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CTR FORM

COST TIME & RESOURCE

PROJECT : DWT Subsea FEED CONTRACT No.: WORK ORDER Nr. :

CONTRACTOR:

CUSTOMER : Tullow Ghana Limited

Planned Start: Planned Finish : Duration :

CTR/Activity No : Title : Date :

1010 Project Management Rev :

Author :

Objective

To perform the project and interface management activities associated with implementation of the subsea FEED.

Activities Description

Subsea FEED team management

Schedule management and progress reporting

Liaison with Client Definition of codes and standards

Change control Weekly reporting and progress meetings

Overseeing development of final FEED documentation and ITT packages

Input Requirements

Output / Deliverables

FEED schedule

Schedule management and progress reporting

Liaison with Client

Definition of codes and standards

Change control

Weekly reporting and progress meetings

Overseeing development of final FEED documentation and ITT packages

Notes, Assumptions, etc

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1020 Quality Assurance Rev :

Author :

Objective

Quality Assurance for the Subsea FEED


Develop and issue QA Manual for project use during subsea FEED

Develop and Issue QA Plan for subsea FEED

Input Requirements


Subsea FEED QA Manual

QA Plan for FEED Audit Schedule

Audit Reports

Corrective Action Reports

Follow-up Reports



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1030 Document Control Rev :

Author :

Objective

Management of Project Documents


Produce Subsea FEED Document Control Manual

Maintain Document Register Control and issue outgoing documentation

Receipt and control of incoming documentation

Input Requirements

Key deliverable dates Deliverables Schedule (CTR 1050)


Master Document Register (MDR)



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1040 FMECA and RAM Studies Rev :

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Objective

Define sparing and redundancy philosophy for subsea facilities


Perform a FMECA study to identify, record and understand potential failure modes and uncertainties

Quantify reliability and availability of individual items of equipment Development of models to quantify reliability, availability and maintainability of each defined system to cover turn-up,

operational and mechanical cases

Input Requirements

Client supplied reliability data Manufacturer’s data

OREDA


Report on FMECA studies Report on RAM studies

Input to project Sparing Philosophy for subsea facilities


CTR FORM



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1050 Scheduling Rev :

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Objective

Planning services to the overall project plan


Generate and maintain a Level 2 schedule for the overall subsea development from FEED to project completion. The

project schedule shall reflect and integrate Client milestones and planned field activities Identify a Consents and Approvals schedule

Integrate data from procurement support

Input Requirements

Information from procurement support (CTR 1060)


Level 2 schedule for post-FEED activities



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1060 Procurement Support Rev :

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Objective

To establish a subsea Long lead Item (LLI) List for the project (taking into account of, but not limited to, COMPANY

Frame Agreement items) To develop a post-FEED subsea procurement plan for the project

To develop technical specifications and datasheets for long lead items included (but not limited to) COMPANY Frame Agreement items.

Support Company in the technical evaluation of offered components under the frame agreement

Assist Company in developing all technical documentation for the frame agreement work order packages including scope

of supply, supplier data requirements list (SDRL) etc in the requisition documentation


Contact with vendors to establish current (and future) expected lead times for equipment and materials supply (outwith

COMPANY’s Frame Agreements)

Discuss and agree likely durations for post FEED procurement activities

Develop specifications and data sheets

Assist with technical queries during tendering period

Carry out technical evaluation of tenders

Assist in the development of work order package requisitions, SDRLs.

Input Requirements

Definition of subsea facilities and equipment required


Subsea Long Lead Items (LLI) List

Produce Vendor Bid Lists for the identified LLI

Post-FEED procurement plan for input into the overall project schedule (Level 2)

Specifications,

Technical evaluation criteria, Requisition and SDRL development


Company is expecting 3 Frame agreement tenders per frame agreement type. Contractor should anticipate technical

queries and technical evaluation with 3 tenderers.

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1070 Cost Estimating Rev :

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Objective

To provide a comprehensive life cycle cost report, including abandonment, for the management, engineering,

procurement, installation, testing, pre-commissioning and commissioning of the subsea facilities


Contact with vendors to establish budget estimates as required outside COMPANY’s Frame Agreement items Agree a cost basis with COMPANY

Produce a tabulated cost estimate for CAPEX, OPEX and abandonment costs

Input Requirements

Agreed cost norms

Discussion with vendors as required.


