TM 5-814-9
light tracked vehicles in a dual-purpose lane. It Will take longer
wash, as shown on figure 3-4, and following the
to process a tracked vehicle in dual-purpose lane than in a
same logical steps used to size the prewash.
tracked lane, since the flexors in a dual-purpose lane are not as
Sizing without a prewash. If no prewash is pro-
effective as those in a tracked lane at removing the embedded
(2)
soil from the tracks.
vided, the planner predicts the number of wash
stations needed based on, soiling conditions and
42 heavy tracked
65 light tracked
0.93 1.03
process rates.
5 veh/hr/lane x 9 hr
7 veh/hr/lane x 9 hr
(a)
The process rate for vehicles at the wash sta-
tions will depend on several factors, but usu-
= 1.96 tracked lanes
ally will be between 1 and 10 vehicles per
hour. This range is given to allow an adjust-
125 heavy tracked
23 light tracked
1.26 0.51
ment for the vehicle types and soiling index at
5 veh/hr/lane x 9 hr
11 veh/hr/lane x 9 hr
the site. Installations that have vehicles soiled
Two tracked vehicle lanes and two dual-purpose lanes would
with large amounts of cohesive soils (clays)
offer a more efficient use of the bath than would the results
will have slower processing rates than those
given by the first calculations.
with only noncohesive soils (sand) or dust on
the vehicles. By using the Soiling Index (Si) in
Automatic washers. The types and number of
(2)
conjunction with the processing rate chart
vehicles in the motor pool must be considered in
shown on figure 3-4, the throughput can be
sizing the automatic wash area. Administrative-type
determined for each vehicle type. The mission
vehicles in a TMP usually return one at a time and
of the installation also will affect the process
are washed as they return. Thus, large numbers of
rate. At some installations, vehicles may re-
units will not be waiting to be washed in a limited
turn to the motor pool immediately for inspec-
amount of time as is the case with tactical vehicles
tion. In this case, the processing rate will be
at CVWFs. Civilians usually are employed to do the
slower than if the vehicle were not being
washing at TMP wash facilities; therefore, all of the
inspected, since the troops will most likely
daily washing normally will occur during an 8-hour
perform a detailed washing. Less time will be
period during daylight. A one-or-two position
taken to clean the vehicles if they will be
automatic prewash unit may be all that is required.
returned directly to the field for further train-
Again, number of vehicles per cycle and average
ing.
time of washing are used to determine the size of
(b)
Number of wash stations. The number of
the prewash unit.
tracked and wheeled vehicles to be washed is
c. Wash stations. Before sizing the facility, with or without
used in equation 34 to estimate the number of
a prewash, the designer must have a clear understanding of the
wash stations needed at a facility:
installation's washing requirements. The number of stations
needed at the wash facility will depend on whether a prewash
system is provided. A prewash will lessen the time that these
vehicles must spend at the wash stations, thus reducing the
number of stations needed.
Sizing with a prewash. When a bath prewash is
(1)
The user's requirements will determine how this number should
provided, the number of wash stations should be
be rounded. If the maximum washing time is critical, the
between two and five per tracked vehicle bath lane.
number should be rounded up; otherwise, it should be rounded
A process rate of 3 to 6 vehicles per hour at each
to the nearest whole number.
wash station can be expected after the vehicles have
3-2. Siting
been washed in the bath. Since all vehicles will not
go through the prewash bath, calculations of lanes
a. Geography. All future development and land uses at the
must account for longer wash times for these ve-
installation must be considered when siting a CVWF. These
hicles. A process rate of 2 to 4 vehicles per hour for
future plans must not adversely affect the vehicle and equipment
large, odd shaped, or tandem units can be expected.
movement inside and outside the facility. At the same time, the
A process rate of 4 to 10 vehicles per hour for small
facility must not interfere with activities in the cantonment and
wheeled vehicles such as jeeps or tons can be
training areas and vice-versa; the land uses should be
expected. Installations with a limited washing time
compatible. Vehicle noise and movement must not interfere
or a large percentage of wheeled vehicles to wash
with family housing, hospitals, and other installation activities.
will require more wash stations. In any case, the
If night washing is planned, it must not disrupt local activities;
number of stations can be calculated using the
for example, the high mast lighting at the facility must not
processing rates for each type vehicle and its type
disturb the surrounding area.
3-7
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