USEPA Method 27

Testing Overview
Testing Services
Personnel
Equipment
Industries Served
Test Methods
Pollutants
Sources
Training
Oversight
Technical Procedures
Technical Questions
Safety
Quality

Vapor Tightness of Gasoline Delivery Tank Using Pressure Vacuum Test – USEPA Method 27

USEPA Method 27 is used for the determination of vapor tightness of a gasoline delivery tank which is equipped with vapor collection equipment. Pressure and vacuum are applied alternately to the compartments of a gasoline delivery tank and the change in pressure or vacuum is recorded after a specified period of time.

Testing problems may occur due to the presence of volatile vapors and/or temperature fluctuations inside the delivery tank. Under these conditions, it is often difficult to obtain a stable initial pressure at the beginning of a test, and erroneous test results may occur. To help prevent this, it is recommended that prior to testing, volatile vapors be removed from the tank and the temperature inside the tank be allowed to stabilize. Because it is not always possible to completely attain these pretest conditions, a provision to ensure reproducible results is included. The difference in results for two consecutive runs must meet the criteria detailed in the method.

To Speak To A Sales Representative Call 800-627-0033

Last Update: October 25, 2006