MOJAQMD RULE 916 STD. FOR STEEL PLANTS: ELEC. ARC FURNACES

LAST REVISED 12/03/76

(Adopted: December 3, 1976)

Rule 916

Standards of Performance for

Steel Plants: Electric Arc Furnaces



(a) Definitions

(1) ELECTRIC ARC FURNACE (EAF) means any furnace that

produces molten steel and heats the charge materials

with electric arcs from carbon electrodes. Furnaces

from which the molten steel is cast into the shape of

finished products, such as in a foundry, are not

affected facilities included within the scope of this

definition. Furnaces which, as the primary source of

iron, continuously feed pre-reduced ore pellets are not

affected facilities within the scope of this

definition.

(2) DUST-HANDLING EQUIPMENT means any equipment used to

handle particulate matter collected by the control

device and located at or near the control device for an

EAF subject to this sub-part.

(3) CONTROL DEVICE means the air pollution control

equipment used to remove particulate matter generated

by the EAF(s) from the effluent gas stream.

(4) CAPTURE SYSTEM means the equipment (including ducts,

hoods, fans, dampers, etc.) used to capture or

transport particulate matter generated by an EAF to the

air pollution control device.

(5) CHARGE means the addition or iron and steel scrap or

other materials into the top of an electric arc

furnace.

(6) CHARGING PERIOD means the time period commencing at the

moment an EAF starts to open and ending either three

minutes after the EAF roof is returned to its closed

position or six minutes after commencement of opening

of the roof, whichever is longer.

(7) TAPPING PERIOD means the time period commencing at the

moment an EAF begins to tilt to pour and ending either

three minutes after an EAF returns to an upright

position or six minutes after commencing to tilt,

whichever is longer.

(8) MELTDOWN AND REFINING means the phase of the steel

production cycle when charge material is melted and

undesirable elements are removed from the metal.

(9) 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.

(10) SHOP OPACITY means the arithmetic average of 24 or more

opacity observations of emissions from the shop taken

in accordance with the method specified in Rule 902

(C)(2) for the applicable time periods.

(11) HEAT TIME means the period commencing when scrap is

charged to an empty EAF and terminating when the EAF

tap is completed.

(12) SHOP means the building which houses one or more EAF's.

(13) DIRECT SHELL EVACUATION SYSTEM means any system that

maintains a negative pressure within the EAF above the

slag or metal and ducts these emissions to the control

device.

(14) TAP means the pouring of molten steel from an EAF.

(b) Emission Standard

This rule applies to the following affected facilities in

steel plants: electric arc furnaces and dust handling

equipment, the construction, modification or reconstruction

of which commenced after October 21, 1974.

(1) On and after the date on which the performance test

required to be conducted by Rule 902 (b)(1) is

completed, no owner or operator subject to the

provisions of this rule shall cause to be discharged

into the atmosphere from an electric arc furnace any

gases which:

(A) Exit from a control device and contain particulate

matter in excess of 12 milligrams per dry standard

cubic meter (0.0052 grains per dry standard cubic

foot);

(B) Exit from a control device and exhibit three

percent opacity or greater; and

(C) Exit from a shop and, due solely to operations of

any EAF(s), exhibit greater than zero percent shop

opacity except:

(i) shop opacity greater than zero percent but

less than 20 percent may occur during

charging periods;

(ii) shop opacity greater than zero percent but

less than 40 percent may occur during tapping

periods;

(iii)where the capture system is operating such

that the roof of the shop is closed during

the charge and the tap, and emissions to the

atmosphere are prevented until the roof is

opened after completion of the charge or tap,

the shop opacity standards under paragraph

(1)(C) of this section shall apply when the

roof is opened and shall continue to apply

for the length of time defined by the

charging and/or tapping periods.

(2) On and after the date on which the performance test

required to be conducted by Rule 902 (b)(1) is

completed, no owner or operator subject to the

provisions of this rule shall cause to be discharged

into the atmosphere from dust-handling equipment any

gases which exhibit ten percent opacity or greater.

