MVE LN2 Tx, Руководство оператора, Страница: 5 / 9

PN 15098830 Rev A — 5
HANDLING OF
LIQUID OXYGEN
GENERAL
Liquid Oxygen (O2) is created by liquefaction in the operation of
the MVE LN2 TX. Because the liquid temperature of Nitrogen
is colder than that of Oxygen, Oxygen in the atmosphere will
condense on the exposed cold surfaces of the LN2 TX during a
transfer.
Although not flammable or explosive by itself, it is an oxidizer
that will accelerate combustion of flammable materials and allow
some materials that are not normally flammable to burn.
All of the cold exposure issues discussed above in the section on
handling liquid nitrogen also apply to liquid oxygen. There are
additional safety considerations to keep in mind in the handling
of O2. These additional considerations are associated with the
oxidizer properties of liquid oxygen.
• DO NOT SMOKE NEAR THE TRANSFER DEVICE
• KEEP OPEN FLAMES AWAY FROM THE TRANSFER
DEVICE
• KEEP FLAMMABLE MATERIALS AWAY FROM THE
TRANSFER DEVICE
• DO NOT USE THE LN2 TX TO TRANSFER LIQUID
OXYGEN.
PROPERTIES
Oxygen is a colorless, odorless, tasteless gas. Gaseous Oxygen
makes up about 21% of the Earth’s atmosphere. Once collected
and isolated, Oxygen will liquefy when cooled properly. The prop-
erties of O2 are as follows:
PROPERTY VALUE
Boiling Point @ 1 ATM, in °C ...........................-183
Thermal Conductivity (Gas), w/m2 °K ............0.0142
Latent Heat of Vaporization, Btu/Liter ............230
Liquid Density, lb/liter @ 1 ATM .....................2.517
Expansion Ratio @ STP .....................................860:1
Warning
Oxygen
No smoking
No fire
WARNINGS