Issue Date:  April 19, 2011

Mass Technology Corp.

Precision Mass Measurement Systems CBU-1000D


Certification Calculated minimum detectable leak rate of 0.1 gph with PD > 95% and PFA < 5%.
Leak Threshold

Calculated leak threshold is 0.055 gph with PD = 95% and PFA = 5%.

A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold.


Gasoline, diesel, aviation fuel, fuel oil #4.

Tank Capacity Maximum size of tank = 76,500 gallons.
Waiting Time

Minimum of 1.5 hours after delivery or dispensing.

Waiting times during evaluation ranged from 20 minutes to 1.5 hours.

Test Period

Minimum of 13 hours.
There must be no dispensing or delivery during test


Measurement not required by this system.


Tank may not be tested unless the groundwater level is known to be below the tank bottom.


Differential pressure sensor must be checked regularly in accordance with manufacturer's instructions.


This method was not evaluated with groundwater taken into account.  Test results are not valid when it is not demonstrated that the groundwater level is below the bottom of the tank during the test.

Tests only portion of tank containing product.

The tank must be at least 90% full.

Evaluated in a nominal 51,000 gallon, horizontal cylindrical steel tank with a diameter of 13 feet and a length of 54 feet containing JP-5 jet fuel.


Mass Technology Corp.

Evaluator:  Ken Wilcox Associates, Inc.

P.O. Box 1578

Tel:  (816) 443-2494

Kilgore, TX 75663

Date of Evaluation:  08/19/09

Tel:  (903) 986-3564



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