Issue Date: November 22, 1995
Revision Date: November 14, 1997
E'SPI IV (Mass
AUTOMATIC TANK GAUGING METHOD
||Leak rate of 0.2
gph with PD = 97.2% and PFA = 0.3%.
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
gallons. Tank must be between 50 and 95% full.
||Minimum of 6
hours between delivery and testing.
There must be no dispensing or
delivery during waiting time.
||Minimum of 2
hours, 15 minutes.
Test data are acquired and recorded by system's
Leak rate is calculated from average of subsets of all collected
There must be no dispensing or delivery during test.
product is determined by a minimum of 5 thermistors.
||Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.253
Minimum detectable change in water level is 0.029 inch.
probe must be checked and, if necessary, calibrated in accordance with
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
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 undetected.
EPA leak detection regulations
require testing of the portion of the tank system which routinely contains
Midwest Research Institute
Bredabaan 1201 - 2900
Tel: (816) 753-7600
Tel: 011-32-3-03/645 2790
Date of Evaluation: