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_chart by <br /> _computer <br /> X by microprocessor <br /> 23 . Certain calculations are necessary to reduce and analyze the data. How are these calculations done? <br /> _ manual calculations by the evaluator on site <br /> _interactive computer program used by the <br /> _automatically done with computer program <br /> X automatically done with a microprocessor <br /> Detection Criterion <br /> 24 . What threshold is used to determine whether the pipeline is leaking? <br /> The threshold for any charge pressure, volume and bulk modulus can vary based on the time of pressure <br /> decay from pressure to 10 psi . For this evaluation, the threshold to declare an alarm was less than 12 <br /> minutes and 40 seconds . (in the units used by the measurement system) <br /> (in gal/hr) <br /> 25 . Is a multiple-test sequence used to determine whether the pipeline is leaking? <br /> _yes (If yes, answer the three questions below)no (If no, skip the 3 <br /> questions below) <br /> X no <br /> How many tests are conducted ? <br /> How many tests are required before a leak can be declared? <br /> What is the time between tests ? <br /> (Enter 0 if the tests are conducted one after the other. ) <br /> Calibration <br /> 26 . How frequently are the sensor systems calibrated? <br /> X never <br /> _before each test <br /> _weekly monthly <br /> _semi-annually <br /> _yearly or less frequently <br /> Pipeline Release Detection System Page 9 <br />