Tank Monitoring

There are four general methods for detecting leaks in USTs:

• Volumetric (quantitative) leak testing and leak rate measurement

• Non-volumetric (qualitative) leak testing

• Inventory monitoring

• Environmental monitoring

These methods can be used independently or in combination.

Figure 11.20.1 illustrates some of these leak detecting alternatives.

Regardless of the UST monitoring techniques used, the effects of major variables must be compensated for (Table 11.20.1). It is important for USTs to be tested under conditions close to normal operating conditions without uncovering the tanks. Uncovering tanks or piping is expensive and time-consuming, and can cause new leaks. Inadvertent pressurization during testing may rupture the tank and piping.

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