Production Operations and Management[1]
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School
University of Illinois, Springfield *
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Course
521A
Subject
Industrial Engineering
Date
Dec 6, 2023
Type
docx
Pages
7
Uploaded by ElderValorMule43
Production and Operations Management
Module 2 HW-1
Submitted by
Group 2
1
Akhila Vydugula
2
Shreya Vishwas
3
Bhavana Yadav Krishnappa
4
Sohan Shylaja Mohan
Shale Oil Case Study
Network diagrams are used by the project management technique PERT (Program Evaluation and Review
Technique) to predict the amount of time needed for project tasks. The PERT (Program Evaluation and Review Technique) 4-way technique using AON (Activity-on-Node) entails a structured study of project activities and dependencies. It consists of the following key elements:
Define Activities and Sequence.
Determine Activity Durations and Time Estimates.
Create Project Network Using AON.
Determine Critical Path and Slack.
Let’s calculate Expected time and variance using the below formulas:
T exp = (a+4m+b)/6
Variance=[(b-a)/6] 2
No
.
Activity
Optimisti
c Most Likely(m
)
Pessimistic(b
)
Predecessor
Expecte
d time
Varianc
e
1
Circulate wash water throughout unit
1
2
2.5
-
1.9
0.06
2
Install blinds
1.5
2
2.5
1
2.0
0.03
3
Open and clean
vessels and columns
2
3
4
2
3.0
0.11
4
Open and clean
heat exchangers; remove tube bundles
1
2
3
2
2.0
0.11
5
Open and clean
1
2
4
2
2.2
0.25
furnaces
6
Open and clean
mechanical equipment
2
2.5
3
2
2.5
0.03
7
Inspect instrumentatio
n
2
4
5
2
3.8
0.25
8
Inspect vessels and columns
1
2
3
3
2.0
0.11
9
Inspect
heat-exchanger
shells
1
1.5
2
4
1.5
0.03
10
Inspect tube bundles
1
1.5
2
4
1.5
0.03
11
Inspect furnaces
2
2.5
3
5
2.5
0.03
12
Retube furnaces
15
20
30
5
20.8
6.25
13
Inspect mechanical equipment
1
1.5
2
6
1.5
0.03
14
Install new pump mechanical seals
3
5
8
6
5.2
0.69
15
Repair instrumentatio
n
3
8
15
7
8.3
4.00
16
Repair vessels and columns
14
21
28
8
21.0
5.44
17
Repair
heat-exchanger
shells
1
5
10
9
5.2
2.25
18
Repair tube bundles; retube
2
5
10
10
5.3
1.78
19
Repair furnaces
5
10
20
11
10.8
6.25
20
Repair mechanical equipment
10
15
25
13
15.8
6.25
21
Test and close vessels and columns
4
5
8
16
5.3
0.44
22
Install tube bundles into heat-exchanger
shells
1
2
3
18
2.0
0.11
23
Test and close 1
2
2.5
17, 22
1.9
0.06
heat exchangers
24
Test and close furnaces
1
2
3
12, 19
2.0
0.11
25
Test and close mechanical equipment
1
2
3
14, 20
2.0
0.11
26
Test instrumentatio
n
2
4
6
15
4.0
0.44
27
Pull blinds
1.5
2
2.5
21,23,24,25,2
6
2.0
0.03
28
Purge all
equipment with steam
1
3
5
27
3.0
0.44
29
Start up unit
3
5
10
28
5.5
1.36
147.5
1)
Draw the project network using AON method
.
5) List all critical activities. What percentage of all activities are critical.
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