(c) Monitoring Emissions

A continuous monitoring system for the measurement of the

opacity of emissions discharged into the atmosphere from the

control device(s) shall be installed, calibrated,

maintained, and operated by the owner or operator subject to

the provisions of this rule.

For the purpose of reports under Rule 902(a)(4) periods of

excess emissions that shall be reported are defined as all

six minute periods during which the average opacity is three

percent or greater.

(d) Monitoring Operations

(1) The owner or operator subject to the provisions of this

rule shall maintain records daily of the following

information:

(A) time and duration of each charge

(B) time and duration of each tap

(C) all flow rate data obtained under paragraph (2) of

this section

(D) all pressure data obtained under paragraph (5) of

this section.

(2) Except as provided under paragraph (4) of this section,

the owner or operator subject to the provisions of this

subpart shall install, calibrate, and maintain a

monitoring device that continuously records the

volumetric flow rate through each separately ducted

hood. The monitoring device(s) may be installed in any

appropriate location in the exhaust duct such that

reproducible flow rate monitoring will result. The

flow rate monitoring device(s) shall have an accuracy

of +or- 10 percent over its normal operating range and

shall be calibrated according to the manufacturer's

instructions. The Air Pollution Control Officer may

require the owner or operator to demonstrate the

accuracy of the monitoring device(s) relative to Rule

902(b).

(3) When the owner or operator of an EAF is required to

demonstrate compliance with the standard under

paragraph (b)(1)(C) of the Emission Standard section

and at any other time the Air Pollution Control Officer

may require, the volumetric flow rate through each

separately ducted hood shall be determined during all

periods in which the hood is operated for the purpose

of capturing emission from the EAF using the monitoring

device under paragraph (2) of this section. The owner

or operator may petition the Air Pollution Control

Officer for reestablishment of these flow rates

whenever the owner or operator can demonstrate to the

Air Pollution Control Officer's satisfaction that the

EAF operating conditions upon which the flow rates were

previously established are no longer applicable. The

flow rates determined during the most recent

demonstration of compliance shall be maintained (or may

be exceeded) at the appropriate level for each

applicable period. Operation at lower flow rates may

be considered by the Air Pollution Control Officer to

be unacceptable operation and maintenance of the

affected facility.

(4) The owner or operator may petition the Air Pollution

Control Officer to approve any alternative method that

will provide a continuous record of operation of each

emission capture system.

(5) Where emissions during any phase of the heat time are

controlled by use of a direct shall evacuation system,

the owner or operator shall install calibrate, and

maintain a monitoring device that continuously records

the pressure in the free space inside the EAF. The

pressure shall be recorded as 15-minute integrated

averages. The monitoring device may be installed in

any appropriate location in the EAF such that

reproducible results will be obtained. The pressure

monitoring device shall have an accuracy of 5 mm of

water gauge over its normal operating range and shall

be calibrated according to the manufacturer's

instructions.

(6) When the owner or operator of an EAF is required to

demonstrate compliance with the standard under

paragraph (b)(1)(C) of the Emission Standard section

and at any other time the Air Pollution Control Officer

may require, the pressure in the free space inside the

furnace shall be determined during the meltdown and

refining period(s) using the monitoring device under

paragraph (5) of this section. The owner or operator

may petition the Air Pollution Control Officer for

reestablishment of the 15-minute integrated average

pressure whenever the owner or operator can demonstrate

to the Air Pollution Control Officer's satisfaction

that the EAF operating conditions upon which the

pressures were previously established are no longer

applicable. The pressure determined during the most

recent demonstration of compliance shall be maintained

at all times the EAF is operating in a meltdown and

refining period. Operation at higher pressures may be

considered by the Air Pollution Control Officer to be

unacceptable operation and maintenance of the affected

facility.

(7) Where the capture system is designed and operated such

that all emissions captured are ducted to a control

device, the owner or operator shall not be subject to

the requirements of this section.

(8) Monitoring instruments and sampling systems installed

and used pursuant to this section shall be subject to

the requirements and performance specifications in 40

CFR 60.13 and 40 CFR 60 Appendix B.

(e) Testing Procedure

Emissions shall be tested according to the methods specified

by the Air Pollution Control Officer.