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T PEI/RP1200-17 7.1.3 Description of Inspection. After a pre- 7. UST OVERFILL liminary inspection of the automatic shutoff instal- EQUIPMENT lation, the drop tube is removed from the tank.The automatic shutoff is checked for proper operation, VERIFICATION and its placement is measured to verify that it is INSPECTION AND properly located to completely shut off flow when TESTING the tank is no more than 95 percent full. 7.1.4 Preparation. Refer to the tank manufac- Although the effectiveness of overfill prevention devices turer's calibration chart for the capacity in gal- can be tested by attempting to overfill an underground lons, the diameter and the volume of product with storage tank(UST)with product and determining how well respect to product level. the device functions, this approach is not recommended. Any malfunction in the overfill prevention device could If the automatic shutoff device has a float that result in a product release that could result in a threat to extends from the drop tube in the shutoff(closed) pposition, verify the proper orientation of the float public health and safety and environmental damage. mechanism.The float mechanism should be orient- Federal UST rules require that overfill prevention ed away from any obstructions(ball float,submers- equipment automatically restrict flow or alert the transfer ible turbine pump [STP], tank wall, tank gauge operator when the tank is no more than 90 percent full probe, etc.) If the movement of the float mecha- or shut off flow into a tank when it is no more than nism is restricted,it will not function as designed. 95 percent full. Other alternatives to prevent overfills are the restriction of flow during a delivery 30 minutes Use this procedure in conjunction with the manu- prior to overfilling; alerting the operator l minute before tier's installation and maintenance instruc- eons. overfilling may occur; or automatically shutting off flow ons. into a tank so that none of the fittings located on top of 7.1.5 Inspection Equipment. Test equipment the tank are exposed to product due to overfilling. shall include: The PEI Overfill, Release Detection and Release • tools for removal of the drop tube; Prevention Equipment Testing Committee has written tape measure; the recommended practices for automatic shutoff devices to reflect that the devices must be set to shut off flow • tools for inspection of the automatic shutoff. when the tank is no more than 95 percent full, and flow restriction and overfill alarm devices must automatically 7.1.6 Inspection Procedure. restrict flow or alert the transfer operator when the tank 1.Remove the drop tube from the tank. is no more than 90 percent full.This approach reflects the more conservative application of the rules. 2.Visually inspect the automatic shut off valve and float mechanism for any damage or corrosion 7.1 Automatic Shutoff Devices. that inhibits the functionality of the device, and remove any debris and foreign objects. 7.1.1 General. Automatic shutoff devices, sometimes called flappers or flapper valves, are 3.Manually move the float mechanism to ensure it an integral part of the drop tube assembly installed moves freely. within the tank fill riser. They are designed to 4.With the float mechanism in the shutoff(closed) initially restrict and subsequently completely shut position, visually inspect the drop tube and off flow when product has reached predetermined verify that the shutoff valve is released and will levels during a delivery.Automatic shutoff valves move into the product flow path. need to be properly positioned and operate freely to 5.If possible, verify that the bypass valve in the control flow and prevent tank overfills. drop tube is open and free of blockage. 7.1.2 Purpose. The purpose of this inspection 6.If problems with the shutoff valve are found and is to verify the automatic shutoff valve is installed defective components need repair or replace- properly, operates as designed and is set to com- ment,notify the appropriate person. pletely shut off flow when the tank is no more than 95 percent full. ®i pei.org