MAR2012 Build Strategy
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Transcript of MAR2012 Build Strategy
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Build Strategy
Engineering application
By: H.Enshaei
Module leader: Paul Stott
Module Mar-2012
Semester-2
EngineeringApplication
mailto:[email protected]:[email protected] -
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What is build strategy?
An agreed plan for:
design
technical information
material management
production testing
It is prepared before work starts, to identify and integrate all
processes.
It is a formal, agreed, signed document, which gives statement ofcompany intent, and which may not be amended without
formal, agreed, signed permission. (Diagram)
EngineeringApplication
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What is build strategy?
A Build Strategy is the application of a shipyard manufacturing
strategy to an individual contract.
Series of objectives which are satisfied by a Build Strategy:
to ensure that the manufacturing strategy is applied to ensure that all departments contribute to planning the project
to ensure that the design takes production requirements into account
to create opportunities to reduce the work content
to identify and use suitable interim products
to determine resource loadings and skills requirements
to identify any shortfalls in capacity of facilities or labour to plan design, purchasing as well as production activities
to provide a basis for all planning and project management
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Build strategy contents.
Typical contents are:
Outline Specification of the Vessel
Unusual technical features of the Vessel
Contractual dates and constraints Design and technical information
Purchasing
Work Breakdown
Planning
Quality Assurance
Tests and trials
Human resources
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Preliminary determination of
block plan
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Block plan
How Will the Ship Be Produced?
Breakdown of the final product into interim products
Decisions on the processes to be used
Decisions on the design detail to support production
It can be regarded as modelling the production process prior to
production.
EVOLVING INTO A MANUFACTURING STRATEGY
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In preliminary manner basic design needs to:
Define simple, logical block boundaries, (Drawing)
Define blocks of maximum size and weight permitted by the
shipyards assembly and erection processes and facilities,
Minimize the number of blocks, if necessary by joining blockswhich are sized to facilitate assembly into grand blocks in
order to exploit a large capacity crane at an erection site,
Minimize scaffolding, lifting, turnovers, etc, (Figure)
Identify blocks which can be used as patterns for other blocks
in parallel midbody.(Figure)
Module Mar-2012Semester-2
Block plan
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Besides this, block predefinition should consider
how to:
Install machinery and fit other components in the engine
room,(Figure)
Arrange deck machinery, mooring fittings, etc, Perform as much painting as possible before hull erection.
Module Mar-2012Semester-2
Block plan
EngineeringApplication
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How will the block be produced?
Total process is divided into component parts. (Figure)
The system by which these components are subdivided in orderto control the process is called:
Work Breakdown Structure.
Module Mar-2012Semester-2
Work breakdown Structure
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Initial Drawings
General arrangement
Midship section
Engine room arrangement
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Detailed calculation of parallel midbody
EngineeringApplication
Item No. Unit6
Cuttingtime(hr)
Firingtime(hr)
Weldingtime(hr)
Flat Plate:
Bottom
shell
5 30 30 15 XXX
Longitudinal stiffeners:
Tank
top
12 72 36 XXX XXX
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Detailed calculation of parallel midbody
EngineeringApplication
Hours/week 35
Performance factor 0.5
Program weeks 4
Tot.times of proce m.wks Perf. m.prog.wks
Plate cutting 259 7.4 14.8 3,7
Profile cutting
Sub asm. fairing
Unit fairing 81 2.3 4.6 1.2
Sub asm. welding
Block welding
Total XXX XXX
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Detailed calculation of parallel midbody
EngineeringApplication
Item Length
Width thickness
density weight
Bottom plate XXX XXX XXX XXX XXX
Transverse
side frame
XXX XXX XXX XXX XXX
Total XXX
Weight calculation
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15Module Mar-2012Semester-2 Return