TABLE OF CONTENTS The sliplining of sewers with PE pipe is a fine way to rehabilitate old sewers. By inserting PE pipe in old sewers you can create a new, smooth, watertight interior surface that is far less prone to problems. Standard procedure is to have a continuous length of watertight lining extend from one manhole to the next.
Polyethylene material used to manufacture pipe and fittings for sliplining is either a high-density polyethylene or a minimum polyethylene. These materials must meet or exceed the minimum requirements for cell class 334433 or cell class 234333, respectively, in accordance with ASTM D 3350. Check all ASTM standards prior to making an installation.
There are several considerations that must be reviewed prior to the sliplining procedure. You will need to establish the minimum anticipated clearance that will exist between the lining material and the existing sewer pipe. Flow capacity is another factor to establish. Will there be external loads on the pipe? What will the earth load be? Is hydrostatic pressure expected? Internal pressure and construction loads are additional considerations. How will structural support of the pipe be creating with grouting?
When large sewers are to be lined, they can be examined with video cameras. When you can t gather visual data, it is generally acceptable to plan on a lining diameter that is approximately 10 percent smaller than the diameter of the existing sewer pipe. A difference of five percent is sometimes acceptable when the sewer pipe has a minimum diameter of 24 inches.
