[Code of Federal Regulations]
[Title 40, Volume 13]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR65.85]

[Page 67-68]
 
                TITLE 40 - PROTECTION OF ENVIRONMENT
 
      CHAPTER I - ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 65 - CONSOLIDATED FEDERAL AIR RULE--Table of Contents
 
                     Subpart E - Transfer Racks
 
Sec. 65.85  Procedures.

    (a) Vapor tightness. For the purposes of demonstrating vapor 
tightness to determine compliance with Sec. 65.84(c)(2), the 
following procedures and equipment shall be used:
    (1) The pressure test procedures specified in Method 27 of appendix 
A of 40 CFR part 60; and
    (2) A pressure measurement device that has a precision of 
ñ2.5 millimeters of mercury (0.10 inch) or better and that 
is capable of measuring above the pressure at which the tank truck or 
railcar is to be tested for vapor tightness.
    (b) Engineering assessment. Engineering assessment to determine if a 
vent stream is halogenated or flow rate of a gas stream includes, but is 
not limited to, the following examples:
    (1) Previous test results, provided the tests are representative of 
current operating practices at the process unit.
    (2) Bench-scale or pilot-scale test data representative of the 
process under representative operating conditions.
    (3) Maximum flow rate or halogen emission rate specified or implied 
within a permit limit applicable to the process vent.
    (4) Design analysis based on accepted chemical engineering 
principles, measurable process parameters, or physical or chemical laws 
or properties.
    (5) All data, assumptions, and procedures used in the engineering 
assessment shall be documented.
    (c) Halogenated vent stream determination. In order to determine 
whether a vent stream is halogenated, the mass emission rate of halogen 
atoms contained in organic compounds shall be calculated as specified in 
paragraphs (c)(1) and (2) of this section.
    (1) The vent stream concentration of each organic compound 
containing halogen atoms (parts per million by volume by compound) shall 
be determined based on any of the following procedures:
    (i) Process knowledge that no halogen or hydrogen halides are 
present in the vent stream; or
    (ii) Applicable engineering assessment as specified in paragraph (b) 
of this section; or
    (iii) Concentration of organic compounds containing halogens 
measured by Method 18 of appendix A of 40 CFR part 60; or

[[Page 68]]

    (iv) Any other method or data that have been validated according to 
the applicable procedures in Method 301 of appendix A of 40 CFR part 63.
    (2) Equation 85-1 of this section shall be used to calculate the 
mass emission rate of halogen atoms:
[GRAPHIC] [TIFF OMITTED] TR14DE00.004

Where:

E = Mass of halogen atoms, dry basis, kilograms per hour.
K2 = Constant, 2.494 x 10-6 (parts per 
million)-1 (kilogram-mole per standard cubic meter) (minute/
hour), where standard temperature is 20 C.
Vs = Flow rate of gas stream, dry standard cubic meters per 
minute, determined according to Method 2, 2A, 2C, or 2D of appendix A of 
40 CFR part 60, as appropriate, or determined using engineering 
assessment as specified in paragraph (b) of this section.
n = Number of halogenated compounds j in the gas stream.
j = Halogenated compound j in the gas stream.
m = Number of different halogens i in each compound j of the gas stream.
i = Halogen atom i in compound j of the gas stream.
Cj = Concentration of halogenated compound j in the gas 
stream, dry basis, parts per million by volume.
Lji = Number of atoms of halogen i in compound j of the gas 
stream.
Mji = Molecular weight of halogen atom i in compound j of the 
gas stream, kilogram per kilogram-mole.