Apr 302015
 

Fugro

APT Global has delivered newly built modular Jack-Up Barge “Fugro Oceanus” to Fugro Middle East.

“Fugro Oceanus” is a modular self-elevating drilling platform built under RINA classification and is designed to carry out marine soil investigation works related to dredging in coastal waters, ports and tidal waters in depths of up to 25m.

Measuring 12.2 x 9.8m the platform comprises of four modular pontoons locked together by a proprietary locking arrangement. Each pontoon comprises of three individual watertight compartments and is designed to stay afloat with any three compartments totally flooded.

Mark Heims from Fugro Middle East said: “The Fugro Oceanus was commissioned to be built as a compliment to the six Self Elevating Platforms that Fugro Middle East operate in the region for Geotechnical exploration.

“We have chosen to work with APT on the building of this SEP because of their flexibility in resolving the specific issues that relate to such platforms, as well as commercial considerations.

“With the service we have experienced up to this point we would consider APT Global as a preferred supplier for similar “New Builds” in the future.”

The platform is jacked up using a hydraulic jacking unit and a block locking device on each of the 4 legs.

Deck equipment generally includes a hydraulic power pack, backup hydraulic power pack, a drilling rig, pipe rack, water pump and a generator.

 Posted by at 09:13
Apr 142015
 

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The 24 x 16.5 m pontoon is featuring a moon pool and 200 t hydraulic winch installation with containerized power pack for handling large gravity anchors.

The construction of AHP 1731 was commissioned to support Van Oord’s cutter suction dredger Artemis, a 130 m long vessel with a total installed power of 24,650 kW. Along with its sister vessel the Athena, it is among the most modern and powerful self-propelled cutter suction dredgers in the world.

This piece of equipment was built under Bureau Veritas classification.

APT Global is an equipment manufacturer and technical service provider in Marine, Dredging, Offshore, Oil & Gas, Industry and Energy with production and yard facilities in Dubai, Qatar and India.

 Posted by at 07:52
Apr 142015
 

Booster Station

APT Global plays major role in construction and installation of 5MW land based booster station “Al Jabbar” for a satisfied Van Oord.

After fabrication and machining of the 50+ Ton foundation skid structure in one of our UAE facilities the structures and components were shipped to the project site in Kuwait.

APT Global mobilized a dedicated team of specialists and equipment to undertake the complete turn- key mechanical installation of Electric motor, Gearbox and 1000mm pipe line diameter Dredge Pump, supporting Van Oord’s project team.

Another great example of our capabilities and our flexible, service oriented approach to global support.

 Posted by at 07:50
Dec 202014
 

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APT Global Marine Services recently successfully dry-docked both cutter suction dredger HAM 218 as well as water injection dredger Iguazú for the Van Oord Ship Management B.V. at DMC Dubai.

With these 2 dry-dockings completed (HAM 218 being the first large cutter suction dredger to ever dry dock within DMC), APT Global reaffirms its position as a rapidly growing player in the maritime repair market.

Since our inception in 2003 we have developed into a recognized partner for an ever growing client base. We understand the ever changing requirements of our customers, resulting in long standing relationships and a fast growing global exposure,” APT announced.

Upon completion of the repairs, HAM 218 has set sail to join the fleet currently being mobilized for the Suez Canal expansion project.

Iguazu

Following the successful repairs of the above mentioned vessels, APT Global is currently undertaking dry-docking and conversion projects of several other vessels being mobilized to Suez.

Dubai based APT Global is a leading technical service provider in Marine, Dredging, Offshore, Oil & Gas, Industry and Construction with operations in the UAE, Qatar and India.

Our operations in Dubai Maritime City, supported by our in house multidisciplinary facilities, enable us to undertake full scope dry docking repairs on vessels up to 130x35m/6000MT,” APT stated.

 Posted by at 10:30
Jan 222012
 

400px-oil_platform_p-51_brazil.jpgAn oil platform, also referred to as an offshore platform or, somewhat incorrectly, oil rig, is a lаrge structure with facilities to drill wells, to extract and process oil and natural gas, and to temporarily store product until it can be brought to shore for refining and marketing. In many cases, the platform contains facilities to house the workforce as well.

Depending on the circumstances, the platform may be fixed to the ocean floor, may consist of an artificial island, or may float.

Remote subsea wells may also be connected to a platform by flow lines and by umbilical connections; these subsea solutions may consist of single wells or of a manifold centre for multiple wells.

History
Around 1891 the first submerged oil wells were drilled from platforms built on piles in the fresh waters of the Grand Lake St. Marys (a.k.a. Mercer County Reservoir) in Ohio. The wide but shallow reservoir was built from 1837 to 1845 to provide water to the Miami and Erie Canal.

