IHC Engineering Business Ltd - Subsea UK manchester.pdf · IHC Engineering Business Ltd ... •...

IHC Engineering Business Ltd

Ralph Manchester Trenching Chief Engineer


The technology innovator.


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Introduction to IHC EB • EB established 1997

• Joined IHC group in March 08

• Current Order book exceeds £80m

• Approximately 170 staff

• Turnkey Projects Business

• IHC Engineering Business (IHC EB) delivers bespoke engineering solutions for complex offshore applications. • Working with clients across the offshore oil and gas, submarine telecoms and renewable offshore power industries. We offer a full design and build solution from concept development, product delivery, through to life cycle support. Core expertise includes pipe and cable lay, subsea trenching and offshore handling. • Delivering innovative equipment that provides a commercial and technical advantage; working in partnership with customers on projects ranging from fully integrated vessel systems to the rapid supply of sub-systems.


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Facilities • Stocksfield Hall - Stocksfield

• Port of Tyne - Newcastle


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i-Trencher

Advanced Scada Control Systems Safety Critical PLCs Software not only to ISO 9001 but also IEC61508 SIL 3 systems designed and verified.

IHC EB Advanced Control Systems

IHC EB J-LAY System


5

Previous Subsea Trenching Equipment


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i-Trencher


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Wind farm max depth min depth

Round 3 m m

Moray Firth 57 30

Firth of Forth 80 30

Dogger Bank 63 18.6

Hornsea 70 30

Norfolk 70.1 5

Hastings 62 19

West of Isle of Wight 56.3 27.8

Bristol Channel 60.9 19.5

Irish Sea 78 28

maximum 80 30

minimum 56 5

average 66 23

Round 3 Wind Farm Locations


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Expected wave climate

100 year extreme wave heights Wave data at Ijmuiden Munitiestortplaats

Peak wave height occurances southern north sea(IJmuiden munitiestortplaats 1979-1993)

0

10

20

30

40

50

60

0 1 2 3 4 5 6 7 8 9 10

Peak wave height (m)

occu

ranc

e pr

obab

ility

(%)

max min


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Environment Hydrodynamic loads on Trencher

Lift and vehicle drag streamlines


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Environment Minimum vehicle seabed loading

The upper bound of an operable weather window for Interarray trenching is: Wave height 3m time period 7.5 seconds in line with the world wide trade scatter diagram maximum water surface current speed 4 knots The Approximate vehicle dimensions for an interarray cable trenching machine: Vehicle size 7m x 5m x 3m (L,B,H,)


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Sea bed topography


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Track suspension

•Getting an even ground pressure is important to maximise the traction available.

•50% reduction in impact loading correspondingly increases component life •Churchill tank © Imperial War Museum (TR219)

•D9 courtesy of Caterillar


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Ground pressure


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Mobility and steering

Wind Farm Layout Courtesy of Sheringham Shoal

Offshore Wind Farm,

Scira Offshore Energy Limited.

•The interconnecting cables do not always follow linear paths.

•The ability to turn while trenching is important, especially for the approach to sub stations with multiple cable terminations


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Traction improvement:

0.2 0.4 0.6 0.8 10

0.2

0.4

0.6

0.8

2 tracks even ground pressure2 tracks undulating ground conditions4 tracks undulating ground conditions

Loss of traction during manouvering

Coefficient of lateral resistance

Nor

mal

ised

effe

ctiv

e tra

ctio

n

1

0

η.t i

η.tw i

η.4T i

10.1 µi


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Tool Undercutting


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Tilting Tool


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Tilting Tool

•Tilting the tool reduces the undercut of the lower section in tight radii turns

•This increases trench stability.


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Depressor tracking

Depressor is allowed to rotate along the line of the cable ensuring MBR is maintained with no discontinuity.


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Hi-Traq Trenching system

• 15 Tonne Jetting Vehicle,30 Tonne Multi Tool Vehicle

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