Underground Infrastructure - May 2023 - 39

REHABTECHNOLOGY
10 Expert Tips to Ensure
Safe Sewer Cleaning
Del Williams | Technical Writer
Municipalities must safely clean and
maintain many miles of sewer line annually
to eliminate blockages and prevent
sanitary sewer overflows, which are
regulated by the EPA. However, the use
of high-pressure equipment in underground
sewers can be dangerous, unless
operators are well-trained and fully understand
the hazards.
Understanding and correcting some
of the typical operator mistakes in sewer
cleaning can go a long way toward keeping
everyone safe.
Dan Story, safety expert and operations
manager at KEG Technologies,
who has instructed operators for decades,
provides 10 tried-and-true sewer
cleaning safety tips that address the
most-common errors he has observed.
As a national trainer of best-practice
techniques, the company is a member of
NASSCO.
Tip 1: Properly set up the area
around the sewer vacuum truck
to ensure operator safety in
street traffic.
" To start sewer cleaning, when you park
the vacuum truck in the middle of the
road, you need to block off the traffic so
it can pass in a safe manner. Set safety
cones in front and behind the work zone
and make sure the hazard flasher lights
are functioning correctly, " said Story.
Tip 2: Keep equipment noise levels
low enough to hear traffic.
Tier 3 nozzles can deliver safer sewer cleaning at lower PSI.
UndergroundInfrastructure.com | MAY 2023 39
Revving the sewer truck engine and
running its vacuum pump can be noisy.
Story advises keeping RPMs low enough
so operators can hear, and avoid, approaching
vehicles, and converse with
co-workers, as needed.
One way to do this during engine
operation is by only using the vacuum
when needed and allowing the water to
pass through as the solids remain.
" You can put the nozzle in the bottom
of the sewer pipe and let the water
run around it, " he explained. " The solids
remain to vacuum as needed; you do not
need to run continuously high RPMs. "
Another method is using more effi
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Underground Infrastructure - May 2023

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Underground Infrastructure - May 2023 - 18A
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