Project Management in the Oil and Gas Industry

Table 5.1 Example for foundation.
Item Activity
Time (days)
Precedence activity
100
Mobilization
3
–
200
Excavation
8
100
300
Pouring concrete foundation and 
piping support
10
200,100
400
Install the piping
4
300,100
500
Install the mechanical package
1
300
600
Put the grouting 
1
300, 500
700
Connect the piping
5
400,500
800
Commissioning and start up
2
700

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Resource Hiring 159
itself and the overall time. An activity can move through itself without 
affecting the overall time for the project and it is presented in the table 
by the total floating time (TF). The column of the resources shows the 
number of personnel required for each activity per day, while the last 
column shows the total number of days required for each activity. For 
example, in Table 5.2 excavation needs seven workers per day and work 
will last for eight days, so this activity needs 56 working days in order 
to be achieved.
Figure 5.6 Preceding diagram define the critical path.
100
600
200
400
3
7
14
18
7
12
18
23
0
3
0
3
3
11
3
11
11
21
11
21
21
22
21
22
22
23
22
23
23
25
23
25
300
500
700
800
Pouring concrete
Excavate
Install piping
Mech. package
Put grouting
Conn. piping
3
1
8
4
10