1.introduction to pl - · pdf file01.04.2012 · introduction references 1. s.c....
TRANSCRIPT
IntroductionIntroductionIntroductionIntroductionReferences1 S C Sharma Plant Layout and Material1. S.C. Sharma, Plant Layout and Material
Handling.
2. Richard L. Francis, Facility Layout and Location.y y
3. Chandrashekar Hiregoudar, etal. Facility Planning
and Layout Design.
4. Dr-Ing. Daniel Kitaw, Industrial Management and
Engineering Economy.
OUTLINEOUTLINE Company profile
Definitions
Plant Location
o Site Selectiono Site Selection
o Theories of Industrial Location
o Location Economics
o Selecting Plant in Urban/Rural Areas
o Site Selection Process
OUTLINE-cont’dOUTLINE-cont’d
Objective of a good plant
Principles of plant layout
Basic types of plant layout Basic types of plant layout
Plant Layout at Belayab Enterprise Plant Layout at Belayab Enterprise
The head quarter and showroom is located at Nefas SilkLafto Sub City, Addis Ababa.
The Enterprise has well established maintenance workshop. The Enterprise has well established maintenance workshop. The car assembly launches production of different types
of vehicles. ZHENGZHOU NISSAN PICK UP DOUBLE CAB 4WD ZHENGZHOU NISSAN, PICK UP DOUBLE CAB, 4WD FOTON - Mini Dump Truck FOTON - Heavy Duty Tractor Unit FOTON Heavy Duty Dump Truck FOTON - Heavy Duty Dump Truck FOTON - Light Duty Truck Forlan Van
l FOTON Water Sprinkler, etc.
Plant Layout at Belayab Enterprise Plant Layout at Belayab Enterprise
Spare part store• Products are not arranged properlyg p p y• No detailed inventory of stored items and locations.
Plant Layout at Belayab Enterprise Plant Layout at Belayab Enterprise
Show Room• Not shown from the outside.
P kParking Area• Not enough to serve customers
Assembly AreaPlant Layout at Belayab Enterprise Plant Layout at Belayab Enterprise
Assembly Area• Tools and equipment are not available in the area.• Parts can be damaged due to environmental causes.Parts can be damaged due to environmental causes.
Painting Area• Don’t have proper area and equipment.p p q p
Plant Layout at Belayab Enterprise Plant Layout at Belayab Enterprise
Tool Room and Engine house
Plant Layout at Belayab Enterprise Plant Layout at Belayab Enterprise
Waste and Scraps are not properly managedp p p y m g
Definitions Definitions
A plant is a place
Where men, materials, money, equipment,
machinery, etc. are brought together for
manufacturing productsmanufacturing products.
CONT’D CONT’D
Plant location means deciding a suitable
location, area, place, etc. where the plant or
f t ill t t f ti ifactory will start functioning.
CONT’D CONT’D
Plant layout means the disposition of the
various facilities (equipments, materials,
t ) d i f th l tmanpower, etc.) and services of the plant
within the area of the site selected.
CONT’DCONT’D
Problems of layout develop when needed:
• To start a new product,p
• To change the product design,
• To reduce the cost;
And when
• The market demand changes,m m g ,
• The plant, the product, the building become obsolete,
• Accidents occur frequently,Accidents occur frequently,
• The working environment is poor.
Plant LocationPlant Location
Choice of general area or region.
Choice of site within the area selected.
CONT’D CONT’D
Location decision is based on the organizations long-
term strategies such as technological marketingterm strategies such as technological, marketing,
resource availability and financial strategies.
Plant location is important because:
• Location influences plant layout facilities needed• Location influences plant layout facilities needed.
• Location influences capital investment and operating
costs.
CONT’D CONT’D
Need for location decision: When a new facility to be established When a new facility to be established.
Expansion of existing facility.
To establish additional facilities in new territories due to To establish additional facilities in new territories due togrowing volume of business.
When original advantage of the plant have been out weighed When original advantage of the plant have been out weigheddue to new development.
