JBS Group (Scotland) Ltd & JBS Fabrication Ltd, South View, Dales Industrial Estate, Peterhead, Scotland UK.

Tel: +44 (0)1779 479742 www.jbsgroupglobal.com

Subsea Presentation for Sea Axe Controlled / Mass

Flow Excavation Equipment

Jan 2021

➢ Established over 50 years ago. Operations in the Scotland, UK and Fort Lauderdale, USA.

➢ Global Services include:

➢ Design, manufacture, installation and commissioning of screw conveyor assemblies for operation in hazardous

environments.

➢ Steel fabrication from design, Finite Element Analysis (FEA) to manufacture and Installation.

➢ Subsea excavation using our patented next generation Sea Axe Controlled/Mass flow excavation equipment.

➢ Blast containment for ballistic, blast, frag, fire and arc flash protection using our BlastTac patented fabrics.

➢ Manufacture of nano and 5th dimensional structures though our USA based manufacturing plant in Fort Lauderdale Fl.

➢ JBS has developed from being a local North East of Scotland business to an international business. Currently working

in 80+ countries across the following sectors: Oil & Gas, Power Generation, Defence, Renewable Energy, Space and

Construction.

➢ Certification includes all major international accreditations to include DNV 2.7.1 & 2.7.3, Lloyds, BV, ASME,

NORSOK, CE and ATEX IECEx, ISO 9001:2015, BS OHSAS 18001:2007

Company Overview

Jan 2021 - www.jbsgroupglobal.com

Products Lines

➢Defence - arc flash protection for T26 Global Combat

Ships HMS Glasgow, Cardiff and Belfast.

➢Oil & Gas - screw conveyors, fabrication & engineering,

subsea excavation, blast, frag, fire and arc flash

protection fabrics.

➢Renewable Energy - PLAT I floating tidal energy

platform, wind energy subsea excavation, wave energy

subsea excavation and fabrication.

➢Power Generation - New York Power Authority blast,

frag and fire protection. Fabrication with Scottish &

Southern Energy.

➢Space – SpaceX, European Space Agency, Orbital

blast & fire containment.

Sectors

• The Sea-Axe is an advanced hybrid non-intrusive tool

• Cassette built design for easy shipment & maintenance

• Based on Mass/Controlled Flow Excavation (MFE/CFE)

• Low pressure, High volume

• Instantaneous & controllable vertical water column fluidizes the

seabed at a velocity ˃10 meters per second

MFE/CFE system offers the following advantages over other dredging

techniques:

- No physical contact with the seabed or seabed assets

- No need to dispose of spoil

- Real-time sonar imaging of the work site and progress

- Continuously variable power

- Utilisation from small, economic vessels

- Effective on a wide range of substrates, including sand, rock dump and clays.

Overview - Sea Axe Controlled Flow Excavation System

Personnel

• JBS use experienced, competent, skilled operatives for all subsea excavation activities.

• During a 12 hour shift we utilize 1x Supervisor and 2x Technicians.

• Soil strength from 80 to 200kPa, ancillary jetting equipment and one additional technician per shift is added.

• Sea Axe can remain submerged in water for up to 72 hours and requires minimal maintenance.

• 100% spares/redundancy supplied in our DNV 2.7.1 control room/spares container.

Tidal – can operate when propeller is submerged and there is enough clearance between the nozzle and the product.

Weather Limitations

Workability

Operation Sig Wave

Height

Wind

Speed

(kts)

Current

(kts)

Max Soil Strength

(kPa)

Deployment 2.0m 25 2.5 -

Recovery 2.0m 25 2.5 -

Operating 1.5m 25 2.5 200kPa (1m stand off,

jet assisted)

Sonar grab showing

excavated area

approx. 16 mtrs wide

for divers to work on

and secure located

subsea cable.

Sea Axe is deployed with

a hydraulic umbilical

securely fastened to

crane wire every few

metres. Close

communication with the

deck and bridge is

maintained at all times.

Sea Axe is lowered

through the splash

zone.

Deployment

Various Exit Nozzle Diameters

• These are set prior to deployment according to the project. A large

nozzle is used for sand and softer materials. A smaller nozzle is

used for harder soils.

Ancillary Agitation Lances

• Built as standard and utilized for breaking cohesive surface

materials in up to 200kPa shear strength.

Added Controllability

• Our patented twin chamber body section reduces torque and

assists with stability which means the Sea Axe can direct the water

column more productively over the target.

Sea Axe is capable of:

• Removing harder materials

• Creating narrower trenches

• Reducing the number of pass’s to achieve client specification.

