1| PAGE

www.bimv.com

LOAD OUT TRAINING - DAY 3:OFFSHORE MARITIME RISK ANALYSIS

Capt. Nol Haegeman

Kuala Lumpur, June 2011

2| PAGE

www.bimv.com

3| PAGE

www.bimv.com

LOAD OUT MOVES TO LOCATION

4| PAGE

www.bimv.com

Mooring/Move procedures

Consideration of the planning mooring operations

Short move from docking to heavy weight or towed move to location

Transported & moored on heavy weight ships or under tow by tugs & AHTs

Interfield move

Coastal interfield move

Oceanic move

5| PAGE

www.bimv.com

Basic steps

Local law application as on Unclos EEZ considerations

Preparing of checklists based from barge to all assisting equipment units

Capability of barge / offshore unit for mooring in designated location

Are AHTs & mooring anchor equipment available & in good condition

Use of competent, experienced and certified labour

Time schedule planning based on meteological & geographical limiations

6| PAGE

www.bimv.com

Cont. Basic steps

With drawings provided proposed mooring-anchor pattern described & approved by authorities & experts

Anchor-mooring procedures & sequence as location approaches described &planified based on drawings

Positioning by tugs & AHTs based on DP & transponder observations

Sufficient tugs available as required bollard power based on Deadweight & prevailing weather conditions

Good communication required between all individual & combined offshore units

Approvals & permissions by oil/mineral industry departments and marine underwriters by warranty surveyors-certifications

Certificate of Approval

7| PAGE

www.bimv.com

Approval Certificate

8| PAGE

www.bimv.com

Operations planning check list

9| PAGE

www.bimv.com

Positioning procedure

10| PAGE

www.bimv.com

NOBLE DENTON

11| PAGE

www.bimv.com

Tow - Mooring gear

Considerations of strenght Arrangements for each different unit Towing bridles Tow mooring planifications Use of mooring-tow lines

12| PAGE

www.bimv.com

TOWING ARRANGEMENTS

13| PAGE

www.bimv.com

STRENGHT TOWING GEAR

14| PAGE

www.bimv.com

TYPICAL TOWING GEAR REQUIREMENTS Equipment

Minimum Breakings Strength (ST)1.3 in. Pendant Wire 6 x 37 Galv. IWRC3602.2 in. Pendant Wire 6 x 37 Galv. IWRC2723.2 in. Pendant Wire 6 x 37 Galv. IWRC(Weak Link)180-2604.3 in. 85 ton G-2130 Safety Anchor Shackle4255.2 in. 55 ton G-2130 Safety Anchor Shackle3306.3 in. G RIII Stud Link Chain552.57.Triangular Flounder or Fish Plate290

15| PAGE

www.bimv.com

STANDARD MAIN BRIDLE

16| PAGE

www.bimv.com

Towing Bridle

Fishplate

Hawser

Tugger line

17| PAGE

www.bimv.com

FISHPLATE

18| PAGE

www.bimv.com

TOWING RINGS & HARP SHACKLE

19| PAGE

www.bimv.com

Connection Details

STUD LINCK &PINS

Dont use Panama

20| PAGE

www.bimv.com

Deep draft towing gear

3/ 85 ton shackles

21| PAGE

www.bimv.com

2 Tugs towing

22| PAGE

www.bimv.com

Towing using anchor/chain

Chain out minimum 150 ft

23| PAGE

www.bimv.com

Narrow Water Towing

Short tow line

24| PAGE

www.bimv.com

LONG DISTANCE OCEAN TOW

25| PAGE

www.bimv.com

TOW GEAR INSPECTION

26| PAGE

www.bimv.com

STRENGHT OF TOWING GEAR

27| PAGE

www.bimv.com

Basic Tow Line Configuration

28| PAGE

www.bimv.com

Towing arrangements for heavy duty semi-submersible

29| PAGE

www.bimv.com

Heavy duty strenght towing gear components

30| PAGE

www.bimv.com

Stowage of Towing gear

31| PAGE

www.bimv.com

Bridle Stowage

Maintenance bridle & padlocks

Emergency bridles

32| PAGE

www.bimv.com

HIGHLINE TOWING BRIDLE

33| PAGE

www.bimv.com

MINIMUM B.L & STRAND ROPE

34| PAGE

www.bimv.com

SHACKLES STRENGHT

35| PAGE

www.bimv.com

Strenght Requirements Towing Gear

36| PAGE

www.bimv.com

TOWING LINE / PENDANT

37| PAGE

www.bimv.com

MULTIPLE STRAND WIRE ROPE

S- lay strand composition

38| PAGE

www.bimv.com

Strenght composition for mooring lines ( wire synthetic)1 ) Parallel yarn :

