3.2.13.2
Test Gas Purity, Contaminate Levels, and Test Methods
Table 4 lists limits of contaminants or concentration minimums in the test
gases used for purging and testing in oxygen, nitrogen, and nitrous oxide
systems, and test methods to be used to determine levels of contaminants
and concentration minimums.
TABLE 4
TEST GAS PURITY, CONTAMINATE LEVELS,
AND TEST METHODS
a. Test Gas:
99 percent by volume minimum; gas chromatography or
equivalent.
b. Solid Particulate:
2 milligrams per cubic meter maximum; 0.8 micron
pore size filter.
c. Hydrocarbon Compounds: One part per million, concentration volume per
volume, maximum expressed as methane equivalents; gas chromatography or
equivalent.
d. Halogenated Hydrocarbon Compounds: 2 parts per million, concentration
volume per volume, maximum; mass spectrometry, infrared spectrometry, or gas
chromatography.
e. Carbon Monoxide: 2 parts per million, concentration volume per
volume, maximum; gas chromatography, electrochemical carbon monoxide
analyzer, or equivalent.
f. Water (Moisture): Minus 50 degrees C 58 degrees F dew point;
Pittsburg cup, dew point hygrometer, or electronic hygrometer.
3.2.13.3
Medical Air Purity, Contaminate Levels, and Test Methods
Determine medical air purity and contaminate levels by testing air quality
at the compressor, but before air is allowed to enter piping system. Test
air samples from each medical air system including air intake areas,
filter/dryer equipment outlets, and specified system outlets. Limit solid
particulate levels below the specified filter efficiency levels. Limit
moisture levels below that of the specified dryer outlet dew point. Use
test methods specified in paragraph entitled "Test Gas Purity, Contaminate
Levels, and Test Methods."
3.2.13.4
Contamination Tests
Test gas sources, equipment outlets, and system outlets using test methods
specified in paragraphs entitled "Test Gas Purity, Contaminate Levels, and
Test Methods," and entitled "Medical Air Purity, Contaminate Levels, and
Test Methods."
3.2.13.5
Gas Source Tests
Test gas and air sources for contamination and gas concentrations.Purge
oxygen, medical gas, nitrous oxide, and nitrogen systems with an
appropriate gas until gases reach specified concentrations, clean and free
of contamination. Care must be taken to vent purged nitrous oxide and
oxygen to the outside of the building and away from flames.
SECTION 15217N
Page 33
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