Committee on NFPA 820
MEMORANDUM
TO:
NFPA Technical Committee on Wastewater Treatment Plants
FROM:
Jeanne Moreau-Correia
DATE:
February 2, 2010
SUBJECT:
NFPA 820 A11 ROP Letter Ballot
The ROP letter ballot for NFPA 820 is attached. The ballot is for formally voting on
whether or not you concur with the committee’s actions on the proposals. Reasons must
accompany all negative and abstention ballots.
Please do not vote negatively because of editorial errors. However, please bring such
errors to my attention for action.
Please complete and return your ballot as soon as possible but no later than Tuesday,
February 16, 2010. As noted on the ballot form, please submit the ballot to Jeanne
Moreau-Correia, e-mail to [email protected] or fax to 617-984-7110.
The return of ballots is required by the Regulations Governing Committee Projects.
Attachment: Proposals
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-1 Log #CP2
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Add following referenced publication to Chapter 2.
NFPA 91:
, 2010 Edition
A dding NFPA 91 to the list of referenced publications provides users of NFPA 820 with a reference
document for the proper design of exhaust systems for air conveying vapor and gases from wastewater treatment and
collection facilities.
_______________________________________________________________________________________________
820-2 Log #CP3
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Add following definition and annex note to Chapter 3, section 3.3 General Definitions and renumber
subsequent definitions as follows:
3.3.70* Waste Gas Burner (flare). A safety device used to combust excess digester gas. Waste gas burners reduce the probability
of odors or gas explosions caused by excess digester gas directly vented to the atmosphere by pressure‐relief valves.
A.3.3.70 Waste Gas Burner (flare). This text was paraphrased from MOP 8 “Design of Municipal Wastewater Treatment Plants”,
5th Edition, Volume 3: Solids Processing and Management. Published by the Water Environment Federation, 601 Wythe Street,
Alexandria, VA 22314. (703) 684‐2400.
3.3.701 Wastewater.
3.3.701.1Domestic Wastewater.
3.3.701.2 Residential Wastewater.
3.3.712 Well.
3.3.712.1* Dry Well.
3.3.712.2* Wet Well.
Adding definition provides clarification for equipment covered by Table 6.2(a), Row 19.
_______________________________________________________________________________________________
820-3 Log #4
_______________________________________________________________________________________________
Jason Knecht, Golden Heart Utilities
Add new text to read as follows:
Above grade wastewater pumping station: Pump room physically separated with no personnel access or an approved
vapor tight access to wet well.
I am upgrading the electrical for an existing enclosed lift station. The aboveground section houses the
electrical and motors. It is on top of the wet well and is separated from the wet well via concrete floor. However, there is
access to the wet well inside. I would like to install vapor tight manhole to keep aboveground unclassified.
The TC requests that the submitter provide information and documentation regarding
approvable vapor tight covers in the form of a public comment. The committee points out that once there is an access
point between two adjacent rooms, there is no longer a maintainable physical separation. This creates a potential
breakdown in hazard classifications between each room. The committee also points out that the submitter may propose
a new row in Table 4.2 with an appropriate method to mitigate potential hazards with proper ventilation or other
protection requirements.
Printed on 1/29/2010
1
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-4 Log #CP5
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Make following editorial changes (add/delete) to text in Table 5.2 Liquid Stream Treatment
Processes to clarify intention of text. Delete word “not” in Rows 7, 10, 14, 15 and 16.
*****Insert Table_5.2_Log CP5 Here****
Editorial changes necessary to clarify intended meaning of row information. Deletion of the word “not”
from the “NEC” column in rows 7, 10, 14, 15 and 16 clarifies that the spaces are “unclassified” when they are preceded
by primary sedimentation which would remove floatable flammable and/or combustible materials. Classification of
primary sedimentation or wastewater that has not undergone primary sedimentation would be covered by the
classifications in Table 5.2 Row 6.
_______________________________________________________________________________________________
820-5 Log #CP7
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Make following editorial changes (add/delete) to text in Table 5.2 Liquid Stream Treatment
Processes to clarify intention of text. Add NA and change NA to NR in several rows.
****Insert Table_5.2_Log #CP7 Here*****
Editorial changes necessary to clarify intended meaning of row information. NR is the appropriate text
when ventilation is not required. NA is the appropriate text when requirements of a column do not apply to a “row”
location.
Printed on 1/29/2010
2
Table 5.2 Liquid Stream Treatment Processes
Row
7
Line
Location and
Function
Fire and
Explosion
Hazard
AERATION
BASIN, POND,
LAGOON,
OXIDATION
DITCH,
AEROBIC
SUSPENDED
GROWTH
SYSTEMS,
SEQUENCING
BATCH
REACTORS
Ventilation
Extent of
Classified
Area1
NA
Classified (See
Primary
Sedimentation)
TRICKLING
FILTER, BIOTOWER,
AEROBIC
FIXED-FILM
SYSTEMS
Aerobic
biological
treatment of
wastewater
14
INTERMEDIAT
E,
SECONDARY,
OR TERTIARY
SEDIMENTATI
ON TANKS
Not
normally a
significant
hazard;
however,
these
processes
might
contain
materials
that are
combustible
under
certain
conditions
NA
Classified (See
Primary
Sedimentation)
FLASH MIXER
OR
Fire
Protection
Measures
NR
H
NR
H
NR
H
NR
H
Unclassified, (If
process is not
preceded by
primary
sedimentation.,
see Primary
Sedimentation
Tanks in Table
5.2 for
classification.)
NA
NA
Classified (See
Primary
Sedimentation)
Unclassified, (If
process is not
preceded by
primary
sedimentation.,
see Primary
Sedimentation
Tanks in Table
5.2 for
classification.)
Separate floating
and settleable
solids from
wastewater at
various treatment
stages
15
Material of
Construction
for Buildings or
Structures
Unclassified, (If
process is not
preceded by
primary
sedimentation.,
see Primary
Sedimentation
Tanks in Table
5.2 for
classification.)
Aerobic
treatment of
wastewater open
to the
atmosphere
10
NEC-Area
Electrical
Classification
(All Class I,
Group D)
NA
NA
Classified (See
Primary
1
NFPA 820 Log #CP5 Rec A2011 ROP
FLOCCULATIO
N TANKS
Sedimentation)
Unclassified, (If
process is not
preceded by
primary
sedimentation.,
see Primary
Sedimentation
Tanks in Table
5.2 for
classification.)
Tanks for mixing
various treatment
chemicals with
wastewater
16
NITRIFICATIO
N AND
DENITRIFICAT
ION TANKS
Tertiary
treatment of
wastewater to
reduce or remove
nitrogen
NA
NA
Classified (See
Primary
Sedimentation)
Unclassified, (If
process is not
preceded by
primary
sedimentation.,
see Primary
Sedimentation
Tanks in Table
5.2 for
classification.)
2
NFPA 820 Log #CP5 Rec A2011 ROP
NR
H
Table 5.2 Liquid Stream Treatment Processes
Row
7
Line
Location and
Function
AERATION BASIN,
POND, LAGOON,
OXIDATION
DITCH, AEROBIC
SUSPENDED
GROWTH
SYSTEMS,
SEQUENCING
BATCH
REACTORS
Fire and
Explosion
Hazard
NEC-Area
Electrical
Classification
(All Class I,
Group D)
Material of
Construction
for Buildings
or
Structures
Fire
Protection
Measures
Ventilation
Extent of
Classified
Area1
NA
NAR
NA
Unclassified
(If process is
not preceded
by primary
sedimentation,
see Primary
Sedimentation
Tanks in
Table 5.2 for
classification.)
NR
H
NA
NR
Entire
enclosed
space
Unclassified
NC, LC, or
LFS
NR
Not
normally a
significant
hazard;
however,
these
processes
might
contain
materials
that are
combustible
under
certain
conditions
NAR
NA
Unclassified
(If process is
not preceded
by primary
sedimentation,
see Primary
Sedimentation
Tanks in
Table 5.2 for
classification.)
NR
H
NA
NAR
NA
Unclassified
(If process is
not preceded
by primary
sedimentation,
see Primary
Sedimentation
Tanks in
Table 5.2 for
classification.)
NR
H
Aerobic treatment
of wastewater open
to the atmosphere
9
ENCLOSED
AERATION BASIN,
AEROBIC OR
SUSPENDED
GROWTH
SYSTEMS,
MEMBRANE
BIOLOGICAL
REACTORS
Aerobic treatment of
wastewater preceded
by primary treatment
10
TRICKLING
FILTER, BIOTOWER, AEROBIC
FIXED-FILM
SYSTEMS
Aerobic biological
treatment of
wastewater
14
INTERMEDIATE,
SECONDARY, OR
TERTIARY
SEDIMENTATION
TANKS
Separate floating and
settleable solids from
wastewater at various
treatment stages
1
NFPA 820 Log #CP7 Rec A2011 ROP
15
FLASH MIXER OR
FLOCCULATION
TANKS
NA
NAR
NA
Unclassified
(If process is
not preceded
by primary
sedimentation,
see Primary
Sedimentation
Tanks in
Table 5.2 for
classification.)
NR
H
NA
NAR
NA
Unclassified
(If process is
not preceded
by primary
sedimentation,
see Primary
Sedimentation
Tanks in
Table 5.2 for
classification.)
NR
H
NA
NAR
NA
Unclassified
NR (These
unit
processes use
corrosive
chemicals
that require
the use of
specific
materials of
construction.
Special
consideration
shall be given
to these
materials of
construction.)
H
NA
NAR
NA
Unclassified
NR
H
NA
NAR
NA
Unclassified
NR
H
NA
NAR
NA
Unclassified
NR
H
Tanks for mixing
various treatment
chemicals with
wastewater
16
NITRIFICATION
AND
DENITRIFICATION
TANKS
Tertiary treatment of
wastewater to reduce
or remove nitrogen
17
BREAKPOINT
CHLORINATION
TANKS AND
CHLORINE
CONTACT TANKS
Application of
chlorine in aqueous
solution to
wastewater
19
INTERMEDIATE
OR FINAL
PUMPING
STATIONS
Pump(s) at
intermediate stage or
end of the treatment
process
20
GRAVITY AND
PRESSURE
FILTERS
Filtering of treated
wastewater through
sand or other media
24
ULTRAVIOLET
DISINFECTION
UNIT
Disinfection of
wastewater effluent
by ultraviolet
2
NFPA 820 Log #CP7 Rec A2011 ROP
radiation
25
EFFLUENT
STRUCTURES
NA
NAR
NA
Unclassified
Various structures
conveying treated
wastewater away
from treatment
processes
3
NFPA 820 Log #CP7 Rec A2011 ROP
NR
H
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-6 Log #CP8
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Add new text as follows at the bottom of Tables 5.2:
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space,
and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to Figure A.5.2 and specific requirements for each location and function.
(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FE: Portable fire extinguisher.
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NR: No requirement.
Footnotes:
1
Open channels and open structures upstream from the unit processes are classified the same as the downstream
processes they supply.
2
The area beyond the envelope is unclassified.
3
Where liquid turbulence is not induced by aeration or other factors, the following criteria apply: (1) interior of the tank
from the minimum operating water surface to the top of the tank wall; (2) envelope 0.46 m (18 in.) above the top of the
tank and extending 0.46 m (18 in.) beyond the exterior wall; (3) envelope 0.46 m (18 in.) above grade extending 3 m (10
ft) horizontally from the exterior tank walls.
This proposal editorially clarifies the application difference between footnote numbers within the table
and the notes that are listed below to accompany the table.
Printed on 1/29/2010
3
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-7 Log #CP9
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Make following editorial changes (add/delete) to text in Table 5.2 Liquid Stream Treatment
Processes to clarify intention of text. 1. Add “MEMBRANE BIOLOGICAL REACTORS” (MBRs) to Row 9 to clarify
intended application of row.
******See Include Table_5.2_CP9*****
Editorial changes necessary to clarify intended meaning of row information. MBRs were added to Table
5.2 during the revision of the 2008 edition of this standard. Failure to add MBRs to Row 9 was an editorial oversight.
Printed on 1/29/2010
4
Table 5.2 Liquid Stream Treatment Processes
Row
9
Line
Location and
Function
ENCLOSED
AERATION
BASIN OR,
AEROBIC OR
SUSPENDED
GROWTH
SYSTEMS,
MEMBRANE
BIOLOGICAL
REACTORS
Fire and
Explosion
Hazard
Ventilation
NA
NR
Extent of
Classified
Area1
Entire
enclosed
space
NEC-Area
Electrical
Classification
(All Class I,
Group D)
Unclassified
Aerobic treatment
of wastewater
preceded by
primary treatment
1
NFPA 820 Log #CP9 Rec A2011 ROP
Material of
Construction
for Buildings
or Structures
NC, LC, or
LFS
Fire
Protection
Measures
NR
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-8 Log #CP10
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Make following editorial changes add footnote 4 to Table 5.2 and 3 to Table 6.2(a) to clarify intention
of text. Add statement of clarification concerning electrical equipment used in areas with deteriorating effects to NEC
hazard column.
*****Insert Table_5.2_ and Table_6.2(a)_Log #CP10 Here****
Editorial changes necessary to clarify intended meaning of row information. Additional text in Row 17
clarifies the importance of providing electrical equipment appropriate for use in areas with deteriorating agents that may
damage electrical conductors and/or equipment creating hazards of fire, explosion, electric shock and electrocution.
While this fundamental requirement is found in NEC 110.11 and 300.6, improperly installed and maintained electrical
equipment is common in wastewater treatment and collection facilities. Improperly installed and maintained equipment
poses risks of fire, explosion, electric shock and electrocution.
The following photos illustrate the importance of installing electrical equipment identified for use in wastewater treatment
and collection operating environments. Photos included in the proposal are merely for illustrative purposes to convey the
substantiation for this proposal and are not intended for use in NFPA 820.
*******See Include Figure1CP10*********
*******See Include Figure2CP10*********
*******See Include Figure3CP10*********
Printed on 2/2/2010
1
Table 5.2 Liquid Stream Treatment Processes
NEC-Area
Material of
Electrical
Location
Fire and
Extent of
Fire
Construction
Classification
and
Explosion
Classified
Protection
for Buildings or
(All Class I,
Group D) 4
Row Line Function
Hazard
Ventilation
Area1
Structures
Measures
4
These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical
equipment shall be identified for use in the operating environment.
Table 6.2(a) Solids Treatment Processes
Row
Line
Location
and
Function
Fire and
Explosion
Hazard
Ventilation1,3
Extent of
Classified
Area
NEC-Area
Electrical
Classification
(All Class I,
Group D) 3
3
Material of
Construction
for Buildings
or Structures
Fire
Protection
Measures
These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical
equipment shall be identified for use in the operating environment.
1
NFPA 820 Log #CP10 Rec A2011 ROP
Figure 1. Electrical switch in a wastewater treatment facility damaged by corrosion.
Figure 2. Explosion-proof switch and outlet box in a
wastewater collection facility damaged by corrosion.
Figure 3. Electrical switch in a chlorine handling room
damaged by corrosion.
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-9 Log #CP11
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Make following editorial changes (add/delete) to text in Table 5.2 Liquid Stream Treatment
Processes to clarify intention of text. Add word “effluent” to Row 24.
****See Include Table 5.2_Log #CP11*****
Editorial changes necessary to clarify intended meaning of row information. Row 24 is only intended to
apply to the use of UV disinfection for the treatment of wastewater effluent. Wastewater effluent poses no known fire
and explosion hazards, however, other points in the treatment process may pose significant fire and explosion hazards.
UV disinfection installed in other wastewater treatment and collection locations must comply with the appropriate
provisions of Tables 5.2, 6.2(a) and 6.2(b). No other uses for UV disinfection are known or anticipated by the committee
at the time of this revision. Any current or future use of UV disinfection for other treatment processes must be approved
by the AHJ and should be submitted as a proposal for future editions of NFPA 820.
Printed on 1/29/2010
6
Table 5.2 Liquid Stream Treatment Processes
Row
24
Line
Location and
Function
ULTRAVIOLET
DISINFECTION
UNIT
Fire and
Explosion
Hazard
Ventilation
NA
Extent of
Classified
Area1
NA
NEC-Area
Electrical
Classification
(All Class I,
Group D)
Unclassified
Disinfection of
wastewater
effluent by
ultraviolet
radiation
1
NFPA 820 Log #CP11 Rec A2011 ROP
Material of
Construction
for Buildings
or
Structures
Fire
Protection
Measures
NR
H
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-10 Log #CP13
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Discuss Row 16 and establish a working group to examine current denitrification processes using
flammable and/or combustible liquids such as methanol. Develop proposal for modification or provide guidance to users
of NFPA 820 regarding the safe use of these materials in wastewater treatment and collection facilities that are beyond
“incidental” use.
NFPA 820 does not currently address the safe use of flammable and/or combustible liquids for
denitrification treatment of wastewater. On January 11, 2006, two municipal wastewater treatment plant workers died
and another was seriously injured while attempting to remove a steel canopy above a methanol storage tank at the
Bethune Point wastewater plant operated by the City of Daytona Beach. The workers were using a cutting torch that
likely ignited methanol vapors from the tank and caused an explosion. The explosion led to the release of the total
contents of the tank, approximately 3,000 gallons of methanol. Investigation revealed issues that could be addressed in
NFPA 820.
The committee is asked to review the following video and information from the United States Chemical Safety Board
(CSB) investigation into this tragic accident and determine if area classification is appropriate:
http://www.csb.gov/investigations/detail.aspx?SID=21.
Specifically, the CSB requested the Water Environment Federation (WEF) and the Methanol Institute to address the
issue of area classification. This issue is best addressed by the NFPA Technical Committee on Wastewater Treatment
Plants.
The committee is rejecting this committee proposal as a means to create a placeholder for this
material at the ROC phase. The TC plans to formulate a task group and comment at the ROC phase.
_______________________________________________________________________________________________
820-11 Log #3
_______________________________________________________________________________________________
John N. Harrell, Wilson & Company
Revise text as follows:
On Extent of classified area, delete reference to footnotes 2, 3.
" ...around equipment and open channel 2, 3 "
The footnotes refer to tanks and are not applicable to screening facilities. The footnote reference has
caused confusion with contractors and manufacturers.
Printed on 1/29/2010
7
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-12 Log #CP6
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Add new text as follows at the bottom of Tables 6.2.(a):
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space,
and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to the specific figures in A.6.2 and for specific requirements for each
location and function.
(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FAS: Fire alarm system.
FDS: Fire detection system.
FE: Portable fire extinguisher.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NNV: Not normally ventilated.
NR: No requirement.
Footnote:
1
The area beyond the envelope is unclassified.
2
See NFPA 54, NFPA 82, and NFPA 85.
This proposal editorially clarifies the application difference between footnote numbers within the table
and the notes that are listed below to accompany the table.
_______________________________________________________________________________________________
820-13 Log #1
_______________________________________________________________________________________________
Paul J. McGuire, Northeast Ohio Regional Sewer District
There appears to two unit conversion mistakes in row 24b and 24c:
"Areas within 1.5 m 0.9 m (3 ft) of leakage sources such as fans..."
and
"Areas beyond 1.5 m 0.9 m (3 ft)"
3 ft = 36 in. and 36 in. x 0.0254 m/in. = 0.9144m. Rounded to a single decimal point is 0.9 m.
Compare page 830-27, Table 5.2, Row 26 also for Odor-Control System Areas, where 0.9 m is correctly used as the
metric conversion for 3 ft.
This correction has already been made with the 2008 edition of NFPA 820. The TC also notes
that this material is under Row 25 of Table 6.2(a).
Printed on 1/29/2010
8
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-14 Log #CP22
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Add new text as follows at the bottom of Tables 6.2(b):
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space
and, therefore, Table 9.1.1.4 also has no requirements.
(2) The following codes are used in this table:
FAS: Fire alarm system.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
NEC: In accordance with NFPA 70.
NC: Noncombustible material.
NR: No requirement.
Footnotes:
1
For sludge-drying processes that use flammable or combustible liquids, ventilate in accordance with NFPA 30.
2
Or if acceptable to the authority having jurisdiction with classification in NFPA 499.
3
See NFPA 54, NFPA 85, NFPA 499, and NFPA 654. For sludge-drying processes that use flammable or combustible
liquids, see NFPA 30.
4
The area beyond the envelope is unclassified.
This proposal editorially clarifies the application difference between footnote numbers within the table
and the notes that are listed below to accompany the table.
_______________________________________________________________________________________________
820-15 Log #6
_______________________________________________________________________________________________
Alex Reed, Brown and Cladwell
Revise text as follows:
All continuous Ventilation systems that are used to down grade the classification of a space shall be fitted with flow
detection devices connected to alarm signaling systems to indicate ventilation system failure to provide the required air
changes.
The existing text is not clear. There is not a definition of "continuous ventilation" in NFPA 820. There is
not a reason to require ventilation alarms unless the ventilation is used to change the classification of the space. For
instance if a fan is configured to run all of the time in a classified area that does not have it's classification reduced then
the existing sentence could be interpreted to require monitoring, and the solution is either to provide flow monitoring or
provide automatic control so that the control does not appear to be "continuous".
Today I was informed by a mechanical design lead that 7.5.1 means that any space that is discussed in NFPA 820 that
also has ventilation shall have ventilation alarms. If that is the intent the sentence should be re-worded as follows:
All continuous Ventilation systems that are associated with areas discussed in NFPA 820 shall be alarmed per table
7.5.3.
Revise text as follows:
All continuous ventilation systems that are used to downgrade the classification of a space shall be fitted with flow
detection devices connected to alarm signaling systems to indicate ventilation system failure to provide the required air
changes.
The committee believes that Merriam-Webster clearly defines the word "continuous" and that it
fits with the word as used in NFPA 820 and did not omit it from the requirement as suggested. The committee agrees
with the submitter's other changes, as it provides clarity.
Printed on 1/29/2010
9
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-16 Log #5
_______________________________________________________________________________________________
Alex Reed, Brown and Cladwell
Revise text as follows:
Remote signaling systems shall be in accordance with the requirements for supervised signaling systems as set forth
in NFPA 72 monitored continuously by staff having the authority to make decisions regarding plant operation.
The existing text does not communicate what the authors of NFPA 820 intended. The existing text has
been misinterpreted to mean that a UL listed Fire Alarm panel is required and that the fire department is required to
receive the alarms from the Fire Alarm panel. I have also seen that words "supervised signaling system" mean that the
circuit is to be electrically designed as a Supervised Circuit; so that a false open or false close will cause a circuit failure
alarm.
I am interpreting this sentence per the revised text attached with the understanding that the revised text is what was
intended by NFPA 820. It would save time in discussing the intent of this sentence, save equipment that is not required,
and provide a more appropriate response to these alarms if the sentence is re-written to be more clear or deleted.
The committee believes that NFPA 72 fire alarms are needed to provide reliable assurances for
alarming on failure of classification reduction systems.
_______________________________________________________________________________________________
820-17 Log #CP19
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Revise 9.2.1 and 9.2.2 as follows:
9.2.1 Ventilation systems serving spaces governed by this standard shall be designed in accordance with NFPA 90A
NFPA 91.
9.2.2 NFPA 90A NFPA 91 shall not apply to the design of ventilation systems where superseded by a more restrictive
provision of this standard.
NFPA 91, The Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and
Noncombustible Particulate Solids, is the more appropriate document to be referenced and used for installation of
ventilation systems in NFPA 820 rather than NFPA 90A, The Standard for the Installation of Air-Conditioning and
Ventilating Systems.
_______________________________________________________________________________________________
820-18 Log #2
_______________________________________________________________________________________________
Paul J. McGuire, Northeast Ohio Regional Sewer District
Although Annex A is not part of the requirements of this NFPA document, the diagrams should be
consistent with the text in the rest of the document. The text consistently converts 10 ft as 3 meters. The diagrams in
Annex A show 10 ft as 3.1 meters. 3.1 meters represents a rounding error. Proposed text: 3.1 m 3 m (10 ft).
See Figure A.5.2 (1 place), Figure A.6.2(a) (1 place), Figure A.6.2(b) (2 places), Figure A.6.2(c) (1 place), Figure
A.6.2(d) (2 places), Figure A.6.2(e) (2 Places), Figure A.6.2(f) (1 place), Figure A.6.2(g) (2 places).
10 ft = 120 in. and 120 in. x 0.0254 m/in. = 3.048 m. Rounded to a single decimal point is 3.0 or 3 m.
Revise the suggested figures and all other conversions throughout the document as follows:
3.1.0 m (10 ft)
3.0 m (10 ft)
The TC agrees with the submitter's proposal and floats the number out to the tenths digit for
consistency with the rest of the standard.
Printed on 1/29/2010
10
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-19 Log #CP16
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Add following text and referenced publication to A.9.3.3.
A.9.3.3 Ventilation rates and procedures established by this standard might not be sufficient to protect personnel from
exposure to toxic gases that might be present in enclosed spaces. For further information, refer to Industrial Ventilation
—A Manual of Recommended Practice for Design, published by the American Conference of Governmental Industrial
Hygienists (ACGIH) and 29 CFR 1910.1000, Air Contaminants.
Adding the ACGIH “Industrial Ventilation” manual to this annex provides users with an accepted
reference for the design of ventilations systems for the personnel protection in wastewater treatment and collection
facilities. This is consistent with NFPA 91 which also includes this as a reference document for the proper design of
exhaust systems for air conveying vapor and gases.
_______________________________________________________________________________________________
820-20 Log #CP15
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Add text to Annex B Wastewater Treatment Processes
B.1 General. Annex B provides a general overview and layout of the unit processes found at a typical wastewater
treatment plant, although the arrangement of the unit processes varies from plant to plant. For additional information on
the design and operation of wastewater treatment and collection facilities, refer to the most current Manual of Practice
(MOP) published by the Water Environment Federation (WEF).
Adding WEF Manuals of Practice to Annex B provides users with updated current references for
clarification on design and operation principles of wastewater treatment and collection facilities. MOP 8 is the
informational source for proposed definition of waste gas burner. Older versions of the MOPs have been referenced in
prior editions of NFPA 820 Annex F.
_______________________________________________________________________________________________
820-21 Log #CP18
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Revisions to Annex D Chemical and Fuel Fire/Explosion Hazards, section D.5.3. Revise Chlorine
Institute (CI) reference.
D.5.3 Chlorine is a very reactive chemical and necessitates special consideration in storing and handling. Chlorine in
combination with other chemicals can produce sufficient heat to cause combustion of flammable materials. Chlorine and
other reactive chemicals should always be stored separately. (See informational references from the Chlorine Institute,
Properties of Chlorine in Annex F.)
Editorial revision referring NFPA 820 users to CI publications addressing chlorine hazards in
wastewater treatment and collection facilities.
Printed on 1/29/2010
11
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-22 Log #CP14
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Editorial revisions to Annex F Informational References, section F.2. Informational References.
Move the WEF publications to section F.1.2 and update the reference to the current editions of the publications, add
MOP 7 to list of publications.
Renumber current section F.1.2.5 to F.1.2.7.
F.1.2.6 WEF Publications.
Water Environment Federation, 601 Wythe Street, Alexandria, VA 22314.
Wastewater Collection Systems Management — Manual of Practice (MOP) 7, 6th Edition, 2009.
Design of Municipal Wastewater Treatment Plants — Manual of Practice (MOP) 8, 5th Edition, 2009.
Operation of Municipal Wastewater Treatment Plants — Manual of Practice (MOP) 11, 6th Edition, 2007.
F.1.2.57 Other Publications.
F.2 Informational References.
Water Pollution Control Federation, Wastewater Treatment Plant Design, Manual of Practice #8, Alexandria, VA, 1990.
Water Pollution Control Federation, Wastewater Treatment Plant Operations, Manual of Practice #11, Alexandria, VA
1990.
Adding WEF publications to “other publications” provides users of NFPA 820 Annex B with references
for clarification on design and operation principles for wastewater treatment and collection facilities. MOP 8 is the
informational source for proposed definition of waste gas burner.
_______________________________________________________________________________________________
820-23 Log #CP17
_______________________________________________________________________________________________
Technical Committee on Wastewater Treatment Plants,
Editorial revisions to Annex F Informational References, section F.2. Informational References. Add
ACGIH publications to section F.1.2 and section F.2 to remain consistent with other NFPA documents, including NFPA
91-2010. Renumber subsequent publication reference lines in F.1.2. Add new document to list of publications from the
Chlorine Institute (CI).
F.1.2.1 ACGIH Publications. American Conference of Governmental Industrial Hygienists, 1330 Kemper Meadow Drive,
Cincinnati, OH 45240-1634. Industrial Ventilation —A Manual of Recommended Practice for Design, 27th edition, 2010.
F.1.2.12 ASTM Publications
F.1.2.23 CI Publications.
Properties of Chlorine, edition No. 2, 1986.
, 2008.
2007
F.1.2.45 U.S. Government Publications. U.S. Government Printing Office, Washington, DC 20402.
Title 40, Code of Federal Regulations, Part 761.30.
OSHA, Title 29, Code of Federal Regulations, Part 1910.156.
OSHA, Title 29, Code of Federal Regulations, Part 1910.1000.
F.2 Informational References.
ACGIH,
, 2007.
Adding the ACGIH “Industrial Ventilation” manual to this annex provides users with an accepted
reference for the design of ventilations systems for the personnel protection in wastewater treatment and collection
facilities. This is consistent with NFPA 91 which also includes this as a reference document for the proper design of
exhaust systems for air conveying vapor and gases. Adding CI Pamphlets 155 and 164 provide users of NFPA 820 with
updated reference documents addressing the hazards of chlorine in wastewater treatment and collection facilities.
Printed on 1/29/2010
12
Report on Proposals – June 2011
NFPA 820
_______________________________________________________________________________________________
820-24 Log #8
_______________________________________________________________________________________________
Bob Eugene, Underwriters Laboratories Inc.
Revise text to read as follows:
Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096.
Hazardous Location Equipment Directory, 1989 2009.
Update referenced standard to most recent revision.
Printed on 1/29/2010
13