[Title 40 CFR 60.271a]
[Code of Federal Regulations (annual edition) - July 1, 2009 Edition]
[Title 40 - PROTECTION OF ENVIRONMENT]
[Chapter I - ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)]
[Subchapter C - AIR PROGRAMS (CONTINUED)]
[Part 60 - STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES--]
[Subpart Aaa - Standards of Performance for Steel Plants: Electric Arc]
[Sec. 60.271a - Definitions.]
[From the U.S. Government Printing Office]


40PROTECTION OF ENVIRONMENT62009-07-012009-07-01false60.271aSec. 60.271aPROTECTION OF ENVIRONMENTENVIRONMENTAL PROTECTION AGENCY (CONTINUED)AIR PROGRAMS (CONTINUED)STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES--Standards of Performance for Steel Plants: Electric Arc
Sec. 60.271a  Definitions.

    As used in this subpart, all terms not defined herein shall have the 
meaning given them in the Act and in subpart A of this part.
    Argon-oxygen decarburization vessel (AOD vessel) means any closed-
bottom, refractory-lined converter vessel with submerged tuyeres through 
which gaseous mixtures containing argon and oxygen or nitrogen may be 
blown into molten steel for further refining.
    Bag leak detection system means a system that is capable of 
continuously monitoring relative particulate matter (dust) loadings in 
the exhaust of a baghouse to detect bag leaks and other conditions that 
result in increases in particulate loadings. A bag leak detection system 
includes, but is not limited to, an instrument that operates on 
triboelectric, electrodynamic, light scattering, light transmittance, or 
other effect to continuously monitor relative particulate matter 
loadings.
    Capture system means the equipment (including ducts, hoods, fans, 
dampers, etc.) used to capture or transport particulate matter generated 
by an electric arc furnace or AOD vessel to the air pollution control 
device.
    Charge means the addition of iron and steel scrap or other materials 
into the top of an electric arc furnace or the addition of molten steel 
or other materials into the top of an AOD vessel.
    Control device means the air pollution control equipment used to 
remove particulate matter from the effluent gas stream generated by an 
electric arc furnace or AOD vessel.
    Direct-shell evacuation control system (DEC system) means a system 
that

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maintains a negative pressure within the electric arc furnace above the 
slag or metal and ducts emissions to the control device.
    Dust-handling system means equipment used to handle particulate 
matter collected by the control device for an electric arc furnace or 
AOD vessel subject to this subpart. For the purposes of this subpart, 
the dust-handling system shall consist of the control device dust 
hoppers, the dust-conveying equipment, any central dust storage 
equipment, the dust-treating equipment (e.g., pug mill, pelletizer), 
dust transfer equipment (from storage to truck), and any secondary 
control devices used with the dust transfer equipment.
    Electric arc furnace (EAF) means a furnace that produces molten 
steel and heats the charge materials with electric arcs from carbon 
electrodes. For the purposes of this subpart, an EAF shall consist of 
the furnace shell and roof and the transformer. Furnaces that 
continuously feed direct-reduced iron ore pellets as the primary source 
of iron are not affected facilities within the scope of this definition.
    Heat cycle means the period beginning when scrap is charged to an 
empty EAF and ending when the EAF tap is completed or beginning when 
molten steel is charged to an empty AOD vessel and ending when the AOD 
vessel tap is completed.
    Meltdown and refining period means the time period commencing at the 
termination of the initial charging period and ending at the initiation 
of the tapping period, excluding any intermediate charging periods and 
times when power to the EAF is off.
    Melting means that phase of steel production cycle during which the 
iron and steel scrap is heated to the molten state.
    Negative-pressure fabric filter means a fabric filter with the fans 
on the downstream side of the filter bags.
    Positive-pressure fabric filter means a fabric filter with the fans 
on the upstream side of the filter bags.
    Refining means that phase of the steel production cycle during which 
undesirable elements are removed from the molten steel and alloys are 
added to reach the final metal chemistry.
    Shop means the building which houses one or more EAF's or AOD 
vessels.
    Shop opacity means the arithmetic average of 24 observations of the 
opacity of emissions from the shop taken in accordance with Method 9 of 
appendix A of this part.
    Tap means the pouring of molten steel from an EAF or AOD vessel.
    Tapping period means the time period commencing at the moment an EAF 
begins to pour molten steel and ending either three minutes after steel 
ceases to flow from an EAF, or six minutes after steel begins to flow, 
whichever is longer.

[49 FR 43845, Oct. 31, 1984, as amended at 64 FR 10110, Mar. 2, 1999; 70 
FR 8532, Feb. 22, 2005]