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Topic: Inert gas


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In the News (Sat 17 Aug 19)

  
  Inert gas - Wikipedia, the free encyclopedia
Unlike the noble gases an inert gas is not necessarily elemental and are often molecular gases.
Thus the inert gas is used as a passive preservative, preventing biological decay, while being undetectable to the consumer since taste and olfactory senses require a chemical reaction to take place in order to send a signal to the brain.
In gas metal arc welding inert gases are used to shield the heated metal from the reactive gases in air which can cause undesirable reactions in the metal.
en.wikipedia.org /wiki/Inert_gas   (538 words)

  
 Inert - Wikipedia, the free encyclopedia
In chemistry, the term inert is used to describe something that is not chemically active.
It is now understood that the reason that inert gases are completely inert to basic chemical reactions (such as combustion, for example), is because their outer valence shell is completely filled with electrons.
The inertness of nitrogen is due to the presence of the very strong triple covalent bond in the N
en.wikipedia.org /wiki/Inert   (221 words)

  
 The use of inert gas in winemaking   (Site not responding. Last check: 2007-10-08)
The main purpose to use inert gas in the headspace (ullage) of a wine container is to protect the wine against oxidation and spoilage by yeast and bacteria.
Gas can be taken from the gas cylinder through a regulator that reduces the gas pressure to the maximum that the gas line can handle.
Inert gas is then pushed into the vessel via a tube connected to the wand.
www.smalloak.com /papers/inertgas/inertgas.html   (4374 words)

  
 AllRefer.com - inert gas, Compound & Element (Compounds And Elements) - Encyclopedia
inert gas or noble gas, any of the elements in group 0 of the periodic table.
The low chemical activity of the inert gases is due to the fact that their outermost, or valence, electron shell is complete, containing two electrons in the case of helium and eight in the remaining cases.
The inert gases are sometimes called the rare gases, although argon is not rare (it makes up about 1% of the atmosphere) and helium is commercially extracted from natural gas and the atmosphere.
reference.allrefer.com /encyclopedia/I/inertgas.html   (268 words)

  
 Inert Gas Welding
An inert gas surrounds the arc and shields it from the ambient to prevent oxidation.
Tungsten Inert Gas (TIG) Welding: An arc is truck between a tungsten electrode (non-consumable) and the sheet metal to be welded.
An inert gas shields the arc from the ambient to prevent oxidation.
www.efunda.com /processes/metal_processing/welding_inertgas.cfm   (732 words)

  
 Deaths Involving the Inadvertent Connection of Air-line Respirators to Inert Gas Supplies
Inert gases such as helium, argon, and nitrogen are widely used in industrial settings as fire suppression blankets for flammable work in confined spaces, to operate pneumatic equipment, and to prevent oxidation in industrial processes.
When a respirator’s air line is connected to a source of inert gas rather than to breathable air, the respirator wearer who trusts his/her sense of breathlessness to determine whether he/she is connected to breathing air has little warning before losing consciousness.
The one on the right was labeled “natural gas.” The gas line on the left had a paper tag attached with the word “air” handwritten on it; however, this line actually contained pure nitrogen.
www.osha.gov /dts/shib/shib042704.html   (1605 words)

  
 Risks of Inert Gases   (Site not responding. Last check: 2007-10-08)
Newly assembled equipment which uses inert or any other gas should be thoroughly leak checked by a timed gas pressure drop test, supplemented by testing with an approved leak test fluid which is compatible with the equipment for which it is being used.
All gas welding and heating processes involve taking oxygen from the air and can lead to a deficiency unless the volume of workspaces and their ventilation is sufficient.
Apparatus used for the manufacture, distribution and utilisation of inert gases must be installed and identified in accordance with the recommendations of the industrial gas industry, and must comply with whatever regulations are applicable.
www.bocindustrial.com /safety/gases_risks/risks_of_inert_gases.asp   (1541 words)

  
 [No title]
Once a tank is inerted and the tank openings closed and sealed, inert gas will leak out of the tank at such a small rate that the IGS may need to be operated only intermittently to maintain the inert tank atmosphere.
Since the greatest need for inert gas is during offloading, the blower capacity is set at 125 percent of the maximum rated capacity of the cargo pumps.
To prevent the blowers from overheating when there is no demand for inert gas in the cargo tanks, and to allow gas concentration to be developed during startup, a recirculating line is fitted to return the blower discharge to the scrubber.
www.uscg.mil /HQ/G-M/nmc/pubs/msm/v2/cch5.doc   (8591 words)

  
 Inert gas system
Gas freeing- Opposite to inerting and is the replacement of an inert atmosphere with one of fresh air.
The choice of whether an inert gas system is fitted to a vessel is based on the initial cost of installation and maintenance, the planned cargos to be carried and the possibility of the being tainted by the inert gas and the possibility that the inert gas system in itself will introduce a risk.
The use of the term Inert Gas is a misnomer in so far as the true inert gasses such as Helium and argon are prohibitively expensive to use.
www.marineengineering.org.uk /INERTGAS/igsysMain.htm   (719 words)

