If the dispensing vacuum of the Healy VP-1000 pump is below how many inches of water column, should the dispenser be removed from service?

• A. 50
• B. 60
• C. 75
• D. 100

Answer: (B)

The correct answer indicates that if the dispensing vacuum of the Healy VP-1000 pump falls below 60 inches of water column, the dispenser should be removed from service. This specification is critical for ensuring the efficiency and safety of the vapor recovery system.

A minimum vacuum threshold is necessary for the effective operation of the vapor recovery pump. When the vacuum is too low, it may not be able to effectively capture vapors during fuel dispensing, which can lead to environmental contamination and regulatory non-compliance. By setting this threshold at 60 inches of water column, it ensures that the system has ample capacity to manage vapor recovery as intended and prevents potential issues that arise from insufficient vacuum levels.

Understanding this specific measurement helps maintain optimal performance of the pump and compliance with environmental regulations. Regular monitoring and maintenance based on such benchmarks are essential for safe and effective operation of vapor recovery systems.