Cost Estimation Basis Report

Field Development Cost Report for subsea equipment and facilities and their installation and pre-commissioning



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1080 Risk and Opportunities Rev :

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Objective

To identify risks and opportunities for the project

To investigate risk reduction, mitigation and management measures


Subsea presence at formal project Risk Identification and Assessment Workshop Input into the Risk Register, as required

Input to Risk reduction and mitigation report as required

Input Requirements


Subsea input to Risk Identification Report

Subsea input to Risk Register

Subsea input to possible risk reduction measures and management of risk



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1090 IVB Interface and Support Rev :

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Objective

To provide an interface with COMPANY’s IVB

To provide technical support in response to COMPANY’s IVB queries/comments


Provide a technical interface with COMPANY’s IVB during the FEED process Provide technical responses to COMPANY’s IVB queries, reviews and comments

Input Requirements

Queries and comments received from COMPANY’s IVB


General discussion with COMPANY’s IVB

Formal responses to COMPANY’s IVB queries/comments

IVB Approval of Subsea FEED Deliverables



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2010 Basis of Design Rev :

Author :

Objective

To assist with updating of the project Basis of Design


Provision of subsea data and change of data as required as the FEED progresses

Input Requirements


Basis of Design updates



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2020 Project Philosophies Rev :

Author :

Objective

To assist with the development of system design and operation philosophies for the project


Provision of subsea input into the various philosophies to be developed as part of the overall FEED

Input Requirements

Fishing Intensity Studies (if available or relevant)

Basis of Design All party workshops


Operations Philosophy

Materials Selection Philosophy Corrosion Mitigation Philosophy

Chemical Injection Philosophy Metering Philosophy

Pigging Philosophy

Protection Philosophy

Installation Philosophy

Pre-commissioning/Commissioning Philosophy

Inspection, Maintenance and Repair (IMR) Philosophy

Future Tie-In Philosophy


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2030 Interface Engineering Rev :

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Objective

To establish subsea interfaces with other FEED disciplines (process, marine, etc.)


Establish areas where subsea equipment and facilities interface with other aspects of the project, for example, the FPSO,

process equipment and requirements, etc., and define the nature of the interface. Develop an interface Register defining responsibilities for the interface and data required.

Manage the interfaces through FEED to ensure that up-to-date information is included in the design.

Input Requirements

Review meetings with FPSO Design Team

Attendance at all-party workshops Attendance at Drilling Interface Management meetings


Interface Register Interface Definition Sheets


COMPANY’s FPSO contractor is likely to be located in the Far East The interface between Subsea and the FPSO Topsides is very significant, and the subsea FEED contractor and the FPSO

Design Team will need to be aware of this. In particular, the interface applies to CTR Nos. 1050, 2040, 2060, 4010,

4020F to 3020 H, 4020 M, 4060, 4110, 4120, 5110 and 6030


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2040 Future Expansion Rev :

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Objective

To establish the options for future expansion of the development and quantify level of pre-investment.


Investigate the options available for the subsea architecture for future tie-in of wells.

Define potential requirement for new wells and quantify level of pre-investment recommended

Input Requirements

Client sub-surface team


List of pre-investment CAPEX

Input to Future Tie-Back Philosophy (CTR 2020)

Pre-investment included in cost estimate



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2050 Materials Philosophy Rev :

Author :

Objective

To develop materials selection philosophy for the subsea production system, including manifolds, flowlines and risers.

To develop a Corrosion Management System Specification


Definition of potential materials for use within the subsea architecture selected for the development

Demonstration that the materials recommended will be compatible with those of adjacent components and foreseen operating conditions, and will comply with the system requirements as a whole.

Development of an overall Corrosion Management Specification for the subsea system

Input Requirements

Basis of Design


Input to Materials Philosophy document (CTR 2020)

Subsea Corrosion Management System Specification



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2060 System Definition and Optimisation Rev :

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Objective

To define the subsea system for the development as a basis for the remaining phases of FEED.