Around 1896 the first submerged oil wells in salt water were drilled in the portion of the Summerland field extending under the Santa Barbara Channel in California. The wells were drilled from piers extending from land out into the channel.
In the early 1930s the Texas Company developed the first mobile steel barges for drilling in the brackish coastal areas of the gulf.

Larger lake- and sea-based offshore platforms and drilling rigs are some of the largest moveable man-made structures in the world. There are several types of oil platforms and rigs:

Fixed platforms

These platforms are built on concrete or steel legs, or both, anchored directly onto the seabed, supporting a deck with space for drilling rigs, production facilities and crew quarters. Such platforms are, by virtue of their immobility, designed for very long term use (for instance the Hibernia platform). Various types of structure are used, steel jacket, concrete caisson, floating steel and even floating concrete. Steel jackets are vertical sections made of tubular steel members, and are usually piled into the seabed. Concrete caisson structures, pioneered by the Condeep concept, often have in-built oil storage in tanks below the sea surface and these tanks were often used as a flotation capability, allowing them to be built close to shore (Norwegian fjords and Scottish firths are popular because they are sheltered and deep enough) and then floated to their final position where they are sunk to the seabed. Fixed platforms are economically feasible for installation in water depths up to about 1,700 ft (520 m).

Compliant towers

These platforms consist of slender flexible towers and a pile foundation supporting a conventional deck for drilling and production operations. Compliant towers are designed to sustain significant lateral deflections and forces, and are typically used in water depths ranging from 1,500 to 3,000 feet (460 to 910 m).

Semi-submersible platform

These platforms have hulls (columns and pontoons) of sufficient buoyancy to cause the structure to float, but of weight sufficient to keep the structure upright. Semi-submersible platforms can be moved from place to place; can be ballasted up or down by altering the amount of flooding in buoyancy tanks; they are generally anchored by combinations of chain, wire rope or polyester rope, or both, during drilling or production operations, or both, though they can also be kept in place by the use of dynamic positioning. Semi-submersibles can be used in water depths from 200 to 10,000 feet (60 to 3,000 m).

Jack-up drilling rigs

Jack-up Mobile Drilling Units (or jack-ups), as the name suggests, are rigs that can be jacked up above the sea using legs that can be lowered, much like jacks. These MODUs (Mobile Offshore Drilling Units) are typically used in water depths up to 400 feet (120 m), although some designs can go to 550 ft (170 m) depth. They are designed to move from place to place, and then anchor themselves by deploying the legs to the ocean bottom using a rack and pinion gear system on each leg.

Drillships

A drillship is a maritime vessel that has been fitted with drilling apparatus. It is most often used for exploratory drilling of new oil or gas wells in deep water but can also be used for scientific drilling. Early versions were built on a modified tanker hull, but purpose-built designs are used today. Most drillships are outfitted with a dynamic positioning system to maintain position over the well. They can drill in water depths up to 12,000 ft (3,700 m).

Floating production systems

The main types of floating production systems are FPSO (floating production, storage, and offloading system). FPSOs consist of large monohull structures, generally (but not always) shipshaped, equipped with processing facilities. These platforms are moored to a location for extended periods, and do not actually drill for oil or gas. Some variants of these applications, called FSO (floating storage and offloading system) or FSU (floating storage unit), are used exclusively for storage purposes, and host very little process equipment. This is one of the best sources for having floating production.The world’s first Floating Liquefied Natural Gas (FLNG) facility is currently under development. See the section on Particularly large examples below.

Tension-leg platform

TLPs are floating platforms tethered to the seabed in a manner that eliminates most vertical movement of the structure. TLPs are used in water depths up to about 6,000 feet (2,000 m). The “conventional” TLP is a 4-column design which looks similar to a semisubmersible. Proprietary versions include the Seastar and MOSES mini TLPs; they are relatively low cost, used in water depths between 600 and 4,300 feet (180 and 1,300 m). Mini TLPs can also be used as utility, satellite or early production platforms for larger deepwater discoveries.

TLPs are floating platforms tethered to the seabed in a manner that eliminates most vertical movement of the structure. TLPs are used in water depths up to about 6,000 feet (2,000 m). The “conventional” TLP is a 4-column design which looks similar to a semisubmersible. Proprietary versions include the Seastar and MOSES mini TLPs; they are relatively low cost, used in water depths between 600 and 4,300 feet (180 and 1,300 m). Mini TLPs can also be used as utility, satellite or early production platforms for larger deepwater discoveries.

