LNG – safe, clean and economicalFuel oil and gas oil will soon be replaced by new fuels. Due to the serious environmental impact of “special waste disposal at sea”, they are expecting it to come to an end sooner rather than later. Alone the huge burdens on coastal China will lead to heavier restrictions in that area. Such restrictions are already in place on European and American seas – and in future they will be extended and tightened.
LNG – short for liquefied natural gas – is quickly becoming the alternative of choice. The reason is twofold: firstly, the drastic reduction in emissions compared to fuel oil.
Secondly, the LNG can be used as an alternative fuel already without any problems. In principle, using gas as a fuel doesn’t cause additional requirements of modern combustion engines. For years now, road vehicles such as cars, buses and lorries have been fuelled by liquefied gas. As with these vehicles, there are two solutions in shipping: the use of pure gas on the one hand; on the other, conventional fuel – e.g. marine diesel – in combination with LPG. All leading engine suppliers already offer a wide range of engines that are dual-fuel optimised.
As well as an engine optimised for gas combustion, the storage of fuel on board is an important aspect of the LNG power system. During LNG production, natural gas is liquefied at -162°C to reduce it to one six-hundredth of its initial volume. This allows one cubic metre of natural gas to be stored in a container the size of a 1.5 litre water bottle. It is transported in insulated tanks to the user. This requires LNG-optimised tanks on board. Different types of tank exist. Which type is most suitable depends on specific requirements.
The higher initial investment required for LNG is offset by a number of compelling advantages:Considerable reduction in parcitulates emissions, sulphur, nitrous oxides, and CO2Fulfilling the stricter emissions limits (SECA) guarantees operation in the affected areas, which will be extended in futureLNG motors are lower maintenance and quieterLNG is cheaper than oil-based fuels, with a higher energy yield than fossil fuels
LNG ready - the right choice for newbuildsFor ships operating mostly outside the regulated zones, there is often no pressing economic need to invest in dual-fuel or single-fuel gas. Nevertheless, newbuilds are increasingly being designed so as to facilitate retrofitting of dual fuel – i.e. use of marine diesel and LNG. To allow this, special care and attention during the concept development and design phase are given to:Type of LNG fuel tank, location and volumeCapture and discharge of boil-off gasDesign and positioning of the refuelling connectorsPiping for supplying engines with fuel gasAlignment of the engine roomRequirements of the ventilation facilityAdjustment of the safety plans to suit gas-fuelled shipsTECHNOLOG possesses wide-ranging experience in advising ship-builders and owners on the special requirements of LNG-ready newbuilds. TECHNOLOG’s specialists are also in high demand for project supervision and realisation of LNG projects.
LIQUEFIED NATURAL GAS
LNG as fuel:Safe, cost-effectiveand eco-friendly
TECHNOLOG supports UASC in building 17 mega-container shipsFrom the first design to delivery of the last unit, TECHNOLOG supported United Arabic Shipping Company (UASC) to assemble the world’s largest fleet of LNG-ready container ships. One of these was the UASC BARZAN. 400 metres long, and close to 50 metres wide, it is one of the largest ships in the world.
Dual-fuel propulsion right from the beginningNewbuilds that mostly travel within Emission Control Areas (ECA) – such as the North-Western Europe ECA – should be equipped with dual-fuel motors straight away. The advantages are obvious: not only do they fall considerably below the MARPOL thresholds for sulphur dioxide, nitrogen oxide and particulates, but the higher initial investment is recovered through use of LNG within just a few years.
„Highly modern, ultra-large container ships allow us to reduce CO2 emissions per container significantly,” said Jorn Hinge, President and Chief Executive Officer of UASC.According to TECHNOLOG Director Hans-Jürgen Voigt, CO2 emissions per standard container will lie “considerably below that of 13,500 TEU container ships” that run on conventional motors and were produced as recently as three years ago. All 17 newbuilds, he says, are built with quick, cost-efficient LNG retrofitting in mind.
Source: THB 20.05.2015
Dual-fuel-powered newbuild RV ATAIR – TECHNOLOG supports Fassmer shipbuilders in constructing new research shipNews 12/2016: This week, Fassmer received an order for a new hydrographic surveying, wreck-seeking and research vessel from the Federal Maritime and Hydrographic Agency of Germany. After completion, this ship will replace the current ATAIR in 2020. The 74m-long, nearly 17m-wide newbuild will be equipped with a gas/diesel propulsion system so that it can be fuelled by low-emission LNG, allowing it to fulfil all requirements of the German “blue angel” eco-friendliness certification. The new ATAIR will be the world’s first LNG-fuelled sea-going ship owned by a public administration and the largest vessel within the Agency’s fleet. The ship boasts comprehensive scientific equipment (wet and dry laboratories, working deck, winches, A-frames, cranes etc.) and is perfectly suited to service in the North Sea, Baltic and North-East Atlantic.The ship will be deployed for hydrographic surveys and wreck-seeking, and will also conduct tasks associated with maritime environmental monitoring. Along with the 18-person crew, there is space for a further 15 people on board. The Hamburg engineering practice TECHNOLOG services GmbH assisted Fassmer during the general planning of the ideal integration of the scientific and technical facility, the concept description, and the concept visualisation, as well as during the development and positioning of the research and surveying equipment for this new, highly innovative ship. The co-operation will continue during the newbuild’s construction and building phases.
LNG-ready and ready-to-build – STREAM designs by TECHNOLOGBuilding on our extensive hands-on experience and intensive development work, TECHNOLOG engineers have developed standardised concepts for LNG-propelled ships. Not only the engines, but also the optimisation of the ship’s hull is central. Further, various solutions for fuel storage have been developed: from a pressure tank within the hull, to a highly flexible fuel container that can be driven onto the deck. Whether a tug, a research vessel conceived as an ice-breaker, an offshore supplier, a passenger ferry or a mega container-ship – TECHNOLOG’s designs are detailed but flexible enough to be modified, and can thus be implemented extremely quickly.Unsurprisingly, one of these is a concept for an LNG tanker for ship-to-ship refuelling – which is itself dual-fuel: