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FABRICATION SERVICES
Table of contents
1
Company ..................................................................................................................................................... 2
2
Overview of TWD Fabrication Services ........................................................................................................ 3
3
2.1
Cradle supports for large luxury yachts .................................................................................................. 3
2.2
Manifold overboarding operation .......................................................................................................... 4
2.3
Lifting frames for subsea installations .................................................................................................... 4
2.4
Guiding frames for flange gripper ........................................................................................................... 5
2.5
Suction bucket jacket clamps .................................................................................................................. 5
2.6
Pile upending tool ................................................................................................................................... 6
2.7
Hydrohammer frame .............................................................................................................................. 6
Organization ............................................................................................................................................... 7
3.1
Project organization ................................................................................................................................ 7
3.2
Project team............................................................................................................................................ 8
3.3
Working method ..................................................................................................................................... 8
4
Overview services ....................................................................................................................................... 9
5
Example of budget overview ..................................................................................................................... 10
TEMPORARY WORKS DESIGN BV
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FABRICATION SERVICES
Company
TWD is a flexible engineering firm specialized in the design and fabrication of temporary works, structures
which facilitate the construction of permanent works. Our thorough knowledge of structural and
mechanical engineering, finite element methods, design for offshore conditions, and steel fabrication
processes enables us to develop creative solutions to meet the wide variety of client demands.
Projects range from the design of a piling template used to drive foundation piles for offshore wind
turbines, a motion study for an offshore lifting operation, to a parbuckle tool for a salvage project.
Flexibility, practicality, and creativity are the driving forces behind each of our designs and our enterprising
work ethic.
We offer cost-efficient solutions for the heavy civil, offshore, and salvage industries, specializing in the
custom design, procurement and fabrication of:
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Pile handling tools
Lifting tools
Seafastening
Cable handling equipment
Support structures
Vessel motion analyses
We are able to assist in each stage of a project’s execution, whether it be drafting, engineering,
commissioning, or fabrication management. Our talented, international team of mechanical, civil, and
maritime engineers is available for your requests.
For more information please visit our website: http://www.twd.nl
Site visit during the fabrication phase of the Oceanco cradle support project
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FABRICATION SERVICES
Overview of TWD Fabrication Services
TWD Fabrication Services aims at delivering turnkey products based on designs that have been engineered
by TWD. We offer an Engineering, Procurement and Fabrication Management (EPFM) service to minimize
work load for the client and maximize efficiency in terms of quality, planning, and costs. We relieve the
client of a time consuming yet key part of their operation by ensuring the on-time, turnkey delivery and
installation of all temporary works.
Our EPFM service includes:
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Engineering
Certification
Procurement
Fabrication management
Testing and commissioning
Operational assistance
In the sub-paragraphs below, a selection of TWD’s Fabrication Services projects are described in more
detail. References can be provided upon request.
2.1
Cradle supports for large luxury yachts
TWD designed and constructed support cradles for two of Oceanco’s large luxury custom yachts. A practical
design met the clients design requirements: to enable transportation on self-propelled modular
transporters, to support the yacht hull throughout the construction process, and to allow finishing works on
the outside of the hull. For one of the yachts hydraulic supports were integrated into the 100mT steel
cradles, ensuring correct distribution of the load and protection of the hull. Wooden CNC milled blocks were
placed between the cradle and hull to ensure good shape agreement and even pressure distribution.
Certification of the design and construction by Lloyd’s Register was also arranged by TWD.
Support cradles during transport on self-propelled modular transporters
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2.2
FABRICATION SERVICES
Cradle supports Manifold overboarding operation
SAL Heavy Lift was in need of a partner to determine the operations for the overboarding of four subsea
manifolds. The involvement of TWD’s Fabrication Services was twofold. Firstly, the EPFM service was used
for all temporary steel that had to be installed on deck. This ranged from a small wire inboarding chute to a
large overboarding tool for the linkplate-shackle assembly. Secondly, a procurement officer from TWD
worked full-time at the client’s office to relieve the project team from arranging the procurement of all
items required for the project and maintaining a clear budget overview.
Overboarding tool for the linkplate-shackle assembly during installation on the MV Lone
2.3
Lifting frames for subsea installations
Jumbo requested TWD to perform the EPFM of three lifting frames for the installation of anchor assemblies
for a subsea floating freshwater pipeline. A square frame was used to lower 240mT anchors to the seabed.
A buoy frame lowered buoys to target depths of 280 meters. A third frame was used to lower a 16mT
weight for stability. TWD facilitated certification by Lloyd’s Register, arranged procurement, supervised
fabrication, and organized load testing, all within a demanding time frame.
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Square frame during 275mT load test
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2.4
FABRICATION SERVICES
Guiding frames for flange gripper
ArGe Baltic 2 Foundations required guiding frames in order to safely place and remove a flange gripper on a
jacket. The frames ensured easy placement of the gripper and also protected the sensitive access structures
around the flange from a swinging flange gripper during operations. TWD provided its full EPFM service,
including design certification by DNV-GL and management of the fabrication of 18 guiding frames in Poland.
