Quality Monitoring

Quality Monitoring
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Quality Monitoring

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Publisher: Laxmi Publications
ISBN: 9789381159071
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PREFACE The book titled Quality Monitoring has been written for the students of B.E. B. Tech and M.Sc. in Environment Management of various Indian universities. The content of the book is divided into three chapters. The book entails the following features The presentation of the subject matter is very systematic. Language of the text is lucid and easy to understand. The whole text is practical based. Though every effort has been made to ensure the correctness of text, the author would be grateful to hear from any reader who discovers possible errors and inadequacies. Constructive suggestions for the improvement of the text would be mostly welcomed. Author
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FOREWORD In the manufacturing industries many instruments are used for quality monitoring, which are essentially supposed to be much better than the conventional monitoring instruments. The role played by these instruments in providing accurate information on the health of the various goods produced is immense since assured quality ensures better marketability of the goods. The book is a welcome initiative by Dr. Sarkar and encompasses applied major modern and sophisticated instruments of quality monitoring. Prof. T. Kumar Director Indian School of Mines University ISM, Dhanbad Jharkhand
1 WATER, COOLING WATER, EFFLUENT WATER, DRINKING WATER SAMPLING 1. Point of Sampling In those cases where the effluent at a specific point is to be tested, the question of choosing the point of sampling does not arise. However, where the composition of an effluent as finally discharged by a factory is to be ascertained, the point of sampling shall be the final outlet of the effluent treatment plant where there is no treatment plant, it shall be the effluent outlet immediately outside the factory premises. 2. Frequency of Sampling When it is required to find out variations in the composition of an industrial effluent during a specified period, such as that of peak discharge, the samples shall be taken at short and appropriate intervals, say, every 5, 10, 15 or 30 minutes and analyzed. To study the average conditions over a cycle of operations or a period usually 24 hours or during the daily working period of the industry, the collection of composite sample shall be adopted. The composite sample shall be made by collecting at appropriate intervals samples from the common channel or drain at a point where the flow of the effluent is likely to be most representative of the entire volume, and mixing. The volume of the individual samples shall be a fixed proportion of the volume of the effluent flowing at that time. The interval should depend upon the frequency of the variation in the nature of the effluent and the volume of the flow. Care shall be taken to take the samples in such a way as to maintain the true proportion of suspended solids. Samples shall not be taken by skimming the top or scraping the bottom. A point about one-third of the way from the bottom shall normally be selected. The samples shall be drawn gently without unnecessary aeration. In most cases, collection of samples every hour would be sufficient. 3. Sampling Instrument Porcelain-lined or enamelled pails, in which the lining is unbroken