Development of preliminary system schematics (first draft P&IDs and field layout drawings), showing all main elements

of the subsea system, manifolds, flowlines risers, piping, valves, instruments, etc. Undertake a peer driven constructability/operability workshop, reviewing the arrangements from installation, operation

and maintenance viewpoints. Issue field architecture GA drawings and schematics as a basis for the remaining phases of FEED.

Input Requirements

Concept selection documentation and drawings.


Preliminary subsea system P&IDs

Field Layout drawings

Development schematics



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3010 Subsea Structure Piping Design Rev :

Author :

Objective

To develop preliminary designs for manifold and riser base (if required) pipework


Development of piping and equipment layouts for the subsea manifolds, PLETs and riser bases (if required), to include:

- All pipework required - Tie-in arrangements

- Remote connector type(s) - Valve requirements, actuation methods and interfaces for ROV intervention

- Controls instrumentation - Testing and commissioning requirements

From layouts, the development of a piping MTO and weight estimate for each structure as required.

Input Requirements

System definition and P&IDs

System philosophies


2D and 3D CAD drawings

Piping MTOs for all structures

Piping weight estimates for all structures



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3020 Subsea Structures Structural Design Rev :

Author :

Objective

To develop structural designs for manifolds, PLETs and riser bases (if required)


Development of manifold, PLET and riser base (if required) structural layouts, to meet the following criteria:

- Support and protection of the manifold/riser base piping and equipment - Any protection requirements

- Potential foundations design - Deployment and installation requirements

- ROV access to operate/override valves - ROV access to recover/change out key components

From the structural layouts developed, structural steel MTOs and weight estimates will be established for each structure.

Input Requirements

System definition and preliminary P&IDs

System philosophies


2D and 3D CAD drawings

Piping MTOs

Piping weight estimates



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3030 Subsea Structures Foundations Design Rev :

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Objective

To define the most suitable foundation system for the manifold, PLET and riser base (if required) structures.


Development of foundations designs for the subsea structures, including:

- Agree seabed soils data for the preliminary design - Select optimum foundations system (piles, suction piles, gravity base, etc.)

- Potential foundations design - Foundations deployment and installation requirements (if applicable)

- ROV access From the above develop a structural steel MTO and weight estimates for the foundations for each structure.

Input Requirements

Seabed soils information (desktop study or survey information)

Manifold structural and piping designs/layouts


Drawings

Technical note on foundations design for all structures

Foundations MTO and weight estimates for all structures



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4010 Flowline Route Selection Rev :

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Objective

To select routes for the infield flowlines required for the development.


A flowline routing study will be performed based on the available data. The routing study will take into consideration the

approaches at the FPSO and manifold ends of the flowlines as well as any known seabed features that will require routing around. In general, however, the shortest route possible will be selected.

The flowline routes will be used as a basis for the scope of work for the engineering route survey, will be used as the basis of Field Layout drawings and will provide input to the flow assurance studies (CTR 4020).

Flowline routing shall also take into account pipeline stability, the potential to ‘walk’ over steep inclines, etc, and avoid these as necessary

Input Requirements

Admiralty Chart(s) of he DWT area

Any Client supplied information on the area


Route Alignment Sheets

Technical note on route selection

Input to Scope of Work for engineering survey

Input to flow assurance studies



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4020A Flow Assurance; Fluids Characterisation Rev :

Author :

Objective

To undertake further fluids characterisation studies based on clean DST fluid samples


Analysis of available laboratory report data and selection of fluids for characterisation

Specification of fluid characterisation procedure Characterisation of fluids

Input Requirements

Fluid analysis reports


Update of fluid characterisation study report



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4020B Flow Assurance; Flow Assurance Simulation Basis Rev :

Author :

Objective

To develop a flow assurance simulation basis


Review of steady state and dynamic flow assurance work undertaken in pre-FEED

Specification of data requirements Collation of Data

Identify further data requirements Detail any assumptions made

Input Requirements

Existing available data


Flow Assurance Simulation Basis Report

Agreement with COMPANY as to the simulation basis


Note: there will be some uncertainty in design. Additional exploration and appraisal drilling in Q2 2011 will provide more data which may require/cause updates to some of the design cases, and then pre-FEED steady state and dynamic flow

assurance work may require reworking.