When new economics social legal or political factors suggest When new economics, social, legal or political factors suggesta change of location of the existing facility.
CONT’D CONT’D
Plant location plays a major role in the design
of a production system as it determine the
cost of:cost of:
Getting suitable raw materials;
Processing raw material to finished goods; and
Finished products distribution to customers Finished products distribution to customers.
Site Selection Site Selection
The problem of the selection of a factory or a
plant can be solved in the following two stages:
a) The General Location of the Planta) The General Location of the Plant
b) The Selection of a Particular site.
CONT’D CONT’D
a) General Location of the plant Availability of Raw Materials Availability of Water
l b l f l Proximity to Markets
Transport Facility
Availability of Efficient and
Availability of Capital
Social and RecreationalFacilities Availability of Efficient and
Cheap Labour
Availability of Power and Fuel
Business and CommercialFacilities
Climatic and AtmosphericConditions
Existence of relatedIndustries
Other factors …f
CONT’D CONT’D
b) Specific Site Selection Community Attitudey
Community Facilities
Topographyp g p y
Transportation Facilities
Waste Disposalp
Ecology and Pollution
Size of Land
Supporting Industries
Theories of Industrial LocationTheories of Industrial Location All are emphasize on the search for suitable location which offers the greatest
difference between total costs and total revenue.
Some important theories on industrial location are:p
Theory of Maximum Profit Location
Location Analogue Model
The Interdependence Theory of Location The Interdependence Theory of Location
Theory of Least-Cost Location
Linear Programming Techniques
Weber’s Theory of Location
Theory of Location by Sargent
Theory of Location by Predohl and others
Theory of Location by Losch and Walter Israd
CONT’D CONT’D Theory of Maximum Profit Location
Location of manufacturing establishment depends up on L f m uf u g m p up
the firms cost of production at alternative locations in the
m k t A L hmarket area. – Argus Losch
Suggested a mathematical model which considers total
cost, total revenues, the sales radius and the maximizing
net mill price. Considers variations in income betweennet m ll pr ce. ons ders var at ons n ncome between
alternative locations.-Green hut
CONT’D CONT’D
The Interdependence Theory of Location
Plant location should be based on the ability of a site Plant location should be based on the ability of a site
to control the largest market area. – Fettler and
Hotelling
Assumed that the cost of procuring raw materials
and processing are equal at all locations.p g q
L P h
CONT’D CONT’D Linear Programming Techniques
Provides a means of finding optimum solution to practical problems.
It b d i it ti h it i i d t i i It can be used in a situation where it is required to maximize orminimize some quantity which is a function of a set of variables,subjected to certain rules or constraints.j
Used for solving plant location problem such as:
a) The location of single firm.
b) Inter regional commodity flows and the allocation ofproduction.
c) The dual and location rent.
d) Transportation of incoming and distribution of final products.
Location Economics Location Economics
For evaluation of economical location following factors should be
considered:
) R la) Raw material procurement
b) Proximity to market
c) Availability of labour
d) Availability of powerFixed cost
e) Availability of finance
f) Miscellaneous considerations (donations, subsidies, taxes and non-
f b l l b d d l linterference by government or local bodies, war and political
effects and other facilities or bottlenecks)
CONT’D CONT’D
The principle of industrial plant location is
that the sum of manufacturing andthat the sum of manufacturing and
distributing cost should be at minimum for
the best location.
) f l d k h l
CONT’D CONT’D a) Factors for locating an undertaking near the raw material
size:
Wh n s f m t i ls is th nt llin f t• When source of raw materials is the controlling factor,
• When materials are bulky and of relatively low price,
Wh n m t i ls sm ll nd f hi h nit p i• When materials are small and of high unit price,
• When raw materials are greatly reduced in bulk duringthe process of manufacturingthe process of manufacturing,
• When raw materials are perishable and process makesthem less perishable.them less perishable.
