How to Install the Riser in a Polyethylene Gas Line


Installing a riser in a polyethylene pipeline can be done in a number of ways depending on how you want to transition from metal to plastic. A steel riser is typically fused to plastic on one end and then plumbed into steel fittings on the other. Risers allow for metal connections above ground for the plastic pipe, which is below.

Things You'll Need

  • Riser
  • Fusion equipment or flange
  • Piece of pipe
  • Cutters
  • Threaders
  • Union
  • Connect the polyethylene pipe to the fitting used to convert to steel. A metal to plastic transition or flange can be used with a butt or socket fusion machine. This machine consists of a cradle and a trimmer and hot plate.

  • Screw the transition and the pipe into the cradle with a 2-inch section of each inside the clamps. Insert the trimmer and trim both ends until they fit together with no gaps. Pull the trimmer out of the cradle and insert the hot plate. Push both pieces in the cradle up against the hot plate and allow them to melt for 30 seconds. Pull apart the cradle and remove the hot plate. Push the two soft plastic ends together in the cradle and allow a few minutes for the two to fuse together.

  • Once the fusion is set, remove the cradle and place the riser where it will stay. Then measure the distance from the riser to the next connection. This connection will go from the metal part of the riser to the metal part of the next riser.

  • Thread a short nipple and union in one fusion end. Cut and thread a longer piece of pipe to span the distance from the riser with the union end to the other riser and thread and connect the pipe to complete the riser connection.

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