To test the dispenser piping on the suction side of a Healy Phase II EVR system, what size water column gauge is required?

• A. 0-2 inch
• B. 0-5 inch
• C. 0-10 inch
• D. 0-100 inch

Answer: (D)

The correct choice specifies the most suitable size for a water column gauge used to test the dispenser piping on the suction side of a Healy Phase II EVR (Enhanced Vapor Recovery) system. Typically, this type of system requires accurate measurement of pressure levels to ensure proper functioning and compliance with environmental regulations.

A gauge that can measure up to 100 inches of water column provides the necessary range to detect even a slight deficiency in vacuum pressure in the piping system. This is crucial for identifying leaks or other issues that may affect the vapor recovery performance. A gauge with a lower range, such as 2, 5, or 10 inches, may not provide sufficient detail for detecting smaller pressure variances, which are often critical in ensuring that the system operates effectively and efficiently.

Using a gauge that can measure up to 100 inches allows operators to have a comprehensive view of the system’s pressure status, enabling them to maintain the integrity of the fuel vapor recovery process and meet regulatory standards. This makes the 0-100 inch gauge the most appropriate tool for testing the dispenser piping in this scenario.