tshd

N O. 8 | 2 0 1 5
Maritime
Holland
Special
Fast Forward&
Rewind
2015/2016
René ten Brinke
Experienced
strategist
Maritime
prizes galore!
Acta Orion
Ilembe
Aquijo
Ilembe
© Reprinted from Maritime Holland | No. 8 December 2015
www.maritimeholland.com | Publisher: Navingo BV | www.navingo.com
Royal IHC delivers
latest TSHD
for South African
harbour
maintenance
was signed in March 2014. With the keel laid
selected on the basis of local availability in
on 8 January 2015, the vessel will be deliv-
Africa, and easy reparability; indeed, some of
ered in Durban, its homeport, in early 2016,
the equipment used on board Ilembe during
which is a very short turnaround.
newbuilding is already manufactured in
South Africa. However, all the main dredging
As IHC’s executive director shipbuilding,
components and systems are designed and
Fer Tummers, stated in his address during
produced within IHC, with parts manufac-
the launch ceremony: “IHC value the long
tured in association with regional Dutch
history of collaboration with TNPA. The
entrepreneurs.
South African port authority expressed great
Photo by Flying Focus
IHC’s products.” Being one of the five oper-
set up a Supplier Development (SD) plan in
ating divisions of Transnet SOC Ltd., TNPA
order to further develop and improve the
are responsible for the safe, effective and
local industry in South Africa. The primary
efficient economic functioning of the South
activity within the SD plan is to establish a
African national port system. As such, they
school for dredging operators - including the
excellency’ - ‘eleqa amanye amaLEMBE
require highly reliable dredgers, resulting in
delivery of a dredging simulator - where IHC,
ngokukhalipha’. North of Durban is a mu-
low-maintenance requirements, excellent
together with TNPA’s own Maritime School of
nicipality also called iLembe, which is one
dredging performance, high workability and
Excellence, will initiate a long-standing coop-
of the eleven district municipalities of the
a high level of safety.
eration for the training of local people.
municipality of iLembe, formerly named King
It is for these reasons that TNPA do not wish
Sense and sensibility
Shaka District Municipality, has a rich histor-
to experiment with the latest unique or
The superstructure with the accommodation
ical connection to the Zulu tribe, confirmed
customised techniques, nor be a test case for
is set at the far forward end of the TSHD,
by its district town KwaDukuza accommodat-
prototyping equipment, but rather opt for
while the main machinery room with the
ing the tomb of King Shaka.
reliability and proven tooling. Furthermore,
pump room is aft, and the hopper in the
all equipment and materials on board are
middle between the two. Under the accom-
KwaZulu-Natal province in South Africa. The
Survival of the fittest
modation are technical spaces, the bow
IHC were awarded the project after sub-
thruster room and the forepeak. The dredge
pipe is to port side and feeds the directly
On Saturday 9 May 2015, Ilembe was launched
The vessel’s name, Ilembe, is a South African
mitting a successful, and attractive, design
and named at the IHC facility in the township
title for a hero. Having played a vital role in
proposal during an open tender procedure
of Kinderdijk, at the confluence of the Lek and
uniting the Zulu tribes and fighting against the
for what was to become the largest dredging
Noord rivers. Lunga Ngcobo, general manager
Europeans, King Shaka Zulu was hailed as
vessel of its kind operating in South Africa.
corporate affairs at TNPA, performed the
‘Ilembe’. He was, and still is, described as
The contract for the design, construction and
naming ceremony.
‘a hero who excels due to his wisdom and
delivery of the vessel between TNPA and IHC
048
As part of the contract with TNPA, IHC will
EXTENSIVE
LIFECYCLE
SUPPORT
049
driven main dredge pump in the aft ship. The
dredge suction pipe itself is 900 millimetres
in diameter. The dredging system control is
provided by IHC Systems, a division of the
parent company.
MARITIME HOLL AND | NO. 8 | 2015
MARITIME HOLL AND | NO. 8 | 2015
Trailing Suction Hopper Dredger (TSDH), Ilembe, with its 5,500 cubic
metres hopper, is Royal IHC’s latest addition to the Transnet National
Ports Authority (TNPA) fleet. This TSHD will help TNPA maintain the
standards of South Africa’s eight main commercial seaports and expand
the capacity of the bay of Durban Port. This latest offering will join
TNPA’s existing fleet of IHC-built vessels, which includes the 4,200
cubic metres TSHD Isandlwana, delivered in 2010, and the grab hopper
dredger, Italeni, of 2014. TSHD Ilembe will replace TSHD Ingwenya,
which was also built by IHC and delivered to TNPA in the early 1980.
confidence in the quality and reliability of
ILEMBE
are 13 at centreline in the hopper bottom.
