Introduction

Sliplining and robotic tap cutting (robotic lateral reinstatement) are two essential trenchless technologies for pipeline rehabilitation, especially within aged water, wastewater, and stormwater infrastructure. Hinterland Group specializes in delivering these solutions to municipal, commercial, industrial, and property management partners across the southeastern United States. Their approach integrates comprehensive cleaning, advanced CCTV inspection, and the expert application of sliplining—followed by robotic lateral reinstatement where required—for efficient, cost-effective, and highly durable pipeline renewal.

What is Sliplining?

Sliplining is a trenchless pipeline rehabilitation technique that involves inserting a new, smaller-diameter pipe (the "carrier pipe") into an existing host pipe. The annular space between the new and old pipes is typically grouted to secure the new liner in place and prevent infiltration. This method is well-suited for pipelines with significant structural deterioration but continuous alignment.

Typical Sliplining Materials:

High-Density Polyethylene (HDPE)
Fiberglass Reinforced Pipe (FRP)
Polyvinyl Chloride (PVC)

Primary Uses:

Gravity sewer mains
Stormwater culverts
Water transmission lines

See more: Pipe Rehabilitation Services

Sliplining for Pressure and Gravity Lines

Hinterland delivers sliplining solutions for both gravity systems (sanitary sewer, stormwater) and pressure pipelines (water transmission and force mains), enabling structural renewal with minimal surface disruption.

Materials and Typical Uses

HDPE carrier pipe for long, continuous runs and curved alignments
FRP pipe for high-stiffness structural renewal in larger diameters
PVC pipe for straight runs and compatible host geometries

Applied across:

Gravity: sanitary sewer mains, interceptors, culverts, drainage crossings
Pressure: potable water mains and wastewater force mains

Recent project examples demonstrate range and capability across diameters and service types:

Pressure mains: Indian River Water Main & Force Main; FPUA force main work (FPUA/Force Main)
Gravity/Stormwater: Charlotte County stormwater system rehabilitation (Charlotte County)

Hydrostatic Pressure Testing Workflow (Pressure Pipelines)

For pressure pipelines renewed via sliplining, Hinterland performs pressure testing in accordance with owner/utility specifications and project documents. A typical workflow includes:

Isolation and temporary bypass (as required to maintain service).
Segment preparation: install end caps/blinds, air/vacuum release, and test appurtenances.
Controlled fill and air expulsion to eliminate entrapped air.
Stabilization/soak period prior to formal testing, per specification.
Hydrostatic test: pressurize to specified test pressure; hold for the required duration while monitoring pressure and leakage in accordance with acceptance criteria.
Documentation: pressure logs, test certificates, and post-test verification (e.g., CCTV for adjacent gravity segments) delivered with as-built records.

Quality Controls for Sliplining Installations

Annular space grouting to secure the carrier pipe and prevent infiltration/exfiltration
Engineered transitions and restrained connections at tie-ins
Service/lateral reinstatement via robotic tap cutting where applicable (gravity systems)
Comprehensive post-installation reporting and video deliverables

If sliplining is not the optimal method for a given segment, Hinterland evaluates alternatives (CIPP, pipe bursting, geopolymer spincast) and provides a best-value recommendation based on hydraulics, constructability, downtime, and lifecycle cost.

What is Robotic Tap Cutting (Robotic Lateral Reinstatement)?

After installing any tight-fitting liner within a main pipeline (such as sliplining or CIPP), existing service connections ("taps" or "laterals") become covered. Robotic tap cutting uses remotely-operated cutting heads, navigated via CCTV, to accurately locate and reopen ("reinstate") these connections from inside the new pipe, restoring full connectivity for residences and businesses.

Robotic lateral reinstatement is critical for:

Maintaining sewer lateral service in residential and commercial areas
Restoring stormwater inlets
Minimizing excavation and above-ground disruption

Learn more about robotic operations in pipeline assessment

Sequencing with Cleaning and CCTV Inspection

Hinterland Group’s PRIME methodology incorporates a sequenced approach to ensure the success of sliplining and robotic reinstatement:

Pipeline Cleaning
Utilizes high-volume vactor trucks and jetting equipment to remove debris, roots, mineral scale, and obstructions.
Ensures the host pipe is accessible for both CCTV inspection and lining operations.
See cleaning services
CCTV Pipeline Inspection
State-of-the-art robotic CCTV cameras document the interior condition.
Pinpoints structural failures, obstructions, offset joints, infiltration, and all active laterals.
Provides precise measurements for liner design and reinstatement mapping.
More about inspection
Engineering Evaluation & Design
Assess suitability for sliplining versus alternatives (CIPP, pipe bursting, SIPP).
Develop a reinstatement plan for all taps encountered.
Conducts risk/reward and value assessment.
Sliplining Installation
Sections of the liner pipe are pulled or pushed into the host pipe via access pits or manholes.
Lateral services are temporarily bypassed (if needed).
Annular space is grouted.
Robotic Lateral Tap Cutting
After liner curing, robotic cutting equipment reopens all mapped service connections through the liner.
Quality is verified via post-reinstatement CCTV.
Final Cleaning & Post-Inspection
Ensures all connections are open and the mainline is free-flowing.
Delivers a digital deliverable and report for the client.