- Highest strenght conversion

- High modulus

39| PAGE

www.bimv.com

Wire/Rope strenght configuration

2) Parallel strand

3) Limited parallel strands

40| PAGE

www.bimv.com

Mooring materials

Strength:Construction:Fibre:(KN) Wire Rope

Aramid HM strong synthetic fibre

HMPE(high modulus polyethylene)= spectra or dyneema

LCAP(liquid crystal aromatic polyester) =vectran

Nylon( strong dry / 20% less wet)

Polyester( strength dry = wet)

Polypropylene ( floating)

41| PAGE

www.bimv.com

Minimum Break Load for 8 strand synthetics

42| PAGE

www.bimv.com

Wire mooring lines

Hexagon wire ( same diam)

Warrington ( diff diam)

Warrington Seal comp.

43| PAGE

www.bimv.com

Tension on wire lines only

2,2 GN ( giga newton) = 10 kip

44| PAGE

www.bimv.com

Only H.M mooring lines

45| PAGE

www.bimv.com

Wire lines & Auxilary synthetics

46| PAGE

www.bimv.com

Wire + Synthetic Fibre mixed Lines

47| PAGE

www.bimv.com

Use of lines by deadweight

48| PAGE

www.bimv.com

TUG HORSE POWER BHP

Field Moves Ocean Tows

Small semi-submersible

8-10,000 15 16,000

Large semi-submersible with propulsion

8 10.000 10 18,000

Large semi-submersible without propulsion

11 13,000 20 22,000

Small jack-up (100-150 ft. waterdepth)

6 8,000 8 9,000

Medium jack-up (150 250 ft. waterdepth)

8 10,000 12 16,000

Large jack-up (300+ ft. waterdepth)

10 16,000 15 18,000

49| PAGE

www.bimv.com

STILL WATER RESISTANCE vs SPEED

50| PAGE

www.bimv.com

AHTs Supplys Tugs

51| PAGE

www.bimv.com

52| PAGE

www.bimv.com

BOLLARD POWER AHT

BP is tractive force in tonnes or Kn

Depends on propeller type/ available nozzlesshape of hull draught & trim

Rules of thumb conversion BHP to B.P

- 0,9 x BHP x 1,1/100 (fix pitch - rudder)

- 0,9 x BHP x 1,2/100 (fix pitch - nozzle)

- 0,9 x BHP x 1,25/100 (contr.pitch - rudder)

- 0,9 x BHP x 1,4/100 (contr.pitch - nozzle)

53| PAGE

www.bimv.com

Bollard Power Test

Static bollard power

54| PAGE

www.bimv.com

Cont. BP test

Dynamic bollard power

55| PAGE

www.bimv.com

REQUIRED BOLLARD POWER

Required B.P=

(Displacement (t) x 60) : 100.000 + 40

In still water to move up to 3 4 knts

56| PAGE

www.bimv.com

Warranty B.P for ZERO Knts

-To remain in position meteo elements in opposite direction of heading

- Wind 44 knts

- Current 3 knts

- Wave height 25 ft

Beaufort Force 9Strong galeWind speed (knots): 41 - 47

Wave height (feet): 23 - 32Sea state: High waves; sea begins to roll; densestreaks of foam; spray may reducevisibility

57| PAGE

www.bimv.com

B.P (resistance factors)

Wind Resistance (Rw) ( area- wind velocity-still water tow speed)

Wave forming Resistance ( Rwf) ( hull shape- under water area)

Current Effect (Rc) ( wetted underwater area)

Hawser Resistance (Rh)

Wave height Effects (Rwh)

Shape Coefficient (Bc)

Height Coefficient ( Freeboard)

58| PAGE

www.bimv.com

Meteological aspects wind current

59| PAGE

www.bimv.com

Forecasting & prevailing synopsis

Petterssen, 1958

60| PAGE

www.bimv.com

Global Meteo Services

For accurate meteo planning acc. Wind, swell, current

Wefax by NOAA(Nat.Oceon.Atm.Ass)USA

AWT ( applied weather techno.)

