Selecting Sewer Nozzles
for Successful Sewer Pipe Cleaning
Selecting the correct sewer nozzles for a sewer pipe cleaning job can be difficult for the novice. Sewer jetter operators tend to fall in love with a particular nozzle type that they end up using for many different applications.
Every sewer pipe cleaning job has its particular challenges and consequently needs a specific nozzle for each job. For instance cleaning a sewer line of a blockage requires a different nozzle than for normal sewer pipe cleaning.
The NASSCO “Jetter Code of Practice” offers guidance for nozzle selection. They categorize nozzles as Tier 1, Tier 2, and Tier 3:
- The least expensive are Tier 1 and have good fluid mechanics and are configured for one slow and pressure scenario for instance 65 GPM at 2000 PSI - they lose their effectiveness quickly because they have a short life cycle.
- Tier 2 nozzles have better fluid mechanics and replaceable inserts for flexible configurations. They have a longer life cycle and are more expensive.
Tier 3 nozzles have excellent fluid mechanics and replaceable inserts for flexible configurations. They have the longest life cycle but are also the priciest.
Matching Sewer Jetter With Nozzle
Sewer nozzles are fitted to sewer hoses; in other words a 1 inch nozzle fits a 1 inch hose. Also the pump capacity and pressure will determine the type and size.
Angles of Incidence
Sewer cleaning operators must understand the angles of the nozzle's incidence and how it affects its ability to perform the work.
Narrow jet angles self-propel and thrust the nozzle at the expense of pipe wall cleaning ability. A wider jet angle develops wall force cleaning at the expense of forward thrust.
For example a 40° nozzle will be an effective wall cleaner but will have little forward thrust. An 8° degree nozzle jet will produce a lot of forward thrust, but at the expense of wall cleaning ability.
Contact your sewer jetter manufacturer, distributor or specialized sewer nozzles outlet for further information.