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UST Program - LG 113

UST Programs - LG 113

Issue Date: April 18, 1997
Revision Date: December 6, 2002

ProTank, Inc.

UTF-5000 Ullage Tester 
(Pressure Test)


Certification Leak rate of 0.1 gph with PD = 95.24% and PFA = 0%.
Leak Threshold A tank system should not be declared tight when the make-up gas flow rate into ullage equals or exceeds 0.275 cubic feet/hour.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4.
Other liquids may be tested after consultation with the manufacturer.
Tank Capacity Maximum ullage volume is 7,500 gallons.
Waiting time Minimum of 2 hours between delivery and testing.
Test Period Minimum of 20 minutes, consisting of 2 consecutive 10-minute test periods.
Test data are acquired and recorded manually.
There must be no dispensing or delivery during test.
Test Pressure Pressure must be increased in ullage such that total pressure at bottom of tank does not exceed 5.0 psi.
Pressure must be maintained for a minimum of 5 minutes per 1,000 gallons of ullage.
At conclusion of this stabilization period, ullage pressure must be reduced by 0.5 psi for remainder of test.
Temperature Ullage must be monitored for rate of temperature change, which must not exceed manufacturer's tabulated values.
Groundwater Depth to groundwater in tank excavation backfill must be determined.
If groundwater is above product level, net pressure must exceed 1 psi in the ullage during test.
If this requires more than 5 psi total pressure at tank bottom, the ullage test must not be used.
Comments Not evaluated using manifolded tank systems.
Evaluated using diesel. Tests only ullage portion of tank.
Product-filled portion of tank must be tested using a volumetric underfill test method.


ProTank, Inc.

Evaluator: Midwest Research Institute

3545 Lomita Blvd., Suite G

Tel: (816) 753-7600

Torrance, CA  90505

Date of Evaluation: 12/04/92

Tel: (800) 438-1111



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