A leak programme usually fails on the demand side rather than the detection side, so compressed air is taught as a system. A survey that finds and fixes leaks while ignoring the control strategy can save nothing at all, and the book works through exactly that case.
Every economic quantity is derived from the plant’s own metered figures, with the assumptions stated. No cost per leak is quoted, because there is no honest general one.
Study material written by Sensemore. It is not accredited training, it is not from any certification body’s question bank, and it confers no certification.