The rescue, using an air lance
to free the area around the girl, took around 20 minutes once the crews were on the scene on Sunday night.
Its compressor is rated at 300 cfm at 220 psi with an air lance
, and 300 cfm at 100 psi for air tools such as a jackhammer or a pneumatic tamper.
Compressed air for excavation is delivered through a proprietary air lance
to penetrate, expand and displace all types of soil.
Vacuum excavating equipment actually "digs" with a stream of high-pressure air directed by a nozzle - called an air lance
- to penetrate, expand, and break up soil.
The controlled atmosphere calciner is a natural gas, direct-fired, rotary unit whose effectiveness is enhanced by a unique method for introducing secondary combustion air via an air lance
. Lance air is preheated with recovered heat from the rotary cooler and blown into the calciner's solids bed to oxidize the organic binders.
The basic system includes Utiliscope's unique air lance
, making the VE-75 the world's most portable dry type vacuum excavator.
Once the asphalt was removed, an air lance
was used to loosen the soil while at the same time, a vacuum hose removed the spoils from the excavation.
The Utilivac's standard hopper is a 75-gallon tank; optional larger tanks are available, in addition, the patented Air Lance
allows non-destructive excavation without high pressure water.
The truck-mounted air excavation unit has a vacuum rated at 1,000 cfm at 15 inches of mercury; for soft excavation, the unit delivers 300 cfm at 220 psi through the air lance
used for potholing.
Technicians clear surfaces and cracks of unwanted debris, unruly grass and excess moisture with blasts from hot air lances
delivering 2,800-degree heat before spraying on a professional-quality flat black sealcoat, more durable than that available in local home improvement stores.
In addition, air lances
and blowoff devices are manually operated and exhaust high volumes of uncontrolled air.