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4020C Flow Assurance; Steady State Analysis of Further Field

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Objective

To complete steady state PIPESIM analysis in the event that the current full field development is expanded.


Review of pre-FEED steady state analysis

Construction of appropriate PIPESIM models Undertaking the required simulation runs

Results analysis Production of steady state report

Input Requirements

Existing available data


Extended Steady State Simulation Report


Note: there will be some uncertainty in design. Additional exploration and appraisal drilling in Q2 2011 will provide more

data which may require/cause updates to some of the design cases, and then pre-FEED steady state and dynamic flow

assurance work may require reworking


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4020D Flow Assurance; Steady State Life of Field Analysis Rev :

Author :

Objective

To complete steady state PIPESIM analysis to confirm system performance through field life



Construction of appropriate PIPESIM models Development of fluid compositions

Undertaking the required simulation runs Results analysis

Production of Life of Field Report

Input Requirements

Agreed production rates at various stages through field life Assessment of water cut and gas leaning sensitivities – define appropriate fluids sensitivities


Confirmation of line sizing, thermal insulation, etc.

Steady State Life of Field Report


Note: there will be some uncertainty in design. Additional exploration and appraisal drilling in Q2 2011 will provide more data which may require/cause updates to some of the design cases, and then pre-FEED steady state and dynamic flow



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4020E Flow Assurance; Provision of Data for Life of Field

Corrosion Analysis

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Objective

To provide data for the analysis of corrosion over life of field



Extract appropriate data from the steady state life of field analysis to support life of field corrosion assessment (temperature, pressure, density and superficial velocity profiles)

Production of Report

Input Requirements

Agreed production rates at various stages through field life Assessment of water cut and gas leaning sensitivities – define appropriate fluids sensitivities


Report






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4020F Flow Assurance; OLGA Model Construction and Review Rev :

Author :

Objective

To design, construct, review and approve an OLGA model of the DWT system to allow accurate dynamic and transient

analysis


Review of pre-FEED dynamic flow assurance analysis Design and construct (or update existing model) an OLGA model of the system

Review the OLGA model

Input Requirements

Agreed subsea architecture Agreed well designs


Construction of a suitable OLGA model

Approval of model for use






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4020G Flow Assurance; Transient Operability and Design

Assessment

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Objective

To perform dynamic and transient analysis of the system to confirm its satisfactory operation


Specification of operating philosophies and sensitivities Definition of case matrices

Using OLGA model, investigate the following: Unstable flow and minimum hydraulic turndown; Artificial lift performance

(if required); Shutdown; Pipeline pressurisation (line packing); Settle out; Cooldown (no touch) and minimum thermal

turndown; Ramp up; Ramp down; Sphering and benefits of operational pigging; De-pressurisation; Well restart to

depressurised, pressurised and flowing systems; First gas start up; Typical start-up

Analysis of results

Final report

Input Requirements

Operations philosophy

Sensitivities


Report of Transient Operability and Design Assessment



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4020H Flow Assurance; Slugging Analysis Rev :

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Objective

To provide data on potential slug sizes for various potential riser sizes in various flow scenarios

Working in conjunction with the FPSO Design Team, determine the best compromise in terms of FPSO topsides capacity for managing slugs versus flowline size and wellhead back-pressures later in field life.


Extract liquid surge profiles from the OLGA runs of ramp up and pigging (if applicable) strategies. This is an iterative

process.

Data presentation in report form

Input Requirements

Appropriate OLGA runs


Final Report of Support Data for Slug sizes and recommendations for topsides equipment that is consistent with the FPSO Design Team conclusions.



