Recommendations for Effective Results.
Once the engine is throttled up to operating speed and the water trigger is pulled,
the diver should find the most effective distance between the gun nozzle and the
surface being cleaned. When the diver is ready to commence cleaning operations,
ensure that the gun trigger is in the open or “ON” position, the gun is submerged
in the water and the water source is on, prior to throttling up the engine.
Ensure that the power unit operator and other people working in the vicinity of the
power unit wear appropriate hearing protection when the engine is running.
Gun efficient operating technique - Figure #18
1. The most efficient operating technique is to hold the nozzle 2-5 inches (5-12 cm)
away from the surface to be cleaned and at a 25° to 45° angle to the surface being
cleaned. The diver needs to observe the shape of the cavitating jet cone. At greater
depths, the higher ambient pressure will cause the jet cone to be shorter. The
widest zone of the cone is the most efficient part of the cavitating jet. Placing the
nozzle closer than 2 inches (5 cm) from the surface being cleaned will not allow for
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