If a type I interceptor is 18 feet from the point of connection to the building drain, what is the minimum size vent required?

In plumbing systems, the sizing of vents is crucial to ensure proper drainage and to prevent siphoning of traps. For a Type I interceptor, which typically deals with grease and oil from kitchen waste, specific venting requirements must be adhered to maintain the system's efficiency and functionality.

When considering the distance from the interceptor to the point of connection to the building drain, any rise in distance over 10 feet often requires an increase in the size of the vent to accommodate the needed airflow. In this scenario, since the Type I interceptor is 18 feet away from the point of connection, a 2-inch vent is necessary to effectively handle the air pressure changes and to prevent the formation of negative pressure which could lead to issues like trap siphoning.

The 2-inch vent size is the minimum requirement recognized in plumbing codes for this situation, as it provides adequate air circulation throughout the system and allows for the proper function of the drainage system while preventing odors from escaping. Vent pipes play a pivotal role in maintaining the pressure balance within the drainage system, ensuring that waste can flow freely and traps retain water to block sewer gases.

Therefore, the choice of a 2-inch vent is not only aligned with code requirements but also supports the overall health of the plumbing system