HYDROGUARD®
THE HYDROGUARD® MONITORING SYSTEM GUARDS AGAINST LEAKS AND LIABILITIES
Envirotank recommends the Hydroguard® Monitoring System for double-wall tanks because of its superior leak detection capability. By filling the cavity between the inner and outer tank walls with a non-toxic water based food dye, hydrostatic pressure is continuously applied to both the primary and secondary tanks. This system is capable of detecting tank leaks in either the primary or secondary tank walls for all installed conditions. The Hydroguard® Monitoring System provides continuous leak detection during transport, installation and operation in all installed conditions avoiding false alarms caused by changes in product temperature, product level or ground-water conditions.
HOW THE HYDROGUARD® MONITORING SYSTEM WORKS
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.