class 12 - maintenance scheduling

7/30/2019 Class 12 - Maintenance Scheduling

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Scheduling

Is the process by which jobs are matched withresources and sequenced to be executed at acertain points in time.

Scheduling deals with the specific time and phasing ofplanned jobs together with the orders to perform the work,

monitoring the work, controlling it, and reporting on jobprogress.

Successful planning needs a feedback from scheduling.

MaintenanceScheduling

Scheduling

Techniques

Example

Industrial Engineering


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Scheduling

Reliable Schedule Must Take into Consideration:

A job priority ranking reflecting the criticality of thejob.

The availability of all materials needed for the workorder in the plant.

The production master schedule.

Realistic estimates and what is likely to happen.

Flexibility in the schedule


Scheduling

Techniques

Example



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Scheduling

Priorities of maintenance work


Scheduling

Techniques

Example



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Scheduling

Failure Modes and Effects Analysis (FMEA)

FMEA is an engineering technique used to define,identify, and eliminate known and/or potentialfailures, problems errors, and so on from the system,design, process, and or service before they reachthe customer.

The FMEA is also used to rank & prioritize the

possible causes of failures as well as develop andimplement preventative actions, with responsiblepersons assigned to carry out these actions

Continuous improvement is the force that drivesFMEA

Prioritizes the identified failure modes according tothe risk priority number


Scheduling

Techniques

Example



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Scheduling

FMEA

(RPN = Frequency x Severity x Detection)

Occurrence is the frequency of the failure

Severity is the seriousness (effects) of the failure

Detection is the ability to detect the failure before itreaches the customer


Scheduling

Techniques

Example



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Scheduling

Maintenance Schedule Can be Prepared atThree Levels (Depend on The Time Horizon) :

Long-range (master) schedule

Weekly schedule

Daily schedule


Scheduling

Techniques

Example



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Scheduling

Long-Range (master) Schedule :

Covering a period of 3 months to 1 year.

Based on existing maintenance work orders (blanketwork order, backlog, PM, anticipated EM).

Balancing long-term demand for maintenance workwith available resources.

Spare parts and material could be identified andordered in advance.

Subject to revision and updating to reflect changes in

the plans and maintenance work.


Scheduling

Techniques

Example



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Scheduling

Weekly Schedule :

Covering 1 week. Generated from the master schedule.

Takes into account current operations schedules andeconomic considerations.

Allow 10% to 15% of the workforce to be available foremergency work.

The schedule prepared for the current week and thefollowing one in order to consider the available backlog.

The work orders scheduled in this week are sequenced

based in priority. CPM and integer programming techniques can be used

to generate a schedule


Scheduling

Techniques

Example



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Scheduling

Daily Schedule

Covering 1 day.

Generated from weekly schedule.

Prepared the day before.

Interrupted to perform EM.

Priorities are used to schedule the jobs


Scheduling

Techniques

Example



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Scheduling

Elements of Effective Scheduling

Written work orders that are derived from a well-conceived planning process. (Work to be done,methods to be followed, crafts needed, spare partsneeded, and priority).

Time standards.

Information about craft availability for each shift.

Stocks of spare parts and information on restocking


Scheduling

Techniques

Example



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Scheduling

Elements of Effective Scheduling ..continue..

Information on the availability of special equipment andtools necessary for maintenance work.

Access to the plant production schedule and knowledgeabout when the facilities will be available for service

without interrupting production schedule.

Well-define priorities for maintenance work.

Information about jobs already scheduled that arebehind the schedule (backlog)


Scheduling

Techniques

Example



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Scheduling

Scheduling Procedures (Steps)

Sort backlog work orders by crafts.

Arrange orders by priority.

Compile a list of completed and carry over jobs.

Consider job duration, location, travel distance, and thepossibility of combining jobs in the same area.

Schedule multi-craft jobs to start at the beginning ofevery shift.

Issue a daily schedule (not for shutdown maintenance).

Authorize a supervisor to make work assignments(dispatching).


Scheduling

Techniques

Example



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Maintenance Job Priority System

Priorities are established to ensure that the most criticalwork is scheduled first.

It is developed under coordination with operations staff.

It should be dynamic.

It must be updated periodically to reflect changes inoperation and maintenance strategies.

It typically includes three to ten levels of priority.


Scheduling

Techniques

Example



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Scheduling Techniques

The objective of the scheduling techniques is toconstruct a time chart showing:

The start and finish for each job.

The interdependencies among jobs.

The critical jobs that require special attention andeffective monitoring.


SchedulingTechniques

Example



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Scheduling Techniques

Such techniques include:

Gantt chart

CPM

PERT

Integer and stochastic programming.



Example



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Example

Maintenance

Scheduling


Example


Gantt Chart

class 12 - maintenance scheduling

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