Page 338 - Trenchless Technology Piping Installation and Inspection

typically be detected in extremely small quantities and may be detected at the manhole openings
the atmosphere, styrene will dissipate very quickly. When an odor is detected it should normally
The resin component of the CIPP is typically a styrene-based material. The odor of styrene can
styrene can be readily detected at levels of 1–2 parts per million (ppm) or less. The threshold
for continuous exposure to styrene in a confined factory setting is 50 ppm. When exposed to
and sometimes it will migrate into a home if the home’s trap is defective. The presence of
dissipate in a matter of several hours and should not present a harmful environment for
Cutout the exothermed section and, if possible, use this liner in another pipe.
Discard liner and furnish a new liner for installation.
to eliminate the odors. personnel in the vicinity of the installation. If styrene odors are detected in a residence, ventilate

• • • Inspector Action on Various Operations (Continued)

Liner is not properly or sufficiently iced down at the folds in the liner during transport in the refrigerated container (premature exotherm) Odors Source: NASSCO TABLE 7.7

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