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  • 1. Scheduling ofRepetitive Projects Repetitive Projects SchedulingLinear Projects Repetitive uniform of work (multiple houses, …) Geometrically linear (pipeline, highways,…) Some non typical units may exist Projects assumed to be comprised of n typical units Complex to schedule and monitor 04/11/2006 Emad Elbeltagi 2 1
  • 2. Repetitive Projects SchedulingDuration-driven Vs Resource-driven Schedule Duration-driven schedule Basic units: activities, durations, relationships Resources are functions of activities durations Resources are assumed to be available Resource-driven schedule More focus on resources Meeting a deadline Line of balance (LOB) Summary diagrams04/11/2006 Emad Elbeltagi 3 Repetitive Projects SchedulingLine of Balance (LOB) Meet deadline date Focus on resources04/11/2006 Emad Elbeltagi 4 2
  • 3. Repetitive Projects SchedulingLine of Balance (LOB) One Activity & 3 Crews Site 5 Crew 2 4 Crew 1 3 Crew 3 2 Crew 2 1 Crew 1 0 1 2 3 TimeHow Many Crews Needed to Meet Deadline ? 04/11/2006 Emad Elbeltagi 5 Repetitive Projects SchedulingLine of Balance (LOB) 04/11/2006 Emad Elbeltagi 6 3
  • 4. Repetitive Projects Scheduling Line of Balance (LOB) 04/11/2006 Emad Elbeltagi 7 Repetitive Projects Scheduling Line of Balance (LOB)Sites Diff. Durations Parallel Crews Stagg. Crews987654321 04/11/2006 Emad Elbeltagi Time 8 4
  • 5. Repetitive Projects SchedulingLine of Balance Calculations Crew synchronization and work continuity equation Computation of project delivery rate to meets a deadline Calculating resource needs Drawing the LOB schedule04/11/2006 Emad Elbeltagi 9 Repetitive Projects SchedulingLine of Balance Calculations Crew synchronization and work continuity equation Computation of project delivery rate to meets a deadline Calculating resource needs Drawing the LOB schedule04/11/2006 Emad Elbeltagi 10 5
  • 6. Repetitive Projects SchedulingLine of Balance Calculations (work continuity) R=C/D C=DxR Unit 5 4 Crew 1 3 Crew 3 2 Crew 2 C Crews 1 R Crew 1 0 1 2 3 D Time04/11/2006 Emad Elbeltagi 11 Repetitive Projects SchedulingLine of Balance Calculations (work continuity) R = 1 / (D / C) C=DxR Unit Crew 3 3 2 Crew 2 1 1 R Crew 1 Time R 0 1 2 3 D/C D/C D/C04/11/2006 Emad Elbeltagi 12 6
  • 7. Repetitive Projects SchedulingLine of Balance Calculations (Meeting a deadline) Units n . . . n-1 2 R Time 1 T1 = CPM Duration of Unit 1 TL = Project Deadline Duration R = (n – 1) / (TL - T1)04/11/2006 Emad Elbeltagi 13 Repetitive Projects SchedulingLine of Balance Calculations (Meeting a deadline) TF = 3 D (2) A (5) B (5) C (5) Unit n A D D C n-1 B (TL - T1 ) + TFD Unit 1 TL - T1 A (5) B (5) C (5) D (2) TF = 3 R = (n – 1) / (TL - T1) + TF04/11/2006 Emad Elbeltagi 14 7
  • 8. Repetitive Projects SchedulingLine of Balance Calculations (work continuity) Draw the CPM for one unit and determine activities floats; TFi Calculate CPM duration for one unit; T1 Calculate Ri = (n-1) / (TL - T1) + TFi Calculating Number of crews needed Ci = Ri x Di Calculate actual number of crews Cai = Round up Ci Then calculate actual delivery rates Rai = Cai / Di04/11/2006 Emad Elbeltagi 15 Repetitive Projects SchedulingLine of Balance Calculations (Example) A 5 Kilometer pipeline project The activities involved in one Kilometer is given below Project deadline 30 days Assume 2 days buffer time between activities Activity Duration Activity name Preceding activities no. (days) 1 Locate and clear 1 - 2 Excavate 3 1 3 String pipe 1 1 4 Lay pipe 4 2,3 5 Pressure test 1 4 6 Backfill 2 504/11/2006 Emad Elbeltagi 16 8
  • 9. Repetitive Projects Scheduling Line of Balance Calculations (Example) 0 1 3 6 8 12 14 15 17 19 -2 2 (3) -2 4 (4) -2 5 (1) -2 6 (2) 1 (1) 0 1 3 6 8 12 14 15 17 19 -2 -2 3 4 3 (1) 5 6 T1 = 19 days TL= 30 days N = 5 units Ri = (n-1) / TL - T1 + TFi = 4 / (11 + TFi) 04/11/2006 Emad Elbeltagi 17 Repetitive Projects Scheduling Line of Balance Calculations (Example) Duration Total Ri = Cai =Activity Ci =Di x Ri Rai = Cai / Di Di Float 4 / (11+TFi) Round up Ci 1 1 0 0.364 0.364 1 1 2 3 0 0.364 1.092 2 0.667 3 1 2 0.308 0.308 1 1 4 4 0 0.364 1.456 2 0.5 5 1 0 0.364 0.364 1 1 6 2 0 0.364 0.728 1 0.5 04/11/2006 Emad Elbeltagi 18 9
  • 10. Repetitive Projects SchedulingLine of Balance Calculations (Example) Activity 1: D= 1 day; R = 1 unit/day; Horizontal projection = n-1 / R = 4/1= 4No. ofunits 4 5 7 8 9 12 16 20 22 23 29 31 5 1 3 2 4 5 6 1 Time 0 1 3 4 6 8 12 18 19 21 2304/11/2006 Emad Elbeltagi 19 10