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4020I Flow Assurance; Data to Support Flowline Design Rev :

Author :

Objective

In conjunction with CTRs 4040/J and 4020 K, to provide data in support of flowline design


Extract data from appropriate steady state and dynamic runs in support of flowline design, including, but not limited to: maximum and minimum steady state and transient wall temperatures; Operating pressure ranges; Full shut-in conditions

for each system


Input Requirements

Appropriate PIPESIM and OLGA runs


In conjunction with CTRs 4040/J and 4020 K, Report of Support Data for Flowline Design



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4020J Flow Assurance; Hydrate and Wax Management Studies Rev :

Author :

Objective

In conjunction with CTRs 4040/J and 4020 K, to specify and confirm hydrate and wax management strategies,

particularly under transient conditions


Additional OLGA runs as required to consider refined blowdown and liquids displacement strategies

Additional OLGA runs to track hydrate inhibition during restart and wax deposition


Input Requirements



In conjunction with CTRs 4040/J and 4020 K, Report of recommended hydrate and wax management strategies for the

development



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CTR FORM



CONTRACTOR:




4020K Flow Assurance; Hydrate Remediation Assessment Rev :

Author :

Objective

In conjunction with CTRs 4040/J and 4020 K, to size the venting system (if provided) for de-pressurisation on either side

of a hydrate blockage, and to develop an operating strategy for the system


Identification of cases for assessment

Construction of OLGA model(s)

OLGA runs

Results analysis

Case Refinement and report on hydrate remediation

Input Requirements



In conjunction with CTRs 4040/J and 4020 K, Report of recommended hydrate remediation strategy



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CTR FORM



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CTR FORM



CONTRACTOR:




4020L Flow Assurance; Chemical Core and Distribution Sizing Rev :

Author :

Objective

To confirm sizing of chemical injection cores in the subsea umbilicals and design of any subsea chemicals distribution

network


Construction of appropriate PIPESIM models

Development of fluid compositions

PIPESIM runs

Analysis of results

Report covering above work

Input Requirements

N/A


Report on chemical injection system

Input data for the specifications for subsea umbilicals and umbilical risers



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CTR FORM



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CTR FORM



CONTRACTOR:




4020M Flow Assurance; System Finalisation Rev :

Author :

Objective

To confirm system performance on completion of design activities


Finalised set of OLGA runs, simulating finalised chemical inhibition dosing and agreed flowline operating strategies. Runs will be required for: Steady state; ramp up; Ramp down; Pigging; Shutdown, settle out and cooldown; Pipeline

pressurisation; De-pressurisation; First gas and typical start up; Well restart; Hydrate remediation

Analysis of results

Report covering above work

Input Requirements

System design and operating philosophies


Report on finalised system analysis



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CTR FORM



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CONTRACTOR:




4030 Flowline Mechanical Design Rev :

Author :

Objective

To undertake flowline mechanical design


Mechanical design of the infield flowlines will be undertaken using verified software to confirm the following:

- Wall thickness - On-bottom stability

- External coating definition - CP requirements

- Anode design and attachment - Upheaval buckling analysis

- Trenching assessment (insulation)

Design shall be sufficient to allow procurement of linepipe in this phase of the development, if required.

Input Requirements

Preliminary flowline sizing (CTR 4020)

Basis of Design


Flowline Mechanical Design Reports for infield flowlines Drawings as appropriate



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CTR FORM



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CONTRACTOR:




4040 Flowline Coating Design Rev :

Author :

Objective

To define optimum external coating system(s) for the flowlines


Selection of the external coating system(s) for flowlines will be undertaken taking into account:

- Anti-corrosion - Stability

- Insulation requirements

Input Requirements

Flowline mechanical design (CTR 4030) Flow Assurance studies (CTR 4020)


Flowline Coating Selection Technical Report

Insulation Coating Selection Technical Note



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CTR FORM



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CTR FORM



CONTRACTOR:




4050 Flowline and Well Tie-Ins Rev :

Author :

Objective

To define systems for flowline and well tie-ins.


Survey available subsea remote flowline connection systems and select most appropriate for DWT development

Undertake system design for tie-ins between - Flowlines and manifolds

- Wells and manifold - Flowlines and riser bases (if required)

The stress analysis work for the spool tie-in design shall be based on a likely envelope, and the spool design shall be adequate to accommodate the potential locations for trees, manifolds and PLETs within that envelope

Input Requirements

Basis of Design


Subsea Remote Connection Systems Review Technical Note

Recommended remote connection system

Drawings of potential layouts for well tie-ins and for flowline tie-ins, including preliminary jumper/spoolpiece design.



