Volumetric Leak Testing

Table 11.20.2 summarizes common volumetric tank testing systems. These systems may be used to detect leaks and ascertain tightness of tanks and associated piping.

An experimental device that detects leaks based on laser interferometry is currently being developed by SRI International under contract to API (Figure 11.20.2). The device aims a laser beam at the underground tank and the beam is reflected to a detector that computes the liquid level in the tank. Test results to date indicate that this de vice can detect liquid level changes in micro-inches. The API has specified that the device must instantly detect leaks as small as 0.05 gph.

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