CONT’D CONT’D
b) Factors for locating an industry near tomarket:market:
• When the size or bulk of the product isp
more,
• Render it more fragile,
More susception about the spoilage• More susception about the spoilage.
CONT’D CONT’D
c) Factors related to the economy of labour:
• The ratio of labour cost to the total• The ratio of labour cost to the totalmanufacturing cost,
• Possibility of reduction in labour cost byusing better method or better quality ofusing better method or better quality oflabour,
• The type of labour required.
CONT’D CONT’D
d) Economy and availability of power
) Oth m j f t th t infl n s ise) Other major factor that influences is
availability of financey
f) Miscellaneous considerations
Location Alternatives Location Alternatives Various costs and other considerations have been listed below as
regards to locations 1 and 2. Its required to determine the over all best
location
Total Cost-1= 8,219,500 BirrTotal Cost-2= 8,432,000 BirrTotal Cost-1= 8,219,500 BirrTotal Cost-2= 8,432,000 Birr
location.
Costs ofLocation-1(Birr)
Location-2(Birr)
a) Land 1,100,000 1,000,000
Costs ofLocation-1(Birr)
Location-2(Birr)
h) Raw Material and th li
1,450,000 1,400,000)
b) Building 3,500,000 3,800,000
c) Water 9,500 12,000
other suppliesi) Taxes 400,000 300,000
j) Community Facilities
Good Excellent d) Power 500,000 800,000
e) Labour 600,000 500,000
f) Freight
Facilitiesk) Community
attitudeAlright Encouraging
l) Housing facilities Very good Goodf) F g• In-coming• Out-going
230,000310,000
220,000300,000
g) Fuel 120,000 100,000
) g f y g
m) Cost of Living High Normal
n) Community Size Small Medium
F th F ll i D t l t th t d t l ti f
Location AlternativesLocation Alternatives From the Following Data select the most advantageous location for
setting a plant for making Aluminum Extrusion Plant
C fLebuBi
AkakiBi i
SulultaBi i f
LebuB
AkakiB
SulultaB Costs of Birr
in mlnBirr in mln
Birr in mln
a) Total initial investment 9 9 9
Costs of Birr in mln
Birr in mln
Birr in mln
f) Wage and Salaries 0.35 0.3 0.5
Total Sales Total Expense X 100b) Total
expected sales for the period
4.5 5 4.5g) Other
expenses 0.4 0.3 0.4
h) Community attitude Good Excellent Alright
R.O.R = Total Sales- Total Expense X 100Total Investment
R O R for Lebu = 17 2% pc) Distribution
expense 0.4 0.4 0.6
d) Raw materialxp ns 1.5 1.0 2.0
attitude g
i) Employeehousing facilities
Alright Alright Poor
R.O.R for Lebu = 17.2%
R.O.R for Akaki = 30%expense
e) Power and Water supply expenses
0.3 0.3 0.5
TotalExpense 2.95 2.3 4R.O.R for Sululta = 5.6%
Economic Factors Economic Factors
a) Product - Nature, Volume, value.
b) Production process – continuous intermittentb) Production process – continuous, intermittent.
c) Manufacturing machinery
d) Services – Electricity, Water, Sewerage, steam, air.
Ad tSelecting the plant site in city(Urban site)Selecting the plant site in city(Urban site)
Advantages• A city is very well connected by rails, roads and air.
• It provides a good market also.
• Right labour force is available.
P d W t i il il bl• Power and Water is easily available.
• It has good hospitals, marketing centers, Schools, Banks, etc.
• The factory can be setup in an existing available buildingsThe factory can be setup in an existing available buildings.
• Workers training classes and many other educational facilities can be cites.