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CTR FORM



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CONTRACTOR:




4060 Pigging Design Rev :

Author :

Objective

To design aspects of the flowline system to suit pre-commissioning and operational pigging requirements.


From the established pigging philosophy

- Ensure that piping design for the manifolds facilitates the installation, use and retrieval of a temporary subsea

PLR for all headers

- Ensure that all tie-in spoolpiece designs are suitable for the safe passage of all types of pig envisaged for use in

pre-commissioning and operational requirements - Ensure that all other aspects of the subsea flowline systems are suitable for envisaged pigging operations

- Interface with FPSO design to ensure that topsides PLR can be installed for pigging operations envisaged

Input Requirements

Basis of Design (CTR 2010)

Pigging Philosophy (CTR 2020)


Pigging Operations Technical Note

Preliminary pigging procedures Specification for subsea PLR

Input to design drawings of flowline system components



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CTR FORM



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CONTRACTOR:




4110 Riser System Selection Rev :

Author :

Objective

To define the optimal configuration for the DWT riser system


Survey available deep water riser systems, establish pros and cons for each system and select most appropriate system

for the DWT development on both technical and economic bases. Riser systems evaluated will include: - Flexible Risers

- Steel Catenary Risers - Multi-bore Hybrid risers

- Single Offset Hybrid Risers - Concentric Offset Hybrid Risers

Input Requirements

Basis of Design

Flow Assurance studies

Field Layout

Operations philosophy


Deep Water Riser Systems Review Technical Note

Recommended riser system



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CTR FORM



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CTR FORM



CONTRACTOR:




4120 Riser System Design Rev :

Author :

Objective

Design of the DWT riser system


Based on an appropriate riser system selection, the following design analysis work will be undertaken to define the riser

system - Configuration design, interfacing with the FPSO contractor for details on FPSO size, layout and RAOs.

- Stress analysis of the risers under expected loads induced by the expected FPSO motions, Metocean conditions and operational conditions.

- Anchor requirements at base of risers (to isolate the flowlines and/or to maintain configuration and limit transverse motions).

- Wall thickness definition.

- Preliminary fatigue analysis, including effects of VIV.

- Effects of insulation, if required.

- Flex-joint definition, if required

- Top end motions

Input Requirements

Basis of Design

FPSO layout/RAOs, etc.



Preliminary Riser Design Report



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CTR FORM



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CONTRACTOR:




5010 Chemical Injection Review and System Definition Rev :

Author :

Objective

Definition of the subsea components of the DWT chemical injection system


Review with process engineers the requirements for chemical injection into the DWT system, and the optimum locations

for such injection (e.g. at trees, flowlines or at manifolds, or combinations). Review possible methods for achieving the chemical injection required, i.e. subsea distribution, etc.

Input into manifold system design and system P&IDs

Input Requirements

Basis of Design Process studies



Information for use in the subsea control system and umbilical studies



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CTR FORM



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CONTRACTOR:




5110 Subsea Control System (SCS) Definition Rev :

Author :

Objective

Review and definition of the SCS


The subsea control system for the DWT development will be a multiplexed electrohydraulic system.

The DWT system philosophies (e.g. operations, availability, reliability, sparing, etc.) will be reviewed to assess the required performance criteria for the SCS.

The key components of the SCS will be reviewed and defined Review any new technology that may enhance the SCS or reduce its cost.

Develop a functional design specification for the SCS that will allow procurement to commence on completion of the FEED

phase of the project.

Input Requirements

Basis of Design

Field layout

P&IDs

Chemical Injection report


Subsea Control System Preliminary Design Report

SCS Functional Design Specification



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CTR FORM



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CONTRACTOR:




5210 Subsea Umbilical and Umbilical Riser Definition Rev :

Author :

Objective

Review and define requirements for the subsea umbilicals and umbilical riser(s)


Umbilical risers and seabed umbilicals will be required for subsea control, communications and chemical injection supplies to manifolds and trees.

