Installation is Straightforward Our standard units are designed to be installed with simple tools. A drill or impact driver with a 5/16 socket is required. A 9/16- inch socket is required to attach options. No concrete or welding are required.
Prepare the area in front of the drain tile to receive the bottom section. The soil should be packed firmly to minimize settling.
Bolt the optional support frame and/or debris screen to the corresponding anchor points on the box using the hardware supplied
Slip the skirt on the bottom section of the box into the inside of the plastic drain tile. Check the fitment of the tile to the base and adjust as required. Do not force or deflect the drain tile to force the connection.
Ensure the box is upright and level in both directions. If the optional support frame is used, adjust the length of the struts if required.
If desired, drive rebar earth anchors through the base to secure the unit.
Install the pipe following the instructions below.
Place the flashboards into the box
Backfill as desired ensuring that large rocks or clumps of earth do not damage the pipe, box or support frame.
Mounting the Pipe is Simple. The nipple on the back of the riser is formed to provide a slip-fit for the designated pipe diameter.
Slide the pipe over the nipple and position the supplied cleat on the side as shown. Using a powered screwdriver or drill with a 5/16 socket, drive the supplied self-drilling screws through the pipe and into the nipple as shown in the video. We recommend starting with the center two screws then the outer screws. Repeat on the opposite side using the second cleat.
These cleats provide a robust connection that will not easily rip out or tear the pipe. The cleats can optionally be mounted by bolts extended from the inside of the nipple if you prefer not to have the points of the self-drilling screws extending into the pipe. Simple drill holes and place bolts from the inside and fasten the cleats with nuts.
The bell-end of the pipe will be very loose on the nipple. Simply cut the bell off just before the first rib for a nice fit.
Sealing Large Diameter HDPE Pipe Connections
Our in-line units are provided with sealed couplings. Even with properly sized couplings, achieving a truly watertight seal is difficult with corrugated pipe couplings. The seal is not critical on the outlet side because the coupling is not under pressure. Leaking can be a problem on the inlet side of an in-line structure if the seal is not watertight. The problem is magnified on taller structures with more head pressure. An optional step involves applying an adhesive between the pipe and the inlet sleeve on our in-line unit. Few adhesives adhere well to polyethylene. We recommend a liberal coating of Dupont (formally Dow) U-418HV, U-428HV or U-438HV urethane adhesive on the inlet sleeve prior to final installation of the pipe. These single-part adhesives cure into a tough but pliable urethane rubber. The glue does not truly bond to the HDPE pipe but it makes a great form-fitted gasket. Use caution because these adhesives are tenacious and are hazardous. They make a mess of everything they inadvertently touch. They do not wash off. Wear disposable gloves and protective clothing. Follow the manufacturer’s instructions and wear the appropriate PPE.