Current through Register Vol. 39, No. 6, September 16, 2024
(a)
For the purpose of this Rule, the following definitions apply:
(1) "Capture hoods" means any device designed
to remove emissions from the solution bath tray areas during the manufacturing
process.
(2) "Curing" means
exposing coated threads to high temperatures in an oven until the nylon
solution mixture hardens, vaporizing the solvents, and bonds to the
threads.
(3) "Day tanks" means
holding tanks that contain nylon solution mixture ready for use.
(4) "Drying ovens" means any apparatus
through which the coated threads are conveyed while curing.
(5) "Enclose" means to construct an area
within the plant that has a separate ventilation system and is maintained at a
slightly negative pressure.
(6)
"Fugitive emissions" means emissions that cannot be collected and routed to a
control system.
(7) "Nylon thread
coating process" means a process in which threads are coated with a nylon
solution and oven cured.
(8)
"Permanent label" means a label that cannot be easily removed or defaced by any
person.
(9) "Polyester solution
mixture" means a mixture of polyester and solvents that is used for thread
coating.
(10) "Storing" means
reserving material supply for future use.
(11) "Thread bonding manufacturing" means
coating single or multi-strand threads with plastic (nylon or polyester
solution mixture) to impart properties such as additional strength and
durability, water resistance, and moth repellency.
(12) "Transporting" means moving material
supply from one place to another.
(b) This Rule shall apply to any thread
bonding manufacturing facility with total uncontrolled exhaust emissions from
nylon thread coating process collection hoods and drying ovens of volatile
organic compounds (VOC) equal to or greater than 100 tons per year.
(c) Annual VOC emissions from each nylon
thread coating process shall be determined by multiplying the hourly amount of
VOC consumed by the total scheduled operating hours per year.
(d) Emissions from each nylon thread coating
process subject to this Rule shall be reduced:
(1) by at least 95 percent by weight;
or
(2) by installing a thermal
incinerator with a temperature of at least 1600°F and a residence time of
at least 0.75 seconds.
(e) The owner or operator of any thread
bonding manufacturing facility shall:
(1)
enclose the nylon thread coating process area of the plant to prevent fugitive
emissions from entering other plant areas;
(2) store all VOC-containing materials in
covered tanks or containers;
(3)
ensure that equipment used for transporting or storing VOC containing material
does not leak and that all lids and seals used by the equipment are kept in the
closed position at all times except when in actual use;
(4) not cause or allow VOC-containing
material to be splashed, spilled, or discarded in sewers;
(5) hold only enough nylon solution mixture
in the day tanks to accommodate daily process times measured in hours;
and
(6) place permanent and
conspicuous labels on all equipment affected by Subparagraphs (3) through (5)
of this Paragraph summarizing handling procedures described in these
Subparagraphs for VOC-contaminated materials at the nylon thread coating
process.
(f) The owner
or operator of a thread bonding manufacturing facility shall notify the
Director within 30 days after the calculated annual emissions of VOC from nylon
thread coating processes equal or exceed 100 tons per year. The owner or
operator shall submit within six months after such calculation a permit
application including a schedule to bring the facility into compliance with
this Rule.
Authority
G.S.
143-215.3(a)(1);
143-215.107(a);
Eff. May 1, 1995;
Readopted Eff. November 1,
2020.