TLPs are floating platforms tethered to the seabed in a manner that eliminates most vertical movement of the structure. TLPs are used in water depths up to about 6,000 feet (2,000 m). The “conventional” TLP is a 4-column design which looks similar to a semisubmersible. Proprietary versions include the Seastar and MOSES mini TLPs; they are relatively low cost, used in water depths between 600 and 4,300 feet (180 and 1,300 m). Mini TLPs can also be used as utility, satellite or early production platforms for larger deepwater discoveries.

Gravity-based structure

A GBS can either be steel or concrete and is usually anchored directly onto the seabed. Steel GBS are predominantly used when there is no or limited availability of crane barges to install a conventional fixed offshore platform, for example in the Caspian Sea. There are several steel GBS in the world today (e.g. offshore Turkmenistan Waters (Caspian Sea) and offshore New Zealand). Steel GBS do not usually provide hydrocarbon storage capability. It is mainly installed by pulling it off the yard, by either wet-tow or/and dry-tow, and self-installing by controlled ballasting of the compartments with sea water. To position the GBS during installation, the GBS may be connected to either a transportation barge or any other barge (provided it is large enough to support the GBS) using strand jacks. The jacks shall be released gradually whilst the GBS is ballasted to ensure that the GBS does not sway too much from target location.

Spar platforms

Spars are moored to the seabed like TLPs, but whereas a TLP has vertical tension tethers, a spar has more conventional mooring lines. Spars have to-date been designed in three configurations: the “conventional” one-piece cylindrical hull, the “truss spar” where the midsection is composed of truss elements connecting the upper buoyant hull (called a hard tank) with the bottom soft tank containing permanent ballast, and the “cell spar” which is built from multiple vertical cylinders. The spar has more inherent stability than a TLP since it has a large counterweight at the bottom and does not depend on the mooring to hold it upright. It also has the ability, by adjusting the mooring line tensions (using chain-jacks attached to the mooring lines), to move horizontally and to position itself over wells at some distance from the main platform location. The first production spar was Kerr-McGee’s Neptune, anchored in 1,930 ft (590 m) in the Gulf of Mexico; however, spars (such as Brent Spar) were previously used as FSOs.

 Posted by at 09:20
Dec 292011
 

A floating production, storage and offloading (FPSO) unit is a floating vessel used by the offshore industry for the processing of hydrocarbons and for storage of oil. A FPSO vessel is designed to receive hydrocarbons produced from nearby platforms or subsea template, process them, and store oil until it can be offloaded onto a tanker or transported through a pipeline. FPSOs are preferred in frontier offshore regions as they are easy to install, and do not require a local pipeline infrastructure to export oil. FPSOs can be a conversion of an oil tanker or can be a vessel built specially for the application. A vessel used only to store oil (without processing it) is referred to as a floating storage and offloading vessel (FSO).
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Oil produced from offshore production platforms can be transported to the mainland either by pipeline or by tanker. When a tanker is chosen to transport the oil, it is necessary to accumulate oil in some form of storage tank such that the oil tanker is not continuously occupied during oil production, and is only needed once sufficient oil has been produced to fill the tanker. At this point the transport tanker connects to the stern of the storage unit and offloads oil.
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In the early days, the storage units consisted of decommissioned oil tankers, which were stripped down and equipped with process/production facilities (becoming therefore FPSOs), and were connected to a permanent mooring point. Today, there are two main types of FPSOs, those built converting an existing oil tanker, and those that are purpose-built. The FPSO design will depend on the area of operation. In benign waters the FPSO may have a simple box shape or it may be a converted tanker. Generally (but not always) the production lines (risers) are connected to a major component of the vessel, called a Turret, which allows the vessel to rotate in order to head into the wind and reduce environmental forces on the moorings. In relatively calm waters, such as in West Africa, turrets can be located externally to the ship structure, hanging off the bow of the FPSO. For harsher environments like the North Sea, the turret is generally located internally. The turrets and the mooring systems can be designed to be disconnectible or to remain permanently moored. Most ship-shaped FPSOs in the North Sea are purpose-built and are permanently moored.While most FPSOs are ship-shaped, some FPSOs have a semi-submersible type hull with storage (very rare), or have a cylindrical hull. The inherent symmetry of these FPSO configurations makes turrets unnecessary, so the platforms remain in a fixed orientation.

An FPSO has the capability to carry out some form of separation process. If the unit does not have such facilities, it is generally referred to as a Floating Storage and Offloading unit (see below), and would be operated in conjunction with a production platform. Process plant on FPSO is a core component on facility and forms a key part of production process. Production is usually conducted in 3 phases:

  1. Separation of Gas.
  2. Separation of Water.
  3. Separation of oil.

Gas recovered/separated during production may be used as fuel on Marine energy resource units ( MRU) fitted on board. Gas may be flared off in some cases if MRU is not fitted. Water separation may be carried out using Dehydrators or Hydro Cyclones.

Floating production, storage and offloading vessels are particularly effective in remote or deepwater locations where seabed pipelines are not cost effective. FPSOs eliminate the need to lay expensive long-distance pipelines from the oil well to an onshore terminal. They can also be used economically in smaller oil fields which can be exhausted in a few years and do not justify the expense of installing a pipeline. Once the field is depleted, the FPSO can be moved to a new location. In areas of the world subject to cyclones (northwestern Australia) or icebergs (Canada), some FPSOs are able to release their mooring/riser turret and steam away to safety in an emergency. The turret sinks beneath the waves and can be reconnected later.

 Posted by at 12:20
Dec 252011
 

What is Dredging?

Ships are giant structures and we know that a substantial portion of the ship has to be underwater to displace equivalent weight and that is how ships float on water. At some places there might not be deep water sufficient to support all types of ships of different sizes. Hence there needs to be an artificial way to increase the depth of the seabed and this can be achieved by dredging.

Dredging is a process of digging the seabed, by scraping or sucking. It is mainly done either to increase the depth of the area to make it navigable for ships or to collect sand to dispose it to some other areas. The ships used for these purposes are known as dredgers.

Though dredging is useful it can create some adverse marine environmental problems. Dredging induces coastal erosion and destroy the marine life flourishing on the seabed.

Different Applications

Dredgers are not just used for the digging purpose but for various other applications too. Water Dredgers are mainly used for excavation purposes to increase the depth of water ways to allow larger ships to access them. Apart from that they are also used in drilling, fishing and land reclamation purposes. Dredging is used to procure edible crabs and other sea organisms. Dredgers are used to replenish beaches where the sand is continuously eroded due to repetitive wave action and winds. They are also used for obtaining precious elements and minerals from the sea bed. Some dredgers are used to make new ports and artificial islands by scraping ocean beds and using that material.
Dredgers are used to remove the land from the areas which are contaminated by oil spills or other poisonous chemical leakages. They are also used to remove man made contaminants such as trash and other non degradable material from the sea bed, especially in the harbors.

Types of Dredgers – Trailing Hopper Suction Dredger

They are generally used for increasing the depth of the water ways and for land replenishment purposes. They consist of two long and flexible pipes that drag on the seabed. These pipes are adjustable and are attached to collecting holds known as hoppers. Pipes suck a mixture of land and water from the sea floor with the help of suction pumps. The mixture is collected in the holding tanks and allowed to settled down. Water comes on the surface and heavy sediments settle down. Water is thrown out with the help of pumps. The two flexible pipes are suspended with the help of special cranes in such a way that the sucking nozzles always stay in contact with the sea surface.
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The discharging of the material is done when the holds are full. This is done either by opening the bottom dumping flaps, which are opened on reaching the disposing site, or by using pumps to discharge it through the nozzles . The process of discharging the material through the nozzles is known as rainbowing. To facilitate the discharging process by opening of the discharge flaps, some dredgers are constructed using two hinged port, which separates the ship from middle, into two halves. These rails are called split rail suction dredgers.

Cutter Suction Dredgers

Certain ocean floors cannot be sucked or scraped. They are so tough that first they are cut and broken and then sucked or scraped. The vessels used for these purposes are known as cutter suction dredgers. They are used for creating new water ways or ports.Cutters are rotating wheels which are used to cut the hard land into small pieces. These cutters are suspended with the help of movable poles that reaches up to the ocean floors. These types of dredgers do not have cutters to collect the broken materials. The broken and loosened soils are washed away with the help of dredging pumps. The soil can also be collected in barges which can be later transported to the disposing site.
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These dredgers have there own propulsion system, but whenever cutting is to be done, spud poles are used to temporarily fix the vessels. This facilitates the vessel to generate a swinging motion which helps in the cutting process.

 Posted by at 09:44
Nov 242011
 

csd-500.JPGOn 16th November 2011, the Al Jadaf Dockyard, Dubai witnessed a colorful launching ceremony of the newly built second Cutter Suction Dredger (CSD 500) which is constructed by APT Global Shipyard on behalf of VostaLMG.

The Management of APT Global and Representatives of VostaLMG congratulated all the team members and supporters on this auspicious occasion for bringing a dream into reality by constructing Two Dredgers within a period of six months.

