The screen analysis indicated only a small change in the distribution of
large particles. Influences of recirculation effects on friction
loss results were not observed.
With the crushed rock product mentioned in Table 1, the
concentration was increased in steps by adding fresh solids.
The average exposure time was about 1 h. The degradation
pattern was not followed up in detail. However, it is expected
that rounding of coarser particles caused a decrease of dso
and an increase of the finer fractions.
The tar sand railings and granite rock tests were carried out
in the largest loop at the GIW Hydraulic Testing Laboratory.
Pipelines with lengths of 60-90 m and diameters of 0.39, 0.44
and 0.49 m are installed in series. The flow rate was obtained
from a magnetic flow meter and a pipe elbow meter. A vertical
inverted U-loop and a nuclear densitomeler were used for
slurry density measurements. Tar sand tests were carried out
at volumetric solids concentrations exceeding about 20%
with an exposure time in the loop of about 90 rain. Granite
rock was then loaded into the system, a procedure that lasted
for about 50 min. The data used here were then generated
during 35 min. The size distribution of the tailings remained
fairly stable with a small increase in the lines ( -75 p,m)
content. The coarse rock particles were degraded and rounded
during circulation in the loop.
The evaluation of data for the tar sand railings and granite
rock tests was limited to the 0.39 and 0.44 m i.d. pipelines,
giving reliable results at velocities sufficiently high for stable
operating conditions without permanent or temporary depo-
sition in the pipes. According to criteria given by Clift and
Cliff [ 17 ] for the vertical inverted U-loop, measured densities
should correspond to delivered values for the data used here.
Slurry densities determined by means of the inverted U-loop
and the nuclear densitometer approximately coincided.
The screen analysis indicated only a small change in the distribution of
large particles. Influences of recirculation effects on friction
loss results were not observed.
With the crushed rock product mentioned in Table 1, the
concentration was increased in steps by adding fresh solids.
The average exposure time was about 1 h. The degradation
pattern was not followed up in detail. However, it is expected
that rounding of coarser particles caused a decrease of dso
and an increase of the finer fractions.
The tar sand railings and granite rock tests were carried out
in the largest loop at the GIW Hydraulic Testing Laboratory.
Pipelines with lengths of 60-90 m and diameters of 0.39, 0.44
and 0.49 m are installed in series. The flow rate was obtained
from a magnetic flow meter and a pipe elbow meter. A vertical
inverted U-loop and a nuclear densitomeler were used for
slurry density measurements. Tar sand tests were carried out
at volumetric solids concentrations exceeding about 20%
with an exposure time in the loop of about 90 rain. Granite
rock was then loaded into the system, a procedure that lasted
for about 50 min. The data used here were then generated
during 35 min. The size distribution of the tailings remained
fairly stable with a small increase in the lines ( -75 p,m)
content. The coarse rock particles were degraded and rounded
during circulation in the loop.
The evaluation of data for the tar sand railings and granite
rock tests was limited to the 0.39 and 0.44 m i.d. pipelines,
giving reliable results at velocities sufficiently high for stable
operating conditions without permanent or temporary depo-
sition in the pipes. According to criteria given by Clift and
Cliff [ 17 ] for the vertical inverted U-loop, measured densities
should correspond to delivered values for the data used here.
Slurry densities determined by means of the inverted U-loop
and the nuclear densitometer approximately coincided.
การแปล กรุณารอสักครู่..

The screen analysis indicated only a small change in the distribution of
large particles. Influences of recirculation effects on friction
loss results were not observed.
With the crushed rock product mentioned in Table 1, the
concentration was increased in steps by adding fresh solids.
The average exposure time was about 1 h. The degradation
pattern was not followed up in detail. However, it is expected
that rounding of coarser particles caused a decrease of dso
and an increase of the finer fractions.
The tar sand railings and granite rock tests were carried out
in the largest loop at the GIW Hydraulic Testing Laboratory.
Pipelines with lengths of 60-90 m and diameters of 0.39, 0.44
and 0.49 m are installed in series. The flow rate was obtained
from a magnetic flow meter and a pipe elbow meter. A vertical
inverted U-loop and a nuclear densitomeler were used for
slurry density measurements. Tar sand tests were carried out
at volumetric solids concentrations exceeding about 20%
with an exposure time in the loop of about 90 rain. Granite
rock was then loaded into the system, a procedure that lasted
for about 50 min. The data used here were then generated
during 35 min. The size distribution of the tailings remained
fairly stable with a small increase in the lines ( -75 p,m)
content. The coarse rock particles were degraded and rounded
during circulation in the loop.
The evaluation of data for the tar sand railings and granite
rock tests was limited to the 0.39 and 0.44 m i.d. pipelines,
giving reliable results at velocities sufficiently high for stable
operating conditions without permanent or temporary depo-
sition in the pipes. According to criteria given by Clift and
Cliff [ 17 ] for the vertical inverted U-loop, measured densities
should correspond to delivered values for the data used here.
Slurry densities determined by means of the inverted U-loop
and the nuclear densitometer approximately coincided.
การแปล กรุณารอสักครู่..
