TLK UNITED UNIPESSOAL LDA

TLK UNITED UNIPESSOAL LDA

INTRODUCTION TO HYDRO EXCAVATOR

Information sheet

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Contents .......................................................................................................................................................... 1 Description........................................................................................................................................ 3 Diagram ............................................................................................................................................ 4 Possible applications included .......................................................................................................... 5 Extraction rate .................................................................................................................................. 6 Design and operation ........................................................................................................................ 7

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Description Suction excavator produces powerful suction through a wide pipe which is up to 30 centimetres (1 ft) or so diameter. The suction inlet air speed may be up to 100 metres per second (220 mph). Its construction is somewhat like a gully emptier but with a wider suction hose and a more powerful suction. The suction nozzle may have two handles for the operator to hold; 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. 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 finding and seeing underground utilities, reducing by more than half the chance of damaging buried utilities.

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Diagram

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Possible applications included 

Replacement of pipes and fittings



Renovation and new installation of gas-, water-, heating pipes, cables and disposal lines

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Exploratory excavations

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Railway trackside maintenance and repair

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Use of ground displacement rockets

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Clearing away environmental damage

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Replacement of contaminated soil around the roots of trees

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Removal of material in demolition projects

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Removal of gravel from flat roofs

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Cleaning blocked street gutters & gullies

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Operations involving the use of horizontal boring units

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Leaf removal

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Application for special operations

Suction excavators eliminate the need for costly and time-consuming manual labour. Buried pipe systems do not suffer damage. Output is up to sixteen times of that achieved by conventional excavation. In the ESE 32/7: 

The suction pipe's internal diameter is 25 cm (9.8 in)



The fan produces a maximum pressure reduction of about 30,000 Pascals = about 0.3 atmosphere or 4.5 pounds/square inch. Across a circular suction opening 9.8 inches diameter that would give an entry air speed of about 400 mph and a maximum suction power of about 340 pounds = about 3 hundredweight. It can suck up objects up to 25 cm or 9.8 inches across of weight up to 30 kilograms = 66 pounds.

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It is described as able to suck up "earth, stones, vegetable waste, sand, mud, water, pebbles, rubble, asbestos, railway-type ballast".[9]

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Its suction pipe has a detachable extension nozzle narrowing from 10 inches to 4 inches internal diameter, with handles on a rotatable panel to open or close side vents to let the operator let it drop overlarge objects which it has picked up.

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Extraction rate Extraction rates are roughly, in cubic metres per hour:

m3/hour Time for 1 m3.

Material heavy soil with buried cables and pipes

1.6666

36 min

dry heavy soil

2.5

24 min

wet heavy soil or clay

3

20 min

moderately heavy soil with buried cables and pipes 4

15 min

muddy soil, gravel, crushed rock

6

10 min

sandy soil

10

6 min

water

30

2 min

heavy soil with buried cables and pipes excavated by hand

0.25

4 hours

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Design and operation

Model

Length

Fan capacity

Suction negative pressure

Maximum suction depth

Maximum suction span

Spoil tank volume

Power

Axles

Wheelbase

Weight

City 7.5

6.3 m

11.300 m3/h 3813 m3/s

15,000 Pa (0.15 bar)

10 m

30 m

1.1 m3

172 hp

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3.8 m (12 ft; 150 in)

ESE 18

7.1 m

32.000 m3/h 8.88 m3/s

21,000 Pa (0.21 bar)

15 m

70 m

4m

3

280 hp

2

ESE 26

8.8 m

42.000 m3/h 11.66 m3/s

40,000 Pa (0.40 bar)

45 m

120 m

8 m3

310 hp

ESE 32

9.8 m

43.000 m3/h 11.94 m3/s

47,000 Pa (0.47 bar)

50 m

150 m

10 m3

400 hp

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Specifications of carrying truck

Suction pipe internal diameter

Intended use

7.5 tonnes

15 cm (5.9 in)

pedestrian areas, narrow streets

4.2 m (14 ft; 170 in)

18 tonnes

25 cm (9.8 in)

inner-city excavations in confined spaces

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4.2 m (14 ft; 170 in)

28 tonnes

25 cm (9.8 in)

general purpose

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4.2 m (14 ft; 170 in)

32 tonnes

25 cm (9.8 in)

heavy-duty