106-AN grout pilot-scale test HGTP-93-0501-02 Page: 48 of 151
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waste inlet temperature was quite constant over the entire run at 470C, and
the grout in the surge tank had a constant temperature of 430C.
The temperature of the grout near the pipe discharge was slightly more
variable and ranged from a high of 430C to a low of 37*C, with the average
temperature of the grout (excluding down time) being 40.7CC. Part of the
temperature variability could be due to the programmed flush, which occurred
every 10 minutes during the main grout production run. If the data logger
took the data point right after the cold process water was added to the pump
inlet, the temperature of the grout at the discharge would dip slightly. The
discharge temperature of the grout produced after the shutdown shows
significant temperature dips every 10 minutes.
4.1.5 Grout Mix Ratio
Figure 4.7 shows how the grout mix ratio varied during the pilot-scale
run. While processing the nominal mix ratio of 8.7 lb/gal, the mix ratio
always stayed well within the allowable 0.5 lb/gal. Between 144 and 194
minutes of elapsed run time, the grout ratio was changed to investigate grout
production in the upper portion of the allowable operating window. Grout
processing was not significantly different during this time frame, which
indicated that the upper portion of the acceptable operating window could be
mixed and pumped without operational problems. The average mix ratio for the
entire grout run after accounting for the water added with the timed rinse was
8.79 lb/gal.
4.1.6 Final Rinse Procedure
Twenty-five gal of water were used to rinse the grout mixer, surge tank,
grout pump, and the grout pipe leading to the lift mold. The water was pumped
through the grout pipe at a rate of 10 gpm. The water from this rinse (minus
the 3 to 4 gal that remained in the pipe) was placed on top of the first lift
of grout in the lift mold. An additional 10 to 15 gal of water were
recirculated through the pilot-scale equipment for 10 minutes using the
decontamination/rinse system. This rinse water was pumped to the dumpster.
After rinsing, the drop chute penetration into the gradient mold was
plugged with insulation, and the lift mold inspection port was sealed. The
lids on the 55-gal drums were also replaced and sealed.
4.4
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Bagaasen, L. M. 106-AN grout pilot-scale test HGTP-93-0501-02, report, May 1, 1993; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1319387/m1/48/?rotate=0: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.