Like It Or Not; It’s Here
Fighting LNG Ship Fires
Originally Published Sept 2007
By Tom Guldner, Marine Firefighting Inc.
First, let me state that this article is neither FOR nor AGAINST Liquid Natural Gas (LNG) in the USA. Its purpose is to understand what it is and how the vessels crew and Land-Based Firefighters and first responders can deal with emergencies. Opponents of LNG have come up with many false statements about the dangers of LNG while the LNG industry may lead us to believe there is absolutely no danger in handling LNG. We as firefighters (marine or land-based) and as the mariners who work with the LNG vessels must look at this issue in a more unbiased view. Anything is dangerous if used improperly. Even water has been found to be the culprit of many devastating oil tanker explosions when used under pressure to clean the vessels tanks. The static electric charge the water builds up can create a spark which can rip apart a huge oil tanker. We have also seen that water has caused many vessels to capsize and sink when too much of it has accumulated aboard a ship during firefighting operations.
My company, Marine Firefighting Inc., has been involved in providing informational seminars to the tug boat crews who have the task of escorting some of the large LNG ships into US waters. The tug boats being used are specially designed for this task. Each is equipped with state of the art firefighting equipment. MFI has been providing the familiarization with this new firefighting equipment and also familiarization with the properties of the LNG they will be working with.
Much controversy surrounds the Liquid Natural Gas (LNG) industry in the United States. A good deal of the criticism comes from the “Not in my back yard” syndrome. Most of us realize that our energy needs will soon outpace our supplies. With new emerging economies such as China and India the world’s existing oil reserves are going to be drawn upon much more than at any time in our history. LNG has been presented as one of the answers of bridging the eminent energy gap between users and suppliers. However, no one wants to live next door to an LNG plant.
What is LNG? Liquid Natural Gas (LNG) is a colorless, odorless, liquid which is natural gas in a liquid form. Previously, the world’s large supplies of natural gas have not been available to areas remote from these gas wells. The cost of shipping natural gas in its gaseous state was simply too expensive. Liquefying natural gas reduces its volume 600 times (see diagram left.). Because of this reduction in volume it became profitable to export natural gas in its liquid form (LNG). The process of liquefying natural gas differs from the liquefying of other gasses. The main difference is that LNG does not require pressurization to keep this gas in a liquid state as is the case with Liquid Petroleum Gases (LPG) such as Propane. (Marine transport of Propane may use refrigeration to reduce its pressure during transit.) LNG is formed by subjecting natural gas to extremely cold temperatures. At minus 260 degrees F (-161°C ) the gas becomes a liquid at atmospheric pressure. Liquids at these temperatures are considered “Cryogenic”.1 [Continue Reading →]
