Overfill Prevention Testing — All Device Types

Independent Functional Testing Under EPA 40 CFR §280.43(h)

Overfill prevention testing is a distinct regulatory requirement — separate from spill containment inspection. EPA 40 CFR §280.43(h) requires that overfill prevention equipment be functionally tested to verify it activates correctly before tank capacity reaches 95%. USTEX performs independent testing of every device type with no repair conflicts.

Overfill Device Types Tested

• Ball Float Valve Testing — Functional verification of mechanical ball float valves that stop product delivery at 90% tank capacity. Confirms proper engagement, flow restriction, and reset after delivery.
• Flapper Valve Testing — Operability testing of drop tube flapper valves. Verifies proper flapper engagement, absence of bypass leakage, and mechanical freedom of movement.
• Drop Tube Restrictor Verification — Inspection of restrictors designed to slow delivery flow before the 90% threshold, providing an early-warning stage during deliveries.
• Electronic Alarm System Testing — Functional testing of high-product alarm systems tied to ATG probes and float-switch sensors. Verifies alarm setpoint accuracy and signal transmission.
• ATG High-Product Alarm Verification — Confirmation that ATG console activates the high-product alarm at the correct setpoint calibrated to 90% tank capacity per EPA 40 CFR §280.43(h).
• Audible/Visual Alarm Confirmation — Testing of external alarm indicators at the delivery point to confirm drivers receive adequate warning before a release can occur.

Testing Frequency

Wisconsin requires annual functional testing of overfill prevention equipment. Some EPA states use a triennial (3-year) cycle. USTEX structures programs to match your state's regulatory calendar.

Regulatory Standards

EPA 40 CFR §280.43(h) • Wisconsin ATCP 93 • WIDATCP Specialty Firm #560989 • PEI RP100

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