Issue Date: November 22,
Revision Date: September 10, 2004
EZY CHEK Systems
(originally listed as
Horner EZY CHEK)
TANK TIGHTNESS TEST METHOD (OVERFILL)
Chek Systems no longer manufactures or supports the use of
rate of 0.1 gph with PD = 99% and PFA = 1%.
A tank system should not be declared tight if the test
result indicates a loss or gain that equals or exceeds
diesel, aviation fuel, fuel oil #4.
Other liquids with known coefficients of expansion and
density may be tested after consultation with the manufacturer.
of 12,000 gallons.
Tank must be minimum 100% full.
of 6 hours between delivery and testing. Minimum of 3
hours between "topping off" and testing.
Total minimum waiting time is 6 hours.
There must be no product dispensing or delivery during
of 1 hour, 30 minutes (30 minute monitor period, plus
1 hour test period).
Testing must continue until data meets manufacturer's
stop test criteria.
Volume data are collected and recorded by a strip chart
recorder. Leak rate is calculated from data of last 1
hour of test period.
There must be no dispensing or delivery during test.
for product is determined by a resistance temperature
detector (RTD) and displayed on a LCD readout.
to groundwater in tank excavation backfill must be determined.
If groundwater is above bottom of tank, product level
must be adjusted to provide net pressure of 2-4 psi at
bottom of tank.
Groundwater level must be stable prior to and during test.
sensors must be calibrated in accordance with manufacturer's
instructions before each test.
evaluated using manifolded tank systems.