Where is a vapor shear valve installed?

• A. At the vapor adaptor
• B. At the entrance to a condensate tank
• C. At the base of each dispensing device
• D. At the ball float valve

Answer: (B)

The vapor shear valve is typically installed at the entrance to a condensate tank. Its main function is to prevent vapor from escaping into the atmosphere during the loading of vapors into the tank, helping to manage the vapor recovery process. This valve works by shearing off any vapor present in the line and allows for the safe handling of the liquid without releasing vapors, which is crucial for compliance with environmental regulations and safety standards.

Installing the vapor shear valve at this location ensures that it can effectively manage and contain any vapor buildup during operations, maintaining the integrity of the vapor recovery system. This is critical in preventing emissions that could arise from over-filling or during other operational activities.

In contrast to other locations mentioned, such as the vapor adaptor or the base of dispensing devices, those areas are not typically associated with the main vapor recovery processes involving condensate management and vapor containment. Therefore, the entrance to a condensate tank is the most appropriate location for this type of valve.