||Leak rate of 0.1
gph with PD = 99.99% and PFA = 0.005%.
A tank system should not be declared tight if the test result indicates a
loss or gain that equals or exceeds this threshold.
aviation fuel, fuel oil #4.
||Maximum of 18,000
Tank must be between 11 and 95% full.
||Minimum of 6
hours between delivery and testing.
None between dispensing and testing.
There must be no delivery during waiting time.
||Minimum of 3
Test data are acquired and recorded by system's computer.
Leak rate is calculated from average of subsets of all collected
There must be no dispensing or delivery during test.
product is determined by temperature sensor probes.
A minimum 12 inches of product must be present for the temperature probes
to operate properly.
groundwater in tank excavation backfill must be determined.
If groundwater is above bottom of tank, product level must be adjusted
during test to provide a minimum net pressure of 1 psi at bottom of tank
probes and floats must be checked for proper operation prior to each test.
using manifolded tank systems.
Tests only portion of tank containing product.
As product level is lowered, leak rate in a leaking tank decreases (due to
lower head pressure).
Consistent testing at low levels could allow a leak to remain
EPA leak detection regulations require testing of the portion of the tank
system which routinely contains product.