Fiberglass tanks of adequate size and appropriately designed internal piping (with or without an Oil Stop Valve) will allow rainwater to glow through the system unimpeded. If there is a transformer leak or failure, the oil would enter the tank and be captured.
The addition of an oil stop valve to the outlet pipe of the tank will ensure the oil is contained.
Even though oil-filled operational equipment as defined 40 CFR 112.2 are exempt from the secondary containment requirement, the sites must still comply with the spill prevention, control, and countermeasures (SPCC) rules to prevent oil from entering the navigable waters of the United States.
CSI interceptors reduce particulates and hydrocarbons in industrial waste water prior to sewer discharge.
From facilities requiring treatment prior to sewer discharge of:
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Electrical Power Substation Tanks