• Services of experts and specialist are easily available.p p y
• Many other small industries are existing
• Security
CONT’DCONT’D
Disadvantages• Land available for the building is limited in areag
• Cost of land and building construction is high
• Expansion of the industry is seldom possible• Expansion of the industry is seldom possible
• Local taxes, etc … are high
b l h h• Labour salaries are high
Selecting the plant site in a small town (Rural area)Selecting the plant site in a small town (Rural area)
Advantages
• Plenty of land is available for building construction
and expansion purposesp p p
• Land is cheap
• Cheap labour force
• Government gives incentivesGovernment gives incentives
• Less tax and restriction
CONT’DCONT’D
DisadvantagesSkill d l b i t il bl• Skilled labour is not available
• Rail, road and air links may not be there at all or
may not be adequate
Power is not available• Power is not available
Site Selection ProcessSite Selection Process
The following procedures are recommended:
1. Formulate the problem1. Formulate the problem
2. Analyze the problem
3. Search for alternative solutions
4 Evaluate the design alternatives4. Evaluate the design alternatives
5. Select the preferred design
6. Specify the solution
OBJECTIVES OF A GOOD PLANTOBJECTIVES OF A GOOD PLANT
• Ensure effective space utilization,• Minimize the cost of material handling (internalMinimize the cost of material handling (internal
transports),• Foresee future developments of the plant accordingForesee future developments of the plant according
to a rational master plan,• Improve workers convenience as well as safety and• Improve workers convenience as well as safety and
create job satisfaction, and• Avoid unnecessary capital investment• Avoid unnecessary capital investment.
PRODUCT DESIGN CHANGE
NEW PRODUCT
MARKET DEMAND
H NGE
OBSOLETE FACILITIES
POOR WORKER EN R
MARKET RELOCATION
COST REDUCTION
Development stimulating layout problem
CHANGE CHANGE ENVIR.
BUILD NEW PLANT
MOVE TO EXISTING
PLANT
REARRANGE EXISTING LAYOUT
MINOR CHANGES
Classes of layout problemCause and result occur frequentlyCause and result occur less frequentlyCause and result occur occasionallyCause and result occur very seldom
PRINCIPLES OF A GOOD PLANT LAYOUTPRINCIPLES OF A GOOD PLANT LAYOUT
• Overall integration of factorsMi i t• Minimum movement
• Uni-directional• Effective use of available space
M i i ibilit• Maximum visibility• Maximum accessibility
TYPES OF LAYOUTTYPES OF LAYOUT
• From the point of view of plant layout, we canl if b i i i hclassify business or units into three
categories:g
1. Manufacturing units
2. Traders
3 Service Establishments3. Service Establishments
CONT’DCONT’D
Manufacturing unitsIn case of manufacturing unit plant layout may be ofIn case of manufacturing unit, plant layout may be offour types:
a) Product or line layout
b) Process or functional layoutb) Process or functional layout
c) Fixed position or location layout
d) Combined or group layout
CONT’DCONT’D
Product or line layout• In this type of layout, only one product or one
type of product is produced in a given areatype of product is produced in a given area.
• The product must be standardized andmanufactured in large quantities in order tojustify the product layoutjustify the product layout.
CONT’DCONT’D
• The raw material moves veryfast from one workstation toother stations with a minimumwork in progress storage andwork in progress storage andmaterial handling.
Paper millPaper mill
bamboos are fed into the machine d d at one end and paper comes out
at the other end.
CONT’DCONT’D
The grouping of machines should be done keeping in mind the
following general principles:
a) All the machine tools or other items of equipments must be
placed at the point demanded by the sequence of operations
b) There should no points where one line crossed another line.
c) Materials may be fed where they are required for assemblyc) Materials may be fed where they are required for assembly
but not necessarily at one point.
d) All the operations including assembly testing packing must bed) All the operations including assembly, testing, packing must be
included in the line
CONT’DCONT’D
Mill Grind InspectProduct A Department
1 32 4 5 76Press Heat treat Paint Pack
Mat
erials
d Go
od
ore
1 32 4 5 76Grind Drill Inspect
P k
Raw
M
Finish
eSt
o
Cast Mill Paint PackProduct B Department
CONT’DCONT’D
• Specialized equipment
• High capital intensity & wide use of automation
• Processing rates are fasterg
• Material handling costs are lower
• Less space required for inventories
• Less volume or design flexibilitym g f y
f h d f d l
CONT’DCONT’D
Some of the advantages of product layout are:• lower total material handling cost,• lower total production time,• less work in process,• greater incentive for groups of workers to raise level
of performance,• less floor area required per unit of production and• greater simplicity of production control, fewer
l d d d d lcontrol records needed and lower accounting cost.
