How It Works
The Technology Behind the Nozzle
Blast Ninja™ is a next-generation abrasive blast nozzle that significantly reduces noise exposure at the source. The proprietary technology leverages years of aero-acoustic research conducted on jet engine noise reduction and was created in partnership with the U.S. Air Force and Office of Naval Research.
Blast Ninja™ reduces nozzle air exit velocity while maintaining particle velocity – therefore reducing noise production at the source while maintaining blasting production. Oceanit performed many years of extensive fluid dynamic modeling, lab analysis, field trials, and rigorous operator testing in various conditions to arrive at the final Blast Ninja™ product.
OSHA has implemented noise exposure limits for the worker’s health and safety. Exposure to high levels of noise can lead to: hearing loss, tinnitus (ringing in the ear), stress, anxiety, high blood pressure, gastrointestinal problems, and chronic fatigue. As a rule of thumb, every 3 dB change represents a halving of sound energy.
The table below provides guidance on how long someone can be safely exposed to different noise levels without wearing hearing protection.
At 115 dB, the average volume of abrasive blasting operations, OSHA regulations allow for just 15 minutes of exposure. Operator downtime creates excess costs associated with an idle asset. Per OSHA requirements, better hearing protection does not reduce worker noise exposure. Only by reducing sound at its source will a worker experience non-hazardous noise.
In certain conditions, Blast Ninja™ can meet OSHA’s noise standard compliance 29 CFR 1910.95 of four hours of exposure, meaning that operators are protected, and productive work time is improved. The standard uses a 5 dBA exchange rate; so for every 5 dBA TWA increase in noise permissible exposure time is cut in half. The reduction in employee exposure to hazardous noise to below the OSHA 8-Hour Time Weighted Average alleviates employer’s need to modify employees’ current practices, reduces the likelihood of injury in the case of PPE failure, and ensures that personnel in adjacent “safe zones” are guaranteed to be safe from exposure.
Blast Ninja™ Increases Nozzle Production
In certain conditions, Blast Ninja™ nozzles have also been shown to increase production rates compared with conventional venturi nozzles, delivering additional value to the blast operator and business.
- Durable carbide insert construction
- Expected nozzle life with expendable abrasives is up to 500 hours, similar to a conventional tungsten carbide nozzle.
- Strip rate equal to, or better than standard venturi nozzles
- Reduction in hazardous noise exposure by up to 17 dB(A)
- Greatly reduced incidence of operator hearing damage
- Reduced OSHA noise citations
Blast Ninja™ nozzles set the new standard in performance, worker safety, and productivity.
Oceanit’s patented and patent pending Blast Ninja™ technology works by reducing the blast nozzle exit velocity while maintaining blast particle velocity. The particle velocity of abrasives in typical abrasive blasting systems is only 30% of the air velocity due to the short acceleration distance available at this velocity. Particle velocity, which is important to productivity, is maintained through the innovative Blast Ninja™ design.