Marine CNG Storage Technology

CNG Optimum

GEV’s Optimum Technology is the result of two decades of development in marine CNG

The Optimum Technology maximizes the amount of Compressed Natural Gas that can be stored within the hull of a ship. The Optimum containment system is constructed using close-packed, high strength pipes that run the entire length of the ship’s cargo hold. The invention of a mechanism to clamp these gas storage pipes so tightly together that they become locked together as one, allows this design to meet all classification requirements.

The 200MMscf CNG Optimum ship has received Approval in Principle from the American Bureau of Shipping (ABS) and is undergoing an extensive design and testing program. The test pipe required for the ABS Approval has been delivered to Edmonton, Canada from Japan. The pipe will undergo a sequence of tests to demonstrate that it meets all of the ABS requirements to assure a safe and reliable CNG Optimum Ship. The testing program and approval is on-track for completion in September 2018.

Highlight for details of the CNG Optimum 200MMscf Ship

The Marine CNG Service Model

Marine CNG is the transportation by ship of natural gas stored under pressure. For this purpose natural gas is simply mechanically compressed, as it is in a pipeline. Unlike Liquefied Natural Gas (LNG), CNG does not require complex and expensive liquefaction facilities.  CNG is much simpler, less expensive and has a significantly smaller footprint. The result is that CNG can provide an attractive marine transportation solution, which is easier and quicker to permit and implement for the transportation of smaller volumes of gas over shorter distances.

The model for a marine CNG service uses a select number of ships on a given route to shuttle natural gas between receipt and delivery points on a specific route, much like a passenger ferry service. Loading and discharge of gas may be carried out onshore or offshore.

CNG Markets

Natural gas is the fuel of choice for thermal power generation and many industries because it is cost effective, easy to handle and efficient. In addition, markets are increasingly demanding natural gas to respond to public pressure to reduce emissions by using cleaner burning fuels.

While they will continue to carry the bulk of natural gas transported nationally and internationally, pipelines and LNG have physical and economic limitations.

Marine CNG is an economic alternative for transporting small to moderate volumes of natural gas over medium distances. It is an ideal solution for monetizing lower volumes of gas because it enables producers to access regional markets that may not be economic to serve with pipelines or LNG.

Marine CNG transportation systems, can be better optimized to meet the specific needs of a particular project than a fixed pipeline.  And in locations where financial and political instability may inhibit large-scale infrastructure investment, the ability to redeploy marine CNG assets significantly reduces investment risk.

Environmental Benefits

Natural gas is an essential component to sustainable energy development around the world. The use of CNG as a replacement for heavy fuel oil in power plants significantly reduces all polluting emissions.

  • Carbon Dioxide (CO2) by 29%
  • Oxides of Nitrogen (NOx) by 78%
  • Oxides of Sulphur (SOx) by 99.9%
  • Particulates by 92%

Marine CNG not only supports the expansion of natural gas usage by land-based customers, but enhances the marine environment as well:  The CNG ships themselves are equipped with dual fuel engines and burn natural gas from their own cargo. As a result these ships will be among the cleanest running in the world.

Reducing emissions from the shipping industry is a target for greenhouse gas reduction. Marine CNG custom built ships with gas engine technology will enable fleets to deliver natural gas with minimal environmental impact.