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Subsea Mattress
FoundOcean
Pro-Dive
Marine Services, in conjunction with FoundOcean, provides specialized
geo-technical and structural services to the Canadian oil and
gas industry. Focusing on installation, maintenance, repair
and protection of platforms, templates and pipelines, a range
of activities from feasibility studies through conceptual design,
trials, procurement and construction to the provision of personnel
and equipment for field operations are undertaken.
In 1989 Pro-Dive Marine Services entered into an exclusive agreement
with FoundOcean to provide the FoundOcean line of products to
the Canadian marketplace. Subsequently, both companies have
successfully undertaken various client-specific projects.
Pro-Dive Marine Services and FoundOcean continually endeavor
to comply with our client's specific requests. Emphasizing safety,
quality products, and on time delivery, we can provide innovative
low cost solutions to subsea related problems.
Services
Offered
Pro-Dive Marine Services, in conjunction with FoundOcean, offers
an extensive range of products and services, which include:
- Consultation, feasibility studies and systems related
engineering
- Flexible concrete mattresses, precast units and ScourMat
- Grout mixing and pumping equipment
- Pipeline protection and stabilization
- Design and manufacture of fabric formworks
- Ballasting using viscous and heavy slurries
- Pipeline abandonment and plugging
- Inspection, repair and strengthening of offshore structures
The following subsections summarize the specialized offshore
construction services offered by Pro-Dive Marine Services and
FoundOcean.
Flexible
Concrete Mattresses and Pre-Cast Units
- Flexible pre-cast concrete mattresses are used for weight
coating, support, stabilization and protection of pipelines
and umbilicals. Lift frames are also available for subsea
installation by diver, ROV, or top side deployment.
- Precast concrete units for crossings, ramps, supports
and pipeline protection.
 Massiv
Mesh
Massiv Mesh is a flexible, concrete mattress consisting of hexagonal
concrete elements linked together with high strength non-degradable
polypropylene rope.
The mattresses have many uses in the protection, support and
stabilization of subsea structures and have been designed for
their flexibility and ease of handling during installation.
Flexiweight
 Flexiweight is a
concrete mattress consisting of hexagonal section bars, reinforced
with steel and linked by polypropylene rope. Flexiweight is
flexible, robust, designed for ease of installation and available
in a range of sizes and concrete densities.
Flexiweight has an established track record for such applications
as Stabilization, Crossovers, Trawlboard, Cable protection and
Scour prevention.
ScourMat
 Tides and currents
cause erosion of the seabed adjacent to solid objects known
as scour. Scour affects the stability of pipelines and subsea
structures and can also cause considerable damage to coastal
areas.
ScourMat is made from a series of polypropylene fronds attached
to a polypropylene net and linked by a framing network of webbing
that extends around the periphery and crosses the mat at regular
intervals. A number of specially designed anchors are attached
to the webbing.
Underwater, the fronds open out to form a fan like array, which
slows down the local current and causes particulate matter to
settle. This eventually builds up a new sandbank, effectively
reinstating the seabed. This fiber-reinforced sandbank will
then resist further erosion.
SeaMat
SeaMat, a stabilization and protection system, based on bitumen-coated
aggregates encased within a man-made woven fiber envelope, complete
with integral lifting straps. Reinforcement is achieved by the
use of a polypropylene Geogrid cage.
SeaMat is designed to remedy the following subsea problems:
- Scour
- Crossover protection
- Impact damage
Provision
of Mixing and Pumping Equipment
Pro-Dive Marine Services, in conjunction with FoundOcean, has
an extensive range of cement mixing and pumping equipment, for
all types of offshore construction activities, available. The
equipment is capable of mixing very low water content (viscous
and heavy) slurries. A wide selection of pump sets provides
the optimum rate required for the best results. This equipment
has been used for the following applications:
- Grouting activities associated with fabric formworks
- Platform construction pile grouting
- Perform repair and maintenance
- Template / structure ballasting
- Concrete structure repair and maintenance
- Pipeline plugging and well abandonment
Pro-Dive Marine Services has the total capacity and flexibility
to work as a primary contractor in association with design engineers,
operators and contractors, throughout the various phases of
a project, from solution design through to the implementation
of the project.
Fabric
Formwork
 Engineering fabric
formwork offers a considerable range of possibilities to the
offshore industry. In addition to the standard pipeline supports,
specially designed fabric formwork is supplied for specific
requirements, including:
- Mattresses for load distribution
- Pipeline crossings
- Riser supports
- Anti-scour systems
- Fabric seals for structural work in platforms
These varied systems have been used in water depths of 340 meters;
deeper waters are within the scope of the plant. Subsea procedures
are developed to ensure that the underwater contractor correctly
applies the solutions. Attention to detail ensures that subsea
time, whether for divers or ROV's is reduced, thus reducing
the overall cost of the operation.
Specialized
Grouting Equipment
Pro-Dive Marine Services and FoundOcean have acquired specially
developed grouting equipment suitable to the wide range of work
undertaken in the offshore environment. The well proven colloidal
mixing principle gives excellent grout qualities suitable for
underwater applications and has been adopted for all equipment.
The main characteristics are:
- Compact skid mounted module units for restricted working
space
- Established colloidal mixing system for underwater grouting
- Provision of pressurized bulk cement silos
- Ability to handle bagged materials (if required)
- A range of grouting outputs and injection pressures to
suit application
- Facility to place grout at substantial underwater depths
In addition to fabric related applications Pro-Dive Marine Services
and FoundOcean have the necessary expertise to undertake all
aspects of offshore grouting including:
- Infilling of tubulars
- Annulus grouting
- Foundation underbase grouting
- Structural repairs
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