9.4
No-Well Monitoring, Double-Wall Tank
The space between the walls of a double-wall tank is the interstitial
space, and it is an ideal location for liquid sensors.
If the outside tank wall develops a leak, groundwater enters the
interstitial space and the liquid sensor triggers an alarm.
If the inside wall develops a leak, the tank contents enter the interstitial
space and both sensors indicate an alarm condition.
Error! Reference source not found. shows a typical sensor layout for a
double-wall tank.
Figure 9-5 No-Well Monitoring, Double-Wall Tank
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