Algorithms for Plant LayoutCORELAP

(Computerized Relationship Layout Planning)

Presented by: Zohaib Rasheed

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CORELAPAcronym for Computerized Relationship Layout

Planning

Uses Relationship Chart as input (REL)

Requires users to assign weights to the alphabetic ratings in the REL chart . (Closeness Ratings)

Computes the total closeness ratings (TCR) for each department by summing all the CR associated with that department.

Values selected for ratings are important

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CORELAP ……………………[cont]User interface in CORELAP is spreadsheetInputs through Microsoft FormsTo obtain layout followings are required to

give as input:Number of departmentsRelationship weightsNote: weights should be assigned in

decreasing order[A, E, I, O, U & X]

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Importance of Closeness

Value

A

E

I

O

U

X

ClosenessLinecode

Numericalweights

Absolutely necessary

Especially important

Important

Ordinary closeness OK

Unimportant

Undesirable

32

26

8

4

2

-32

4

Relationship Chart Example

5

1 PresidentO

2 Costing UA A

3 Engineering IO

4 President’s Secretary

1 PresidentO

2 Costing UA A

3 Engineering IO

4 President’s Secretary

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3

4

Ordinary closeness: President (1) & costing (2)

Absolutely necessary: President (1) & secretary (4)

I = Important; U = Unimportant

CORELAP - STEPS

1. Selection Procedure

2. Placement and Evaluation Procedure

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CORELAP – STEP 1First department:

Second department: X-relation “last placed department”A-relation with first. If none E-relation with

first, etcetera

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iiTCRmax

CORELAP – STEP 2Department areas are converted into grid

squares.CORELAP does not take the building shape

into account. The final shape of the facility created by

CORELAP depends on the placement of departments it has selected.

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CORELAP – STEP 2Place the first department in the center of

the layoutSubsequent department is placed abutting

already placed departments in the position that gives the best placement rating

After the layout is completed CORELAP calculates a numerical score for the layout

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dCR iji ij

ijeLayoutScor

CORELAP – STEP 2

10

1st

8

1

2 3

7 6

5

4

2nd