Exit Nozzle Diameter Variables

Equipment Footprint: 2m x 2m x 2.5m (h)

Spread deck footprint: 10m x 8m

Self-Weight: 8 Ton, for ROV operation we can reduce

the weight to 4 tons

Nozzles: Variable exit diameter

Standard working depths: 3.5m to 500m+

Minimum Water Depth: 2 meters

Deployment: Self Deployment, Vessel crane, A Frame

Impeller Speed: 500 rpm

Maximum Torque: 6000Nm

Working Pressure: 350 bar

Max Oil Feed Flow Rate: 500 ltr / min

Flow Rate: ˃10000 ltr/s

Exit Water Column Speed: ˃10 m/s

Up-thrust: 4.0 Ton

Sonar: Project specific - 2D or 3D

Technical Specification

Standard Equipment Spread (Soils from 60 to 80kPa) and Typical Deck Layout Plan

Ancillary Jetting Equipment Spread for Soils from 80 to 200kPa (Clay, Very Stiff to Hard)

Sonar – 3D Multibeam real time image of Sea Axe operations. Super imposed on nav screen with vessel stand-off above.

Both Survey & DP officers have slave monitors to ensure effective and efficient communication in real time.

Sea Axe Sonar Operation from Control Room

Sectors

• Renewables

• Decommissioning

• Oil & Gas

• Civils

Sea-Axe Control Flow Excavation System

Applications• Pipe/Cable Burial

• Pipe/Cable Deburial

• Seabed Preparation

• Freespan Correction

• Sand Wave Levelling

• Salvage/Recovery

• IRM

Sea Axe is Manufactured by JBS in the UK

Sea-Axe Applications

Decommissioning/Mattress Burial & Deburial

J-Tube Entry & Monopile Access Free-Span Correction Sand-Wave Levelling

Wind Farm Excavation

Soil Sample Analysis - Example

Soil density and soil strength are affected by the principal soil mechanics of particle size,

leading to cohesion and therefore shear strength. Particle sizes visible to the eye and larger

are categorised as sands or coarser sediments (e.g. gravel, cobbles etc.).

These particle sizes have less cohesion, except temporary cohesion through quick

deformation. The particle size affects settlement (sedimentation) velocity, where particle

sizes of approximately 0.2 mm or larger start to hamper jet trenching. Particle size not visible

to the eye are categorised as Silts and Clays, i.e. particle sizes of approximately 0.06 mm

and smaller.

These much smaller grain sizes infer much more friction and increase the shear strength of

the soil.

Sample Projects (1) of (2)

1. Exposing Access for Maersk Tyra

Client: Subsea 7 / I Tech Services and Maersk Oil and Gas

Location: Maersk Tyra Field, Offshore Denmark

Depth: 50m

Soils: Mixed medium strength sands and clay up to 3m depth below natural seabed. Pipelines buried 1.5m below natural seabed

Vessel; Rock dump vessel Pompeii

Scope of Work: The operational procedure was to assist the client to excavate areas over 8”, 12” & 26” gas pipelines and create safe access exposing the

Gas pipelines for diver access.

2. Post Trenching Cable Transitions for Nordergrunde Offshore Windfarm

Client: NSW

Location: Nordergrunde Wind Farm, Offshore Germany

Water Depth: 6m – 20m. Tidal

Soils: Mixed medium strength clay up to 3m depth below natural seabed with extremely hard cohesive materials from 3–5m at more than 70kPa

plus shear strength.

Vessel: MSV Pegasus

Scope of Work: The Operational procedure was to assist the client and to ascertain the position of cables transiting from 70m out from and up to the

Individual monopiles. Proof of cable lay and acceptable required protection depths of these cables were essential. In total there were 19

monopiles - 38 cables. Data recorded by Fugro and our own Sea-Axe multi beam information was combined to produce the final proven

survey report for client.

Sea MFE/CFE – What makes us Different ?

Stability, Accuracy, Power and Controllability - Sea Axe is the most powerful single prop available resulting in the ability to trench using less passes to reduce vessel time and increase project efficiency.

• Sea Axe uses a single impeller. The impeller is bottom mounted with the exit nozzle directly below. This allows Sea Axe to be deployed in both shallow and deep water - One tool for multiple applications.

• The JBS patented inner vortex chamber makes Sea Axe the most stable MFE/CFE unit available. Sea Axe directs the water column over the target area more accurately and can cut deeper in single passes. This removes the need for additional excavation runs resulting in less vessel time and increased operational efficiency.

• Sea Axe harnesses the seawater and controls the flow exiting the nozzle to cut the seabed materials. This is comparable to natural erosion rather than dumping large quantities of water which create lunar landscapes. Sea Axe provides a uniformed and controlled excavation area.

• Minimum deck space required for complete spread, 10 square mtrs. Environmental biodegradable oils for motive power. Highly motivated and competent personnel with years of excavation experience and a willingness to utilise client personnel to train as the Sea-Axe team thereby reducing overall cost.

• Can be operated with an ROV and in very shallow waters (2 meters).

JBS Group Clients

Head Office

JBS Fabrication Ltd

South View

Dales Industrial Estate

Peterhead AB42 3GZ

Scotland

UNITED KINGDOM

UK Tel: +44 (0) 1779 479742

USA Tel: + 1 713 203 0631

www.jbsgroupglobal.com

Contact Information

Sea Axe - Shaping the

Future of Seabed Excavation