MAINTENANCE ENGINEERING & MANAGEMENT

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SCHEDULING TECHNIQUES

➢ The number above each box in Figure refers to the
amount of a critical resource used (usually time).

➢ All events in the Critical Path Chart must be completed
before the project is considered complete.

➢ The Critical Path is the path that uses the most resources
(like time).

➢ If an event along the critical path consumes more than the
scheduled amount of resources, the whole delivery date of
the project is delayed.

➢ The Critical Path Chart helps a project manager focus
attention and resources on the path that consumes the
largest amount of resources to complete a project.

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❑ A PERT chart (as in Figure) presents a graphic illustration
of a project as a network diagram consisting of numbered
nodes (either circles or rectangles) representing events, or
milestones in the project linked by labelled vectors
(directional lines) representing tasks in the project.

❑ The direction of the arrows on the lines indicates the
sequence of tasks. In the diagram, for example, the tasks
between nodes 1, 2, 4, 8, and 10 must be completed in
sequence. These are called dependent or serial tasks.

❑ The tasks between nodes 1 and 2, and nodes 1 and 3 are
not dependent on the completion of one to start the other
and can be undertaken simultaneously.

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• Stochastic programming is a framework for modeling

optimization problems that involve uncertainty. Whereas

deterministic optimization problems are formulated with

known parameters, real world problems almost invariably

• include some unknown parameters.
When the parameters are known only within certain

bounds, one approach to tackling such problems is called

robust optimization. Here the goal is to find a solution

which is feasible for all such data and optimal in some

sense.

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MAINTENANCE INVENTORY

The inventory is a list of physical features (area,
material, etc.) of capital assets that require
maintenance.
Many maintenance organizations, materials account for
one-third to one-half of the operating budget, and more
in some capital-intensive industrial sectors.

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Advantages of Maintenance Inventory:

◼ Clear and frequent communication among maintenance,
inventory management, and purchasing departments

◼ A customer service orientation by inventory management
and purchasing departments

◼ Active material planning by maintenance, inventory
management, and purchasing departments

◼ Efficient material flow from the storehouse to the customer
site

◼ Effective physical control of parts
◼ Enhanced item accuracy

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TYPES OF INVENTORY

(i) raw materials inventory
- items are purchased from suppliers for use in
production processes.

(ii) finished goods inventory
- concerned with finished product items not yet delivered
to customers.

(iii) supplies inventory
- concerned with parts/materials used to support the
production process.

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(iv) work-in-process (WIP) inventory
- concerned with partly-finished items (i.e., components,
parts, subassemblies, etc.) that have been started in
the production process but must be processed further.

(v) transportation inventory
- concerned with items being shipped from suppliers or to
customers through the distribution channel.

(vi) replacement parts inventory
- concerned with maintaining items for the replacement
of other items in the company or its customer
equipment/systems as they wear out.

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(i) Items/materials to be stored
Decisions require consideration of factors such as ability
of the vendor to supply at the moment of need, cost, and
the degree of deterioration in storage.

(ii) Amount of items/materials to be stored
Decisions are made by considering factors such as
degree of usage and delivery lead time.

(iii) Item/material suppliers
Decisions on suppliers of items/materials are made by
considering factors such as price, delivery, quality, and
service.

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(iv) Lowest supply levels
Decisions on lowest levels of supplies, in particular the
major store items, are made by considering factors such
as purchasing’s historical records and projected needs.

(v) Highest supply levels
As time-to-time supply usage rate drops, the decisions on
the highest supply levels are made by keeping in mind
factors such as past ordering experience and peak
vacation period.

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(vi) Time to buy and pay
Decisions on these two items are often interlocked. Such
decisions are made by considering factors such as
vendor announcements about special discounts, past
purchasing records, and store withdrawals and
equipment repair histories.

(vii) Place to keep items/materials
As location control is crucial to a productive.
Maintenance department, decisions concerning storage
of items/materials are made by keeping in mind that
they can be effectively retrieved. Past experience
indicates that a single physical location for each item is
the best.

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(viii) Appropriate price to pay
Pricing is of continuous concern, and decisions
concerning it are primarily governed by perceived, not
actual, supply and demand.

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CREATE THE PM SCHEDULE FOR CNC LATHE
MACHINE

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CREATE THE PM SCHEDULE FOR MILLING
MACHINE

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INTRODUCTION

• IS A COMPUTER SOFTWARE PROGRAM DESINED TO ASSIST IN THE PLANNING, MANAGEMENT AND

ADMISISTRATIVE FUNCTIONS REQUIRED FOR EFFECTIVE MAINTENANCE.

• IT IS USED AS A MEANS TO ENSURE THE HIGH QUALITY OF BOTH EQUIPMENT CONDITION AND OUTPUT.

