Argon (Ar)
Characteristics:
- makes up 1% of the atmosphere
- can be interchanged with helium in many uses.
- Does not react with the white-hot tungsten
- used in “neon signs”.
- No color, odor & taste
- Non-flammable
USES:
- Used as a shielding gas (from oxygen) in the welding of metals such as aluminum and stainless steel
- Used in refining exotic metals such as zirconium, titanium, and many alloys
- Mixed with hydrogen for cutting operations and for coating metals with refractory materials
- Used extensively in the incandescent lamp industry for the filling of light bulbs
- In doping semi-conductors
- As gaseous cooling medium in nuclear reactors
- To provide a protective atmosphere for growing germanium and silicon crystals for transistors
- To provide protective atmosphere in the production of such reactive metals as titanium and zirconium
- To fill cold weather fluorescent lamps
- To trace leaks in refrigeration and other closed system
- Medical application with oxygen
- Used in production of stainless steel by “argon-oxygen decarburizing” process which requires large quantities of argon
PROCESS DESCRIPTION
Argon is the by-product in the manufacturing of liquid oxygen and nitrogen. The process is either fractionation or distillation.
GAS COMPOSITION
Welding Grade High Purity
Argon Above 99.98% 99.999254%
Oxygen Less than 10 vpm Less than 6 vpm
Nitrogen Less than 100 vpm Less than 30 vpm
Carbon Dioxide Less than 5 vpm Less than 5 vpm
Carbon Monoxide Less than 1 vpm Less than 1 vpm
Methane Less than 1 vpm Less than 1 vpm
Hydrogen Less than 1 vpm Less than 1 vpm
Moisture @ 15.5 oC Less than 25 vpm Less than 12 vpm
MATERIAL COMPATIBILITY
Argon (Ar) is non-corrosive and so any common metal is acceptable, provided the equipment is designed to withstand process pressure.
CYLINDER INFORMATION
Gaseous Argon -In cylinders meeting specs. 3A or 3AA
Pressurized Liquid Argon -In cylinders meeting ICC specs 4L200 or 4L
Cylinder Requalification -For gaseous services by hydrostatic retest every 5 years except ICC-4 cylinders, every 10 yrs. No period retest for types 3C, 3E & 7
Containers Sizes and Color Coding:
Type Content Color-Body Color-Collar
Standard (42 L) 5.38 m3 Black White/Gray
Note: At normal temperature, cylinder pressure ranges from 1800 psig to 2000 psig.
Type of cylinders may vary according to customer’s specification.
SAFTEY PRECAUTIONS:
- Asphyxiant in high concentrations
- Use only approved pressure rated equipment
- Never allow oil or grease on a cylinder or valve
- Cylinders should be secured from falling over
- Always close cylinder valve before disconnecting it from a hose line of manifold.
- In case of relief valve cylinder opens while being transported or set, the cylinder should be moved to a safe place and vented until the pressure is lowered.
- Always close the cylinder valve when the work is finished.
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