Unless specifically defined in the Texas Clean Air Act (Texas
Health and Safety Code, Chapter 382), or in §101.1 or §112.1
of this title (relating to Definitions, respectively), the terms in
this division have the meanings commonly used in the field of air
pollution control. The following meanings apply in this division unless
the context clearly indicates otherwise.
(1) Block one-hour average--An hourly average of data,
collected starting at the beginning of each clock hour of the day
and continuing until the start of the next clock hour of the day (e.g.,
from 12:00:00 to 12:59:59).
(2) Continuous Monitoring--Monitoring for which readings
are recorded at least once every 15 minutes.
(3) Howard County sulfur dioxide (SO2) nonattainment area--The portion of Howard County designated
by the United States Environmental Protection Agency as nonattainment
for the 2010 SO2 National Ambient Air
Quality Standard, 40 Code of Federal Regulations §81.344.
(4) Off-line--With respect to a carbon black oil furnace,
a period when either:
(A) only natural gas and combustion air are supplied
to the furnace burners (no oil is supplied to the furnace burners),
and the furnace is not manufacturing carbon black or generating tail
gas; or
(B) the oil furnace is not operating.
(5) On-line--Not "off-line," as defined in paragraph
(4) of this subsection.
(6) Production unit--The combined equipment used in
the manufacture of carbon black, including but not limited to, carbon
black oil furnaces or reactors, bag unit filters, cyclones, fans,
and carbon black dryers as specified in this rule. Production Units
1 and 2 consist of nine carbon black oil furnaces that produce tail
gas and five carbon black dryers that combust tail gas and exhaust
emissions through Dryer Stack Units Nos. 1 & 2 (Emission Point
Number (EPN) 7A). Production Unit 3 consists of four carbon black
oil furnaces that produce tail gas and two carbon black dryers that
combust tail gas and exhaust emissions through Dryer Stack Unit No.
3 (EPN 12A). A portion of the tail gas from all of the furnaces is
also combusted in the Incinerator + HRSG (EPN 13A) or by Flare 4 (EPN
Flare 4).
(7) Tail gas--The exit gaseous stream of a carbon black
oil furnace consisting of water vapor, carbon monoxide, hydrogen,
pyrolysis by-products, and reduced and organic sulfur compounds as
a result of the manufacture of carbon black.
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