Welcome to the State Water Resources Control Board Welcome to the California Environmental Protection Agency
Governor's Website Visit the Water Board Members Page
My Water Quality
Performance Report
UST Program - LG 113

UST Programs - LG 113

Issue Date: November 22, 1995
Revision Date: December 6, 2002

Tanknology - NDE

UTS-4T Ullage Test (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.


Tanknology - NDE

Evaluator:  Midwest Research Institute

8900 Shoal Creek Blvd., Building 200

Tel:  (816) 753-7600

Austin, TX 78757

Date of Evaluation:  12/04/92

Tel:  (800) 800-4633


 | Home | Vendors: A - F | Vendors: G - M | Vendors: N - S | Vendors: T - Z | Method Index |

Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee of the performance of the method or equipment.
Equipment should be installed and operated in accordance with all applicable laws and regulations.
For full details, please refer to our expanded "DISCLAIMER" page.