Some of the disadvantages of product layout are:
CONT’DCONT’D
Some of the disadvantages of product layout are:
• High initial capital investment in special purpose
machine
• Heavy overhead charges• Heavy overhead charges
• Breakdown of one machine will hamper the whole
production process
• Lesser flexibility as specially laid out for particular• Lesser flexibility as specially laid out for particular
product.
CONT’DCONT’D
Product Layout is useful under the following conditions
• Mass production of standardized productsp p
• Simple and repetitive manufacturing process
O ti ti f diff t ss is l ss l• Operation time for different process is more or less equal
• Reasonably stable demand for the product
• Continuous supply of materials
• Minimum of inspection is required during sequence ofMinimum of inspection is required during sequence of
operations,
CONT’DCONT’D
Process or Functional Layouty• Similar equipment and similar operations are grouped
t th i th f ti l l ttogether in the process or functional layout.
• It is particularly useful where low volume is required.p y q
CONT’DCONT’D
The grouping of machines according to the process has tobe done keeping in mind the following principles
• The distance between departments should be as shortas possible for avoiding long distance movement ofp g gmaterials
• The departments should be in sequence of operations• The departments should be in sequence of operations
• The arrangement should be convenient for inspectionand supervision
CONT’DCONT’D
Tailoring, light and heavy engineering products,
made to order furniture industries.
CONT’DCONT’D
2 4 6s tore
Foundry Dept. Drilling Dept. Grinding Dept. Brazing Dept. Inspection Dept.
14
2
5
5
3
67
w mat
erial
d Go
od s
t
6531
3 872
Raw
Finish
e
Press Dept. Heat treat Dept. Painting Dept. Milling Dept. Packing Dept.
Product A
Product B
CONT’DCONT’D
Some of the Advantages of Process Layout are:• less duplication of equipment, hence lower investment cost,
fl ibili f d i• greater flexibility of production,• better and more efficient supervision,
greater incentive for individual workers to raise level of• greater incentive for individual workers to raise level ofperformance,
• better control of complicated or precision processes,better control of complicated or precision processes,• Breakdown of one machine does not result in complete work
stoppage• Change in output design and volume can be more easily adapted
to the output of variety of products
S f h Di d f P L
CONT’DCONT’D
Some of the Disadvantages of Process Layout are:
• Material handling costs are high due to backtracking
• More skilled labour is required resulting in higher cost.
• Time gap or lag in production is higher• Time gap or lag in production is higher
• Work in progress inventory is high needing greater
storage space
• More frequent inspection is needed which results in
costly supervision
CONT’DCONT’D
Process Layout is useful under the following conditions
• Products are not standardizedProducts are not standardized
• Quantity produced is small
• There are frequent changes in design and style of
productp
• Job shop type of work is done
• Machines are very expensive
Fixed Position Layout
CONT’DCONT’D
Fixed-Position Layout• In this type of layout, the material or major component
remains in a fixed location, and tools, machinery, men aswell as other pieces of material are brought to thislocation.
• Typical examples are ship building, constructionyp p p gindustries, aircraft building and bench work exercises.
• This type of layout is not frequently used in industrialThis type of layout is not frequently used in industrialenterprises.
Some of the Advantages of Fixed Position Layout are:
CONT’DCONT’D
Some of the Advantages of Fixed Position Layout are:
• It saves time and cost involved on the movement of work from
one work station to another.
• The layout is flexible as change in job design and operation
sequence can be easily incorporated.
• It is more economical when several orders in different stages of
progress are being executed simultaneously.
• Adjustments can be made to meet shortage of materials orj g
absence of workers by changing the sequence of operations.
