Fig:LNG carrier underway
Overall, a LNG ship carries natural gas product under storage conditions at a volumetric ratio of
approximately 600 times that of the product at STP conditions. This is achieved with storage
conditions of -260°F (-162°C) and atmospheric pressure. Large ships of this type carry
approximately 3.0 BCF and more of natural gas.
Specific distillates of natural gas, Butane and Propane, both also produced from crude oil refining,
are gaseous at ambient temperature and pressure and yet are liquid when stored and transported
under modest pressure or in a moderate refrigerated state (hence the name LPG).
LPG ships have been developed to utilise these particular properties, being either pressurised,
fully-refrigerated, or semi-refrigerated (trade as both pressure and refrigerated storages)
Fig:CNG ship at sea
Compressed Natural Gas (CNG) has also been developed as a shipping concept, relying on the
high pressure containment technology used in conventional pressure vessel CNG storage and in
pipeline systems to provide a form of concentrated gas storage which can be fitted onboard ships.
The CNG concept that has been around for a long time, seeks to offer savings by removing the
need for the expensive onshore refrigeration trains required for LNG.
However, CNG still needs
separate gas conditioning and process systems to get the production gas segregated and suitable
for transportation. A separate LPG processing and transportation system is also needed.
CNG carriers are a cost effective, reliable and safe alternative
to the traditional ways of transporting natural gas via subsea
pipelines or Liquefied Natural Gas (LNG) carriers.
When circumstances allow it,
pipelines provide the best option for transporting gas over short
distances, while Liquefied Natural Gas carriers offer various
advantages for large quantities of natural gas to be transported
over long distances.
With the innovative concept of the Coselle CNG
Carriers, which utilize Coselles, a new technology consisting of
large coils of pipes wound into a cylindrical storage container to
contain compressed natural gas, gas producers are being offered an
economically optimal solution for the transportation of moderate
volumes of natural gas over medium distances.
Thus, the Coselle CNG
carrier is the first method supporting this segment of the marine
gas transportation market that is not economically served by
pipelines or LNG ships.
The CNG carriers will provide the market with a safe, reliable and
cost effective method to transport natural gas by sea and also
deliver natural gas to underserved markets.
However, alternative gas transportation technologies exist which avoid the extremely low
temperatures and expensive onshore liquefaction trains, or the high pressure containment
systems, and offer more modest containment requirements better suited to raw production gas
handling, sea transportation and pipeline quality gas delivery to market.
Defining various gas carrier types
Fuel flexibility of LNG ships
LNG ship spillage risk
Initial Cool Down of cargo tanks
Leaks on the Cargo System, Continuous Flow - how to prevent
LNG tank leaks and immediate action by gas carriers
Leaks from a Loading Arm due to Tidal or Current Effects
Minor or major leaks from LNG tanks
Procedures for LNG cargo loading
Procedures for LNG cargo discharging
- Benifits of compressed gas technology
- Development and potential of todays emerging gas technologies
- Transporting economically viable compressed gas liquids from remote fields
- Increased Cargo Capacity for LNG ships & Advantages of the dual fuel diesel electric propulsion
- The Steam driven LNGCs & fuel option
- Duel fuel electrical propulsion system for LNG ships
- The sea transport of liquefied gases in bulk -Where do the products come from ?
External links :
www.lngfacts.org/ : Center for Liquefied Natural Gas - Provides information on liquefied natural gas, US energy demand, and how LNG can help to safely diversify and expand our energy supply.
// Home page
Copyright © Liquefied Gas Carrier.com All rights reserved.
The content published in this website are for general reference only. We have endeavoured to make the information
as accurate as possible but cannot take responsibility for any errors. For latest information please visit www.imo.org .
Any suggestions, please Contact us !
///Links &Resources //