DEFINITION

• ENTERPRISE ASSET MANAGEMENT (EAM)
• COMPUTERIZED MAINTENANCE MANAGEMENT INFORMATION SYSTEM (CMMIS)
• INTEGRATED INFORMATION MANAGEMENT SYSTEM (IIMS)

• THE BASIC FUNCTION IS TO MAINTAIN A COMPUTERDATABASE OF INFORMATION ABOUT AN

ORGANIZATION’S MAINTENANCE OPERATIONS.



i. Asset
ii. Preventive Maintenance
iii. Labor
iv. Work Order System
v. Schedulling / planning
vi. Vendor
vii. Inventory Control
viii. Purchasing
ix. Budgeting
x. Integrated report writer

benefits

PC-based Web-
based

Is design to help maintenance workers
Mange their maintenance more effective by
being able to see all information about an
asset in one location

CMMS

FINANCIAL
BUDJET COST

HUMAN
RESOURCES
MANAGEMENT

COST ANALYSIS CORRECTIVE MAINTENANCE WORK ORDER

equipment employee
CMMS PRO

supplier inventory

BREAK DOWN ANALYSIS





SUB-SYSTEM OR BRANCHES

CMMS is a set of integrated software programs, data files and tables that provide functionality for a
number of activities.

These sub-systems includes:-
a) Equipment or asset input and maintenance
b) Equipment or asset total of material input and maintenance
c) Equipment or asset work order and maintenance history
d) Inventory management
e) Preventive maintenance development, maintenance and scheduling
f) Work order planning, work order scheduling, execution and completion
g) Human resource/ manpower/ craftsman skills
h) Purchasing and receiving including invoice matching and accounts payable to
i) Integrated report and summary

MASTER FILES

Common CMMS provides storage, manipulation and retrieval of the following types of information and
characterize as master file based on the sub-system

a) Equipment or asset
b) Inventory
c) Types of maintenance and scheduling
d) Work order/ manpower/ human resource/ craft skills
e) Cost/report

a well planned and executed CMMS project can yield a max ROI realized through
increased efficiency, productivity and profits.

However, many CMMS projects fail to reach their potential. Here, some of the

factors;-

Not having
management
support for tEhmepClMoyMese turnoEvmerployee

resistanWcreo3nthgesCelMeJMuctsSitoifnaydoinvfagnbcaeBsdeeidngonlocked into
functionarelistiterisc.tive harLdawcakroef adequate
/ softwaret.raining duLaricnkgor absence of
implementatifoonll.ow uNpoatnhdaving adequate
monitosriunpgplier support for
the cmms

BASIC CMMS
TRAINING

CMMS ESTABLISH A EXTERNAL
IMPLEMENTATION TEAM

FORM A TEAM PROJECT
LEADER
MANAGEMENT
COMMITMENT WORK FLOW
WHICH MODULES
PREPARE FOR WHICH EQUIPMENT
CHANGE WHICH PART
INTERFACING
ORDER SOFTWARE / OVERALL TIME
HARDWARE

SCOPE OF PROJECT

PLANNING

INSTALLATION & CONFIGURATION * IN HOUSE
BASIC CMMS TRAINING * TEMPORARY HELP
INTERNAL TRAINING * OUTSIDE
DATA GATHERING CONTRACTOR
DATA ENTRY
ADVANCED TRAINING * ASSIGN MAN
FOLLOW UP / MONITOR * DEVELOP
FOLLOW UP / MONITOR * GO LIVE

CMMS IMPLEMENTATION

PREDICTIVE EQUIPMENT HISTORY
MAINTENANCE
WORK ORDER REBUILD
PREVENTIVE
MAINTENANCE STORES /
INVENTORY
LABOR PURCASING

INSPECTION
PREVENTIVE MAINTENANCE

PREDICTIVE TESTING & INSPECTION

GROUNDS CARE

PROGRAMMED MAINTENANCE

REPAIR

REPLACEMENT OF OBSOLETEITEMS
TROUBLE CALLS

SERVICE REQUEST

CENTREL UTILITIY PLANT OPERATIONS & MAINTENANCE

WORK
RECEPTION

WORK
IDENTIFICATION

WORK
CLASSIFICATION



WORK SCHEDULING WORK WORK ACCEPTANCE
PERFORMANCE
MATERIAL METRICS, ANALYSIS
MANAGEMENT & REPORTING

1, UTALIZE ELECTRONIC DEVICE WHERE POSSIBLE. 2.TRACKING UTILIES FEEDBACK FROM EACH STAGE OF WORKFLOW

DOCUMENT EQUIPMENT DATA & HISTORY, TRACK TIME & INVENTORY, COST OF LABOR, PARTS AND SERVICES.

MAINTENANCE
REQUEST (MRO)

etc

JOB
PRIORITIZATION

JOB PLANNING

PREVENTIVE MAINTENANCE JOB
(PM) JOBS AUTOMATICALLY SCHEDULLING

GENERATED BASED ON
MAINTENANCE STRATEGIES

AND

BREAKDOWN JOB EXECUTION
MAINTENANCE & HISTORY
COLLECTION

PERFORMANCE
MANAGEMENT

e ISBN 978-967-2097-51-8