Issue Date: November 22, 1995
Revision Date: April 27, 2005

Purpora Engineering, Inc.

(Originally listed as Heath Consultants, Inc.)

Petro Tite II

Volumetric Tank Tightness Test Method (Overfill)

Certification Leak rate of 0.1 gph with PD = 99% and PFA = 1%.
Leak Threshold 0.05 gph.
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4.
Tank Capacity Maximum of 15,000 gallons.
Tank must be minimum 100% full.
An automatic product leveler must be used to maintain a constant product level during test.
Waiting Time None between delivery and testing.
There must be no dispensing or delivery during waiting time.
Test Period Minimum of 2 hours.
Test data are acquired and recorded manually.
Leak rate calculated based on cumulative volume change during low level test (generally based on 1 hour average volume change).
Product must be mixed continuously throughout test period.
There must be no dispensing or delivery during test.
Temperature Average for product is determined by a single DTS-2000 digital sensor.
Groundwater Depth to groundwater in tank excavation backfill must be determined.
If groundwater is above bottom of tank, product level must be adjusted to provide a minimum net pressure of 4 psi at bottom of tank during test.
Calibration Sensor calibration must be checked at each use and, if necessary, calibrated in accordance with manufacturer's instructions.
The DTS-2000 digital sensor must be recertified a minimum of once every 3 years.
Comments Not evaluated using manifolded tank systems.

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