Standardisation of spares

Implement inventory control programme through standardisation of spares and detailed analysis of reasons for consumptions by joint consultation among chemical, mechanical, electrical teams and purchase officers from engineering stores. 

For an operating company, the standardisation of equipment designs and sizes increases interchangeability and reduces the stock of spares that have to be held in maintenance stores. 

Other Cresol-type Disinfectants and Antiseptics. Various non-irritant germicides of low toxicity, and therefore particularly suitable for disinfecting the skin and for application to wounds, contain different amounts of chloroxylenol, dichloroxylenol, benzyl cresols, o-phenylphenol, chloro-benzylphenols, special narrow-range boiling fractions of coal tar distillates, etc. They are usually dissolved in a soap, such as castor oil soap, and essential oil solution as they are only sparingly soluble in water. The various phenol coefficient tests, and particularly the Chick-Martin test, are of value in standardising such preparations, but they are of little value in determining their practical efficacy as antiseptics. For such purposes, other more specific tests are required which are beyond the scope of this book. 

Experimental procedure. Prepare the following in water 100 cm each of solutions 0.01 M iodine and 1 M in sulfuric acid, 500 cm of an aqueous sodium acetate solution (IM), and 1000 cm of a standardised solution of sodium thiosulfate (0.01 M). As iodine is sparingly soluble in water, the solution of 0.01 MI2 is prepared by dissolving the appropriate mass of iodine in an aqueous solution of 0.01 M KI. Also prepare a solution of starch indicator in water as follows mix 1 g of starch and 1 cm of hot water to form a paste, add 1 cm of the 1.0 M H2SO4 solution and 0.1 g NaHSOj and finally dilute to 250 cm. To a 250 cm Erlenmeyer flask, add the following quantities of the above solutions ... 

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