Review and define requirements for: - Electrical power transmission

- Electrical or fibre optic signal transmission - Hydraulic fluid supplies (HP and LP)

- Injection chemical supplies

Compare the use of thermoplastic hose with steel tube cores to supply hydraulic fluids and chemicals for injection.

Consider construction with copper core cables for signal transmission or the use of fibre optic cores.

In collaboration with umbilical supplier(s):

- Establish optimum construction for the seabed umbilicals, complete with proposed cross section.

- Establish optimum construction for the dynamic umbilical risers, complete with proposed cross section, and also

the transition design between dynamic and seabed umbilicals.

- Determine any anchoring/buoyancy requirements for the dynamic umbilical riser section.

- Consider reducing the number of umbilical risers with distribution subsea.

Review any new technology that may enhance the umbilical system or reduce its cost.

Input Requirements

Basis of Design Field layout

P&IDs

Flow assurance studies (CTR 4020/L)


SCS Definition


Subsea Umbilical and Umbilical Riser Preliminary Design Report Umbilical and Umbilical Riser Specification

Umbilical and Umbilical Riser Data Sheets


CTR FORM



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CTR FORM



CONTRACTOR:




5310 Review of Multiphase Flowmeter Systems Rev :

Author :

Objective

Review and recommend subsea multiphase flowmeter systems.


Gather and collate data on each of the subsea multiphase flowmeter types available, and review their accuracy, reliability

and cost (CAPEX and OPEX), making technical contact with suppliers as required. Establish track record of use in each case.

Investigate and compare on technical and cost grounds the options to supply a meter and flow control valves at the manifold or to provide a meter per well.

Produce a Specification and data sheet for the recommended multiphase flowmeter

Input Requirements

Metering philosophy

Operating philosophy

Vendor information packs



Subsea Multiphase Flowmeter Review Technical Note Subsea Multiphase Flowmeter Specification

Subsea Multiphase Flowmeter Data Sheet



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CTR FORM



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CONTRACTOR:




5320 Review of Sand Detection Systems Rev :

Author :

Objective

Review and recommend subsea sand detection systems.


Gather and collate data on the sand detection systems available (both intrusive and non-intrusive to the production

system). Review and compare the systems, their accuracy, reliability and cost (CAPEX and OPEX), making technical contact with suppliers as required, and make recommendations for the DWT project.

Develop specification and data sheet for the recommended sand detection system

Input Requirements

Basis of Design Operating philosophy

Vendor information packs


Sand Detection Systems Review Technical Note

Sand Detector System Specification

Sand Detection System Data Sheet



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CTR FORM



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CONTRACTOR:




6010 Survey Specification and Scope of Work Rev :

Author :

Objective

To provide a Specification and Scope of Work for engineering survey of the DWT seabed for detailed design purposes.


For detailed design of the DWT subsea facilities to proceed it will be necessary to provide data as to the nature of the

seabed in the area to allow various engineering and design tasks to proceed. The survey specification shall include, but not be limited to:

- Applicable codes and standards - Mobilisation and acceptance trials

- Survey vessel requirements

- Survey equipment requirements

- Sampling and in-situ testing requirements

- Data collection and on-board processing

- Interpretation and charting

- Reporting and Documentation requirements

The survey scope of work will include, but may not be limited to, the following:

- Route survey for each infield flowline and umbilical corridor, specifying corridor route, expected termination

locations, survey width and number of passes, PCT test requirements and separation, etc.

- Boreholes to establish details of soils and soils strength for locations where seabed structures will be required,

i.e. the three manifold locations, any location where there may be a riser base or riser anchor.

- Requirements for survey for the FPSO will also be included from the FPSO contractor.

Input Requirements

Field layouts Expected locations for subsea structures and FPSO

Preliminary flowline routes


Survey Specification

Survey Scope of Work Survey Corridor Drawings


CTR FORM



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CONTRACTOR:




6020 Subsea System Functional Design Specification Rev :

Author :

Objective

To prepare a Functional Design Specification for the DWT subsea system


The purpose of the document will be to summarise all functional requirements for the subsea facilities based on the FEED

work completed, and to compliment the BOD. Cross reference will be made within this document to other key reports and specifications generated by the FEED study.