  
 Reference Data Sheet on Inert Gases and Atmospheres
Inert gases such as helium or argon are used during welding to prevent oxidation of the metals during the process.
Inert gases are also used in some furnace operations in which metals are processed, in order to reduce or eliminate the production of oxides and scale.
In tank removal operations, it is common to purge such tanks with an inert gas, such as nitrogen or carbon dioxide, to avoid an explosion during removal of the flammable material.
www.meridianeng.com /inertgas.html   (2137 words)

  
 Inert Gases
Also, be sure to see the Inert Gas Devices F.A.Q. It has been a dream of mine to share publicly the research I've been doing for the last eleven years.
The inert gas energy is apparently mono-polar at the 3rd dimensional level.
With the inert gas Neon there is some beneficial effect by increasing energy to the Root Chakra, which seems to improve the immune system, helping to destroy some of these invading organisms.
www.hilarion.com /igd.html   (6361 words)

  
 inert gas articles on Encyclopedia.com   (Site not responding. Last check: 2007-10-08)
inert gas INERT GAS [inert gas] or noble gas, any of the elements in group 0 of the periodic table.
It is prepared in a furnace or generator in which air is forced upward through a burning fuel of coal or coke.
Argon is a colorless, odorless, tasteless gas occurring in air (of which it constitutes 0.94% by volume) and in some volcanic
www.encyclopedia.com /articles/06353.html   (413 words)

  
 Frequently asked MIG & TIG welding questions
It is shielded by inert gas and the feeding wire also acts as the filler rod.
In plasma cutting, a gas such as Nitrogen is sent under pressure through the torch where it begins to swirl and is forced out a small orifice at which point it passes through an electric arc and the gas is ionized.
Inert gas - Used to shield the electric arc from outside contaminants and gases which may react with the weld.
www.daytonamig.com /faq.htm   (868 words)

  
 [No title]
Argon is used primarily for its properties as an inert gas in applications such as arc welding, steelmaking, heat treating and electronics manufacturing.
Although not an inert, carbon dioxide is nonreactive with many materials and is often used for inerting purposes, such as blanketing and purging of tanks and reactors.
Helium is widely used as an inert gas in the arc welding process.
www.airgas.com /products.asp?9002002000000   (1107 words)

  
 Helium - Electronic, Research and other specialty grades. Properties, Purity and Packaging, Helium - He - Helium is a ...
Ramsay obtained a sample of the uranium-bearing mineral cleveite, and upon investigating the gas produced by heating the sample, he found that a unique bright-yellow line in its spectrum matched that of the D3 line observed in the spectrum of the Sun; the new element of helium was thus conclusively identified.
Unlike argon gas, helium does not accumulate in large quantities in the atmosphere because Earth's gravity is not sufficient to prevent its gradual escape into space.
Helium gas (98.2 percent pure) is isolated from natural gas by liquefying the other components at low temperatures and under high pressures.
www.c-f-c.com /specgas_products/helium.htm   (696 words)

  
 Blue M 146 Series Inert Gas Oven   (Site not responding. Last check: 2007-10-08)
The Blue M Mechanical Convection Inert Gas Oven, which we pressure-test at normal operating levels, is ideal for applications that involve processing materials in a controlled atmosphere environment, as well as dry packaging of electronic components.
Exclusive Blue M inert gas controls purge timer to assure full chamber inerting, pressure gauge and pressure relief valve, adjustable flowmeter and purge bypass valve.
Exclusive Blue M gas delivery system where gas is introduced at the blower shaft that ensures proper mixing and eliminates the possibility of air being drawn into the chamber.
www.gruenberg.com /blue-m/146-inert.asp   (277 words)

  
 Argon - {Ar} Properties, Purity and Packaging - Argon is one of the most abundant members of the rare gas family which ...
Colourless, odourless, and tasteless, argon gas was isolated (1894) from air by the British scientists Lord Rayleigh and Sir William Ramsay.
The heavier gas remaining after both oxygen and nitrogen had been removed from air was the first of the noble gases to be discovered on Earth and was named argon because of its chemical inertness.
Argon gas condenses to a colourless liquid at -185.8° C (-302.4° F) and to a crystalline solid at -189.4° C (-308.9° F).
www.c-f-c.com /specgas_products/argon.htm   (616 words)

  
 Inert Gas Generators
Inert Gas Generator produces Inert Gas by combustion of liquid fuel / Gaseous fuel depending on product quality required.  Air along with fuel at a predetermined ratio is premixed and combustion takes place in combustion chamber.
Gas Analysis indicated is typical and can be altered to suit customer requirement.
Inert Gas is produced as soon as combustion starts.
www.singhaniasystem.com /index_files/inertgasgenerators.htm   (95 words)

