Double-Wall Fiberglass Tanks: Monitoring System Configurations
Part I
Hydrostatic Monitoring System:
We recommend the Hydrostatic Monitoring System because it offers a leak detection capability that is superior to other methods. It constantly monitors 100% of both the inner and outer walls under all installed conditions. Most steel tanks do not offer this feature. The Hydrostatic Monitoring System can also double as a precision tank test, which has been independently tested and validated to meet EPA precision tank-testing requirements, able to detect leaks as small as 0.1 gallons per hour. The precision tank-testing procedure is easy to perform and consists of a few simple steps.
Superior Leak Detection:
Containment Solutions recommends the Hydrostatic 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-hazardous liquid, hydrostatic pressure is continuously applied to both the primary and secondary tank. This system is capable of detecting tank leaks in either the primary or secondary tank walls for all installed conditions.
Meets EPA and NFPA precision tank test criteria:
The Hydrostatic Monitoring System, with a stand pipe, can also serve the dual function of a precision tank test. The system has been independently tested and statistically validated to meet the EPA and National Fire Protection Association’s criteria as a precision tank test. Using a stand pipe, the system has been shown to be capable of detecting leaks as small as 0.10 gallons per hour with a 99.9% probability of detection and less than a 1.2% probability of a false alarm.
All the fiberglass double-wall tanks in this group can include the optional fiberglass reservoir necessary for the Hydrostatic Monitoring System.
The Hydrostatic Monitoring System provides continuous leak detection while avoiding false alarms caused by changes in product temperature, product level, tank deflection under loads, or groundwater conditions.
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Normal Conditions:
The reservoir liquid level will be stable if both the inner and outer tanks are tight. The reservoir sensor will active if the reservoir drains or overfills.
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Inner wall breach:
Monitor fluid drains into the primary tank causing the reservoir liquid level to drop and activate alarm. No petroleum product escapes from the primary tank to contaminate the annular space.
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Outer wall breach groundwater below tank top:
If the groundwater is below the tank top, the monitor fluid drains into the ground, causing the reservoir liquid level to drop and activate the alarm.
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Outer wall breach groundwater over tank top:
If the groundwater is over the tank top, the reservoir will fill up with groundwater and activate the high level alarm on the reservoir sensor.
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