Input Requirements

BOD

Project philosophies Field layout drawings

Subsea P&IDs


Subsea System Functional Design Specification



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CTR FORM



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CONTRACTOR:




6030 Flowline and Flowline Related Procurement, Fabrication

and Installation Specifications

Rev :

Author :

Objective

To prepare a full suite of specifications for procurement, fabrication and installation of the subsea flowline and related

facilities for inclusion in the ITT for the next phase of the project.


Prepare Specifications covering the procurement, fabrication and installation of subsea flowlines and flowlines related equipment

Input Requirements

BOD

Project philosophies Field layout drawings

Subsea P&IDs

Materials selection

Etc.


Specifications covering Procurement, Fabrication and Installation of the Subsea FlowlineFacilities


Specifications for the flowlines and flowline related equipment required have been listed in the Scope of Work for the Subsea FEED. Depending on the FEED outcome, these may vary. Certain specifications are covered under specific

equipment CTRs.

CTR FORM



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CTR FORM



CONTRACTOR:




6040 Subsea Structures and Structure Related Procurement ,

Fabrication and Installation Specifications

Rev :

Author :

Objective

To prepare functional specifications for the subsea manifolds, PLETs and riser bases (if required) for tenderers for the

next phase of the project


Prepare Specifications covering the procurement, fabrication and installation of subsea manifolds, PLETs and riser bases (if required) and any structure related related equipment

Input Requirements

BOD

Project philosophies Subsea P&IDs

Manifold 2D and 3D drawings

Pipework schematics

MTOs


Manifold Design Specification


Specifications for the subsea structures and structure related equipment required have been listed in the Scope of Work for the Subsea FEED. The functional specification for the manifold(s), PLETs and riser bases (if required) will be prepared

in conjunction with the 2D and 3D CAD drawings, the MTOs and pipework schematics developed in FEED. Certain Specifications (e.g. structure fabrication) will cover all structures.

CTR FORM



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CONTRACTOR:




6110 Scopes of Work for EPC/EPIC/Installation Contracts Rev :

Author :

Objective

To provide assistance as necessary to determine a contracting strategy for the next phase of the project.

To prepare Scopes of Work for the enquiry packages for the contracts to be let for the next phase of the work.


Assistance will be provided as necessary to develop a contracting strategy for the project, for example, EPC, EPIC, EPCIC or installation.

As a result of the decision on contracting strategy, Scopes of Work will be developed for each of the contracts that will be tendered. These Scopes of Work will be taken forward, together with other technical deliverables developed during FEED,

into The ITT packages.

Input Requirements

Contracting strategy Subsea system architecture details


Scopes of Work for ITT packages



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CTR FORM



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CTR FORM



CONTRACTOR:




7010 Subsea Support to HSE - General Rev :

Author :

Objective

Subsea contributions to project HSE in general


Assistance will be provided as necessary for the following:

- Contractual obligations for HSE - Safety Engineering Design Philosophy

- Project HSE Plan - Project Safety Register

- Development and Upkeep of Safety Action Management System (SAMS)

Input Requirements


Report on HSE obligations Philosophy documents

Project HSE Plan

Project Safety Register

SAMS



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CTR FORM



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CTR FORM



CONTRACTOR:




7020 Safety Engineering Rev :

Author :

Objective

Subsea contributions to project safety engineering tasks


Assistance/attendance will be provided as necessary for the following:

- Formal HAZID Workshop - Formal HAZOP Workshop

- Loss control design - Hazardous material inventory

-

Input Requirements


HAZID Report

HAZOP Report

HAZOP Action List Responses

Design Report

Hazardous Materials List



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CTR FORM



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CTR FORM



CONTRACTOR:




7030 Environmental Engineering Rev :

Author :

Objective

Subsea contributions to project environmental engineering tasks


Assistance/attendance will be provided as necessary for the following:

- Environmental studies - Formal ENVID Workshop

- Environmental protection philosophy - Environmental emissions and discharges estimations and database

Input Requirements


Environmental study technical note

ENVID report

Philosophy document

Emissions/Discharges database



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CTR FORM



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