Trans RINA, Vol 153, Part A1, Intl J Maritime Eng, Jan-Mar 2011
dynamic positioning system (DP3), and 5 Voith Schneider propulsion systems.
submersible flotel, but limited to benign and shallow waters, such as the Gulf of Mexico or West Africa. AWBs have traditionally been used wherever there is a need
for additional accommodation, engineering, construction or storage capacity offshore.
AWBs can be positioned alongside installations, or in central locations where they act as field operation centres for maintenance of groups of platforms and structures.
As opposed to barges for coastal and inland waters (see the section on coastels), an offshore mono-hull barge must be:
Figure 11: M/V Edda Accommodation
Technical features: Length: Beam: Draft: Speed:
Capacity: Class:
Note: Cost:
5. 5.1
130 m 27 m 7.0 m 12 kn
600 beds in total in 1, 2 & 4 bed cabins. A total of 177 cabins
DNV 1A1, SUPPLY VESSEL, SF, EO, ICE C, DYNPOSAUTRO, CLEAN DESIGN, COMF-V(3), COMF-C(3),NAUT AW
it has not the SPS Class Notation, but complies with the SPS IMO Code US$140 million
MONOHULL ACCOMMODATION WORK BARGES
INTRODUCTION
As per the definition of Det Norske Veritas (DNV), “Barges and pontoons are defined as vessels without sufficient means of self propulsion for their service area. Assistance from another vessel during transit or transportation service is assumed. Guidance note: In vessels with limited means of self propulsion an upper limit for barges/pontoons may normally be taken as machinery output giving a maximum speed less than V = 3 + L/50 knots, L not to be taken greater than 200 m.” So barges could be self propelled but at very low speed. That means that even with thrusters for dynamic positioning a barge is still considered a barge and not a ship. When in service, they are normally moored or anchored to the bottom if not equipped with a DP system. They can be of the mono-hull
type, of the
semisubmersible type, or even of the jack-up type, but the term “barge” normally refers only to the mono-hull type.
Mono-hull Accommodation Work Barges (AWB), have been supporting the offshore oil and gas industry from the very beginning, even
before the A-48 first semi- ©2011: The Royal Institution of Naval Architects
Long enough to have minimal pitch and surge response to the waves in which it normally works → typical offshore barges run from 80 to 160 m in length.
Wide enough in beam to have minimum roll → width should be 1/3 to 1/5 of the length.
Deep enough to have adequate bending strength against hog, sag, and torsion, as well as adequate freeboard → Depth will typically run from 1/15 of the length. Inland barges, subjected to minimal wave loading and required for operations in shallow water may have depths as low as 1/20 of the length.
Such ratios have been found to give a reasonably balanced structural performance under wave loading. In fact, the classification under which they are built is totally different. While coastel barges are classified as Hotel Barge –RE Pontoon, there is a dedicated notation for the offshore barges in most of the class societies: Accommodation Work Barge.
The following paragraphs give one example of each type of AWB: non-propelled and self-propelled.
5.2 NON-PROPELLED MONO-HULL BARGES
This is the most common type of Accommodation Work Barge, but is limited to operations in relatively shallow waters as it should be moored or anchored to the bottom. Although current mooring
technology
makes it possible to reach deep waters of up to 1,700 m, dynamic positioning is more effective at such depths. In practice, these moored barges are used in shallow waters of up to 300 m in depth.
5.2 (a) Lancelot
This is a typical Accommodation Work Barge owned by Intership Limited. It was built in 2009, with an 8 Point Mooring system and
accommodation facilities for offshore workers and also has lifting capacity of 25 ton.
provides all the
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