Page 145 - Trenchless Technology Piping Installation and Inspection
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Coatings and Linings for Potable W ater Pipe Distributions 111
FIGURE 3.9 Polyurea application does not plug service laterals.
provide long-term corrosion protection and have excellent abrasion
resistance.
Figure 3.10 illustrates the spray head for polyurea lining appli-
cation. Table 3.7 represents advantages and limitations of polyurea
linings.
3.16.4 Polyurethane
Polyurethanes were first used in the mid 1970s in North America
to seal underground fuel tanks from corrosion. During the same
time it was used in Europe to protect oil and gas pipelines. With
