St Francis Bay Beach Trust - The Estuary Waterways

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As part of the Estuary Survey we will be modelling the whole St Francis waterways system including the canals. This will provide initial data which will be available for enhancement at a later stage if and when a full bathymetric survey of the canals is required.

St Francis Bay Beach Trust

Dimensions

Length

45 ft. (13,8 m)

Width

10 ft. 7 in. (3,2 m)

Height

9 ft. 4in. (2,8 m)

Weight

31,000 lbs. (14,100 kg)

Flotation

Pontoons

Two (2) pontoons, 39 in. x 38 in. x 360 in. (991 mm x 965 mm x 9,144 mm); 10 ga. steel sides, bottom and 1/4" diamond plate tops; internal bulkheads and stiffeners and coated with coal tar based TNEMEC paint

Displacement

31,500 lbs. (14,300 kg)

Draft

30 in. (762 mm)

Working Capacity

Cut

108 in. (2,743 mm) wide X 22 in. (559 mm) Deep

Working Depth

22 ft. (6,7 m)

Engine

Type

John Deere Diesel Model 6081HF070, 6-cylinder, 8.1 L, 325 HP (242 kW) @ 2,200 rpm

Fuel Capacity

300 gal. (1,135 liters)

Fuel Consumption

15.9 gal./hr. (60.3 lit./hr.)

Hydraulic Systems

Circuit #1

Slurry Pump
5.4 in.³/rev.
72 gpm (4.45 liter/sec.) @ 5,500 psig

Circuit #2

Cutterhead, Boom, Winches and Starwheels®
6.0 in.³/rev. load sense
59 gpm (3.72 liter/sec.) @ 2,500 psig

Reservoir

120 gal. (454 liters)

Filtration

2 tank mounted return filters with a 10-micron rating and indicator suction filter for the slurry pump circuit 3-micron rating and indicator filter with water removal capability are optional

Cutterhead

Cutterbar

Diameter - 22 in. (559 mm)
Length - 108 in. (2,743 mm)
Replaceable hardened steel excavator blades; available with paddlebar for materials that are easily slurried.

Drive

Recessed dual hydraulic motor; direct drive with no gear reduction

Speed

Variable to 90 rpm @ 2,500 psi

Torque

12,960 in.-lbs. (1,475 N-m) @ 2,500 psi

Dredge Pump

Type

GIW Cast Iron Pump

Discharge Diameter

8 in. (203 mm)

Suction Diameter

10 in. (254 mm)

Impeller Diameter

24 in. (610 mm)

Sphere Passage

4 in. (101 mm)

Pump Performance

3,500 gpm (221 liter/sec) @ 143 ft. (43,6 m) TDH (slurry s.g. 1.25)) @ 881 rpm w/2000 ft (609 m) discharge length

Controls

Electronic joystick controls are provided in a heated, air- conditioned cab

Propulsion

STARWHEEL® Drive Self-Propulsion system; cable drive optional. STARWHEELS® are individually operated for high maneuverability

Electrical System

Voltage

12 volt, negative ground

Alternator Output

130 Amp

Corrosion Protection

Standard Paint

Superstructure and hull are sandblasted and painted with coal tar based TNEMEC paint (hull) and Devoe Devthane (urethane) or Devtar (superstructure & accessories); average coverage is 14 mils. Cab is painted with PPG urethane paint. Paint system suitable for saltwater service

Optional Paint

For caustic low pH environments, Duromar paint may be applied; suitable for pH range of 14 to 1.5

Cathodic protection available.

Available Accessories

Talk with a representative about options and custom features available.

St Francis Bay Beach Trust

www.sfbbeachtrust.org - St Francis Bay Beach Trust ~ Saving Our Beach

Dredgepack Information Brochure. Click here to download this document....

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Photos of the St Francis Beach Trust Model 5012 HP Versi-Dredge
(Click picture to view larger image)

IMS is the only truly self-propelled dredge in the world with the exception of ships that are designed and function as dredges. The Starwheel Drive self-propulsion system is protected by a U.S. patent which is valid for another 9 years. Several years ago, shortly after China joined the WTO, a Shanghai manufacturer built a copy of our dredge with Starwheel drive. This came to the attention of our Chinese representative who informed them of our patent. After several meetings the Shanghai Company decided to honor our patent.

