losses of energy. The main cause is wear on hose connectors and machine components, which is why it is vital to keep track of such pro- blems and take prompt action when they occur. It is advisable to regular- ly measure overall leakage with the aid of modern control and monitor- ing systems such as Sigma Air Manager. If an increase is recorded, the leaks must be tracked down and cured (fig. 5, see also instalment 10). 3. Cost management backs up

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