Piping Failures

The underground piping that connects tanks to each other, to delivery pumps, and to fill drops is even more frequently made of unprotected steel. An EPA study found that piping failure accounts for a substantial portion of large spills at UST facilities. The study concluded that piping failure is caused equally by corrosion and poor workmanship. Threaded metal areas, made electrically active by the threading, have strong tendency to corrode if not coated and cathodically protected. Improper layout of pipe runs, incomplete tightening of joints, inadequate cover pad construction, and construction can accidents lead to failure of delivery piping. Figure 11.19.1 diagrams a typical service station tank and piping layout.

FIG. 11.19.1 Typical service station tank and piping layout (EPA).
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