MAR2012 Build Strategy

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Build Strategy

Engineering application

By: H.Enshaei

Module leader: Paul Stott

[email protected]

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)


Module Mar-2012Semester-2


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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)


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.


Block plan



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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.


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


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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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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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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Documents

MAR2012 Build Strategy