical surveys, defined by the Manufacturer and approved by Class
RINA Approach
RINA Rules for OSV
Stand alone classification rules for OSV
Expected issue date: July 2013Portfolio of dedicated additional
Class Notations and services to increase the Class value
Full information support through Leonardo INFO and EASY
RINA Aproach
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