PIPER SENECA II SERVICE MANUAL
01/01/09 XIV - ACCESSORIES AND UTILITIES
3C21
14-77. OXYGEN SYSTEM COMPONENTS
Keeping in mind the effect of compressed oxygen on materials, oxygen system components must be
handled carefully. Ports on regulators, indicators, and other opened components must also be kept
capped or plugged to prevent ingestion of foreign material. Adjustments or modifications should only be
initiated under the auspices of the FAA, Piper, or Scott Aviation.
14-78. CLEANING AND PURGING
CA
UTION: CARE MUST BE EXERCISED TO PREVENT CONTAMINATION OF COMPONENTS
BY OIL, GREASE, WATER, OR FOREIGN MATTER. COMPRESSED AIR USED IN
CLEANING AND FLUSHING TUBES MUST BE CLEAN, DRY, FILTERED (OIL
FREE) AIR ONLY.
Three methods are recommended for cleaning oxygen system components:
1. Method I.
a. Vapor degrease part(s) with trichlorethylene.
b. Blow part(s) dry with a stream of compressed air or dry nitrogen. Refer to previous caution.
2. Method II.
a. For tubing, flush with naptha per specification TT-N-95.
b. Blow clean and dry off all solvent with clean, dry, filtered air. Refer to previous caution.
c. Flush with isopropyl alcohol.
d. Rinse thoroughly with fresh water.
e. Dry with air as described in previous caution or by heating at a temperature of 250° to 300°F
for one-half hour.
NO
TE: Solvents can be reused provided they do not become badly contaminated with oil.
This condition can be determined by thoroughly evaporating 100 millimeters of the
liquid in a glass dish of a determined weight. Evaporation may be accomplished by
heating the dish at 200°F (93°C) for one-half hour. If, after evaporation and cool
down, the residue exceeds 100 milligrams in weight, the solvent cannot be used for
this purpose.
3. Method III.
a. Flush with hot inhibited alkaline cleaner until free from oil and grease.
b. Rinse thoroughly with fresh water.
c. Dry thoroughly with a stream of clean air as described in the previous caution or by heating
250°F to 300°F (121°C to 149°C) for one-half hour minimum.
CA
UTION: DO NOT USE ADHESIVE TAPE FOR ATTACHING OR SECURING
PROTECTIVE COVERINGS ON OXYGEN COMPONENTS. USE WAXED
LACING TWINE OR TIE RAPS.
d. After cleaning, all tubing must be protected by caps, plugs and/or plastic bags.
e. Before installation, make sure fitting, tube, and fixture threads are in good condition and that
the cones do not exhibit pitting or disfigurement.
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