8: Do not fill any container or pipe line
with oxygen unless it has been thoroughly degreased with
clean CTC or TCE.
9: When discharging liquid oxygen or rich liquid
from drains, valves or pipe lines, open valves slowly to
avoid the possibility of being splashed. In particular ensure
that liquid does not run into shoes or gloves. Contact with
liquid oxygen rich liquid will cause frostbite evidenced
by whiteness and numbness of the skin. The affected parts
must be batched at once in cold (not box) water and seek
medical attention immediately.
10: . Do not breathe cold oxygen vapor. The temperature
of the vapor rising from liquid oxygen is approximately
- 181 Deg C. A deep breath of vapor at this temperature
can result in frost-bitten lungs with resultant serious
illness and permanent
disability or death.
11: Do not experiment with liquid oxygen
by putting solids or liquids into it for the
purpose of watching the effect of the cold liquid. The object
placed in the oxygen may catch fire or explode.
12: Do not pour liquid oxygen on the floor
of the shop or around any object that can catch fire. As
the liquid oxygen vaporizes, the cold vapors may be swept
along ground into contact _ith combustible material. The
whole floor of an office is known to have caught fire when
oxygen vapors contacted a lighted cigarette butt. Spillage
of liquid oxygen must be avoided especially in the vicinity
of lubricated machinery, asphalt paving, concrete surface
containing bitumen joints or where the liquid oxygen can
flow into drains or sewers.
13: Do not use any pipe jointing on oxygen
pipe threads except approved for oxygen service. Ordinary
pipe jointing contains grease as a lubricant and will catch
fire.
14: Compressor and Expander lubricating
oil consumption must be regularly checked any excessive
consumption must be investigated immediately and the cause
rectified.
15: occur or if liquid level is unaccountably
lost in the plant, and if any check indicates oxygen concentration
above 21%, immediate action should be taken to locate and
rectify.
16: The use of a flame ( e.g. for welding
or cutting) in the immediate vicinity of the Air Separation
Plant or oxygen piping must be permitted only when the plant
has been shut down and de frosted and when the oxygen content
of the air within the equipment concerned does not exceed
the atmospheric normal of 21%. Do not attempt repair until
all pressure is released from the section to be dismantled.
17: Remember that pressure alone is not
dangerous. A Boiler at 0.7 Kg/cm2g may be more destructive
in the event of an explosion than a small container at 220
kegs/cm2 owing to the greater mass of metal involved. In
general, fluid at high pressure and moving at a high velocity
are the most dangerous. Use a face shield or chemical type
safety goggles when using the oxygen or nitrogen test set
to prevent possible injury to the operator in the event
of a blow-back of the reagent.
