Inert Gas
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- Unique Spillstop— Advanced Oil Spill Avoidance System Maritime Reporter, Nov 1991 #20
An American underpressure system called Spillstop is an advanced spill avoidance system for oil tankers.
It employs slight, continuous, and pre-existing underpressure in a medium of inert gas of the ullage space of a ship's tank. Spillstop responds immediately in the event of an accidental hull rupture, according to MH Systems, Inc., which offers the system. From this baseline underpressure, timely reaction of the system is crucial.
Other underpressure systems on the market perform quite the opposite from Spillstop. No underpressure initially exists. These systems only begin to create underpressure with pumps after a rupture of the tanker's hull.
In the Spillstop system, the maximum underpressure is never allowed to exceed the structural capability of any tanker. Older tanker structures are thoroughly inspected, tested and analyzed prior to system installation. A comprehensive analysis by Dr. A. Mansour, professor of naval architecture and ocean engineering at the University of Cal lifornia, Berkley, and a noted expert in the field of structural analysis, has shown that, "effects of negative pressure on tanker structure" are insignificant.
According to California-based MH Systems, the Spillstop system maintains the IMO Inert Gas requirement as all times, even at the time of rupture. The Inert Gas system is a mandatory requirement for all tankers in excess of 20,000 tons in order to prevent accidental combustion and explosion.
The Spillstop system maintains the inert gas mixture under negative pressure. A general misconception is that an inert gas mixture cannot be effectively maintained under negative pressure. Not only can the mixture be maintained inert, claims MH Systems, but its effectivity is insensitive to variations in pressures. It is irrelevant to prevention of combustion or explosion whether the inert gas mixture is at a positive pressure or a negative pressure. Spillstop continuously compensates for ingress of oxygen due to leakage by introducing additional inert gas—the procedure that is currently followed in the positive pressure system for maintaining a specified inert gas mixture ratio.
Spillstop is computer controlled and totally automated with minimal need for human intervention.
The system can be considered both a wholly new physical formulation and a new high tech implementation of the existing inert gas systems that are already in place in oil tankers.
MH Systems reports that Spillstop eliminates potential boiloff of the volatile cargo by maintaining the underpressure value less than the cargo's vapor pressure.
For free literature detailing Spillstop, Circle 1 4 0 on Reader Service Card
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- Airfilco Appoints Kevin McPherson Maritime Reporter, Sep 1977 #33
for the commissioning and servicing of inert gas systems and generators. The appointment is part of Airfilco's overall backup program for inert gas systems presently being supplied in the United States at Avondale Shipyards, Inc., National Steel and Shipbuilding Company, and Sun Shipbuilding and
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- Interocean Conducts Inert Gas Course Maritime Reporter, Oct 1977 #36
Interocean Management Corporation, Three Parkway, Philadelphia, Pa. 19102, recently arranged the first "Inert Gas and Supporting Systems for Tanker Safety" training course to be offered in the United States. The four-day course is for deck and engineering officers sailing on new Americanbuilt VLCCs
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- Tankers To Install AIRFILCO Engineering Inert Gas Systems Maritime Reporter, Jan 1977 #16
AIRFILCO Engineering of New Orleans, La., has been awarded the contract to furnish two AIRFILCO Inert Gas Systems for the EXXON, U.S.A. tankers under construction at Avondale Shipyards, Inc. This is the second such contract for AIRFILCO Engineering, Inc., the first being the four AIRFILCO Inert
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- Mobil Oil Retrofits Tankers With Coppus Inert Gas Systems Maritime Reporter, Apr 1974 #30
Corporation, Worcester, Mass., licensee of Fredriksstad Mek Verksted (FmV), announces the plaoement of an order by Mobil Oil for several FmV Inert Gas Systems to foe retrofitted on Mobil ships now in operation. FmV Inert Gas Systems utilize scrubbed flue gas to maintain tank atmospheres at nonexplosi
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- Alfa Laval: New Test Facilities, New Technologies Maritime Reporter, May 2017 #66
added a further 1100 cubic meters of test space to focus on combustion technologies for gas and other fuels including the installation of new burner and inert gas systems as well as the full-scale Alfa Laval Gas Combustion Unit (GCU). “Our investment in the Alfa Laval Test & Training Center reflects the
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- M a r i t i m e Overseas A w a r d s Contract To A i r f i l co Engineering Maritime Reporter, May 1977 #10
Airfilco Engineering, Inc. of New Orleans, La., has recently been awarded the contract to furnish four Airfilco Inert Gas Systems for the Maritime Overseas Corp. tankers under construction at National Steel and Shipbuilding Company in San Diego, Calif. This is the third such contract for Airfilco
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- Foster Wheeler Reprint Outlines Development Of Inert Gas Systems Maritime Reporter, Jul 1978 #28
," an article reprint from the Foster Wheeler organization's technical publication, "Heat Engineering." The article outlines the development of inert gas systems in blanketing hazardous cargoes, then goes on to describe the two configurations offered under license from Moss Rosenberg of Norway
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- French Naval Ship Installs AIRFILCO Inert Gas Blanketing System Maritime Reporter, Mar 15, 1977 #25
The U.K. affiliate of AIRFILCO Engineering, Inc. of New Orleans, La., recently completed installation of an inert gas blanketing system onboard the naval supply ship Durance. AIRFILCO, whose systems are presently being installed on Sohio, Exxon and British Petroleum tankers at Avondale and Sunship
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- ABS Guidance for Ballast Tank Inert Gas Systems Maritime Reporter, Jul 2004 #11
for complying with design criteria and procedures for inerting ballast tanks on double hull tankers. The timely introduction of the ABS Guide For Inert Gas System For Ballast Tanks addresses industry concerns regarding the potential leakage of volatile gases from oil laden cargo tanks into the ballast
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- Foster Wheeler To Supply Inert Gas Systems For LNG Tankers At Quincy Maritime Reporter, Oct 15, 1978 #10
South Orange Avenue, Livingston, N.J. 07039, has received a contract from the Quincy Shipbuilding Division of General Dynamics Corporation to supply inert gas generators and dry air plants for two liquefied natural gas (LNG) tankers under construction by the Massachusetts shipbuilder. Value of the contract
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- Inert Gas Systems Fitted Aboard Tankers Building At NASSCO Maritime Reporter, Aug 15, 1977 #20
systems fitted aboard the Shipmor Associate Tankers building at National Steel and Shipbuilding Company, San Diego, Calif. The decision to fit the inert gas systems was taken during March 1977, and the systems were designed, built, fitted and commissioned before the end of June in order that the
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