Diagram of Common Sequencing for Gravity Sewer Rehabilitation

Pipe Cleaning → 2. CCTV Inspection → 3. Sliplining → 4. Robotic Lateral Reinstatement → 5. Post-Inspection

Pros and Cons

Sliplining

Pros	Cons
Most cost-effective where upsizing is not needed	Reduces internal diameter & capacity
Fast to install with minimal open-cut	Not suitable for pipes with major misalignment
Highly durable (50+ year materials)	Difficult in complex layouts or with many bends
Minimal surface disruption	Grouting annular space adds complexity
Effective for long continuous runs	Not suitable if taps need critical upsizing

Robotic Tap Cutting

Pros	Cons
Minimizes excavation—no digging to restore taps	Not feasible in pipes with collapsed laterals
Reinstates taps quickly, often same day as lining	May not access all taps if pipes are highly offset or blocked
High precision, accurate via CCTV verification	Equipment/robotics require specialized labor
Can be performed remotely, even in wet pits	Potential re-entry challenges in corroded/fragile lines

Typical Scenarios Where Sliplining and Robotic Tap Cutting Are Utilized

Aging municipal sewer mains: Lines with cracking, infiltration, or minor offset joints but continuous alignment
Stormwater culvert rehabilitation: Corrugated metal pipes or reinforced concrete pipe rehabilitation beneath roadways
Industrial pipeline renewal: Clean water or process mains in plant environments where downtime and excavation must be minimized
Service areas with challenging access: Locations with minimal right-of-way or high community impact (e.g., busy corridors, urban centers, airports) see markets served
Emergency situations: Where rapid restoration is essential and CIPP lining is not appropriate due to diameter loss, sliplining offers immediate structural renewal. Case studies: Charlotte County Stormwater

Features & Benefits of Hinterland Group's Approach

All technologies in-house: Ensures tight quality controls and cost efficiency (source)
24/7 emergency response: Rapid mobilization for critical infrastructure failures (source)
Cross-trained crews: Ability to sequence cleaning, CCTV, sliplining, and robotic cutting without outside contractors
Safety-first culture: Full-time Safety Manager and industry-leading EMR safety scores (source)
Detailed reporting: Comprehensive digital documentation of before-and-after pipe conditions
Experience: Decades of work with municipalities, property managers, industrial clients across Florida and the Southeast

Use Cases and Project Types

Municipal

Sewer main and lateral renewal with minimal service disruptions
Large-diameter stormwater culvert replacement

Industrial

Process water renewal under active facilities

Residential/HOA

Lateral lining and reinstatement for private community sewers

Commercial/Commercial Property

High-traffic road crossings, shopping center main renewal, service lateral reinstatements

Frequently Asked Questions (FAQ)

What is the difference between sliplining and CIPP?

Sliplining inserts a new pipe into the host; CIPP creates a new pipe within the old by resin-impregnated felt or fiberglass cured-in-place. Sliplining typically reduces capacity slightly but uses pre-manufactured materials, while CIPP closely conforms to the host ID and is often preferred for more complex geometries (see our CIPP Services).

How does the robotic tap cutting process work?

After the new liner is installed and cured, a robotic cutter—led by a CCTV camera—moves down the mainline, precisely locating and reopening each lateral connection by removing the liner material blocking it. Verification is documented for owner records (detailed at Hinterland Careers – Tap Cutters).

When is sliplining NOT recommended?

If a significant diameter reduction is unacceptable, if the host pipe has sharp bends, collapsed pipe, or major offsets/misalignment. In these scenarios, pipe bursting, CIPP, or open-cut may be better suited. (Pipe Rehabilitation Decision Matrix)

Does robot cutting restore all laterals?

In most cases, yes; however, if laterals are collapsed or otherwise inaccessible from the mainline, small spot excavations may be necessary ( rare in standard gravity sewer projects with good pre-CCTV inspection).

What role does cleaning play in the process?

Cleaning is essential to remove all debris and ensure that both the lining and robotic cutters can access the full pipe extent. Skipping cleaning can result in liner defects or missed tap reinstatements. (Learn about our cleaning and maintenance)

How quickly can Hinterland mobilize for repairs?

Hinterland Group provides documented 24-hour or less mobilization throughout their service area and 15-minute guaranteed emergency callback (source).

Summary Table: Sliplining & Robotic Tap Cutting Overview

Aspect	Sliplining	Robotic Tap Cutting
Main Purpose	Structural renewal	Reinstatement of lost taps
Typically Used For	Gravity mains, culverts, force mains	Services (laterals) to buildings
Pre-requisite	CCTV, cleaning, design	Liner installation complete
Skills/Equipment Needed	Pipe pulling/jacking crew, grouting	CCTV, robotic cutter, tap map
Hinterland In-House?	Yes	Yes

Why Choose Hinterland Group for Sliplining Projects?

Single-source solution for cleaning, inspection, lining, and reinstatement
In-house specialty tap cutting crews, minimizing wait and cost
Experience with urban, industrial, HOA, and airport projects
Safety, rapid mobilization, and detailed QA documentation

Related Hinterland Group Case Studies

Links and Resources

For more information about sliplining, robotic tap cutting, or any trenchless rehabilitation technology, contact Hinterland Group at info@hinterlandgroup.com or visit our contact page.

Sliplining and Robotic Tap Cutting: Scenarios and Sequencing