What is the difference between prestressed concrete lined cylinder pipe (L-301) and prestressed concrete embedded cylinder pipe (E-301)?
The manufacture of both Lined Cylinder Pipe and Embedded Cylinder Pipe are covered in the AWWA C301 standard. The difference between these two pipe types is based on how they are manufactured. There are no performance differences between the two. Lined Cylinder Pipe has the structural concrete core formed by spinning the steel cylinder and joint ring assembly and introducing fresh concrete inside. Centrifugal force causes the concrete to form in a layer on the inside surface of the steel cylinder. Once the concrete core has been cured, prestressing wire is helically wrapped onto the outside surface of the steel cylinder. The AWWA C301 standard allows the manufacture of this pipe in diameters 16″ through 60″. Embedded cylinder pipe is manufactured by placing the steel cylinder and joint ring assembly inside of a pair of vertical steel forms and introducing the concrete in from the top of the forms. The concrete fills the space both inside and outside of the steel cylinder. Once the conc
