OM0015 - Maintenance Management

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ASSIGNMENT

DRIVE	SPRING 2014
SUBJECT CODE & NAME	OM 0015 - Maintenance Management
SEMESTER	4
BK ID
CREDITS	4
MARKS	60

Note: Answer all questions. Kindly note that answers for 10 marks questions should be approximately of 400 words. Each question is followed by evaluation scheme.

Q.1 Write short notes on:

a. Quality versus maintenance

b. Mean Time to Repair (MTTR)

c. Fault tree analysis

d. Systematic equipment replacement program

Ans : a.  Quality versus maintenance :

Good quality maintenance contributes significantly to quality assurance. Poor maintenance of machines may lead to erratic working of certain parts leading to costly failures. Erratic working, say for example, an aggregate of the machine running with heavy vibrations has the direct effect of premature wear, breakage of cutting tool, etc. The product produced from such a machine will have bad surface finish, resulting in rejections.

b. Mean Time to Repair (MTTR) :

Mean Time To Repair (MTTR) is a basic measure of the maintainability of repairable items. It represents the average time required to repair a failed component or device. Expressed mathematically, it is the total corrective maintenance time divided by the total number of corrective maintenance actions during a given

c. Fault tree analysis :

Fault tree analysis (FTA) is a top down, deductive failure analysis in which an undesired state of a system is analyzed using Boolean logic to combine a series of lower-level events. This analysis method is mainly used in the fields of safety engineering and reliability engineering to understand how systems can fail, to identify the best ways to reduce risk or to determine (or get a feeling for) event rates of a safety accident or a

d. Systematic equipment replacement program :

The primary goal of maintenance is to avoid or mitigate the consequences of failure of equipment. This may be by preventing the failure before it actually occurs which Planned Maintenance and Condition Based Maintenance help

Q.2 Evaluate the relationships between degree of maintenance and various costs from the graph given below:

Ans:  Degree of maintenance and economic cost :

The economic cost of a decision depends on both the cost of the alternative chosen and the benefit that the best alternative would have provided if chosen. Economic cost differs from accounting cost because it includes opportunity cost. As an example, consider the economic cost of attending college. The accounting cost of attending college includes tuition, room and board, books, food, and other incidental expenditures while there. The opportunity cost of college also includes the salary or wage that otherwise could be earned

Q. 3 Explain Condition Based Maintenance(CBM) .

Ans : Explanation :

Condition-based maintenance (CBM), shortly described, is maintenance when need arises. This maintenance is performed after one or more indicators show that equipment is going to fail or that equipment performance is deteriorating. This concept is applicable to mission critical systems that incorporate active redundancy and fault reporting. It is also applicable to non-mission critical systems that lack redundancy and fault

Q.4 Write short notes on:

• Costs associated with inventory control of spare parts
• Problems in maintenance scheduling
• Universal maintenance standards
• Asset life cycle management

Ans : Costs associated with inventory control of spare parts :

Inventory control of spare parts is essential to many organizations, since excess inventory leads to high holding costs and stock outs can have a great impact on operations performance. This paper compares different re-order point

Problems in maintenance scheduling :

The problem of scheduling o-line preventive maintenance of power generating units is of substantial interest to the electric power industry. A typical power plant consists of one or two dozen power generating units which can be individually scheduled for preventive maintenance. Both the required duration of each unit's maintenance and a

Universal maintenance standards :

Comparative Estimating is a work measurement technique which can be used for setting time standards on low repetitive tasks, such as may be met with in the maintenance area. It has been in wide use since 1955 and has probably been more commonly known as Universal Maintenance Standards (UMS). Since its introduction, the

Asset life cycle management :

Improve equipment reliability and plant utilization with new tools that offer real-time collaboration and adaptive procedures. Transform your organization from fragmented and reactive to demand-driven and predictive.

Q.5 Explain the steps to autonomous maintenance.

Ans : Listing the steps to autonomous maintenance :

Step 1 : Conduct initial cleaning and inspection

Step 2 : Eliminate sources of contamination and inaccessible areas.

Step 3:Develop and test

Q. 6 Explain pillar 1 (autonomous maintenance -JH) of TPM implementation.

Ans : Explanation of the term autonomous maintenance :

The principal way in which the production department participates in TPM is through

autonomous maintenance- cleaning, inspection, and simple adjustments performed by operators

systematically trained through a step-by-

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