Issue Date: November 22,
1995
Revision Date: September 10, 2004
Estabrook
EZY CHEK Systems
(originally listed as
Horner EZY CHEK)
EZY-Chek
I
VOLUMETRIC
TANK TIGHTNESS TEST METHOD (OVERFILL)
Estabrook EZ
Chek Systems no longer manufactures or supports the use of
this method.
|
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.
Other liquids with known coefficients of expansion and
density may be tested after consultation with the manufacturer.
|
|
Tank
Capacity
|
Maximum
of 12,000 gallons.
Tank must be minimum 100% full.
|
|
Waiting
Time
|
Minimum
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
waiting time.
|
|
Test
Period
|
Minimum
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.
|
|
Temperature
|
Average
for product is determined by a resistance temperature
detector (RTD) and displayed on a LCD readout.
|
|
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 net pressure of 2-4 psi at
bottom of tank.
Groundwater level must be stable prior to and during test.
|
|
Calibration
|
Level
sensors must be calibrated in accordance with manufacturer's
instructions before each test.
|
|
Comments
|
Not
evaluated using manifolded tank systems.
|
