Issue Date: November 22, 1995
Revision Date: January 12, 2015

Triangle Manufacturing, Inc.

TEI System 4000, Version 1.0


Certification Leak rate of 0.1 gph with PD = 99% and PFA = 4.8%.
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, fuel oil #4. 
Tank Capacity Maximum of 15,000 gallons. 
Tank must be between 50 and 100% full.
Waiting Time Minimum of 6 hours between delivery and testing. 
There must be no dispensing or delivery during waiting time.
Test Period Minimum is 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.
Temperature Average for product is determined by a minimum of 3 thermistors.
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 a minimum net pressure of 1 psi at bottom of tank during test.
Calibration Thermistors must be calibrated before each test in accordance with manufacturer's instructions.
Comments Not evaluated 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 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 product. 
May also be used as an overfill test method.


Triangle Environmental, Inc.

Evaluator: United States Testing Company

3726 Park Place

Tel:  (213) 723-7181

Montrose , CA 91020

Date of Evaluation:  04/02/91

Tel: (818) 301-7777



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