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EPA Method 21文档
1151
METHOD 21 - DETERMINATION OF VOLATILE
ORGANIC COMPOUND LEAKS
1.0 Scope and Application.
1.1 Analytes.
Analyte CAS No.
Volatile Organic Compounds No CAS number assigned
(VOC)
1.2 Scope. This method is applicable for the
determination of VOC leaks from process equipment. These
sources include, but are not limited to, valves, flanges and
other connections, pumps and compressors, pressure relief
devices, process drains, open-ended valves, pump and
compressor seal system degassing vents, accumulator vessel
vents, agitator seals, and access door seals.
1.3 Data Quality Objectives. Adherence to the
requirements of this method will enhance the quality of the
data obtained from air pollutant sampling methods.
2.0 Summary of Method.
2.1 A portable instrument is used to detect VOC leaks
from individual sources. The instrument detector type is
not specified, but it must meet the specifications and
performance criteria contained in Section 6.0. A leak
definition concentration based on a reference compound is
specified in each applicable regulation. This method is
intended to locate and classify leaks only, and is not to be
1152
used as a direct measure of mass emission rate from
individual sources.
3.0 Definitions.
3.1 Calibration gas means the VOC compound used to
adjust the instrument meter reading to a known value. The
calibration gas is usually the reference compound at a known
concentration approximately equal to the leak definition
concentration.
3.2 Calibration precision means the degree of
agreement between measurements of the same known value,
expressed as the relative percentage of the average
difference between the meter readings and the know
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