agr subsea ltd - enhanced · pdf fileagr subsea ltd agr subsea ltd union plaza 1 union wynd...

AGR SUBSEA LTD

AGR Subsea Ltd Union Plaza

1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]

www.agrsubsealtd.com

SSeeaaVVaattoorr

MMaassss FFllooww EExxccaavvaattoorr

The SeaVator is the latest design of underwater excavation and pipeline trenching system from the world’s leading

specialist. AGR Subsea Limited offers a range of high performance hydro-dynamic excavation (mass flow) tools

capable of working in all non-cohesive soils and soft clays in extreme environments, from shallow coastal regions

to deep ocean depths.

Each system is fully self-contained with a purpose designed handling system, diesel driven power packs, control

cabin, umbilical reel and fully equipped workshop with stores area.

Control and monitoring of trenching and excavation operations is by dual head, multi-beam sonar allowing

continuous operations in nil visibility sea conditions. The Subsea units are extremely robust, constructed from

stainless steel and require minimal field maintenance.

Head Office:

AGR Subsea Ltd

Union Plaza

1 Union Wynd

Aberdeen, AB10 1SL, UK

Tel: +44 1224 629 280

Mob: +44 7917 690 470

Contact :

Michael Noble

Business Development Manager

AGR Subsea Ltd

Aberdeen Head Office

Tel: +44 1224 629 284

Mob: +44 7825 076 860

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


SSeeaaVVaattoorr

MMaassss FFllooww EExxccaavvaattoorr

• Deployable from a range of DP Vessels

• Compact, Efficient, Durable design

• Non-contact excavation technique

• Can excavate stiff clay up to 100kPa

when used in conjunction with jetting

system.

• Proven technology in the field

Applications

• Localised Excavation • Free-span Correction

• Sand Wave Levelling • Tie-in & Crossing

Excavation

• Back Filling • Pre-lay Pipeline Route

Preparation

• Post-lay Pipeline Route

Preparation • Rock Dump Removal

• Template and Wellhead

Cleaning

• Burial of Redundant

Structures

• Clearing of Harbour and

Shipping Channels • Salvage Projects

• Glory Holes • Decommissioning work

Weights & Dimensions

Total Weight (in air/submerged) 3880 kg / 3570 kg

Diameter 1600 mm

Width (including outriggers) 5000 mm

Height 1200 mm

Instantaneous Excavation Rates*

Sand 1100 m³/Hr

Silt 900 m³/Hr

Gravel 500 m³/Hr

Rock Dump 250 m³/Hr

Clay (<5 kPa) 300 m³/Hr

Performance

Thrust 2750 kg

Water Velocity 8.0 m/sec

Inlet Pressure 100 – 160 bar

Drive Flow Rate 275 – 430 lpm

Operational Water Depth 5m - Unlimited

Max Tidal Current 3.5 Kts

* Excavation rates quoted are indicative only and are not guaranteed.

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


SeaVator & V – Jet Assembly

Total Weight (in air) 4280 kg

Total Weight (submerged) 3832 kg

SeaVator & Multi – Jet Assembly



SeaVator & Mono – Jet Assembly



Instantaneous Excavation Rates (SeaVator with Jetting Equipment)*

Clay (5-20 kPa) 200 m3/hr

Clay (20-50 kPa) 100 m3/hr

Clay (50-100 kPa) 50 m3/hr Excavation rates quoted are indicative only and are not guaranteed.

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


PPrroojjeecctt TTrraacckk RReeccoorrdd

Project name Tangguh Pipeline Trenching & Route Preparation Project

Equipment used SeaVator; V Jet; Dual SeaBat 9002 Sonar

Operator BP

Client Saipem

Location Indonesia

Pipeline diameter 24”

Trench length Multiple short sections of pipeline route preparation – pre-sweeping through sand waves and sediment, dispersing debris and post pipe-lay free-span correction.

Water depth 70m

Soil strength Sand, sediments and soft clays.

Vessel names DSND Surveyor

Comments

This project was undertaken in a very remote location without any regular shore based support. The site conditions were very challenging as the area possessed extremely uneven and rough seabed topography with highly variable soil conditions, including unconsolidated sands and silts, soft mud and stiff clays. Notwithstanding strong seabed currents of up to 3.5 kts and a 4 metre tidal range the operation was completed successfully.

SeaVator Equipment Spread

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


Project name Pinghu Oil Pipeline Burial Project (Live Pipeline)

Equipment used SeaVator, V Jet System 1200 HP Version, Dual SeaBat 9002 sonar

Operator China National Offshore Oil Corporation (CNOOC)

Client China National Electronic Equipment Company (CNEEC)/ Merloni TermoSanitari (MTS Group)

Project period 2002

Location Dai Shan Province, South China Sea


Trench Details 3 km, up to 2.9 metres to TOP.

Water depth 2 – 27 metres

Soil strength Sand and Clay From 3 – 50 kPa

Vessel names Yang Gang Bo 16

Comments

This project took place in very severe and turbid coastal sea conditions interrupted by typhoons with high prevailing currents of up to 7.2 knots across an estuary. Trenching operations were conducted from a shallow drafted moored barge operated by CNEEC. The majority of the work was conducted in currents speeds of approximately 3.5 knots with the pipeline in a full production at 2000 psi operating pressure.

