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Vacuum Truck at a Utility Dig

A specialized vacuum truck works beside a utility trench on a city street near a large pipe and a safety barrier.

A vacuum truck stands beside a utility trench near a large pipe and a safety barrier.
Vacuum Truck at a Utility Dig
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Vacuum Trucks at Urban Utility Sites

A vacuum truck operates along a city street next to an open utility trench. The specialized vehicle stands positioned near a large utility pipe and a high-visibility safety barrier.

How Hydro Excavation Vacuum Trucks Work

Vacuum trucks use high-pressure water jets and powerful suction hoses to clear dirt away from underground utility lines without damaging fragile pipes or electrical cables. This technique, called hydro excavation, stores liquid mud inside a large tank mounted on the truck chassis. Using air suction is much safer than digging with sharp metal excavator buckets near live power lines.

Colors of Municipal Utility Trucks and Streets

  • Vacuum truck tank: Bright white, yellow, or dark green
  • Suction boom arm: Dark gray metal with flexible black hose
  • Utility safety barrier: Bright orange and white reflective stripes
  • Utility pipe: Bright blue for water or yellow for gas
  • Street pavement: Charcoal gray asphalt with painted white lane lines
Questions and answers

Vacuum Truck Questions and Answers

What is soft excavation with a vacuum truck?
Soft excavation uses water pressure to break up soil while a vacuum hose suctions the mud into a debris tank. It uncovers underground infrastructure safely without slicing into gas lines or fiber optic cables.
Why are safety barriers placed around utility trenches on streets?
Safety barriers warn pedestrians and drivers to keep a safe distance from open excavations. They also prevent tools and debris from falling into the trench where utility technicians are working.
Where does the mud go after the vacuum truck collects it?
The truck transports the suctioned mud and slurry to a processing facility or dumping site, where the water is filtered out and the clean dirt can be reused for backfilling trenches.
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