When using a high velocity cleaning machine, in which direction should the nozzle be pointed?

When using a high velocity cleaning machine, in which direction should the nozzle be pointed?

• A. Upstream
• B. Downstream
• C. Doesn't matter
• D. Depends on line size

Answer: (A)

Pointing the nozzle upstream maximizes cleaning effectiveness. When the high-pressure jets hit the pipe walls against the direction of flow, they scour and break loose deposits more efficiently. The wastewater flow then carries the loosened material downstream, away from the nozzle, reducing splashback and backflow toward the operator. Pointing downstream tends to push debris and loosened material toward the upstream section and is generally less effective at cleaning the interior surface, regardless of pipe size.

Pointing the nozzle upstream maximizes cleaning effectiveness. When the high-pressure jets hit the pipe walls against the direction of flow, they scour and break loose deposits more efficiently. The wastewater flow then carries the loosened material downstream, away from the nozzle, reducing splashback and backflow toward the operator. Pointing downstream tends to push debris and loosened material toward the upstream section and is generally less effective at cleaning the interior surface, regardless of pipe size.