  
 Harris Calorific, Inc. - V-Series   (Site not responding. Last check: 2007-10-08)
The gas surge is created by excess pressure trapped in the supply hose between the pressure control system and the valve or solenoid.
Inert Gas Guard regulators lower the excess pressure on the supply hose and reduce the surge or gas waste when the gas system is activated.
Inert Gas Guard Regulators can be set to deliver the precise amount of flow for the operation, eliminating this needless waste of shielding gas.
www.harriscal.com /2003/IGGY.asp   (171 words)

  
 ROCO Lewis Theory: Octet
Lewis postulated that inert gas atoms are chemically inert because they hold 8 valence electrons.
Decide whether the atoms in these formulas have inert gas electron configurations (note: a given formula might contain a mix of atoms with and without proper configurations, therefore you need to check every atom).
[1] Since most inert gases are chemically inert and their outer electrons are almost completely unaffected by neighboring atoms, one might argue that inert gases lack valence electrons.
academic.reed.edu /chemistry/roco/Lewis/theory_octet.html   (411 words)

  
 Job knowledge for welders 6: Tungsten inert gas (TIG or GTA) welding
Using an inert gas shield instead of a slag to protect the weldpool, the process was a highly attractive replacement for gas and manual metal arc welding.
In the TIG process the arc is formed between a pointed tungsten electrode and the workpiece in an inert atmosphere of argon or helium.
It should be noted that because of the large amount of heat generated at the electrode, it is difficult to maintain a pointed tip and the end of the electrode assumes a spherical or 'ball' profile.
www.twi.co.uk /j32k/protected/band_3/jk6.html   (1076 words)

  
 Nitrogen/Natural Gas or Propane Mixing Panel -L&L Special Furnace Co., Inc.
This is done by an inert gas low flow switch and limiting valve for combustible gas.
The natural gas or propane is injected into the furnace through a 330 alloy sparger which is located inside the furnace.
The natural gas or propane and the inert gas can be shut off from the main electrical control panel with pushbutton control switches.
www.hotfurnace.com /pages/furnaces/mpn.htm   (975 words)

  
 THE TERNARY GAS PLASMA WELDING TORCH
The increase in performance that the Ternary Gas Plasma Welding Torch achieves is attributed to a secondary inert gas acting in conjunction with the primary inert gas to provide a substantially "stiffer" arc from the electrode of the torch than a typical single inert gas provides.
The primary inert plasma gas is directed through the body of the welding torch and out of the body across the tip of a welding electrode disposed at the forward end of the body.
The secondary plasma gas may be any of the inert gases or semi-reactive gases or a mixture of two or more of these, however the choice is dependent on the material being welded and the results desired.
techtran.msfc.nasa.gov /Patents/(44).html   (493 words)

  
 Plasma Spheres / Lightning Globes
I would guess that a typical gas pressure may be around 1/10 or 1/20 of an atmosphere.
If neon is mixed with another gas (other than helium), the streamer color and character is often dominated by the other gas, but the ends of the streamer are orange or pink "pads".
Most 120 volt 40 watt bulbs have a gas fill unless the filament is very long, as in tubular refrigerator bulbs.
members.misty.com /don/plaspher.html   (1357 words)

  
 Inert your rebreather oxygen sensors   (Site not responding. Last check: 2007-10-08)
Since a sensor is really a fuel-cell, or battery, they can have their lives increased by reducing the amount of 02 that they see, thus reducing the amount of anode and cathodic material that is used over time.
The best way to prolong their lives is to store them in inert gas.
Now all I need to do is to blow it for a few seconds with a regulator hooked up to a BC inflator hose and an inert gas source.
www.nobubblediving.com /inerting.htm   (591 words)

  
 Inert Gases FAQ
The inert gas "beam" is emitted from the now upward facing end, in a cone, with about a 20 degrees solid angle.
It has been observed that when an inert gas combination is stimulated with a magnet while someone sleeps near it, that sometimes that person is quite sensitive to the effect and has trouble sleeping, or wakes up feeling poorly rested ("grouchy").
This is because the emitted inert gas energy exits from all the conductive surfaces, including the copper foil.
hilarion.com /igdfaq.html   (4914 words)

  
 Inert Gas Systems by Fike Corporation
Inert gas systems are the safe, natural way to extinguish a fire.
The PROINERT Inert Gas System has a superior valve outlet that automatically reduces the pressure at discharge, and the system provides a constant flow rate.
Most inert gas systems discharge from the nozzle into the protected space with a high surge flow rate, creating a potentially hazardous pressure peak.
www.fike.com /proinert_products.html   (290 words)

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