Test Procedure For Oxygen Generation:
Crack the Oxygen purity test valve, open the stop-cock
'G', adjust the gas flow and allow the sample gas to bubble
through the purging vessel for one or two minutes. Check
that the burette, the reaction chamber and the test connection
tube are completely filled with water. Turn the stop-cock
open to the burette connection. Then slowly open the cock
'H' to allow the oxygen to pass into the burette (not the
reacting chamber), controlling the oxygen flow. When the
burette is filled below the bottom mark, close the stop
- cocks 'G' and 'H' and disconnect the oxygen sample tube
, close the test valve.
Adjust the level of the gas in the burette to the 100 cc
mark by holding the leveling bottle at the level of the
water in the burette and carefully opening the cocks 'G'
& "H' to bubble through the purging vessel to atmosphere.
Note For Oxygen Generation:
1. When first passed into the burette,
the Oxygen sample will be colder than the room temperature
and will expand as it warms. Therefore, the sample should
be allowed to warm to room temperature for several minutes
before the level is adjusted to the zero mark. Pass the
gas sample into the reaction chamber by turning the burette
stop cock 'H' to connect it to the reaction chamber, then
raising the leveling bottle. Close the stop cock, replace
the leveling bottle in the holder and allow the oxygen in
the sample to react with the phosphorus. The reaction results
in the emission of the white smoke consisting of phosphorus
pent oxide dissolve in water to form phosphoric acid. When
reaction is complete, as indicated by smoke ceasing to emit,
open the cock and lower the leveling bottle to pass the
unabsorbed gas from the reacting tube into the burette,
pinch the rubber tube to ensure no bubbles are trapped in
it. Level the liquid in the burette and the leveling bottle
and note the reading indicated on the burette scale at the
liquid level. This reading is equal to percentage of purity
of the original Oxygen sample.
2. The gas sample may be warm due to the
reaction of the oxygen purity with phosphorus. Allow it
cool to room temperature for several minutes before adjusting
the level to the zero marking any such contamination.
The following precautions must be strictly observed at
Generating Oxygen Plants:
1. Thoroughly wash all oxygen fittings,
valves and parts with clean Tricolor Ethylene / carbon tetra
chloride (CTC) before installation. Never use petrol, kerosene
or other hydrocarbon solvents for this purpose. All tubing,
lines valves etc. to be used in oxygen service, must be
of an approved type and must be thoroughly degreased and
blown out with clean oil-free compressed air or Nitrogen
before being placed in service.
2. Do not permit the release of Acetylene
or other flammable gases in the vicinity of the plant air
intake. A concentration of Acetylene exceeding 5 parts per
million in liquid oxygen may explode with extreme violence.
Strict super
