Underground Infrastructure - May 2023 - 41

Rehab Technology
He also advises against " free spooling "
a nozzle up the sewer line.
" Any time you do that, you lose control
of the nozzle - and it can ricochet
back at you. To prevent this, use a nozzle
skid and hold the nozzle back, " he added.
Tip 9 - Choose the right nozzle
for the job to reduce turbulence
and wear.
As is known throughout the industry,
there are several tiers of nozzles, rated
for water efficiency, from Tier 1 (about
30-percent efficient), Tier 2 (50-to-60percent
efficient), to Tier 3 (75-to-98percent
efficient).
What sets the most efficient Tier 3
nozzles apart from others in the category
is fluid mechanics engineering onpar
with the aerodynamics of race cars
or jet fighters.
By more effectively containing, controlling,
and directing high-pressure water
with less turbulence, a Tier 3 nozzle
can deliver more cleaning power at lower
PSI. This eliminates the need for operators
to compensate for the lack of power
from Tier 1 or 2 nozzles by increasing the
pressure to higher PSI on the way back
through the line.
Ultimately, less PSI (with a better,
faster result) makes for safer sewer cleaning,
as outlined in many of the tips above.
Tip 10: Slow and steady wins the
race - and is safer for operators.
The number-one mistake of most sewer
cleaning operators that puts them at risk
is rushing through the process, according
to Story.
" Most operators run their nozzles way
too fast. Rushing to clean more footage
of sewer pipe is dangerous. To clean safely,
keep the nozzle slow and steady, and
let it do its job, " he said.
To stay safe and productive, he advises
contractors to never outrun their water,
or they risk losing control of the process
and eventually running into a blockage.
" Sooner or later operators will run
into a blockage of roots, grease, mineral
deposits or cave-ins that will plug up
their front jets. Then, they no longer have
a penetrating tool but a battering ram - a
nozzle with no forward jets trying to feed
its way through the blockage, " he said.
" For greater operator safety, slow
down even more to remove a blockage
and let the nozzle do the work. The reason
we put forward jets on the nozzles is
to safely open the blockage before the
nozzle arrives. Slow down and the water
will open the blockage before the nozzle
ever gets there. "
While there is much more to the practice
of sewer cleaning, following these 10
tips will go a long way toward keeping
operators safe and productive on the job
for many years to come. UI
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