For Reduced Pressure Principle Assemblies: Installed upright horizontal - aboveground outside zoning setback according to Charlotte Water standard details; minimum height from relief port to the ground is 12" and maximum is 30" inside a building or partially buried vault (special approval needed).
Size: Minimum Clearance
¾"-2", 30" from wall or any obstruction on the side utilized for testing and 6" from other side.
2½" -12", 30" from wall or any obstruction on the side utilized for testing and 12" from other side.
All: 4" from wall to shut off valve.
All: Floor drain or air-gap drain.
For Double Check Valve Assemblies:
- Must be Installed upright and horizontal - above or below ground; outside zoning setback if above ground according to Charlotte Water standard details.
- If below ground, device must be installed in vault with a concrete or stone bottom and provide for drainage to free atmosphere.
- Minimum height from bottom of the assembly to the ground is 12" and the maximum is 30".