Steel Grit Trailers are most commonly found in the bridge maintenance industry in the United Steates of America. They are commonly used because of the high percentage of the bridges still contain lead coatings, and recycling steel grit gives you a very low waste stream. The steel grit can be used upto 100 times, and all you are disposing of is the dust, paint chips and remaining abrasive after recycling it numerous times.
The downfalls to blasting with steel grit are;
- Speed of blasting.
Most bridge blasting contractors achieve a maximum blasting speed of 90 sqft/hr, blasting to an SP10.
- Richochet of abrasive.
Bridge blasters have a common complaint that steel grit is highly wearing on their coveralls and on their body as it richoecys off everything it hits.
- Slow recovery process.
You need to have one or two of your crew dedicated to vacuuming up the spent abrasive, otherwise you will run out of grit very quickly.