Indiana Administrative Code
Title 326 - AIR POLLUTION CONTROL DIVISION
Article 8 - VOLATILE ORGANIC COMPOUND RULES
Rule 19 - Control of Volatile Organic Compound Emissions from Process Vents in Batch Operations
Section 19-4 - Determination of uncontrolled total annual mass emissions and actual weighted average flow rate values for a batch process train or unit operation
Universal Citation: 326 IN Admin Code 19-4
Current through March 20, 2024
Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11
Affected: IC 13-15; IC 13-17
Sec. 4.
(a) Uncontrolled total annual mass emissions shall be determined by the following methods:
(1) Direct process vent emissions
measurements taken prior to any release to the atmosphere, following any
recovery device, prior to mixing with vents from other process trains or
unrelated operations, and prior to any control device, provided the
measurements conform with the requirements of measuring the mass flow rate of
VOC incoming to the control device as set forth in section 5(f)(2),
5(f)(3)(A)(i), and 5(f)(3)(A)(ii) of this rule.
(2) Engineering estimates of the uncontrolled
VOC emissions from a process vent or process vents, in the aggregate, within a
batch process train, using either the potential or permitted number of batch
cycles per year or total production as represented in the permit for the batch
process train as follows:
(A) Engineering
estimates of the uncontrolled VOC emissions shall be based upon accepted
chemical engineering principles, measurable process parameters, or physical or
chemical laws and their properties. Examples of methods include, but are not
limited to, the following:
(i) Use of material
balances based on process stoichiometry to estimate maximum VOC
concentrations.
(ii) Estimation of
maximum flow rate based on physical equipment design, such as pump or blower
capacities.
(iii) Estimation of VOC
concentrations based on saturation conditions.
(B) All data, assumptions, and procedures
used in any engineering estimate shall be documented.
(b) Average flow rate shall be determined by any of the following methods:
(1) Direct process vent flow rate
measurements taken prior to any release to the atmosphere, following any
recovery device, prior to mixing with vents from other process trains or
unrelated operations, and prior to any control device, provided the
measurements conform with the requirements of measuring incoming volumetric
flow rate set forth in section 5(f)(2) of this rule.
(2) Average flow rate for a unit operation
having multiple emission events or batch process trains shall be the weighted
average flow rate, calculated as follows:
Where: WAF = actual weighted average flow rate for a unit operation or batch process train.
AFRi = average flow rate of emission event i.
ADEi = annual duration of emission event i.
i = subscript denoting a specific emission event.
n = number of emission events.
(3) Engineering estimates calculated in
accordance with the requirements in subsection (a)(2).
(c) For purposes of determining the average flow rate for steam vacuuming systems, the steam flow shall be included in the average flow rate calculation.
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