Issue Date: November 22, 1995
Revision Date: January 12, 2015
4000, Version 1.0
VOLUMETRIC TANK TIGHTNESS TEST
||Leak rate of 0.1
gph with PD = 99% and PFA = 4.8%.
A tank system should not be declared tight if the test result indicates a
loss or gain that equals or exceeds this threshold.
fuel oil #4.
||Maximum of 15,000
Tank must be between 50 and 100% full.
||Minimum of 6
hours between delivery and testing.
There must be no dispensing or delivery during waiting time.
determined by system's computer.
Average was 4 hours during the evaluation.
Leak rate is calculated from last 2 hours of test period data.
Test data are acquired and recorded by system's computer.
There must be no dispensing or delivery during test.
product is determined by a minimum of 3 thermistors.
groundwater in tank excavation backfill must be determined.
If groundwater is above bottom of tank, product level must be adjusted to
provide a minimum net pressure of 1 psi at bottom of tank during test.
be calibrated before each test in accordance with manufacturer's
using manifolded tank systems.
Tests only portion of tank containing product. As product level is
lowered, leak rate in a leaking tank decreases (due to lower head
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.
May also be used as an overfill test method.
Evaluator: United States
3726 Park Place
Tel: (818) 301-7777