The entire project from concept design to frame delivery was performed within 10 weeks.
Guiding frame in production in Poland
2.5
Suction bucket jacket clamps
GeoSea required a seafastening solution for the transportation of Suction Bucket Jackets (SBJ) to the
Borkum Riffgrund offshore wind farm. TWD created an innovative and operation-friendly design that
clamps the suction buckets on deck. The clamp design was optimized for fabrication in close cooperation
with the steel constructor, and a 400mT load was performed at the fabricator for verification. Certification
was done by DNV-GL. Furthermore, the project entailed the EPFM of small steel items to assist the
underwater ROV operations. TWD’s EPFM service for this project clearly contributed to its final success.
One of the twelve SBJ clamps after conservation
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2.6
FABRICATION SERVICES
Pile upending tool
Weserwind, a steel constructor in Germany, was building an upending tool based on a TWD design. In the
final phase of fabrication, the tool needed to be certified by a certification society; a typical Fabrication
Service offered by TWD. Certification was procured and managed by TWD and carried out by Lloyd’s
Register, both the design review and field surveys at Weserwind. Furthermore, TWD assisted Weserwind
during fabrication, procured the steel wire that was part of the design, and operated the system offshore.
Pile upending tool after installation on the Stralsund barge
2.7
Hydrohammer frame
Scaldis requested TWD to provide its EPFM service for the creation of a hydrohammer frame. The frame
was used to temporarily store a hydrohammer on a barge at a convenient location during offshore
operations. Within a demanding time frame, TWD designed, procured, arranged certification, and managed
fabrication of the structure to ensure the on-time delivery of the frame. Having relieved the client of this
part of the project, they were able to focus their attention on other critical aspects.
Hydrohammer frame in production
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Organization
3.1
Project organization
FABRICATION SERVICES
The strength of TWD’s EPFM services becomes apparent when one looks at the two project organizational
overviews shown below. As an expert on our own designs, and steel design and fabrication in general, TWD
is the best party to communicate directly with the certification company, steel fabricator, and other
subcontractors concerning procurement and fabrication management. Based on our knowledge of the
design we can explain the required work to the subcontractors, find the best price, and optimize planning.
The client only deals with TWD and will be regularly updated on planning, budget, and other project specific
developments.
Project organization overview
The strength of the EPFM project is also apparent from a broader perspective, as depicted in the two
figures below. In the traditional procurement model, the client is limited to its own supplier database and
experience. With the EPFM model, TWD considers the suppliers and experience from a range of projects to
select the best parties to be considered for the work at hand. All potential suppliers are part of the
procurement database system at TWD. This database includes information about the supplier’s quality
system, previous quotations, and past project evaluations. As an independent player in the field with
detailed knowledge of the design, TWD is the right party to select and evaluate suppliers for a project in
cooperation with the client.
Procurement models
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3.2
FABRICATION SERVICES
Project team
TWD basic project organisation diagram
The project engineer (PE) in the TWD project organisation plays the central role and is the primary point of
contact for the client. The PE focuses on one single project and guides the complete process from kick-off to
turnkey delivery. In this role, the PE translates client wishes into practical, safe, and economical designs.
The PE is responsible for budget and planning and supervises the team of engineers, draftsmen and
procurement officers.
The lead engineer (LE) supervises the project team and plays an active role in the design process. The LE
oversees the design process, suggests concepts, and performs quality checks on every deliverable.
The Manager Fabrication Services (FM) supervises the procurement and fabrication management part of
the project. His specialized experience in these fields will be beneficial for the project’s success.
The senior draftsman (SD) is responsible for timely delivery of drawings, revision status, work distribution
and planning of the draftsmen. The SD is in charge of the master model and analyzes the sub-assemblies
provided by the draftsmen regarding overall function, clashes, and consistency.
3.3
Working method
The working method for an EPFM project is not set in stone and can be easily adjusted to the client’s needs.
Most of TWD’s clients are involved in projects where delay and/or failure is very expensive. This is why we
consider quality and planning the two key factors for a successful project. Our preferred working method is
therefore to act ‘on behalf of’ the client, meaning we keep a transparent and open book budget, see section
5 for an example budget report. All work is performed on a reimbursable basis. Purchasing is performed by
TWD on a cost-plus basis, however, contracts with subcontractors are preferably made directly with the
client, as there is no added value when TWD is contractually in between.
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FABRICATION SERVICES
Overview services
The overview below shows the different services that are offered by TWD. Allowing TWD to manage the
entire design process, from drafting to commissioning, will result in short communication lines, a solid
project overview, and savings in time and costs.
Services overview
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FABRICATION SERVICES
Example of budget overview
Budget overview for Engineering, Procurement and Fabrication Management project
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