NitroJet is a system that uses liquid nitrogen to perform cleaning, decontamination, and concrete scabbling at ultra-high pressures and extremely low temperatures.
Principle of NitroJet
Advantages of NitroJet
- A dry process that uses no water and does not generate secondary contamination or liquid waste.
- Permits highly efficient concrete scabbling without abrasives. Also applicable to stripping paint, resin removal, or cutting structures.
- High cleaning capacity without re-adhesion. 100 or greater decontamination factor in the nuclear power field makes it suitable for downgrading of radioactive waste.
- Cleaning speed equivalent to or better than existing methods.
- Less reaction force makes manual operation and remote operation easy. (Side walls/ceilings)
- Only the removed matter has to be vacuumed up. The nitrogen gas is released and does not become secondary waste.
- The process requires no heat input, making it suitable for cleaning/decontaminating substances sensitive to heat input, such as combustible materials.
- The use of nitrogen that is common in the atmosphere eliminates concerns about environmental impacts.
Capacity of NitroJet
|Processing capacity||Concrete scabbling||10 m2/hour (depth of several mm)
2.5 m2/hour (depth 14 mm)
0.14 m2/hour (depth 40 mm)
|Stripping epoxy paint||5 m2/hour|
|Decontamination capacity (DF*)
(nuclear power field)
|Concrete scabbling||DF = 180 to 1,030 (1 pass)
(evaluation using nonradioactive tracer)
DF = 770 (2 passes)
(using actual contaminated concrete pieces from decommissioned Magnox furnace site in UK)
|Stripping epoxy paint||DF = 102 (1 pass)
(using actual contaminated samples of fuel transport container from the decommissioned Magnox furnace site in UK)
|Stripping paint||DF = 1,000 or more (2 passes)
(assessed according to "hot test" results from the Contaminated Water Tank Decontamination Verification Project conducted by the Agency for Natural Resources and Energy.)
* DF (Decontamination Factor): Ratio of degree of contamination before and after decontamination. The higher the DF, the higher the decontamination capacity.
Applications of NitroJet
- Decontamination of radioactive materials
- Concrete scabbling
- Resin removal
- Stripping paint
- Cutting metal
- Stripping coatings from graphite or metal
- Asbestos removal
- Selective concrete demolition
- Cleaning heat exchangers
- Cleaning tools that are contaminated with polymer coating
- Cutting composite materials
- Cutting rubber
- Cutting graphite
Relationship between IHI and NitroCision® USA related to NitroJet
- NitroCision®, LLC (http://www.ihiswt.com/nitrojet/) is an affiliated company of IHI that conducts NitroJet business in the United States.
- As technical information is shared between both companies, Japanese customers should make inquiries through this website.