Certification

Leak rate of 0.2 gph with PD > 99% and PFA < 1% for both single and manifolded tank systems.
Leak rate of 0.1 gph with PD > 98% and PFA < 2% for single tank systems.
Leak rate of 0.1 gph with PD > 99% and PFA < 1% for manifolded tank systems.

Leak Threshold

0.10 gph for a leak rate of 0.2 gph
0.05 gph for a leak rate of 0.1 gph. 
This leak threshold is for evaluation purposes only.
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds the leak threshold calculated from the data set. This leak threshold may be different than the above leak threshold.

Applicability

Gasoline, diesel.

Tank Capacity

Maximum of 30,000 gallons for single tank. 
Maximum of 45,000 gallons cumulative capacity for manifolded tank systems with no more than 4 tanks in the system.

Data Requirement

Minimum of 26 days of data is required.

System Features

This system requires a detailed evaluation of daily inventory measurements by a trained technician located at the corporate office.

Comments

The evaluation showed significant differences in results from manifolded tank systems and single tank systems resulting in different PA/PFA when used for leak rates of 0.1 gph.
51% of data sets evaluated were from manifolded tank systems. 
Of 41 data sets submitted for evaluation, all were analyzed with conclusive results. 
Median monthly throughput of tanks evaluated was 24,175 gallons. 
Variable leak rates ranging from 0.047 gph to 0.233 gph were used in the evaluation. 
Data sets evaluated were supplied by the evaluator.
Gains (water ingress) are analyzed and evaluated on an individual basis. If found significant, an investigation flag will be triggered, indicating an action is required by the operator.
This system is primarily designed as a service provided by the vendor.