Issue Date: April 18, 1997
Revision Date: May 23, 2011
Compliance Center, Model 700
(7100 Series Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
Hasstech is no longer in business.
||Leak rate of 0.2
gph with PD = 99.9% and PFA = 0.1%.
||0.1 gph for leak
rate of 0.2 gph.
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
gallons. Tank must be between 50 and 95% full.
||Minimum of 2
hours between delivery and testing. Minimum of 2 hours between dispensing
There must be no delivery during waiting time.
||Minimum of 2
hours for leak rate of 0.2 gph.
Test data are acquired and recorded by system's computer.
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 thermistors.
||Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.186 inch.
Minimum detectable change in water level is 0.0048 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 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. System no longer being
manufactured and no support is available.
Ken Wilcox Associates