Below is a list of several 5012 HP end users. We have built over 150 IMS Model 5012 systems and shipped them around the globe. Below is a sampling of recent 5012 HP sales.

City of Dagupan Philippines
- Using 5012 HP to clean and deepen river to prevent flooding.
O’Bryan Consulting (St. Louis, MO)
- Using 5012 HP on various projects (lakes, marinas, mine settling ponds, rivers, etc.) – O’Bryan is a general contractor
Central Sand (Orlando, FL)
- Using 5012 HP for sand mining operation. Sand is then hauled to the coast and used on lucrative beach restoration projects in Florida.
Beaver Lake Association (Nebraska)
- Using 5012 HP year round to clean sediment from a high end neighborhood. The 5012 HP replaced the association’s Mud Cat dredge (cable driven).
Royal Reef Resort (Turks and Caicos)
- Using 5012 HP in open water at 5 star resort to clear boat channel and for beach restoration.
City of San Carlos, Philippines
- Using 5012 HP to clean and deepen river to prevent flooding. (huge problem in Philippines)
USA Heavy Equipment (Venezuela)
- Using 5012 HP to clean out shipping channels.
Bob Macomber Construction (California)
- Using 5012 HP to clean out high end marinas in Southern California.
Apple Canyon Lake (Illinois)
- Using 5012 HP to clean out lake front property and lake basin. The 5012 HP replaced the association’s Mud Cat dredge (cable driven).
ABB Industrial (Texas/Louisiana)
- Using 5012 HP to clean out ship channels off inner-coastal waterway in Louisiana. Also performing hurricane relief work.

Below are the decibel readings for the Model 5012 HP Versi-Dredge:

Distance	Outside the Operator’s Cabin
7 m	86 dB
15 m	80 dB
30 m	74 dB
61 m	68 dB
91 m	60 dB
200 m	30 dB
500 m	0 dB

RPM	Inside the Operator’s Cabin
800 rpm	65 dB
1,500 rpm	70 dB
2,000 rpm	79 dB
2,340 rpm	78 dB

Sound Level (dB)	Comfort Level	Relative Loudness
120 dB	Uncomfortably Loud	Military jet aircraft take-off
100 dB	Very Loud	Jet flyover at 300 metres
90 dB	Loud	Motorcycle doing 80km/ph
70 dB	Moderately Loud	Rush Hour traffic
60 dB	Acceptable	Normal Conversation
60 dB	91 m - Dredge will normally be further than 100 m from Shore Road (see table above)
50 dB	Quiet	Large Transformers at 33m
40 dB	Very Quiet	Small Bird's Call
30 dB	200 m Normal operating area lies beyond 200 m from Shore Road (see table above)
10 dB	Just audible	Whisper

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Estimated Dredging Costs per Hour for IMS 5012 HP Model

Fuel @ R 7.00 per litre	R 420.00
Insurance (R 84k p.a.)	R 30.00
Labour Costs ( 2 x R 50.00 / hr)	R 100.00
Maintenance	R 7.50
Mechanical O/head Costs (accrued)	R 30.00
Pump & Cutterhead Wear	R 37.50
Hull Maintenance	R 27.00
Hourly Operating Cost	R 652.00
Daily Cost x 8 hours	R 5 216.00
Weekly Cost x 5 days	R 26 080.00
Annual Cost x 48 weeks	R 1 251 840.00
192 000 cubic meters p.a.	R 6.52/m³

Note* Plus financing costs ( including capital ) of a further R 1.248 k giving a total of R13.50/m³

The above cost per m3 should be compared with the R 25 – 30/m³ used by Operator A in the Western Cape and the R95/m³ currently quoted by Operator B in the Eastern Cape.

Using the SFB Beach Trust figure of R13.50 /m³ we would be able to pay off the capital costs of the dredge in two years from the savings in cost compared to using the lowest cost from Operator A of R 30/m³. This is based on moving 192,000 m³ per annum. At a lower figure of 100 000 m³ our costs are under R 25 m³ which is lower than Operator A and still gives us the capital asset over 5 years.

Alan Tonkin

15 August, 2006

St Francis Bay / Kromme River Dredge Project. Click here to download this document....

270kb

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St Francis Bay Beach Trust