Alternatively, it can be pumped ashore
through a (floating) pipeline or, finally, by
what is known as ‘rainbowing’. This means
discharging from the bow by means of a
high-pressure spray, to create an area of
reclaimed land. However, TSHD Ilembe will
primarily use the bow coupling for discharging, via a shore connection, to a cleaning and
filtration plant along the quayside in Durban.
The resulting purified sand will be used for
beach replenishment. When the vessel is
being discharged, water injection pumps
are employed, which liquefy the spoil via
injection nozzles on both sides at the hopper
bottom. The coupling for a (floating) pipe and
Ilembe can discharge the dredged spoil through 13 conical valves at centreline in the hopper bottom
The overflow system ensures maximum retention of solids in the hopper in parallel with fast
discharge of water overboard
the rainbow nozzle are situated at the bow.
The jet pumps and the single-walled dredge pump are located in a watertight compartment forward of the engine room
The hopper includes an overflow system,
Plain sailing
designed to optimise the efficiency of the
The main propulsion package consists of two
the nozzled CPPs. To further enhance the ma-
dredging process by ensuring the maximum
marine diesel engines, each with a gearbox at
noeuvrability, the vessel has a tunnel thruster
retention of solids in the hopper in parallel
both ends. The aft gearboxes drive controlla-
in the bow, having its engine flexibly mounted
with fast discharge of water overboard. The
ble pitch propellers (CPPs) in a nozzle, regu-
to reduce transmission of noise.
vessel is also fitted with a degassing plant
lated by a propulsion control and monitoring
as the dredger can operate in areas where
The wheelhouse forward area contains the
and laundry are located on main deck, while
facilities nearby, the redundancy offered
natural gases are trapped or dissolved in the
main navigation consoles on centreline, with
food storage space, along with cool and
by a dual dredge pipe installation was not
dredged material. As the soil comes to the
all the usual navigation and ship control
freeze storage rooms, can be found straight
deemed crucial. Consequently, the grab
surface and is exposed to a reduced pressure,
facilities; this is the ‘captain’s area’ and des-
below the galley in a separated area of the
hopper dredger, Italeni, will tackle inacces-
the gases within it expand and are released
ignated for sailing in the conventional sense.
technical space.
sible harbour corners. As the South African
to atmosphere. In doing so, they reduce
harbours are often polluted with debris, the
the density of the mixture. This all happens
dredge head is fitted with an inlet grating.
prior to passing through the dredge pump.
The radio console is to starboard fore, while
sizable spade rudders have been fitted behind
The starboard side main engine also drives
LOW-MAINTENANCE
HIGH-WORKABILITY
HIGH-SAFETY LEVELS
the jet pumps via a coupling to the forward
end. The portside main engine runs parallel
with an auxiliary diesel engine; both can
power the dredge pump at the same time
through a dual-input, single-output gearbox.
The jet pumps and the single-walled dredge
portside fore accommodates the chart table.
The area below the superstructure, on the
The portside aft part of the bridge is the
same level as tank top and tween deck,
operational area for dredging activities, and
contains the technical spaces, comprising
A swell-compensating system has been
efficiency or completely stop the dredging
system. These gearboxes are horizontal-offset
is home to the ‘dredge master’. Starboard
the domestic machinery and equipment,
installed to maintain the dredge mouth posi-
process all together. Moreover, these gases
single-input, dual-output units, with a shaft
The emergency or harbour generator set is
side aft contains an L-shaped settee, whilst
providing facilities for the accommodation,
tion and pressure on the seabed at all times,
are typically organic by nature and can be
generator coupled to the rear of the star-
accommodated to portside aft on main deck
the two bridge parts are separated in the
including a ballast water treatment unit.
when the vessel is dredging on the move. To
toxic or potentially explosive.
board box. As manoeuvrability is essential,
level, in a dedicated compartment behind
middle by a kitchenette and the stairs to
Clearly this would radically reduce dredging
pump are located in a watertight compartment forward of the engine room.
facilitate the stationery dredging capability,
the casing containing the ventilation com-
Sand and silt dredging
or when dredging silt and mud, a dedicated
Ilembe is designed to dredge to a maximum
suction mouth with high-pressure jets can be
Below the wheelhouse, on the restricted
depth of 30 metres by means of a suction
fitted, which loosen the seabed by injecting
are the various storage spaces for engine
height A-deck, is a converter room housing
tube of 900 millimetre diameter with a
water into it. During normal trailing dredging,
parts and spare dredging equipment. On
most of the electrical junction boxes, control
dredge head on portside. The owners opted
the drag head teeth, which are no longer
main deck, aft of the casing to starboard side,
units and the HVAC system to support
for a singular rather than duplex suction tube
useful when the vessel is stationary, cut into
a workshop annex welding space is located.
the bridge and accommodation. The crew
to simplify the installation. With local repair
the riverbed in the normal fashion. When
lower decks.
Ilembe is designed to dredge to a maximum depth of 30 metres by means of a suction tube with a dredge head on portside
ponents and the exhaust lines to the engine
room. Aft of the engine room on tween deck
stationary dredging, the system can maintain
All mod cons outdoors
lower superstructure decks, between the
a required distance from the seabed to allow
On the aft deck, two capstans and four
the pressure jets, referred to above, to work
bollards (two on each side) are situated
at their highest efficiency.
for mooring purposes. A rope basket and a
wheelhouse and the technical spaces in the
hull. The vessel has a crew of 26 people, each
with their own individual single-berth cabin.
Furthermore, these three decks comprise
offices on B-deck and a crew mess, an
officer’s mess, a hospital and changing room
at forecastle deck level. A gymnasium, galley
SUPPLIER
DEVELOPMENT
PLAN,
SUPPORTING
LOCAL INDUSTRY
051
horizontal wire drum to starboard side, the
The vessel is capable of discharging the
stern anchor equipment on centreline, and
dredged spoil by three different means. It
the guide rollers or fairleads in the guardrails
can be dumped out of the bottom of the
complete the aft anchoring and mooring
vessel through conical valves, of which there
equipment. On the foredeck, a further four
bollards (two on each side) are situated,
053
MARITIME HOLL AND | NO. 8 | 2015
MARITIME HOLL AND | NO. 8 | 2015
accommodation is to be found on the
Photo by J. Klaasman, Sleep- & Duwvaart
complemented with a rope basket, a number
ing and transporting equipment into the
Tipping the scales
of fairleads and guide rollers in the bulwark,
forward technical spaces. On port side, two
Although the quality of the vessels and equip-
plus two combined bow anchor/mooring
dedicated gantry cranes with heave compen-
ment, alongside IHC’s reputation and their
winches with horizontal rope drums.
sation are installed for the handling of the
long-term relationship with this client, were
suction pipe assembly.
an important selection criterion, being able to
For general tasks, two stiff boom cranes are
provide more than just a hopper dredger gave
fitted: one to starboard side of centreline
On the raised aft coaming deck to starboard
IHC the competitive edge. The willingness to
on the aft coaming deck, and one on the
side next to the funnel, a twelve metre steel
invest in the further development of the South
starboard side gangway just behind the
workboat is placed. This workboat is manu-
African industry, as well as enabling training
superstructure. The aft crane is primarily for
factured in South Africa as part of the Sup-
and extensive lifecycle support after delivery,
lifting dredging equipment and maintenance
plier Development (SD) plan to improve the
tipped the scale for granting the order.
purposes, such as changing the dredging
local industry. The required lifeboats, one on
mouth. The second smaller crane is fitted
each side, are installed in the matching davit
above a service hatch, facilitating provision-
installations just aft of the superstructure.
Tom Oomkens
Alternatively, dredged spoil can be pumped ashore through a pipeline or by what is known as ‘rainbowing’
Photo by Flying Focus
Owner
Transnet National Ports Authority, Durban,
South Africa
Length o.a.
Length p.p.
Breadth mld.
Depth mld.
Draught
Speed
Complement
Dredging parameters
Hopper capacity
Suction pipe, diameter
Dredging depth, max.
Installed power, total
Tank capacities
Marine diesel oil
Freshwater, drinking
Freshwater, technical
101.50 m
96.85 m
22.40 m
7.50 m
6.00 m
11.9 kn
26 persons
MARITIME HOLL AND | NO. 8 | 2015
Principal particulars
Builder
Royal IHC, Kinderdijk, the Netherlands
5,500 m3
900 mm
30 m
7,660 kW
393 m3
42 m3
42 m3
055