Double-Wall Tanks
HydroGuard® Monitoring System guards against leaks and liabilities
Normal Conditions
The reservoir liquid level will be stable if both the inner and
outer tanks are tight. The optional reservoir sensor will activate
an alarm if the reservoir drains or overfills.
Inner Wall Breach
HydroGuard® fluid drains into the primary tank causing the reservoir
liquid level to drop. No petroleum product escapes from the primary
tank to contaminate the annular space.
Outer Wall Breach
Groundwater Below Tank Top
If the groundwater is below the tank top, the HydroGuard® fluid
drains into the ground, causing the reservoir liquid level to drop.
Outer Wall Breach
Groundwater Over Tank Top
If the groundwater is over the tank top, the reservoir will fill
up with groundwater.
Wet Annular Space
HydroGuard® Hydrostatic Monitoring System
- Use antifreeze solution in cold climates.
- Maximum burial depth from tank top is 2.1m below
grade.
- Monitoring cavity must be vented to the atmosphere
at all times.
- After installation, set the liquid level in the
reservoir so reservoir is half full.
- The optional reservoir sensor if installed will
alarm for preset events.
Monitoring System with Liquid Sensor
Typical configuration for an electronic sensor or manual dipstick.
- Use the standard monitoring fitting.
- Monitoring cavity can be vented or sealed.
Dry Annular Space
Envirotank also provides the option of a factory-installed
“drawstring” at the annular space monitoring fitting,
to assist in positioning liquid sensors at the bottom of the annular
space.
If your tank is ordered with a dry annular
space, but fitted with the optional fibreglass reservoir (instead
of a monitoring fitting), the drawstring will be positioned within
the reservoir.
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