- Usually well-defined scope, from:
- permits, memos, etc.
- Scope is static. Few changes occur during execution.
- Can be planned and scheduled well in advance of the project.
- Projects are organized around cost codes / commodities.
- Generally do not require safety permits to perform work.
- Manpower staffing requirements usually do not change during project execution.
- Project schedules can be updated either weekly or monthly.
- Projects measure time in days, weeks and months.
- Project scope is usually all mandatory.
- Project schedules are uncompressed. Schedule acceleration can be used to correct slippages in the critical path.
- Usually loosely defined scope, from:
- past turnaround experience
- inspection reports
- operations requests
- historical estimates
- Scope is dynamic. Many changes occur as inspections are made.
- Planning and scheduling cannot be finalized until the scope is approved, generally near the shutdown date.
- Turnarounds are work order based.
- Turnaround work requires extensive permitting every shift.
- Manpower staffing requirements change during execution due to scope fluctuations (from discovery work).
- Turnaround schedules must be updated every shift, daily.
- Turnarounds measure time in hours or shifts.
- Turnaround scope is flexible. Usually a large percentage of work can be postponed to a later window of opportunity if necessary.
- Turnaround schedules are compressed. There may be little or no opportunity to correct the critical path by accelerating the schedule.