What does RCM stand for? What are RCM principles? How it can be implemented, and where?
<p>On what reasons, a heat exchanger could be rejected especially shell and tube type H.E.?</p>
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<p>on what pressure , a heat exchanger could be hydro tested?</p>
RCM is Function Oriented—RCM seeks to preserve system or equipment function, not just operability for operability's sake. Redundancy of function, through multiple pieces of equipment, improves functional reliability but increases life-cycle cost in terms of procurement and operating costs.
RCM is System Focused—RCM is more concerned with maintaining system function than with individual component function.
RCM is Reliability Centered—RCM treats failure statistics in an actuarial manner. The relationship between operating age and the failures experienced is important. RCM is not overly concerned with simple failure rate; it seeks to know the conditional probability of failure at specific ages (the probability that failure will occur in each given operating age bracket).
RCM Acknowledges Design Limitations—RCM objective is to maintain the inherent reliability of the equipment design, recognizing that changes in inherent reliability are the province of design rather than of maintenance. Maintenance can, at best, only achieve and maintain the level of reliability for equipment that was provided for by design. However, RCM recognizes that maintenance feedback can improve on the original design. In addition, RCM recognizes that a difference often exists between the perceived design life and the intrinsic or actual design life and addresses this through the Age Exploration (AE) process.
RCM is Driven by Safety, Security, and Economics—Safetyandsecuritymust be ensured at any cost; thereafter,cost-effectivenessbecomes the criterion.
RCM Defines Failure as "Any Unsatisfactory Condition"—Therefore, failure may be either a loss offunction(operation ceases) or a loss of acceptable quality (operation continues but impacts quality).
RCM Uses a Logic Tree to Screen Maintenance Tasks—This provides a consistent approach to the maintenance of all kinds of equipment.
RCM Tasks Must Be Applicable—The tasks must address the failure mode and consider the failure mode characteristics.
RCM Tasks Must Be Effective—The tasks must reduce the probability of failure and be cost-effective.
RCM Acknowledges Three Types of Maintenance Tasks—These tasks are time-directed (PM), condition-directed (CM), and failure finding (one of several aspects of Proactive Maintenance). Time-directed tasks are scheduled when appropriate. Condition-directed tasks are performed when conditions indicate they are needed. Failure-finding tasks detect hidden functions that have failed without giving evidence of pending failure. Additionally, performing no maintenance, Run-to-Failure, is a conscious decision and is acceptable for some equipment.
RCM is a Living System—RCM gathers data from the results achieved and feeds this data back to improve design and future maintenance. This feedback is an important part of the Proactive Maintenance element of the RCM program.
