نسیم صبح فردا

What is Helium?

  • Helium is a monoatomic molecule. Helium is the lightest element after hydrogen and has the smallest molecular cross section among gases.
  • It is one of the rare gases in the atmosphere. It is completely neutral in chemical reactions. The thermal conductivity of helium over other rare gases makes helium superior to other rare gases.
  • Helium is non-flammable and only slightly soluble in water

Available grades:

%99.9999 -%99.9995 -%99.999 -%99.998


Tanks and maintenance:

  • Helium gas can be transported and stored in cylinders – tanks and trailer tubes in accordance with the DOT standard and TC rules.
  • Liquid helium transported as cryogenic fluid in insulated (cryogenic) cylinders and cryogenic tanks

Compatible and incompatible materials:

  • Helium gas is a neutral and non-corrosive , Also its compatible with all common metals.
  • In the presence of liquid helium, carbon steels and many alloys lose their conductivity.
  • Liquid metals compatible with helium include :
    stainless steel 8-18, austenitized nickel-chromium alloys, copper, Monel, brass and aluminum.
Molecular Weight 4.00
steam pressure 100 K. Pa @ -268.94 0C
Gas density 0.0165 Kg/m3 @ 21.1 0C and 1 atm
Latent heat of vaporization at the boiling point 20.28 KJ/Kg
Special heat capacity CP=5.19 KJ/Kg.0C

CV=3.121 KJ/Kg.0C

CP/CV=1.66

Critical Temperature -268.90C
Critical Pressure 227 KPa(a)
Ability to dissolve in water 0.0094 vol.(gas)/Vol.(Water) at 00C and 1 atm
Explosion / ignition range in air  Non-Flammable Gas

Material Compatibility of Helium

 

METALS PLASTICS ELASTOMERS

Brass

CARBON STEEL

StainLess Steel

Alumium

Zinc

CoPPER

Monel

Kel-F

Teflon

Tefzel

Kynar

PVC

Polycarbonate

Viton® Buna-N Neoprene Polyurethane

O

Kalrez

GAS

 

S – Satisfactory for use with the intended gas
C – Conditional. May be incompatible under some circumstances or conditions Contact your Praxair representative for additional information
U – Unsatisfactory for use with the intended gas
I – Insufficient data available to determine compatibility with the intended gas
O – All nonmetalic, even those considered compatible, may be ignitable in oxygen enriched environments or in other oxidizing gases. Successful
use depends upon oxygen purity, pressure, temperature, cleanliness and elimination of ignition mechanisms. Please contact your Praxair
Representative for additional information

Classification of dangerous Products:

Dangerous Products Transport Information:

 

IATA IMDG DOT
UN 1046
UN 1046 UN 1046 UN NUMBER
Helium, compressed Helium, compressed Helium, compressed UN SHIPPING NAME
2.2 2.2 2.2 TRANSPORT HAZARD CLASS
NO NO NO ENVIRONMENTAL HAZARD
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