Issue Date: July 31, 2009

Revised:  August 20, 2009

TOPS, Inc.

(marketed by Westech Inc.)


Pnuemercator TMS 2000, TMS 3000

(Magnetostrictive Probe)



Leak rate of 0.2 gph with PD = 95.0% and PFA = 5.0% for 2 hour test.

Leak rate of 0.2 gph with PD = 99.8% and PFA = 0.2% for 4 hour test.

Leak rate of 0.2 gph with PD = 99.9% and PFA = 0.1% for 8 hour test.

Leak rate of 0.1 gph with PD = 95.3% and PFA = 4.7% for 7 hour test.

Leak rate of 0.1 gph with PD = 95.8% and PFA = 4.2% for 8 hour test.

Leak Threshold

0.1 gph for leak rate of 0.2 gph.

0.05 gph for leak rate of 0.1 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, aviation fuel. 
Tank Capacity Maximum of 20,000 gallons. 
Tank must be between 20 and 95% full.
Waiting Time Minimum of 8 hours between delivery and testing. 
Minimum of 20 minutes between dispensing and testing. 
There must be no delivery during waiting time.
Test Period

Minimum of 2 hours for leak rate of 0.2 gph.

Minimum of 7 hours for leak rate of 0.1 gph.
Test data are acquired and recorded by system's computer. 
Leak rate is calculated from data determined to be valid by statistical analysis. 
There must be no dispensing or delivery during test.


Average for product is determined by probe which contains 5 thermistors.

At least one thermistor must be submerged in product during test.

Water Sensor Must be used to detect water ingress. 
Minimum detectable water level in the tank is 0.488 inch. 
Minimum detectable change in water level is 0.124 inch.
Calibration thermistors and probe must be checked and, if necessary, calibrated in accordance with manufacturer's instructions.

Not evaluated using manifolded tank systems. Therefore, this certification is only applicable when there is a probe used in each tank and the siphon is broken during testing. 
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.

Equipment is manufactured by Pneumercator for TOPs, Inc. and is marketed by Westech, Inc.


TOPS, Inc.

Evaluator:  Ken Wilcox Associates

P.O. Box 57307

Tel:  (816) 443-2494

Salt Lake City, Utah 84157

Date of Evaluation:  07/15/97

Tel:  (800) 433-8831



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