SeaVator & V Jet Assembly (Parallel Orientation)

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


Project name PTT 3rd Pipeline Trenching Project

Equipment used SeaVator; V Jet; Dual SeaBat 9002 Sonar

Operator PTT

Client Hyundai

Project period March to November 2006

Location Thailand


Trench length Several discrete sections of pipeline trenching along a total pipeline length of 90 km

Water depth 40m

Soil strength Clay soils with strengths from 5 kPa to 300 kPa.

Vessel names MV Sartu Santabong

Comments

Generally the upper 1.5m of seabed consisted of sand and gravelly silts in some areas and 1 to 50 kPa clays in other areas. For such soils the SeaVator with 1,200hp V Jets was used. In order to carry out the job efficiently a SeaVator with 4,500hp V Jets was also used areas possessing higher soil strengths to achieve the required excavation depth.

SeaVator & Multi – Jet Assembly

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


Project name LGTS Green Stream Project

Equipment used SeaVator; V Jet (both 600 and 1,200 hp versions); Dual SeaBat 9002 sonar

Operator Agip

Client Saipem/Sonsub

Project period September 2003 to July 2004

Location Libya and Sicily


Trench length Total of 30 km. Trench depths varied: 14.4 km to 1.5 m; 6.4 km to 3.6 m; other areas to 4 and 4.8 m trench depths

Water depth 4.5 - 55 metres

Soil strength Loose sand; dense sand; weak sand stone & clays up to 37 kPa

Vessel names MV Polar Prince; MV Sentinel; MV Skandi Inspector

Comments

This project required a wide range of different trench depths in a variety of soil conditions. In addition the SeaVator & V Jet systems were used to excavate areas up to 0.5 km in length and 5 metres deep to allow inspection and repairs to the pipeline and to bury boulders and debris under the pipeline. The SeaVator (using tilt beam) was also used to backfill sections of trench.

SeaVator & V – Jet Assembly (Perpendicular Orientation)

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


Project name Giovanna field IRM

Equipment used SeaVator; V Jet ; Dual SeaBat 9002 Sonar

Operator ENI

Client Saipem/Sonsub

Project period February/March 2008

Location Adriatic Sea

Excavation Depth Down to 3m below seabed

Water depth 42m – 80m

Soil Strengths Loose sands, natural backfill, some stiff clays

Vessel name Texas Horizon

Comments SeaVator was used to debury a variety of pipelines for inspection/repair work. V-jets were deployed to dig some areas of stiff clays to allow access to the underside of trenched pipelines.

SeaVator and Dedicated LARS

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


Project name Ormen Lange Southern Field Extension Route Preparation Project

Equipment used Seavator Aquadrive; ClayCutter X

Client StatoilHydro

Project period July 2008

Location Offshore Norway

Trench Width 5m

Trench Length 300m

Water Depth 850m

Soil Strength Clay from 15 kPa to 450 kPa Shear Strength

Vessel name Island Valiant

Comments

ClayCutter X was mobilised in conjunction with AGR’s new build trenching pumps to prepare the seabed around the Ormen Lange field. In total 3,400 m3 of clay was excavated at rates of up to 500 m3/hr. The excavation was split between 10 separate sites of varying complexity and soil strength. Overall the project was completed in 17 days, compared with an initial prognosis of 32 days for 1975 m3. All of the equipment performed flawlessly and the project was completed without any harm to personnel or the environment.

Pre-Excavation 3D DTM Post-Excavation 3D DTM

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


Project name Black Tip Pre-Lay & Post-Lay Intervention Project

Equipment used SeaVator; V-Jet; Dual SeaBat 9002 Sonar

Client Saipem

Project period September 2008 to February 2009

Location Darwin, Northern Australia

Pipeline Diameter 18” & 12” Pipelines

Water depth 70m

Vessel name Miclyn Endurance

Comments

The SeaVator scope of work included pre-pipelay sweeping of sand waves and post-pipelay freespan correction. The upper 1.5m of seabed consisted of sand and gravelly silts in some areas and 1 to 50 kPa clays in other areas. For such soils the SeaVator with 1,200hp V Jets was used.

Post-Excavation 3D DTM* (Plan view) Post-Excavation 3D DTM* (Isometric View)

*Images produced by Fugro for AGR

AGR SUBSEA LTD


1 Union Wynd

Aberdeen

AB10 1SL, UK

Tel: +44 1224 629280

[email protected]


Project name Trans Gas Indonesia Pipeline Repair Project

Equipment used Seavator 60 bar Mono – Jet ; Dual SeaBat 9002 Sonar

Operator TGI

Client Global Industries

Project period February/March 2009

Location Offshore Sumatra, Indonesia

Excavation depth 2m below seabed

Trench length Variable

Water depth 50m

Soil strength Loose sands, clays up to 100 kPa

Vessel name Sanko Angel

Comments

SeaVator was used to excavate boxes around a pipeline to enable access for clamps prior to a hot tap. Soils were expected to range up to 100 kPa so a high pressure pump and extended central jet were employed to cut these stiff clays. Once on location the soils ranged up to 395 kPa, beyond the capability of the equipment, but soils up to 100 kPa were excavated successfully – well beyond the usual operating limits for mass flow equipment.

SeaVator & Mono – Jet Assembly

agr subsea ltd - enhanced · pdf fileagr subsea ltd agr subsea ltd union plaza 1 union wynd...

Documents