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Short Pipe Replacement Process

In-situ replacement of small-diameter drainage pipes using HDPE short pipes

Overview

The Short Pipe Replacement Process explained

Short Pipe Replacement is a hybrid trenchless method that replaces aging small-diameter drainage pipes with new solid-wall polyethylene short pipes. A specialized cutting head fractures the existing pipe while new HDPE pipes are pushed in synchronously behind it.

Working principle

In-well or surface-based equipment guides a cutting assembly to the terminal manhole of the targeted pipe section. A specialized cutting head is installed at this terminal manhole; rotation cuts and fractures the existing old pipeline. Simultaneously, new pipe segments — solid-wall polyethylene short pipes featuring expansion-lock sealing connections — are installed immediately behind the cutting head and thrust forward in synchronization. Installation of the new pipeline proceeds concurrently with cutting, sequentially replacing the old pipe back toward the starting manhole.

Short Pipe Replacement Process
Step-by-Step

Process Stages

From pre-installation inspection through post-cure acceptance — here's the full project workflow.

Pre-Survey

CCTV inspection confirms pipe condition and replacement scope.

Cutting Head Setup

Specialized cutting head installed at terminal manhole.

New Pipe Loading

HDPE short pipes with expansion-lock joints staged at starting manhole.

Synchronous Operation

Cutting head rotates to fracture old pipe; new pipes thrust forward simultaneously.

Joint Locking

Each new pipe segment expansion-locks into the previous segment.

Completion

Process completes when reaching the starting manhole.

Acceptance

CCTV verification of new pipe integrity.

Why this method

Key advantages

  • Full pipe replacement (not just liner)
  • Possible to upsize during replacement
  • New HDPE pipe with expansion-lock seal
  • Synchronized cutting + installation in single operation
  • Suitable for new municipal drainage construction too
  • No major excavation required

Is Short Pipe Replacement right for your project?

Send your pipe diameter, length, and host material — our engineers will recommend the optimal method for your specific project conditions.

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