Underground Construction - October 2022 - 23
EDITION 78 | OCT 2022 | NASSCO.ORG
A portion of coating material was inserted between
the two chambers, and the vial was then placed in
storage for several days. When ready, the styrene
content in the upper chamber was tested in a gas
chromatograph (GC).
For Stage 2, a chest freezer was retrofitted to
simulate a refrigerated storage unit. Fifteen-foot
lengths of 8-inch tube were wet-out and placed
inside the storge unit with the temperature set to
simulate working storage units. Styrene level
measurements inside the storage unit were recorded
over time using photoionization detectors (PIDs) to
collect gas samples by ports through the freezer
wall. The aim for Stage 2 was to create a
mathematical model or chart showing emission
concentration versus time for different wet-out tube
parameters such as quantity of resin, tube surface
area, type of coating and so on.
Stage 3 involved two field visits where TTC
technicians collected styrene level measurements
inside working refrigerated storage units and outside
with doors open. During both visits, TTC monitored
a storage unit for several days in Florida and
Wisconsin as wet-out tubes were loaded, removed,
and installed.
.
In both instances, a baseline styrene level was
established prior to loading. Styrene concentration
data inside the storage units was monitored by two
(2) specially fitted data logging PIDs located in the
truck cab and powered by the truck's electrical
system. Styrene concentration data outside the
storage units was monitored by a handheld PID
when the doors were open. Stage 3 was to validate
the model developed in Stage 2 and provide
guidance to field crews on what levels of styrene
can be expected in and outside storage units.
TTC is currently collecting and evaluating data from
the PIDs and preparing the report. A draft copy for
review is expected in late October, with the final
report available when all peer reviews have been
completed. For the most current updates and other
vital safety information, please visit NASSCO.org/
Safety.
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Underground Construction - October 2022
Table of Contents for the Digital Edition of Underground Construction - October 2022
Contents
Underground Construction - October 2022 - Cover1
Underground Construction - October 2022 - Cover2
Underground Construction - October 2022 - Contents
Underground Construction - October 2022 - 4
Underground Construction - October 2022 - 5
Underground Construction - October 2022 - 6
Underground Construction - October 2022 - 7
Underground Construction - October 2022 - 8
Underground Construction - October 2022 - 9
Underground Construction - October 2022 - 10
Underground Construction - October 2022 - 11
Underground Construction - October 2022 - 12
Underground Construction - October 2022 - 13
Underground Construction - October 2022 - 14
Underground Construction - October 2022 - 15
Underground Construction - October 2022 - 16
Underground Construction - October 2022 - 17
Underground Construction - October 2022 - 18
Underground Construction - October 2022 - 19
Underground Construction - October 2022 - 20
Underground Construction - October 2022 - 21
Underground Construction - October 2022 - 22
Underground Construction - October 2022 - 23
Underground Construction - October 2022 - 24
Underground Construction - October 2022 - 25
Underground Construction - October 2022 - 26
Underground Construction - October 2022 - 27
Underground Construction - October 2022 - 28
Underground Construction - October 2022 - 29
Underground Construction - October 2022 - 30
Underground Construction - October 2022 - 31
Underground Construction - October 2022 - 32
Underground Construction - October 2022 - 33
Underground Construction - October 2022 - 34
Underground Construction - October 2022 - 35
Underground Construction - October 2022 - 36
Underground Construction - October 2022 - 37
Underground Construction - October 2022 - 38
Underground Construction - October 2022 - 39
Underground Construction - October 2022 - 40
Underground Construction - October 2022 - 41
Underground Construction - October 2022 - 42
Underground Construction - October 2022 - Cover3
Underground Construction - October 2022 - Cover4
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