S f h Di d f Fi d P i i L
CONT’DCONT’D
Some of the Disadvantages of Fixed Position Layout are:
• Production period being very long, capital investment is
very heavy
• Very large space is required for storage of material andVery large space is required for storage of material and
equipment near the product.
A l ti ft i d t• As several operations are often carried out
simultaneously, there is possibility of confusion and
conflicts among different workgroups.
CONT’DCONT’D
Fixed Position Layout is useful under the followingconditions
• Manufacture of bulky and heavy products such aslocomotives ships boilers generators aircraftlocomotives, ships, boilers, generators, aircraftmanufacturing, etc.
• Construction of building, dams, etc.
• Hospital, the medicines, doctors and nurses aretaken to the patient (product).
Combination Layout
CONT’DCONT’DCombination Layout
• Certain manufacturing units may require all three processes
namely intermittent process (job shops), the continuous process(mass production shops) and the representative process
combined process [i.e. miscellaneous shops].
• Combination of the product and process layout or other
combination are found, in practice, e.g. for industries involving
the fabrication of parts and assembly, fabrication tends to
employ the process layout, while the assembly areas often
employ the product layout.
TRADERSTRADERS
• When two outlets carry almost same merchandise,customers usually buy in the one that is more appealing tothem.
• Thus, customers are attracted and kept by good layout, p y g yi.e. good lighting, attractive colors, good ventilation, airconditioning, modern design and arrangement and evencon t on ng, mo rn s gn an arrang m nt an nmusic.
• All of these things mean customer convenience customer• All of these things mean customer convenience, customerappeal and greater business volume.
• The customer is always impressed by serviceCONT’DCONT’D
The customer is always impressed by service,
efficiency and quality.
• There are three kinds of layouts in retail operations
todaytoday.
1. Self service or modified self service layout
2. Full service layout
3 S i l l t3. Special layouts
S i bli h h B k I M l
SERVICES CENTERS AND ESTABLISHMENTSERVICES CENTERS AND ESTABLISHMENT
• Services establishments such as Banks, Insurance, Motels,
Hotels, Restaurants, must give due attention to client
convenience, quality of service, efficiency in delivering
services and pleasing office ambience.
• In today’s environment, the clients look for ease in
approaching different departments of a serviceapproaching different departments of a service
organization and hence the layout should be designed in a
fashion which allows clients quick and convenient access tofashion, which allows clients quick and convenient access to
the facilities offered by a service establishment.
STUDY OF PLANT LAYOUT STUDY OF PLANT LAYOUT
• The solution of any size and type of plant layout
p bl ms ld b f ilit t d b sin s st m tiproblems could be facilitated by using a systematicand logical approach.
• An early pioneer in this area was Richard Muther,
developer of the Systematic Layout Planning (SLP)developer of the Systematic Layout Planning (SLP)methodology.
Th SLP d l d h l h h
CONT’DCONT’D
The SLP procedure leads the planner through
• Abstraction (Analysis): Gathering appropriatey pp pinformation and analyzing the flow of materials andthe activity relationships to form a relationshipthe activity relationships to form a relationshipdiagram.
S id ti h bi d ith th• Space considerations when combined with therelationship diagram develop the space relationshipdiagram.
S h (f ibl l ti ) Th ll l t i
CONT’DCONT’D
• Search (for possible solution): The overall layout isdesigned by combining space consideration with therelationship diagram.
• The search phase is the phase in which alternativep playouts are developed by examining the spacerelationship diagram under modifying considerationrelationship diagram under modifying considerationsuch as materials handling, storage facilities, site
diti d di b ildi t lconditions and surroundings, building types, personnelconvenience, etc., and practical limitations.
CONT’DCONT’D
• Selection: The most efficient general method of
lu tin l ut lt n ti s is t m d f tevaluating layout alternatives is termed factor
analysis. It follows the engineering concept of
breaking down the problem into its elements and
analyzing each oneanalyzing each one.