Installation Instructions For Plumbing Drain And Vent Pipes Using Sanitary Tee's
Sanitary tees are T-shaped fittings that allow plumbers to connect pipes at a 90-degree angle. The video highlights a specific detail regarding the orientation of sanitary tees and how it can impact airflow within the plumbing system.
Key Points on Sanitary Tee Installation:
Upright Position for Drains: The sanitary tees for drains should be installed in an upright position. This ensures a proper slope of ¼ inch per foot, allowing water to flow smoothly towards the drain.
Angled Outlet for Vent Pipes: The video suggests that the outlet on a sanitary tee specifically designed for vent pipes might be angled slightly upwards. This angled design could potentially provide a smoother transition for the vent pipe, which typically slopes at a ¼ inch per foot angle as well. However, the creator acknowledges that they haven't verified this detail and welcomes clarification from experienced plumbers.
Airflow Considerations: A crucial aspect of sanitary tee installation in vent systems is airflow. The video explains that vents are designed to allow air to flow freely out of the building, preventing pressure imbalances and ensuring proper drainage. The installation orientation of the sanitary tee significantly impacts airflow.
Two Scenarios for Vent Connections:
Vent Coming Up and Connecting: In this scenario, the sanitary tee should be installed upside down. This allows vent airflow to flow smoothly around the bend and continue upwards. If the tee were installed upright, airflow would encounter difficulty making the turn.
Another Vent Pipe Intersecting: Similar to the previous scenario, the sanitary tee needs to be installed with the outlet pointing upwards. This ensures proper airflow towards the outside of the house, preventing any trapped air or moisture within the system. An upside-down installation would hinder airflow due to the shape of the fitting.
Building Code Compliance and Additional Considerations:
Some plumbers might question the logic behind the upside-down installation for vent sanitary tees, because it seems counterintuitive compared to using a straight fitting that would allow a plumbing snake to be easily inserted for cleaning purposes. However, building codes often dictate specific installation methods, and in this case, the upside-down orientation is likely to ensure proper venting and airflow.
Bonus Tips:
Material Selection: Sanitary tees come in various materials like PVC, copper, and brass. Choose a material compatible with your plumbing system and local building codes.
Leak Prevention: Use plumber's tape, adhesive or pipe dope on the threads of the sanitary tee to ensure a watertight seal.
Secure Connections: When connecting pipes to the sanitary tee, tighten the connections securely using wrenches or pliers, but avoid over-tightening to prevent damage.
Double-Check Installation: Before finalizing the installation, ensure all connections are secure and there are no leaks.
By understanding the proper installation techniques for sanitary tees in drain and vent systems, you can ensure efficient drainage and proper airflow in your plumbing. If you're unsure about any aspect of the installation, it's always best to consult with a licensed plumber.
