Backhoe dredger (BHDs) are stationary dredgers with a hydraulic excavator installed on a pontoon. The backhoe dredgers can dredge a wide range of materials very precisely and they operate mainly in shallow and
enclosed waters. The backhoe dredger is anchored firmly with three spuds.
This one is ready for immediate work and has just undergone refit (early 2023)
35 ton Breakout force with 8m dipper
50 ton Breakout force with 5m dipper
SWL 8t @ 22m Max 200m3 /hr with 4m3 bucket and no adjustment of intermediate boom
Registry - AMSA
Class USL 2B and 2D
Length - 34.95 mtr
Breadth (Moulded) - 15 mtr
Depth (Moulded) - 3 mtr
Design Draft (lightship) - 1.7 mtr
GRT - 467 t
Built 1981, Major conversion to Backhoe barge May 2012
Max Draught Dredging Load Line - 2.1 mtr
Main Engines - 2 x Cummins QSK-19 448 KW
Generator - 2 x18KVA (3 Phase)
Bow thrusters - 4 x Keypower thrusters 12kw each
Consumption at idle - 20L per hour
Consumption dredging - 130 L per Hour
Fuel - 21.5 m3
Fresh Water - 1.32 m³ & 1.0 m³ desal
Hydraulic Oil - 0.6 m³
Lube oil - 0.6 m³
Waste Oil - 2 x 1.32 m³
Sullage - 3.0 m³
Fuel Transfer Pump - 1 x pneumatic Graco Diaphragm
Excavator - Hitachi Super EX 1800-3
Boom Length - 8 mtr Boom & int Boom
Stick Length - 5 m / 9 m
Max Dredge Depth - 17 mtr
Bucket Capacity - 1.5m³ - 3 m³ - 4 m³ - 6 m³
Hydraulic Grab capacity - 3 m³
Aft Spuds - 2 @24 mtr Long / 1.2m Dia
Fwd Spud - 1 @ 24 mtr Long / 1.2 m Dia
Spud Control - Hydraulically controlled via remote
Jack Up Capacity - 100t
Position, Height Control - GPS RTK Positioning.
Anchor Windlass - 6t Winch Emergency anchor
Deck Crane - Fassi F360XP.28 885kg @20.9 mtr
Two Bridle recovery winch - 6t Hydraulic
HPU - Perkins
Office - 20 ft Fitted out container
Crib - 20 ft Fitted out container
Ablution - Macerator Pump
Workshop - 10 ft Container
Refit 2023 was undertaken in 2 stages: Pre docking at Onslow Shore base and Docking at Birdon Slipway in Dampier in February and March 2023.
Planning and execution were driven by Planned Maintenance Systems, latest NSCV and Marine Orders Standards and Invasive Marine Pest (IMP) management. Inclusive of Domestic Commercial Vessel 2B, 2D and Load Line Renewal Surveys completed March 4.
- Pre docking maintenance commenced January 28, completed February 17 at Onslow Shore base.
- Docking commenced February 20 at Birdon Slipway Dampier, completed, and launched March 12.
- Remaining asset preservation at Onslow Shore base commenced March 20, completed March 25.
- 5th Year DCV Survey Renewals.
- 10th year hull and construction Non-Destructive Thickness Testing (inclusive of spud casings).
Hull and structure protective coating renewals – 5-year systems below and above waterline including cathodic protection and Invasive Marine Pest protection management.
- Addendum to Stability Book, inclusive of replacement of 4,500L diesel tank to 10,000L diesel tank.
- Ballast tanks drained, cleaned, surveyed, preserved, and refilled again with potable water (to IMP standards).
- Voids cleaned, surveyed, and preserved. Minor pad welding in 3 spots in voids 2P, 3S and 5S.
- Void hatch covers, and hardware and gaskets replaced where required, sounding/pumping caps emplaced.
- Thrusters removed, serviced, installed.
- Aft spud casing bearings replaced to specification.
- Various handrails, safety gates, equipment stands, delineation and demarcation replaced/upgraded.
- Excavator main control valve removed, overhauled, installed.
- Excavator hydraulic/powerplant performance tune to specifications (Hitachi).
Backhoe Dredger CERTIFICATES AND SURVEYS RENEWED
Certificate of Survey – New expiry date 13/02/28
Load line Survey – New expiry date 13/02/28
Fire – Fixed - Generator Room – New expiry date 08/02/24
Electrical – RCD – New expiry date 22/2/24
Electrical – Megger – New expiry date 22/2/28
Antifouling Certificate PPG Eco fleet 290 – Issued 10/3/23.
Paint Specification PPG 5 Year System – Valid to March 2028