group replacement

group replacement

a PREVENTIVE MAINTENANCE system which replaces groups of items such as lightbulbs at predetermined intervals, even though they may not all have come to the end of their life. This is done because group replacement can be more cost-effective than the replacement of individual items as they fail, if the cost of replacement units is low and the labour and other costs of replacing them are high.
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Rated life provides a suitable group replacement point, but whether rated life is actual end of life is subject to a great deal of variability.
A well known example of non-classical bioisosteric replacement have been reported for the hydroxyl group as shown in case of bronchodilator isoprenaline (isoproterenol) in which 3-OH group replacement with other bioisosteric group like 3- CH 2 OH, resulting salbutamol (albuterol), selective beta-2 agonist, a well known anti-asthamatic drug, by 3-NHSO 2 CH 3 , resulting soterenol and by 3- NHCONH 2 , resulting carbuterol [42-43].
Group replacement is an appropriate procedure for routine maintenance, and its frequency has a direct bearing on the installed electrical load.
To minimize capital and energy costs, it is obviously important that lighting equipment be cleaned periodically and lamps replaced on a regular group replacement basis.

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