What type of test is often used to confirm vapor recovery effectiveness?

The pressure decay test is commonly utilized to assess the effectiveness of vapor recovery systems. This test measures the ability of the vapor recovery unit to maintain pressure over a specified period. When a vapor recovery system is functioning correctly, it should effectively capture and hold vapors without allowing them to escape into the atmosphere.

During the pressure decay test, the system is pressurized, and the pressure is monitored over time. If there is a notable decrease in pressure, it suggests that there may be leaks or inefficiencies in the system, which would compromise its ability to recover vapors effectively. This makes the pressure decay test a critical part of ensuring that environmental standards are met and that the vapor recovery system operates as intended.

Other tests, such as leak detection and water balance tests, serve different purposes related to system integrity and performance but do not specifically measure vapor recovery effectiveness in the same direct manner as the pressure decay test. Fuel conductivity tests are associated with the measurement of fuel properties rather than vapor recovery functionality.