BVS ( Bon Voyage System)

61| PAGE

www.bimv.com

WIND VERSUS DRAFT

62| PAGE

www.bimv.com

CANDRIL WAVE/CURRENT

63| PAGE

www.bimv.com

Example AHT

64| PAGE

www.bimv.com

EXAMPLE OCEAN AHT

16.500BHP emergency towing vessel 180 tons bollard pullfull Built 2002 chinaclassed lloyds +100a1 +lmc, ums2,258 grt / 677 nrt

1,800 dwt 67.40m loa x 15.50m beam x 7.50m x depth x 6.20m draft

2 x wartsila 16v 32lnd main engines 2 x cp propellers in nozzles2 x 9t bow thrusters1 x 8t stern thrustermax speed 17 knots1 x

triple drum ah/towing winch, 450t brake2 x 10t tugger winches 2 x 10t capstans 180 cbm

chain locker1 x j-hook344 m2 clear deck area - 12.6m x 27.3m10.0 t/m2

deck strength700 tons deck cargo1 x deck crane (3t @ 15m 420 cbm fresh water 1,200 cbm fuel oilfifi 1: 2 x 1200 cbm/hr fifi pumps accommodation for 20 persons in 17 cabins

65| PAGE

www.bimv.com

OFFSHORE POSITIONING

66| PAGE

www.bimv.com

ANCHOR PATTERNS

45 symmetric 8 line pattern

67| PAGE

www.bimv.com

10 line spread pattern

68| PAGE

www.bimv.com

12 line spread pattern (e.g FPSO)

69| PAGE

www.bimv.com

Pulling Barge spread

70| PAGE

www.bimv.com

Drilling Tender Spread Combination to other units

71| PAGE

www.bimv.com

Support Vessel Mooring Spread

72| PAGE

www.bimv.com

Mooring Catery Curves

73| PAGE

www.bimv.com

74| PAGE

www.bimv.com

POSITION CALCULATING

75| PAGE

www.bimv.com

Move to position

2 AHT

76| PAGE

www.bimv.com

3 AHTs

77| PAGE

www.bimv.com

To location

78| PAGE

www.bimv.com

Alongside platform

79| PAGE

www.bimv.com

Dropping anchors

80| PAGE

www.bimv.com

Running Anchors

81| PAGE

www.bimv.com

82| PAGE

www.bimv.com

Move of anchor

83| PAGE

www.bimv.com

PRELAID MOORINGS

84| PAGE

www.bimv.com

AHT Pull Leads

85| PAGE

www.bimv.com

86| PAGE

www.bimv.com

D.O.P use of 2 AHT

87| PAGE

www.bimv.com

MOORING CHAIN EQUIPMENT

88| PAGE

www.bimv.com

D.O.P in Confined Area

Use of 3 AHT

89| PAGE

www.bimv.com

USE OFYOKOHAMA SUPPORT & SUPPORT BOUY BLOCK

90| PAGE

www.bimv.com

Deploy yokohama support

91| PAGE

www.bimv.com

Yokohama Support Block

92| PAGE

www.bimv.com

Deploy midline support block

93| PAGE

www.bimv.com

Cont. M.S.L

94| PAGE

www.bimv.com

Cont M.S.L

95| PAGE

www.bimv.com

Midline support bouy blocks

96| PAGE

www.bimv.com

MULTIPLE POINT MOORING

97| PAGE

www.bimv.com

MULTIPLE SUPPORT POINT MOORING

98| PAGE

www.bimv.com

SURFACE BLOCK

99| PAGE

www.bimv.com

SINGLE POINT MOORING

100| PAGE

www.bimv.com

TAKE OFF ANCHOR POSITION

Chase of anchors

101| PAGE

www.bimv.com

TAKE off BUOY / ANCHOR

102| PAGE

www.bimv.com

LIFTING CHAIN

103| PAGE

www.bimv.com

Departure Sequence

Open water 2 AHT

104| PAGE

www.bimv.com

Departure confined space

3 AHT

105| PAGE

www.bimv.com

INSTALLATION OF CALM BUOY

106| PAGE

www.bimv.com

Calm buoy

107| PAGE

www.bimv.com

Positioning Jack up barge

108| PAGE

www.bimv.com

Jack up leg penetration

109| PAGE

www.bimv.com

Thank you & enjoy the offshore