Holy Cow Tractor Pulling Team

Suction excavator

A suction excavator or vacuum excavator is a construction vehicle that removes earth from a hole on land, or removes heavy debris on land, from various places, by powerful suction through a wide suction pipe which is up to a foot or so diameter. The suction inlet air speed may be up to 100 metres/second (224 mph). The suction nozzle may have two handles for a man to hold it by; those handles may be on a collar which can be rotated to uncover suction-release openings (with grilles over) to release the suction to make the suction nozzle drop anything which it has picked up and is too big to go up the tube. The end of the tube may be toothed. This helps to cut earth when used for excavating; but when it is used to suck up loose debris and litter, some types of debris items may snag on the teeth. The earth to be sucked out may be loosened first with a compressed-air lance, or a powerful water jet. Its construction is somewhat like a gully emptier but with a wider suction hose and a more powerful suction. Excavating with a suction excavator may called "vacuum excavation", or "hydro excavation" if a water jet is used. Vacuum excavation (also known as suction excavation) is considered a best practice for safely locating and witnessing underground utilities, reducing the chance of utility strikes by more than half. RSP Gmbh have been making suction excavators and stationary suction units since 1993, but gully emptiers and the old type of suction street cleaner vehicle that could only pick up loose debris have been around for much longer. Since 1998, the MTS Mobile Tiefbau Saugsysteme GmbH is making a new type of suction excavator. It is said to have a new designed air flow principle, and thus a considerably improved suction performance. Suction excavators are useful to remove earth from around existing buried services or tree roots with much less risk of damaging them than using a conventional excavator with a metal scoop. This type of excavation is held to be a safe and efficient form of excavation. However it is totally unsuitable for archaeological excavation. Using a powerful vacuum and high pressure water, precise holes, trenches and tunnels can be cut to the required size and proportion. Because compressed air or water is used to loosen the earth, the risk of damaging underground utilities is less and contractors can safely find and expose them. Often excavation reveals unknown utilities, saving lives, money and time. It is also referred to as "daylighting", as the underground utilities are exposed to daylight during the process. This type of excavating is quickly becoming recognized as a best practice[4] when working in areas with underground utility congestion and frozen ground. Hydro excavation lessens the risk of damaging utilities, which may often be inaccurately mapped and located and marked on the surface. A suction excavator is useful in bulk excavation in confined areas, where its suction hose can reach in over or through barriers, e.g. digging a swimming pool in a courtyard. It can be used on railways (perhaps mounted on a railroad car base) to suck old track ballast off the track when re-ballasting the track. It can be used as a very heavy-duty vacuum cleaner to pick up miscellaneous debris, e, g, rubble, or big accumulations of fallen leaves or litter. It can suck up liquids, e.g. water from a hollow. The National Grid (UK) (UK electricity suppliers) has ordered 10 suction excavators.[13] As at July 2009 in England the North West Gas Alliance [14] has 3 German-made suction excavators. Force One Ltd specialist image library shows various uses of the new excavation technology including Bridge Refurbishment - Clearing Culverts - Clearance of Holding Tanks - Extension Hose Excavation - Substations - Rail Excavations - Airports - Filter Beds, Lighthouse and many more applications http://www.vactruck.co.uk/gallery.html. There is little known fact about the diversity of the use of vacuum/suction excvators, for example - they are capable of excavating up to 140m horizontally and up to 20m depth depending on the type of material being excavated.

C.O.W. Systems

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