Spill and Overfill Prevention. Alaska Spring 2004. The Basics. Spill Prevention Device Overfill Prevention Device A Caution about Ball Float Valves and Alarms Fuel Deliveries Periodic Maintenance. 18 AAC 78.040.
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(2) overfill prevention equipment that will
(A) automatically shut off flow into the tank when the tank is no more than 95 percent full; or
(B) alert the transfer operator when the tank is no more than 90 percent full by restricting the flow into the tank or by triggering a high-level alarm.
PEI/RP 100-2000 edition, Page 13, Section 6.3.3 issues this warning:
A vent restriction device should not be installed on emergency generator or heating oil tanks.
ADEC decided to adopt this restriction to prevent overfills with 18 AAC 78.040(e).
If a UST system has one or more of the following, the owner or operator of the system shall not use a ball float valve or vent restrictor shut-off device on that system:
Vent restriction devices should not be installed on emergency generator or heating oil tanks. The reason is that typically, these tanks are filled by the gravity method. So, when the vent restriction device (ball-float valve) closes it creates a static head from the transport/fuel oil or heating oil delivery truck and forces product up the suction line. The liquid is seeking the same level as that in the transport.