TM 5-4220-227-14
WARNING
To prevent the spread of disease, serious injury and/or death, oxygen breathing systems must be
maintained hygienically clean and free from dust, dirt, and all hydrocarbon contamination. Refer to
oxygen system prework procedures para. 4-10 to avoid violating this warning.
4-9.
Oxygen Supply. Remove plastic pipe plug from the High Pressure Oxygen Supply fitting on the right hand side of
chamber console. Retain plug for sealing system when not in service. Connection is female 1/2-inch, National Pipe
Thread (N.P.T.). Care should be exercised to not contaminate the oxygen system with oil or other hydrocarbons.
4-10. Oxygen System Prework Checks.
Prior to start of work on any component of the oxygen breathing system ensure that:
a.
The external surface of the component parts of the oxygen system and the adjacent area are free from dust, dirt,
and all hydrocarbon contamination.
b.
The tools used to work on O2 systems are maintained hygienically clean and free from dust, dirt, and all
hydrocarbon contamination Do not lend or use these tools for any other purpose.
c.
The oxygen system is open and exposed to any possible contamination for as little time as possible.
d.
The component replacement parts have been maintained hygienically clean and free from dust, dirt, and all
hydrocarbon contamination.
e.
An adequate supply of clean plastic bags and bag ties approved for this purpose are readily available.
f.
All personnel involved in the maintenance of these O2 breathing systems are properly trained in maintaining O2
clean conditions.
During work on any component of the oxygen breathing system ensure that:
a.
Plastic bags, pipe (tubing) caps and/or plugs are NOT removed from any component UNTIL immediately ready
to install that particular component or ready to make that particular connection. (See step c. above.)
b.
All pipe (tubing) caps and/or plugs are retained sealed in plastic bags for future use Do not reuse plastic bags.
c.
Care is taken not to bend or crimp tubing. Damaged tubing must be repaired or replaced
d.
Teflon thread sealing tape is used on external threads to prevent leaks and ensure tight connection.
e.
Components and tubing connections are properly aligned before connection is made to prevent cross-threading.
Start nuts on threads several turns by hand before using wrench.
4-5
