Sliplining Made Easy: Worcester, MA Uses FPVC® Pipe to Rehabilitate 24" PCCP Force Main

After several failures on a critical section of an aging sewer force main under busy Lake Avenue and State Route 9, the City of Worcester, MA knew it was time to implement a permanent solution for the 24" pre-stressed concrete cylinder pipe (PCCP). After considering various design alternatives with CDM Engineering, the City elected to slipline the PCCP force main with 20" FPVC® pipe.

In January 2009, Ricciardi Brothers Construction of Worcester, MA was selected in a competitive bid to perform the sliplining work. Underground Solutions, Inc. (UGSI) contracted with Ricciardi Brothers to provide UGSI's FPVC® pipe and fusion services for the project. The entire 4,480 LF length of the PCCP force main was sliplined using only three segments of FPVC® pipe, each pulled in via entry pit locations selected to minimize excavation. The City of Worcester accepted the pipeline after a successful two-hour pressure test at 150 psi.

Commenting on the project, Mr. Jim Ricciardi noted: "The FPVC® pipe was easy to handle, easy to pull, and did not require any relaxation period before we could work on it. UGSI performed several intermediate fusions due to limitations on available pipe layout area. Fusible PVC® pipe creates some interesting opportunities to expand the use of sliplining due to its pressure capability, good inside diameter, and long pull distances."

Pipeline Details and Project Summary
  • Project:
  • Location:
  • Length:
  • Pipe size:
  • Slipline Segments:
  • Pressure Test:
  • Lake Ave and State Route 9 Sewer Force Main
  • Worcester, MA
  • 4,480 LF
  • 20" DR18 FPVC®
  • (3): 1,750 LF, 1,360 LF and 1,230 LF
  • 150 psi for 2 hours

According to CDM's Neill Hampton, P.E. and lead engineer for the project: "FPVC® pipe was the best option to maximize the hydraulic capacity of the force main for our client while maintaining a high pressure capability."