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P repetitive

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P repetitive

  1. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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

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