Ultra-Rib-Style Access Risers
Orenco® Ultra-Rib-Style Access Risers (RR, RU, RPU) are used to provide access to tanks and enclose valves in water and wastewater systems. Bulk quantities are available.
- PVC construction
- Concentric rib design
- Available in 12-, 18-, and 24-inch (300-, 450-, and 600-mm) nominal diameters
- Heights available in 3-inch (76-mm) increments
- Bulk pipe available in 13-foot (3.96-m) sections for 18-inch (450-mm) nominal diameter pipe and in 14-foot (4.27-m) sections for 24-inch (600-mm) nominal diameter pipe
HOW TO SELECT
Step 1: Determine the diameter of the riser needed for your application:
- Simplex pump systems typically require a minimum 24in diameter access riser.
- Duplex pump systems typically require a minimum 30in diameter access riser.
- Residential Effluent filters typically require a minimum 18in diameter access riser.
Note: We recommend a 30-inch diameter riser for burial depths greater than 3 feet.
Step 2: Verify that the riser diameter is compatible with the riser tank adapter and tank hole size.
Step 3: Determine the height of the riser. The top of the riser should extend a minimum 3in above the finished grade level.
Note:: For new installations, this includes 2 inches for settling. For existing installations, only 1 inch above grade is necessary.
Step 4: Determine the splice box and grommet requirements. For grommets used with internal splice boxes, determine the nipple size being used, either 1-inch or 1 1/4-inch. Internal splice box models SB1 through SB4 require a 1-inch grommet. SB5 and SB6 require a 1 1/4-inch grommet. External splice boxes require a 4-inch grommet.