- Oxy-Fuel Gas Processes
A fuel gas is a gas that burns in air or oxygen. With few exceptions, fuel gases consist of one or more hydrocarbons. The fuel gases used for flame processes are generally acetylene, mixed gases with methylacetylene-propadiene, ethylene, propylene, hydrogen, propane and natural gas.
These gases have varying physical properties and are stored differently as liquefied gas, compressed gas or dissolved under pressure. With respect to safety aspects, the explosion limits and density of the gases and the risk for backfire should be considered.
In principle, all fuel gases are safe if handled correctly. It is therefore vital that the user study the suppliers' instructions carefully and find out which laws and codes apply to the particular fuel gas in the particular country.
Working with fuel-gases and oxygen can be risky if the person using the equipment does not have sufficient knowledge of the equipment and its installation, handling and care.
- Products & Supply
- Bulk Industrial Gases
- Carbon Dioxide
- Cylinder Industrial Gases
- Dry Ice
- Electronic Gases and Chemicals
- Emergency Delivery
- Environmental & VOC Standards
- Excimer Laser Gases
- Food Freezing
- Food Grade Gases
- Fuel Gases
- Food Chilling
- Gas Mixtures
- Ion Propulsion
- Lighting Gases
- Liquefied Natural Gas
- Packaged Chemicals
- Specialty Equipment
- Specialty Gases
- Supply Modes
- Water Treatment
- Window Gases
- Pharmaceutical Solutions
- Welding and Safety Products
Individual gases typically are available as industrial grade. Many mixtures of these gases are also available and often standard mixtures are supplied for specific processing results. Industrial, by definition, is acceptable for wide ranging applications - from welding to food packaging. The most common form of delivery is in low or high pressure cylinders.
All gas cylinders supplied by Linde are labeled in accordance with federal regulations, and valved in accordance with the American National Standards Institute Standard B-57.1 and CGA V-1 Publication for Valve Connections.
Flame Process Gases
Food Preserving Atmospheres
- Modified Atmosphere Packaging
Linde supplies Modified Atmosphere Packaging (MAP) gases for use in food preservation and packaging. MAP is a method for extending product shelf life, preserving the high quality of foodstuffs, and improving overall cost-effectiveness. Our MAPAX® family of gas mixtures can do all of this for the food packaging company.
The gases used most often are carbon dioxide (CO2), nitrogen (N2) and oxygen (O2). The gas or gas mixture used depends greatly on the foodstuffs involved along with ambient and packaging parameters. Gases can be supplied either premixed in cylinders under high pressure or as separate gases for subsequent mixing in the packaging machine.
- Helium & Helium/Hydrogen Mixtures
Helium filled balloons add color, enjoyment, amusement and entertainment to parties and other festive events. This gas is available at our retail store outlets along with inflator connections.
Helium/hydrogen mixtures are also supplied for outdoor display and weather balloons.
Laser Gases for Welding & Cutting
- Composition of Laser Gases
Gas lasers need laser gases in order to generate the laser beam. The laser gas mixture required to run a CO2 laser contains 60-85% helium, 13-55% nitrogen and 1-9% carbon dioxide. The exact composition varies depending on the type of laser and the manufacturer. Some laser types also require small additions of other gases such as oxygen, hydrogen or xenon. The TEA laser gas mixture, on the other hand, often contains a small percentage of CO. CO is toxic and aggressive, requiring additional safety devices in the gas supply system.
The laser gas needed for an Excimer laser consists of 0.05-0.3% halogen (fluorine or hydrogen chloride), 1-10% rare gas (krypton, xenon or argon) and 90-99% buffer gas (helium or neon). For safety reasons, the halogen is always diluted with helium or neon.
- Purity of Laser Gases
Today, laser manufacturers demand relatively high-purity laser gases. Impurities in the laser gas impede the laser performance by lowering the output power, disturbing the uniformity of the electrical discharge and requiring frequent service and maintenance for the laser optics. The most harmful impurities have been identified as water vapor and hydrocarbons.
Impurities in the laser gas, however, come not only from the gas cylinders themselves but can also be introduced via a poorly designed and set-up gas distribution system. Selection of appropriate components for the gas supply system and expert installation are therefore crucial for reliable and satisfactory laser operations.
