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Section 5Spill and Overflow Prevention

Section 5 Spill and Overfill PreventionRegulationsSpill Buckets Operation and MaintenanceOverfill ProtectionAlarmsFloat ValvesAutomatic Shutoff

Section 5 Regulations Spill and Overfill PreventionProper labelingSize of tankType of substanceAvailable volume Monitor transfer of productMaintenance of Spill Prevention Equipment

Spills and overfills often occur when the product is being delivered into a storage tank. Before delivering product to a tank, you should be sure the volume available in the tank is greater that the volume of the product being delivered. During a delivery, the transfer of product must be constantly monitored.

Spill buckets are large containers that surround the fill port. They are installed to contain spills of fuel that occur during delivery.

The owner or operator of a UST is responsible to clearly mark the fill lines with the size of the tank and the type of substance stored using color markings or with a permanent sign.

It is the responsibility of the Class B operator to conduct regular monthly inspections of spill prevention equipment.Section 5 Spill Buckets Spill and Overfill PreventionDefinition & purposeSizeDrainsManual pumpsLidsMaintenance

Spill buckets are required to hold a minimum of five gallons, but buckets with a capacity of up to 25 gallons are common. Spill buckets without a drain valve are equipped with a manual pump. When draining a spill bucket, it is important not to allow any water or debris to enter the tank. Any mixture of product, water, and/or debris should be pumped out of the spill bucket and properly disposed. Spill bucket lids must be regularly inspected for damage or possible leaks to assure that no surface water is allowed to enter.Section 5 Overfill Protection Spill and Overfill PreventionDefinition and purposeOverfill alarmBall float valveSituations NOT to use ball float valve Automatic shut-off

Overfill protection is designed to prevent tanks from being overfilled during delivery. The three types of overfill protection are overfill alarms, ball floats, and automatic shut-off devices.

An overfill alarm has a sensor located in the tank connected to a monitoring device. An alarm will sound when product in the tank reaches 90% of the tanks capacity.

A ball float valve (or float vent valve) is located in the vent pipe. It works by restricting vapor flow and therefore restricting flow rate of product delivery. The float valve is also designed to operate when the tank has reached 90% capacity.

An automatic shut-off device, also known as a flapper valve, is a mechanical device installed in the drop tube below the fill port. It slows down and then stops fuel delivery when product has reached tank capacity.