Issue Date: November 22, 1995
Revision Date: March 10, 2000
Environmental Monitoring System, EMS 2000, 3000, 3500 Series
(Ultrasonic Probes #401-0009, #401-0010, #401-0021, #401-0022)
AUTOMATIC TANK GAUGING METHOD
||Leak rate of 0.2
gph with PD = 96.2% and PFA = 3% for ultrasonic probes #401-0009 and
Leak rate of 0.2 gph with PD = 99.91% and PFA = 0.09% for ultrasonic
probes #401-0021 and #401-0022.
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 15,000
Tank must be between 50 and 95% full.
||Minimum of 2
hours between delivery and testing.
There must be no dispensing or delivery during waiting time.
||Minimum of 6
Test data are acquired and recorded by a microprocessor contained within
the EMS console.
Leak rate is calculated from data determined to be valid by statistical
There must be no dispensing or delivery during test.
product is determined by a minimum of 5 temperature sensors.
||Must be used to
detect water ingress.
Minimum detectable water level in the tank is 1.48 inches.
Minimum detectable water level change is 0.035 inch.
sensors and ultrasonic probe must be checked and, if necessary, calibrated
in accordance with manufacturer's instructions.
using manifolded tank systems. Therefore, this certification is only
applicable when there is a probe used in each tank and the siphon is broken
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.
EMS 2000 and 3000 Series are no longer manufactured by Tidel.
Tidel Engineering, Inc.
Ken Wilcox Associates
2025 West Beltline Road, #114
Date of Evaluation: