Terms used in this subpart are defined in the CAA, in Sec. 63.2, and in this section as follows:
Aqueous liquid means a liquid mixture in which water is the predominant component.
Brine means an aqueous solution of alkali metal chloride, as sodium chloride salt solution or potassium chloride salt solution, that is used in the electrolyzer as a raw material.
By-product hydrogen stream means the hydrogen gas from each decomposer that passes through the hydrogen system and is burned as fuel, transferred to another process as raw material, or discharged directly to the atmosphere.
Caustic means an aqueous solution of alkali metal hydroxide, as sodium hydroxide or potassium hydroxide, that is produced in the decomposer.
Caustic basket means a fixture adjacent to the decomposer that contains a serrated funnel over which the caustic from the decomposer passes, breaking into droplets such that electric current is interrupted.
Caustic system means all vessels, piping, and equipment that convey caustic and remove mercury from the caustic stream. The caustic system begins at the decomposer and ends after the primary filters.
Cell room means a building or other structure in which one or more mercury cells are located.
Continuous parameter monitoring system, or CPMS, means the total equipment that may be required to meet the data acquisition and availability requirements of this subpart, used to sample, condition (if applicable), analyze, and provide a record of process of control system parameters.
Control device means a piece of equipment (such as condensers, coolers, chillers, heat exchangers, mist eliminators, absorption units, and adsorption units) that removes mercury from gaseous streams.
Decomposer means the component of a mercury cell in which mercury amalgam and water react in bed of graphite packing (within a cylindrical vessel), producing caustic and hydrogen gas and returning mercury to its elemental form for re-use in the process.
Deviation means any instance in which an affected source subject to this subpart, or an owner or operator of such a source:
(1) Fails to meet any requirement or obligation established by this subpart including, but not limited to, any emission limitation (including any operating limit) or work practice standard;
(2) Fails to meet any term or condition that is adopted to implement an applicable requirement in this subpart and that is included in the title V operating permit for any affected source required to obtain such a permit;
(3) Fails to meet any emission limitation (including any operating limit) or work practice standard in this subpart during startup, shutdown, or malfunction, regardless of whether or not such failure is allowed by this subpart; or
(4) Fails to take corrective actions within 48 hours that result in parameter monitoring values being within range.
Electrolyzer means the main component of the mercury cell that consists of an elongated, shallow steel trough that holds a layer of mercury as a flowing cathode. The electrolyzer is enclosed by side panels and a top that suspends metal anodes. In the electrolyzer, brine is fed between a flowing mercury cathode and metal anodes in the presence of electricity to produce chlorine gas and an alkali metal-mercury amalgam (mercury amalgam).
Emission limitation means any emission limit or operating limit.
End box means a component of a mercury cell for transferring materials between the electrolyzer and the decomposer. The inlet end box collects and combines raw materials at the inlet end of the cell, and the outlet end box separates and directs various materials either into the decomposer or out of the cell.
End box ventilation system means all vessels, piping, and equipment that evacuate the head space of each mercury cell end box (and possibly other vessels and equipment) to the atmosphere. The end box ventilation system begins at the end box (and other vessel or equipment which is being evacuated) and terminates at the end box ventilation system vent. The end box ventilation system includes all control devices.
End box ventilation system vent means the discharge point of the end box ventilation system to the atmosphere after all control devices.
Hydrogen leak means hydrogen gas (containing mercury vapor) that is escaping from the decomposer or hydrogen system.
Hydrogen system means all vessels, piping, and equipment that convey a by-product hydrogen stream. The hydrogen system begins at the decomposer and ends at the point just downstream of the last control device. The hydrogen system includes all control devices.
In liquid mercury service means containing or coming in contact with liquid mercury.
Liquid mercury accumulation means one or more liquid mercury droplets, or a pool of liquid mercury, present on the floor or other surface exposed to the atmosphere.
Liquid mercury leak means the liquid mercury that is dripping or otherwise escaping from process equipment.
Liquid mercury spill means a liquid mercury accumulation resulting from a liquid mercury that leaked from process equipment or that dripped during maintenance or handling.
Mercury cell means a device consisting of an electrolyzer and decomposer, with one or more end boxes, a mercury pump, and other components linking the electrolyzer and decomposer.
Mercury cell amalgam seal pot means a compartment through which mercury amalgam passes from an outlet end box to a decomposer.
Mercury cell chlor-alkali plant means all contiguous or adjoining property that is under common control, where mercury cells are used to manufacture product chlorine, product caustic, and by-product hydrogen and where mercury may be recovered from wastes.
Mercury cell chlor-alkali production facility means an affected source consisting of all cell rooms and ancillary operations used in the manufacture of product chlorine, product caustic, and by-product hydrogen at a mercury cell chlor-alkali plant.
Mercury concentration CMS, or mercury concentration continuous monitoring system, means a CMS, as defined in Sec. 63.2, that continuously measures the concentration of mercury.
Mercury-containing wastes means waste materials containing mercury, which are typically classified under Resource Conservation and Recovery Act (RCRA) solid waste designations. K071 wastes are sludges from the brine system. K106 are wastewater treatment sludges. D009 wastes are non-specific mercury-containing wastes, further classified as either debris or nondebris (i.e., cell room sludges and carbon from decomposes).
Mercury pump means a component of a mercury cell for conveying elemental mercury re-created in the decomposer to the beginning of the mercury cell. A mercury pump is typically found either as an in-line mercury pump (near a mercury suction pot or mercury seal pot) or submerged mercury pump (within a mercury pump tank or mercury pump seal).
Mercury recovery facility means an affected source consisting of all processes and associated operations needed for mercury recovery from wastes at a mercury cell chlor-alkali plant.
Mercury thermal recovery unit means the retort(s) where mercury-containing wastes are heated to volatilize mercury and the mercury recovery/control system (control devices and other equipment) where the retort off-gas is cooled, causing mercury to condense and liquid mercury to be recovered.
Mercury thermal recovery unit vent means the discharge point of the mercury thermal recovery unit to the atmosphere after all recovery/control devices. This term encompasses both oven type vents and non-oven type vents.
Mercury vacuum cleaner means a cleanup device used to draw a liquid mercury spill or accumulation (via suction pressure) into a closed compartment.
Non-oven type mercury thermal recovery unit vent means the discharge point to the atmosphere after all recovery/control devices of a mercury thermal recovery unit in which the retort is either a rotary kiln or single hearth retort.
Open-top container means any container that does not have a tight-fitting cover that keeps its contents from being exposed to the atmosphere.
Oven type mercury thermal recovery unit vent means the discharge point to the atmosphere after all recovery/control devices of a mercury thermal recovery unit in which each retort is a batch oven retort.
Responsible official means responsible official as defined in 40 CFR 70.2.
Retort means a furnace where mercury-containing wastes are heated to drive mercury into the gas phase. The types of retorts used as part of mercury thermal recovery units at mercury cell chlor-alkali plants include batch oven retorts, rotary kilns, and single hearth retorts.
Spalling means fragmentation by chipping.
Sump means a large reservoir or pit for wastewaters (primarily washdown waters).
Trench means a narrow channel or depression built into the length of a cell room floor that leads washdown materials to a drain.
Vent hose means a connection for transporting gases from the mercury cell.
Virgin mercury means mercury that has not been processed in an onsite mercury thermal recovery unit or otherwise recovered from mercury-containing wastes onsite.
Washdown means the act of rinsing a floor or surface with a stream of aqueous liquid to cleanse it of a liquid mercury spill or accumulation, generally by driving it into a trench.
Week means any consecutive seven-day period.
Work practice standard means any design, equipment, work practice, or operational standard, or combination thereof, that is promulgated pursuant to section 112(h) of the CAA.
Sec. Table 1 to Subpart IIIII of Part 63--Work Practice Standards--
Design, Operation, and Maintenance Requirements
As stated in Sec. 63.8192, you must meet the work practice standards in the following table: ------------------------------------------------------------------------
For . . . You must . . .------------------------------------------------------------------------1. Cell rooms..................... a. For new or modified cell rooms,
construct each cell room interior
using materials that are resistant
to absorption of mercury, resistant
to corrosion, facilitate the
detection of liquid mercury spills
or accumulations, and are easy to
clean.
b. Limit access around and beneath
mercury cells in each cell room to
prevent liquid mercury from being
tracked into other areas.
c. Provide adequate lighting in each
cell room to facilitate the
detection of liquid mercury spills
or accumulations.
d. Minimize the number of items
stored around and beneath cells in
each cell room.2. Mercury cells and electrolyzers a. Operate and maintain each
electrolyzer, decomposer, end box,
and mercury pump to minimize
leakage of mercury.
b. Prior to opening an electrolyzer
for maintenance, do the following:
(1) Complete work that can be done
before opening the electrolyzer in
order to minimize the time required
to complete maintenance when the
electrolyzer is open; (2) fill the
electrolyzer with an aqueous
liquid, when possible; (3) allow
the electrolyzer to cool before
opening; and (4) schedule and staff
maintenance of the electrolyzer to
minimize the time the electrolyzer
is open.
c. When the electrolyzer top is
raised and before moving the top
and anodes, thoroughly flush all
visible mercury from the top and
the anodes with an aqueous liquid,
when possible.
d. While an electrolyzer is open,
keep the bottom covered with an
aqueous liquid or maintain a
continuous flow of aqueous liquid,
when possible.
e. During an electrolyzer side panel
change, take measures to ensure an
aqueous liquid covers or flows over
the bottom, when possible.
f. Each time an electrolyzer is
opened, inspect and replace
components, as appropriate.
g. If you step into an electrolyzer
bottom, either remove all visible
mercury from your footwear or
replace them immediately after
stepping out of the electrolyzer.
h. If an electrolyzer is
disassembled for overhaul
maintenance or for any other
reason, chemically clean the bed
plate or thoroughly flush it with
an aqueous liquid.
i. Before transporting each
electrolyzer part to another work
area, remove all visible mercury
from the part or contain the part
to prevent mercury from dripping
during transport.
j. After completing maintenance on
an electrolyzer, check any mercury
piping flanges that were opened for
liquid mercury leaks.
k. If a liquid mercury spill occurs
during any maintenance activity on
an electrolyzer, clean it up in
accordance with the requirements in
Table 3 to this subpart.3. Vessels in liquid mercury If you replace a vessel containing
service. mercury that is intended to trap
and collect mercury after December
19, 2003, replace it with a vessel
that has a cone shaped bottom with
a drain valve or other design that
readily facilitates mercury
collection.4. Piping and process lines in a. To prevent mercury buildup after
liquid mercury service. December 19, 2003, equip each new
process line and piping system with
smooth interiors and adequate low
point drains or mercury knock-out
pots to avoid liquid mercury
buildup within the pipe and to
facilitate mercury collection and
recovery.5. Cell room floors............... a. Maintain a coating on cell room
floors that is resistant to
absorption of mercury and that
facilitates the detection of liquid
mercury spills or accumulations.
b. Maintain cell room floors such
that they are smooth and free of
cracking and spalling.
c. Maintain the cell room floor to
prevent mercury accumulation in the
corners.
d. Maintain a layer of aqueous
liquid on liquid mercury contained
in trenches or drains and replenish
the aqueous layer at least once per
day.
e. Keep the cell room floor clean
and free of debris.
f. If you step into a liquid mercury
spill or accumulation, either
remove all visible mercury from
your footwear or replace your
footwear immediately.6. End boxes...................... a. Either equip each end box with a
fixed cover that is leak tight, or
route the end box head space to an
end box ventilation system.
b. For each end box ventilation
system: maintain a flow of aqueous
liquid over the liquid mercury in
the end box and maintain the
temperature of the aqueous liquid
below its boiling point, maintain a
negative pressure in the end box
ventilation system, and maintain
the end box ventilation system in
good condition.
c. Maintain each end box cover in
good condition and keep the end box
closed when the cell is in service
and when liquid mercury is flowing
down the cell, except when
operation or maintenance activities
require short-term access.
d. Keep all bolts and C-clamps used
to hold the covers in place when
the cell is in service and when
liquid mercury is flowing down the
cell.
e. Maintain each access port stopper
in an end box cover in good sealing
condition and keep each end box
access port closed when the cell is
in service and when liquid mercury
is flowing down the cell.7. Decomposers.................... a. Maintain each decomposer cover in
good condition and keep each
decomposer closed and sealed,
except when maintenance activities
require the cover to be removed.
b. Maintain connections between the
decomposer and the corresponding
cell components, hydrogen system
piping, and caustic system piping
in good condition and keep the
connections closed/tight, except
when maintenance activities require
opening/loosening these
connections.
c. Keep each mercury cell amalgam
seal pot closed and sealed, except
when operation or maintenance
activities require short-term
access.
d. Prior to opening a decomposer, do
the following: fill the decomposer
with an aqueous liquid or drain the
decomposer liquid mercury into a
container that meets requirements
in Table 1, Item 9 or 10, allow the
decomposer to cool before opening,
and complete work that can be done
before opening the decomposer.
e. Take precautions to avoid mercury
spills when changing graphite grids
or balls in horizontal decomposers
or graphite packing in vertical
decomposers. If a spill occurs, you
must clean it up in accordance with
the requirements in Table 3 to this
subpart.
f. After each maintenance activity,
use an appropriate technique (Table
6 to this subpart) to check for
hydrogen leaks.
g. Before transporting any internal
part from the decomposer (such as
the graphite basket) to another
work area, remove all visible
mercury from the part or contain
the part to prevent mercury from
dripping during transport.
h. Store carbon from decomposers in
accordance with the requirements in
40 CFR part 265, subparts I and CC,
until the carbon is treated or is
disposed.8. Submerged mercury pumps........ a. Provide a vapor outlet connection
from each submerged pump to an end
box ventilation system. The
connection must be maintained under
negative pressure.
b. Keep each mercury pump tank
closed, except when maintenance or
operation activities require the
cover to be removed.
c. Maintain a flow of aqueous liquid
over the liquid mercury in each
mercury pump tank and maintain the
aqueous liquid at a temperature
below its boiling point.9. Open-top containers holding Maintain a layer of aqueous liquid
liquid mercury. over liquid mercury in each open-
top container. Replenish the
aqueous layer at least once per day
and, when necessitated by operating
procedures or observation, collect
the liquid mercury from the
container in accordance with the
requirements in Table 4 to this
subpart.10. Closed containers used to a. Store liquid mercury in
store liquid mercury. containers with tight fitting
covers.
b. Maintain the seals on the covers
in good condition.
c. Keep each container securely
closed when mercury is not being
added to, or removed from, the
container.11. Caustic systems............... a. Maintain the seal between each
caustic basket cover and caustic
basket by using gaskets and other
appropriate material.
b. Do not allow solids and liquids
collected from back-flushing
primary caustic filters to contact
floors or run into open trenches.
c. Collect solids and liquids from
back-flushing each primary caustic
filter and collect these mercury-
containing wastes in process
vessels or in accordance with the
requirements in 40 CFR part 265,
subparts I and CC.
d. Keep each caustic basket closed
and sealed, except when operation
or maintenance activities require
short term access.12. Hydrogen systems.............. a. Collect drips from each hydrogen
seal pot and compressor seal in
containers meeting the requirements
in this table for open containers.
These drips should not be allowed
to run on the floor or in open
trenches.
b. Minimize purging of hydrogen from
a decomposer into the cell room by
either sweeping the decomposer with
an inert gas or by routing the
hydrogen to the hydrogen system.
c. Maintain hydrogen piping gaskets
in good condition.
d. After any maintenance activities,
use an appropriate technique (Table
6 to this subpart) to check all
hydrogen piping flanges that were
opened for hydrogen leaks.------------------------------------------------------------------------
Sec. Table 2 to Subpart IIIII of Part 63--Work Practice Standards--
Required Inspections
As stated in Sec. 63.8192, you must meet the work practice standards in the following table: ----------------------------------------------------------------------------------------------------------------
At least once each . . .
You must inspect . . . And if you find . . . You must . . .----------------------------------------------------------------------------------------------------------------1. Each vent hose on each mercury Half day................ A leaking vent hose.... Take action immediately
cell. to correct the leak.2. Each open-top container holding Half day................ Liquid mercury that is Take action immediately
liquid mercury. not covered by an to cover the liquid
aqueous liquid. mercury with an
aqueous liquid.3. Each end box..................... Half day................ a. An end box cover not Take action immediately
securely in place. to put the end box
cover securely in
place.
b. An end box stopper Take action immediately
not securely in place. to put the end box
stopper securely in
place.
c. Liquid mercury in an Take action immediately
end box that is not to cover the liquid
covered by an aqueous mercury with an
liquid at a aqueous liquid.
temperature below
boiling.4. Each mercury amalgam seal pot.... Half day................ A seal pot cover that Take action immediately
is not securely in to put the seal pot
place. cover securely in
place.
5. Each mercury seal pot............ Half day................ A mercury seal pot Take action immediately
stopper not securely to put the mercury
in place. seal pot stopper
securely in place.6. Cell room floors................. Month................... Cracks, spalling, or Repair the crack,
other deficiencies spalling, or other
that could cause deficiency within 1
liquid mercury to month from the time
become trapped. you identify the
deficiency.7. Pillars and beams................ 6 months................ Cracks, spalling, or Repair the crack,
other deficiencies spalling, or other
that could cause deficiency within 1
liquid mercury to month from the time
become trapped. you identify the
deficiency.8. Each caustic basket.............. Half day................ A caustic basket cover Take action immediately
that is not securely to put the caustic
in place. basket cover securely
in place.9. All equipment and piping in the Day..................... Equipment that is Initiate repair of the
caustic system. leaking caustic. leaking equipment
within 72 hours from
the time that you
identify the caustic
leak.10. All floors and other surfaces Half day................ A liquid mercury spill Take the required
where liquid mercury could or accumulation. action specified in
accumulate in cell rooms and other Table 3 to this
production facilities and in subpart.
mercury recovery facilities.11. Each electrolyzer bottom, Day..................... Equipment that is Take the required
electrolyzer side panel, end box, leaking liquid mercury. action specified in
mercury amalgam seal pot, Table 3 to this
decomposer, mercury pump, and subpart.
hydrogen cooler, and all other
vessels, piping, and equipment in
liquid mercury service in the cell
room.12. Each decomposer and all hydrogen Half day................ Equipment that is Take the required
piping up to the hydrogen header. leaking hydrogen and/ action specified in
or mercury vapor. Table 3 to this
subpart.13. All equipment in the hydrogen 3 months................ Equipment that is Take the required
system from the start of the header leaking hydrogen and/ action specified in
to the last control device. or mercury vapor. Table 3 to this
subpart.----------------------------------------------------------------------------------------------------------------
Sec. Table 3 to Subpart IIIII of Part 63--Work Practice Standards--
Required Actions for Liquid Mercury Spills and Accumulations and
Hydrogen and Mercury Vapor Leaks
As stated in Sec. 63.8192, you must meet the work practice standards in the following table: ------------------------------------------------------------------------During a required inspection or at
any other time, If you find . . . You must . . .
------------------------------------------------------------------------1. A liquid mercury spill or a. Initiate clean up of the liquid
accumulation. mercury spill or accumulation as
soon as possible, but no later than
1 hour from the time you detect it.
b. Clean up liquid mercury using a
mercury vacuum cleaner or by using
an alternative method. If you use
an alternative method to clean up
liquid mercury, you must submit a
description of the method to the
Administrator in your Notification
of Compliance Status report.
c. If you use a mercury vacuum
cleaner, the vacuum cleaner must be
designed to prevent generation of
airborne mercury; you must cap the
ends of hoses after each use; and
after vacuuming, you must wash down
the area.
d. Inspect all equipment in liquid
mercury service in the surrounding
area to identify the source of the
liquid mercury within 1 hour from
the time you detect the liquid
mercury spill or accumulation.
e. If you identify leaking equipment
as the source of the spill or
accumulation, contain the dripping
mercury, stop the leak, and repair
the leaking equipment as specified
below.
f. If you cannot identify the source
of the liquid mercury spill or
accumulation, re-inspect the area
within 6 hours of the time you
detected the liquid mercury spill
or accumulation, or within 6 hours
of the last inspection of the area.2. Equipment that is leaking a. Contain the liquid mercury
liquid mercury. dripping from the leaking equipment
by placing a container under the
leak within 30 minutes from the
time you identify the liquid
mercury leak.
b. The container must meet the
requirement for open-top containers
in Table 1 to this subpart.
c. Make a first attempt at stopping
the leak within 1 hour from the
time you identify the liquid
mercury leak.
d. Stop the leak and repair the
leaking equipment within 4 hours
from the time you identify the
liquid mercury leak.
e. You can delay repair of equipment
leaking liquid mercury if you
either isolate the leaking
equipment from the process so that
it does not remain in mercury
service; or determine that you
cannot repair the leaking equipment
without taking the cell off line,
provided that you contain the
dripping mercury at all times as
described above, and take the cell
off line as soon as practicable,
but no later than 48 hours from the
time you identify the leaking
equipment. You cannot place the
cell back into service until the
leaking equipment is repaired.3. A decomposer or hydrogen system a. Make a first attempt at stopping
piping up to the hydrogen header the leak within 1 hour from the
that is leaking hydrogen and/or time you identify the hydrogen and/
mercury vapor. or mercury vapor leak.
b. Stop the leak and repair the
leaking equipment within 4 hours
from the time you identify the
hydrogen and/or mercury vapor leak.
c. You can delay repair of an
equipment leaking hydrogen and/or
mercury vapor if you isolate the
leaking equipment or take the cell
off line until you repair the
leaking equipment.4. Equipment in the hydrogen a. Make a first attempt at stopping
system, from the start of the the leak within 4 hours from the
hydrogen header to the last time you identify the hydrogen and/
control device, that is leaking or mercury vapor leak.
hydrogen and/or mercury vapor.
b. Stop the leak and repair the
header within 24 hours from the
time you identify the hydrogen and/
or mercury vapor leak.
c. You can delay repair of equipment
leaking hydrogen and/or mercury
vapor if you isolate the leaking
equipment.------------------------------------------------------------------------
Sec. Table 4 to Subpart IIIII of Part 63--Work Practice Standards--
Requirements for Mercury Liquid Collection
As stated in Sec. 63.8192, you must meet the work practice standards in the following table: ----------------------------------------------------------------------------------------------------------------
----------------------------------------------------------------------------------------------------------------You must collect liquid mercury At the following When collecting the mercury, you must meet these
from . . . intervals requirements----------------------------------------------------------------------------------------------------------------1. Open-top containers.......... a. At least once i. If you spill ii. From the time iii. Within 4
each 72 hours. liquid mercury that you collect hours from the
during collection liquid mercury time you collect
or transport, you into a temporary the liquid
must take the container until mercury, you must
action specified the time that you transfer it from
in Table 3 to store the liquid each temporary
this subpart for mercury, you must container to a
liquid mercury keep it covered storage container
spills and by an aqueous that meets the
accumulations. liquid. specifications in
Table 1 to this
subpart.2. Vessels, low point drains, a. At least once See 1.a.i through
mercury knock-out pots, and each week. iii above.
other closed mercury collection
points.
3. All other equipment.......... a. Whenever See 1.a.i. through
maintenance iii above.
activities
require the
opening of the
equipment.----------------------------------------------------------------------------------------------------------------
Sec. Table 5 to Subpart IIIII of Part 63--Required Elements of Floor-
Level Mercury Vapor Measurement and Cell Room Monitoring Plans
Your Floor-Level Mercury Vapor Measurement Plan required by Sec. 63.8192(d) and Cell Room Monitoring Plan required by Sec. 63.8192(g) must contain the elements listed in the following table: ------------------------------------------------------------------------
You must specify in your plan . .
. Additional requirements------------------------------------------------------------------------
Floor-Level Mercury Vapor Measurement Plan------------------------------------------------------------------------1. Locations in the cell room The locations must be representative
where you will measure the level of the entire cell room floor area.
of mercury vapor. At a minimum you must measure the
level of mercury vapor above
mercury-containing cell room
equipment, as well as areas around
the cells, decomposes, or other
mercury-containing equipment.2. Equipment or sampling and If an instrument or other equipment
analytical methods that you will is used, the plan must include
use to measure the level of manufacturer specifications and
mercury vapor. calibration procedures. The plan
must also include a description of
how you will ensure that the
instrument will be calibrated and
maintained according to
manufacturer specifications.3. Measurement frequency.......... Measurements must take place at
least once each half day.4. Number of measurements......... At least three readings must be
taken at each sample location and
the average of these readings must
be recorded.5. A floor-level mercury The action level may not be higher
concentration action level. than 0.05 mg/m\3\.------------------------------------------------------------------------
Cell Room Monitoring Plan------------------------------------------------------------------------1. Details of your mercury
monitoring system.2. How representative sampling Include some pre-plan measurements
will be conducted. to demonstrate the profile of
mercury concentration in the cell
room and how the selected sampling
locations ensure conducted
representativeness.3. Quality assurance/quality Include a description of how you
control procedures for your will keep records or other means to
mercury monitoring system. demonstrate that the system is
operating properly.4. Your action level.............. Include the background data used to
establish your level.------------------------------------------------------------------------
Sec. Table 6 to Subpart IIIII of Part 63--Examples of Techniques for
Equipment Problem Identification, Leak Detection and Mercury Vapor
As stated in Tables 1 and 2 of Subpart IIIII, examples of techniques for equipment problem identification, leak detection and mercury vapor measurements can be found in the following table: ------------------------------------------------------------------------
You could use . . Principle of
To detect . . . . detection . . .------------------------------------------------------------------------1. Leaking vent hoses; liquid Visual inspections
mercury that is not covered by
an aqueous liquid in open-top
containers or end boxes; end
box covers or stoppers, amalgam
seal pot stoppers, or caustic
basket covers not securely in
place; cracks or spalling in
cell room floors, pillars, or
beams; caustic leaks; liquid
mercury accumulations or
spills; and equipment that is
leaking liquid mercury.2. Equipment that is leaking a. Auditory and
hydrogen and/or mercury vapor visual
during inspections required by inspections
Table 2 to this subpart.
b. Portable A sample of gas is
mercury vapor drawn through a
analyzer--ultravi detection cell
olet light where ultraviolet
absorption light at 253.7
detector. nanometers (nm)
is directed
perpendicularly
through the
sample toward a
photodetector.
Elemental mercury
absorbs the
incident light in
proportion to its
concentration in
the air stream.
c. Portable A sample of gas is
mercury vapor drawn through a
analyzer--gold detection cell
film amalgamation containing a gold
detector. film detector.
Elemental mercury
amalgamates with
the gold film,
changing the
resistance of the
detector in
proportion to the
mercury
concentration in
the air sample.
d. Portable short- Ultraviolet light
wave ultraviolet is directed
light, toward a
fluorescent fluorescent
background--visua background
l indication. positioned behind
a suspected
source of mercury
emissions.
Elemental mercury
vapor absorbs the
ultraviolet
light, projecting
a dark shadow
image on the
fluorescent
background.
e. Portable
combustible gas
meter.3. Level of mercury vapor in the a. Portable See Item 2.b.
cell room and other areas. mercury vapor
analyzer--ultravi
olet light
absorption
detector.
b. Portable See Item 2.c.
mercury vapor
analyzer--gold
film amalgamation
detector.
c. Permanganate A known volume of
impingement. gas sample is
absorbed in
potassium
permanganate
solution.
Elemental mercury
in the solution
is determined
using a cold
vapor adsorption
analyzer, and the
concentration of
mercury in the
gas sample is
calculated.------------------------------------------------------------------------ Sec. Table 7 to Subpart IIIII of Part 63--Required Elements of Washdown
Plans
As stated in Sec. 63.8192, your written washdown plan must address the elements contained in the following table: ------------------------------------------------------------------------
You must establish the
For each of the following areas . . . following as part of your plan
. . .------------------------------------------------------------------------1. Center aisles of cell rooms......... A description of the manner of
washdown of the area, and the
washdown frequency for the
area.2. Electrolyzers3. End boxes and areas under end boxes4. Decomposers and areas under
decomposers5. Caustic baskets and areas around
caustic baskets6. Hydrogen system piping7. Basement floor of cell rooms8. Tanks9. Pillars and beams in cell rooms10. Mercury cell repair areas11. Maintenance shop areas12. Work tables13. Mercury thermal recovery units14. Storage areas for mercury-
containing wastes------------------------------------------------------------------------
Sec. Table 8 to Subpart IIIII of Part 63--Requirements for Cell Room
Monitoring Program
As stated in Sec. 63.8192(g)(1), your mercury monitoring system must meet the requirements contained in the following table: ------------------------------------------------------------------------
If you utilize an . . . Your . . . Must . . .------------------------------------------------------------------------1. Extractive cold vapor a. Mercury vapor Be capable of
spectroscopy system. analyzer. continuously
monitoring the
elemental mercury
concentration with a
detection level at
least two times
lower than the
baseline mercury
concentration in the
cell room.
b. Sampling Obtain measurements
system. at three or more
locations along the
center aisle of the
cell room at a
height sufficient to
ensure that sample
is representative of
the entire cell
room. One sampling
location must be
above the midpoint
of the center aisle,
and the other two an
equidistance between
the midpoint and the
end of the cells.2. Open path differential a. Mercury vapor Be capable of
optical absorption analyzer. continuously
spectroscopy system. monitoring the
elemental mercury
concentration with a
detection level at
least two times
lower than the
baseline mercury
concentration in the
cell room.
b. Path.......... Be directed along the
center aisle at a
height sufficient to
ensure that the
sample is
representative of
the entire cell
room.------------------------------------------------------------------------
Sec. Table 9 to Subpart IIIII of Part 63--Required Records for Work
Practice Standards
As stated in Sec. 63.8256(c), you must keep the records (related to the work practice standards) specified in the following table: ------------------------------------------------------------------------
You must record the following
For each . . . information . . .------------------------------------------------------------------------1. Inspection required by Table 2 to Date and time the inspection
this subpart. was conducted.2. Situation found during an inspection a. Description of the
required by Table 2 to this subpart: condition.
leaking vent hose; open-top container b. Location of the condition.
where liquid mercury is not covered by c. Date and time you identify
an aqueous liquid; end box cover that the condition.
is not securely in place; end box d. Description of the
stopper that is not securely in place; corrective action taken.
end box where liquid mercury is not e. Date and time you
covered by an aqueous liquid at a successfully complete the
temperature below boiling; seal pot corrective action.
cover that is not securely in place;
open or mercury seal pot stopper that
is not securely in place; crack,
spalling, or other deficiency in a
cell room floor, pillar, or beam that
could cause liquid mercury to become
trapped; or caustic basket that is not
securely in place.3. Caustic leak during an inspection a. Location of the leak.
required by Table 2 to this subpart. b. Date and time you identify
the leak.
c. Date and time you
successfully stop the leak and
repair the leaking equipment.4. Liquid mercury spill or accumulation a. Location of the liquid
identified during an inspection mercury spill or accumulation.
required by Table 2 to this subpart or b. Estimate of the weight of
at any other time. liquid mercury.
c. Date and time you detect the
liquid mercury spill or
accumulation.
d. Method you use to clean up
the liquid mercury spill or
accumulation.
e. Date and time when you clean
up the liquid mercury spill or
accumulation.
f. Source of the liquid mercury
spill or accumulation.
g. If the source of the liquid
mercury spill or accumulation
is not identified, the time
when you reinspect the area.5. Liquid mercury leak or hydrogen leak a. Location of the leak.
identified during an inspection b. Date and time you identify
required by Table 2 to this subpart or the leak.
at any other time. c. If the leak is a liquid
mercury leak, the date and
time that you successfully
contain the dripping liquid
mercury.
d. Date and time you first
attempt to stop the leak.
e. Date and time you
successfully stop the leak and
repair the leaking equipment.
f. If you take a cell off line
or isolate the leaking
equipment, the date and time
you take the cell off line or
isolate the leaking equipment,
and the date and time you put
the cell or isolated equipment
back into service.
6. Occasion for which it is not a. Reason for not being able to
possible to perform the design, perform each procedure
operation and maintenance procedures determined to be not possible.
required by Item 2 of Table 1 to this b. Actions taken to reduce or
subpart. prevent mercury emissions, in
lieu of the requirements in
Table 1 to this subpart.------------------------------------------------------------------------
Sec. Table 10 to Subpart IIIII of Part 63--Applicability of General
Provisions to Subpart IIIII
As stated in Sec. 63.8262, you must comply with the applicable General Provisions requirements according to the following table: ----------------------------------------------------------------------------------------------------------------
Applies to Subpart
Citation Subject IIIII Explanation----------------------------------------------------------------------------------------------------------------Sec. 63.1.......................... Applicability.......... Yes....................Sec. 63.2.......................... Definitions............ Yes....................Sec. 63.3.......................... Units and Abbreviations Yes....................Sec. 63.4.......................... Prohibited Activities.. Yes....................Sec. 63.5.......................... Construction/ Yes....................
Reconstruction.Sec. 63.6(a)-(g), (i), (j)......... Compliance with Yes....................
Standards and
Maintenance
Requirements.Sec. 63.6(h)....................... Compliance with Opacity No..................... Subpart IIIII does not
and Visible Emission have opacity and
Standards. visible emission
standards.Sec. 63.7(a)(1), (b)-(h)........... Performance Testing Yes.................... Subpart IIIII specifies
Requirements. additional
requirements related
to site-specific test
plans and the conduct
of performance tests.Sec. 63.7(a)(2).................... Applicability and No..................... Subpart IIIII requires
Performance Test Dates. the performance test
to be performed on the
compliance date.Sec. 63.8(a)(1), (a)(3); (b); Monitoring Requirements Yes....................
(c)(1)-(4), (6)-(8); (d); (e); and
(1)-(4), (6)-(8); (d); (e); and
(f)(1)-(5).Sec. 63.8(a)(2).................... Continuous Monitoring No..................... Subpart IIIII requires
(1)-(5).Sec. 63.8(a)(2).................... Continuous Monitoring No..................... Subpart IIIII requires
System (CMS) a site-specific
Requirements. monitoring plan in
lieu of a promulgated
performance
specification for a
mercury concentration
CMS.Sec. 63.8(a)(4).................... Additional Monitoring No..................... Subpart IIIII does not
Requirements for require flares.
Control Devices in
Sec. 63.11.Sec. 63.8(c)(5).................... COMS Minimum Procedures No..................... Subpart IIIII does not
have opacity and
visible emission
standards.Sec. 63.8(f)(6).................... Alternative to Relative No..................... Subpart IIIII does not
Accuracy Test. require CEMS.Sec. 63.8(g)....................... Data Reduction......... No..................... Subpart IIIII specifies
mercury concentration
CMS data reduction
requirements.Sec. 63.9(a)-(e), (g)-(j).......... Notification Yes....................
Requirements.Sec. 63.9(f)....................... Notification of VE/ No..................... Subpart IIIII does not
Opacity Test. have opacity and
visible emission
standards.Sec. 63.10(a); (b)(1); (b)(2)(i)- Recordkeeping/Reporting Yes....................
(xii), (xiv); (b)(3); (c); (d)(1)-
(2), (4)-(5); (e); (f).Sec. 63.10(b)(2)(xiii)............. CMS Records for RATA No..................... Subpart IIIII does not
Alternative. require CEMS.Sec. 63.10(d)(3)................... Reporting Opacity or VE No..................... Subpart IIIII does not
Observations. have opacity and
visible emission
standards.Sec. 63.11......................... Flares................. No..................... Subpart IIIII does not
require flares.Sec. 63.12......................... Delegation............. Yes....................Sec. 63.13......................... Addresses.............. Yes....................Sec. 63.14......................... Incorporation by Yes....................
Reference.Sec. 63.15......................... Availability of Yes....................
Information.----------------------------------------------------------------------------------------------------------------
Subpart JJJJJ_National Emission Standards for Hazardous Air Pollutants
for Brick and Structural Clay Products Manufacturing
Source: 68 FR 26722, May 16, 2003, unless otherwise note.
What This Subpart Covers