Maintenance Engineering

Conventions 1. The symbol derived by the name of the scientist is in upper case letters e.g. Voltage – V, Ampere –A, Power – W, Newton – N, Energy-J ( Joule), Charge – Q (Coulomb), Capacitance – F (Farad), Inductance – H (Henry), Conductance – S(Siemens), Magnetic Flux Density – T (Tesla), Thermodynamic Temperature – K […]

Development of designs for higher life, improved energy efficiency, less maintenance and user-friendly operation and handling is the most important desirable engineering function. As soon is product comes out of the factory duly tested and installed at the purchaser’s premises, the responsibility for its long life, as stated by the manufacture in its product guidelines, […]

Threaded fasteners are widely used for joining two or more components by form fit or friction fit. Designing a fastener is very important and requires Selection of fastener: Selection involves size, standards, material and property class Positioning of fastener: Locating a fastener, accessibility, tensile/shear/compressibility forces, spring rate of joint etc. Determination of tightening torque: Tightening torque […]

Manufacturers and operators employ array of maintenance strategies, all of which can be broadly categorized as below: Corrective Maintenance Preventive Maintenance Predictive Maintenance Corrective maintenance is the classic Run-to-Failure reactive maintenance that has no special maintenance plan in place. The machine is assumed to be fit unless proven otherwise. Cons: High risk of collateral damage […]

Condition based maintenance, as the name implies, means monitoring and measuring the condition at intervals and decide upon maintenance action as per the condition so evaluated. Thus, the condition based maintenance, also called directed maintenance, differs from preventive maintenance in which the equipment is opened at fixed interval irrespective of its condition. Indian Railways have followed preventive […]

A large number of products of Indian Railway work in very harsh environmental condition. Environmental conditions like dust, moisture, chemical pollutants, rain etc. create natural cleaning need and can be addressed with little effort. But the problem is aggravated due to external factors prevailing all over Indian Railways such as Poor infrastructure for disposal of garbage which lies on the track […]

 Measurement and analysis drives initiative, innovation, development, lateral thinking. Statistical tools help in analyzing   measurements in many ways. Maintenance relevant Statistical Tools Failure Rate Percent Per Year (FRPCPY) Bench Marking ABC Analysis Pareto chart Bath Tub Statistical Analysis ( Mean, Mode, Median and Standard Deviation )  Failure Rate Percent Per Year (FRPCPY) This is a […]

It is due to standardization of the system in Railways that train operates over the length and breadth of the country with safety, security and punctuality. It is the language of similarity and uniformity Define Standardization “Formulation, publication, and implementation of guidelines and rules, specification for common and repeated use, the optimum degree of order or uniformity in a given context, discipline or […]

Concept of Material Management for maintenance is different as compared to manufacturing activity. Need of material during maintenance is towards wear & tear, aging and damages and lubricants etc. What material and how much is the essence of material management. With addition of new technologies, different makes and trend of failures makes the material management dynamic which is […]

Once an asset is designed and manufactured and delivered to provide service, the reliability issues get centered towards maintenance. Maintenance now has to play an important role towards reliability. But how? Monitor and record the performance of the asset at intervals to be decided based on the critical application. Look for any abnormal signs Interact […]