Roxul Industrial Insulation Process - Manual (Page 86)

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fitted. Densities of at least 9.4 lb/ft 3 (150 kg /m 3 )
are feasible. The official requirement according to
the AGI Q118 standard is 10 to 12.5 lb/ft
3 (160 to
200 kg/m 3 ) . The procedure is outlined step by step
as follows:
1. Create a trial set up by filling a 2 x 2 x 2 ft (60 x
60 x 60 cm) crate with an evenly distributed
layer of loose wool, with a thickness of 12 to 16"
(300 to 400 mm). Then have a man of average
weight compact this layer by treading on it.
Repeat this process until the box is full.
Calculating the quantity of wool used (by mass)
afterwards allows the feasible density to be
determined. This also gives a good idea of the
tamping method required in order to achieve an
effective filling density.
2. Before starting to fill the cold box, fill the
installation with air to create a slight over-
pressure. This will make any possible leaks,
which can occur during the tamping process,
audible.
3. The cold box is filled with an evenly distributed
layer of ProRox ® GR 903 granulate, with a
thickness of 12 to 16" (300 to 400 mm). Tamp
down this layer until a density is reached that
corresponds to the density in step 1.
4. Repeat step 3 until the cold box is completely
filled. Check the filling density by regularly
calculating the mass used in relation to the
filled volume. The pressure required to achieve
a certain density depends on the procedure that
has been followed.
Note
As ProRox
® GR 903 Granulate may settle after
a while or the shape of the cold box may alter
due to temperature fluctuations, take into
account that the unit will need to be refilled.
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