a. A minimum of two trucks with crews of five men each, alternately
laying hose and reloading the trucks, is recommended for efficient hose
laying.
b. The individual task assignments for each crew member are as follows:
one supervisor, one truck driver, one assistant driver, and two line
walkers.
The assistant driver is needed to observe the actual flaking of
the hose out of the flaking boxes and the work of the line walkers.
The
assistant driver tells the driver to vary the speed of the truck according
to the speed and needs of the line walkers and also stops the operation if
there is a problem with the hose.
A minimum of two line walkers follow
behind each truck, straightening kinks or bends in the hose line. The line
walkers are also responsible for picking up the hose line and moving it away
from the roadway.
4.
To lay the hose line proceed as follows:
a. Connect the leading end of the upper length of the hose line to the
butterfly valve on the discharge hose assembly at the lead pumping station
using the victualic coupling attached to the leading end of the hose line
length. Restrain the hose manually until the first 50 feet of hose are in
place. After 50 feet of hose are in position, the weight of the hose will
hold the line in place. The assistant driver must observe the hose-laying
operation at the rear of the truck. He tells the driver to speed up, slow
down, or stop the truck depending on the needs of the line walkers
straightening and repositioning the hose line.
He must also observe the
hose as it flakes out of the flaking box for catching or binding. As the
hose line is laid out, two line walkers walk the line behind the truck to
straighten out kinks or bends in the hose line. If the hose line is being
laid along an existing roadway, the hose must be manually repositioned by
the line walkers. Retain empty flaking boxes, tailgates, and breakaways for
repacking and redeployment. Connect subsequent truck loads of hose line to
hose line already laid. Connect hose line to each boost pumping station,
storage assembly, and, if required, the pressure-reducing valve as those
installation sites are reached.
b. If the hose line must be laid across a roadway or railroad, lay the
hose under an existing bridge or through an existing culvert. The leading
end of the hose may be pulled through the culvert using a rope.
If no
bridge or culvert is usable, expedient roadway crossings may be constructed
using the roadway-crossing guards provided.
The hose line must never be
buried unprotected because the weight of the fill can collapse the hose, and
any sharp rocks in contact with the hose can cause a puncture. A plank is
nailed to the bottom of the guard for greater hose protection.
If it is
necessary to lay the hose under a railroad bed, dig a tunnel beneath the
gravel
QM4912
3-8
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