نسیم صبح فردا

What is hydrogen?

  • Hydrogen is a colorless, odorless, tasteless, non-toxic and flammable gas.

  • This element is present in the form of gas at ambient temperature and atmospheric pressure.

  • This gas is known as the lightest gas and with a density of approximately %0.07 of air with an invisible flame of hydrogen in the presence of air with a blue flame is very faint and in many cases burns with an invisible flame.


Available hydrogen grades:

%99.9999 -%99.999 – %99.99 – %99.5


Tanks and maintenance:

  • Hydrogen gas is portable in cylinders, trailer tubes and pressure vessels.

  • Liquid hydrogen can be stored and transported at room temperature in multi-crusted cryogenic tanks for liquid hydrogen.


Compatible and incompatible materials:

  • Non-corrosive hydrogen gas at pure temperature can be in contact with ordinary metals.

  • Ordinary carbon steels lose their conductivity at the temperature of liquid hydrogen and become very brittle.


Suitable for standing to liquid hydrogen:

  • Austenitized nickel chromium (stainless steel), copper, copper-silicon alloy, aluminum, monel, and some brass and bronze alloys are suitable for exposure to liquid hydrogen.

 

Molecular Weight 2.016
steam pressure 100 K. Pa @ -253.13 0C
Gas density 0.08342 Kg/m3 @ 21.1 0C and 1 atm
Latent heat of vaporization at the boiling point 446 KJ/Kg
Special heat capacity CP=14.34 KJ/Kg.0C

CV=10.12 KJ/Kg.0C

CP/CV=1.42

Special heat capacity -239.960C
Critical pressure 1316 KPa(a)
Solubility in water 0.019 vol.(gas)/Vol.(Water) at 15.60C and 1 atm
Explosion / ignition range in air  Flammable Gas

Material Compatibility of Hydrogen

 

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 goods:

Dangerous Goods Transport Information:

 

IATA IMDG DOT
UN 1049 UN 1049 UN 1049 UN NUMBER
Hydrogen, compressed Hydrogen, compressed Hydrogen, compressed UN SHIPPING NAME
2.1 2.1 2.1 TRANSPORT HAZARD CLASS
NO NO NO ENVIRONMENTAL HAZARD
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