The contract for construction of the two vessels was signed between VostaLMG and APT Global Shipyard in May 2011, and the keel was laid on 2nd June 2011. The CSD 500 is engineered by VostaLMG and fully constructed by APT Global Marine Services LLC.

Vessel Information

Type: CUTTER SUCTION DREDGER 500

Ship Builder:                   APT Global Marine Services LLC
Length Overall: 38 meters
Breadth over pontoon:         2.75 meters
Dredging Depth: min. 2- / max. 15 meters
Discharge Diameter: 500 mm
Total Installed Power:         1270 Kilowatt
Cutter Power:                   175 Kilowatt
Pump Power:                     950 Kilowatt
Class:                                Bureau Veritas

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 Posted by at 15:15
Oct 192011
 

v.JPGA small step in dredger construction, a giant leap for APT Global.

The Cutter Suction Dredger CSD500 is one of the standard dredgers within the range of well-proven high quality cutter suction dredgers. It has been designed for a max dredging depth of 15 m and has a max mixture capacity of 760 ltr/min. The fully dismountable dredger has a total installed power of 1.299 kW to ensure that all functions can be operated simultaneously. The winches, spuds and cutter are hydraulically driven.

The Cutter Suction Dredger CSD500 is of a heavy-duty design and only high quality equipment is used. The standard design can be enhanced by a large number of options.

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 Posted by at 13:33
Aug 152011
 

The excavation carried out in either shallow or fresh waters with the aim to gather up the sediments located in the bottom to dispose them off at another place is called Dredging. Find out about different types of dredgers used in the maritime industry.

The sediments might be gathered for purposes like:

1.Making the water navigation or fishing easier in shallow waters

2.For replenishing the sand on public beaches which might have undergone severe coastal erosion

3.Gold and coal mining

4.Removal of contaminants from the sea bed

5.Reclamation of areas damaged by oil spills or natural calamities

6.Creation of new harbors

Although dredging can have very harmful effects on the marine and aquatic environment, in some situations it may be the only option available. The device used for excavation and scraping of the sea bed is called the Dredge and the ship or vessel a dredge is fitted to is known as a Dredger although these terms now days are used interchangeably.
Broadly the types of dredgers are classified into three categories; Mechanical dredgers which are suited for working in confined areas and are useful for removing the hand-packed material or debris, Hydraulic dredgers which work on the principle of adding large amounts of process water to change the original structure of the sediments, and Other dredgers which do not fit in to the above two categories.

Whether mechanical or hydraulic, the different types of dredgers that help in removal of the seabed sediments are.

Trailer Suction Hopper Dredgers

Suitable mostly for harbor maintenance and pipe trenching, a hopper dredger is a self-propelling vessel that holds its load in a large onboard hold knows as the hopper. They can carry the load over large distances and can empty it by opening the bottom doors or by pumping the load offshore. Hopper dredges mostly dredge the soft non-rock soils and because of their high production rates can carry out land reclamation projects easily.
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Cutter Section Dredger

CSD, as they are normally called, have a cutter head at the suction inlet which helps to loosen the earth and take it to the suction mouth. Used for hard surfaces like rock, CSDs suck up the dredged soil with the help of wear-resistant pump and then discharge it through a pipeline or a barge.
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Bucket Ladder Dredgers

The bucket ladder dredgers use a series of buckets that are mounted to a wheel, which then using mechanical means pick up the sediments. They can be used for wide variety of materials including soft rock material and are powerful enough to rip out the corals as well. But because of their low production, high level of noise and the need for anchor lines, their use has hugely diminished in the recent times.

Backhoes

Like some onshore excavators, Backhoe dredgers have a digging bucket attached to it which digs through a wide range of materials and when it is excavated it’s brought out and placed on the onboard barges. Although they have few limitations where deep dredging is concerned but with some recent modern dredgers, deeper excavation is made quite easy.
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Grab Dredgers

A revolving crane, fitted with a grab, placed on a hopper vessel or pontoon is known as a grab dredger. As the name suggests, it picks up the sediments at the seabed with a clam grabbing motion and discharges the contents. Often used for excavating bay mud it also is useful to pick up clays and loose sand.

Water Injection Dredger

Often used for environmentally sensitive projects, water injection dredgers work by fluidizing the material by pumping water into the bed material. Once it is fluidized it is either moved by a second burst of water or is carried away by natural current.
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Bed Leveler Dredger

Working on a similar line as a bulldozer on land, the bed leveler dredger has a blade attached to the back of a vessel which is then pulled to level the seabed.

 Posted by at 07:33