- Delivery of Laser Gases
- Most of the CO2 laser gases are delivered in separate gas cylinders and mixed within the laser. Sometimes, the CO2 laser gases and most of the TEA laser gases are ordered premixed. The Excimer laser gases are supplied in separate cylinders for industrial applications. For medical Excimer lasers, on the other hand, the laser gases are most often supplied premixed in a single cylinder.
Shielding Gases for Welding
- About Shielding Gases for Welding
The potential of a welding process can only be fully utilized if the shielding gas is properly suited for the job. Our knowledge of how this tool works is our active contribution to obtaining the best overall value for your welding process.
The welding process can be influenced in a number of ways with the aid of shielding gases. It can be optimized for material, thickness, welding position, and many other factors. The gas or gas mixture must be selected according to the required effects on the welding process.
- Physical and Chemical Properties Make a Big Difference
- Physical gas properties affect metal transfer, wetting behavior, depth of penetration, shape of penetration, travel speed, and arc starting. For example, gases with low ionization energy (e.g. Argon) facilitate arc starting and arc stabilization. Gases with a high dissociation energy (e.g. CO2) enhance the heat input to the base material. Thermal conductivity of the shielding gas influences weld geometry, weld-pool temperature, and travel speeds. Chemical properties influence both the metallurgical behavior and the weld surface quality.
- The Right Shielding Gas for Every Welding Process
- Linde features both MISON® and ARCLINE™ brands of shielding gases for GMAW, GTAW, and PAW.
- The MISON Family of Shielding Gases
The MISON family of welding shielding gases. The right mixture for each application. MISON is not just one gas, but a range. Each mixture in that range has been developed for a specific type of welding applications or group of applications to bring you the very best. So whatever your base metal, filler metal or method, you can select from the MISON range to optimize the welding result - higher deposition rates, improved weld characteristics and the right weld quality and appearance.
MISON shielding gases contain a small concentration of nitric oxide which reacts with ozone generated around the weld, reducing it at its source. Production usage has realized several other benefits:
Superior arc starts
Increase welding speed
Seeing is believing. Contact your local Linde gas representative for an on-site demonstration. Once you have seen it, you'll believe in the MISON line of shielding gases.
Thermal Spray Gases
- About Thermal Spraying
- Thermal spraying has become increasingly important, both in the manufacturing of new parts and in the repair of existing parts. Thermal spraying covers a wide range of spray coating processes. They are classified according to the type of spray material, type of operation and type of energy source. It is essential to use the correct gas(es) for the energy source being utilized.
- Why Use Thermal Spray?
:: Any material can be a coating
:: Coatings are not thermally altered
:: Parts of any size, any geometry can be coated
:: Can / should be automated
:: Highly reproducible
:: Dimensionally accurate
- About Distribution Methods
- Many times you need a small amount of gas in a specific place within your facility. Or you need to take gases with you such as for repairs or maintenance. Most gases can be pressurized into cylinders to meet these types of requirements. Special containers are also available to hold liquified gases for cryogenic use. We have specially designed delivery trucks for all of these vessels and our rigid maintenance checks make sure that breakdowns don't cause late deliveries.
- Cylinders come in many sizes and use different materials of construction depending on the gas and purity requirements. The internal gas pressure varies by type and rating of the cylinder. In order to safely draw product from a cylinder a regulator is required. This is threaded into the open/close valve in the top of the cylinder and is then used to set a reduced pressure for flow as required. Typically, cylinder capacities range from 10 to 350 cubic feet (CF) of gas product.
- Cylinder Banks
- Banks are either 6 or 12 gas cylinders of the same size and product. The cylinders share a common manifold so that one regulator and line can be used to draw from all of the cylinders. Banks may be skid mounted or come on wheels. Product capacity is in the range of 3000 to 4000 CF of product.
- Dewars, Liquid Cans
- Dewars, liquid cans or LGs have a footprint roughly the size of a 55-gallon drum, but are taller. They contain liquid gas which can be drawn from the container as either a liquid or as a gas. Capacity varies by product from 3,000 to 5,000 CF.
- Pallet Tanks
- These are small cryogenic tanks built into a self-contained, palletized system. They can be used for oxygen, nitrogen, argon and carbon dioxide. Tare weights are roughly 1300 lbs with product capacities ranging from 8,300 to 13,000 CF depending on the gas.