Page 131 - Trenchless Technology Piping Installation and Inspection

Coatings and Linings for Potable W ater Pipe Distributions 97

• Types and locations of appurtenances such as valves, fittings,
and fire hydrants
• Number and type of service connections
• Length of time the pipe can be out of service or bypass
requirements
• Site- and project-specific factors (surface and subsurface
conditions)
• Overall cost of the renewal method (material and installation)

3.4 Installation Phases of Coatings and Linings
The successful installation of coatings and linings depends on many
factors such as transportation of lining material from shop to the
project site, ambient temperatures at the site, and cleanliness of the
internal surface of the existing pipe as well as existing pipe condi-
tions, geometry, alignment, and defects. Among these parameters,
the most important factor is the proper installation technique as
shown in Fig. 3.3. Figure 3.3 illustrates the various steps and sequences
for successful coating and lining installations. Further details on
these steps are provided in the following sections.

Coatings & linings
process

Phases
I II III IV
Preparatory
Divisions Planning Lining Closeout
work
Site Entry access Conditioning of Reconnections
preparation point preparation lining & reinstatement
of service
Condition Cleaning & Installation
assessment inspection of lining Backfilling
Material Coupon/sample Surface
selection collections restoration
Activities
Equipment Curing Site cleaning
readiness
Post-lining Waste
Potholing
inspection disposal
Testing
Traffic Quality
diversion Disinfection control
Sampling
Delivery &
Flushing
documentation
FIGURE 3.3 Steps and sequences for coatings and linings. (Source: 3M Water
Infrastructure.)