Issue Date: April 18, 1997
Revision Date: December 6, 2002
NON-VOLUMETRIC TANK TIGHTNESS
TEST METHOD (ULLAGE)
||Leak rate of 0.1
gph with PD = 95.24% and PFA = 0%.
||A tank system
should not be declared tight when the pressure decay trend equals or
exceeds ± 0.016 psi/hr.
aviation fuel, fuel oil #4.
volume is 10,260 gallons.
||Minimum of 2
hours between delivery and testing.
||Minimum of 30
minutes (after data trend has been established).
There must be no dispensing or delivery during test.
||Total pressure of
4.0 psi must be applied at bottom of tank.
||Ullage must be
monitored during test, and a correction factor is applied to account for
If ullage temperature changes exceed 5 degrees F, test must not be
groundwater in tank excavation backfill must be determined.
If groundwater is above product level, net pressure must be maintained at
a minimum of 1 psi in the ullage during test.
using manifolded tank systems.
Evaluated using diesel. Tests only ullage portion of tank.
Product-filled portion of tank must be tested using a volumetric underfill
ADA Technologies, Inc.
Manufacturer’s Previously Listed Contact Information is No