This involves thorough record keeping of product purchases and consumption, regular inspections, and recognition of conditions indicating leaks. This simple, low-cost leak-detecting method is applicable to any product stored or transported in pipelines. In addition, it does not require interruption of tank service or a set degree of tank fullness. However, this method requires good bookkeeping and will not detect small leaks. Table 11.20.4 summarizes three common inventory monitoring techniques.
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