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Committee Input No. 810-NFPA 13-2016 [ Section No. 1.6 ]
1.6 Units and Symbols.
1.6.1 Units.
1.6.1.1
Metric units of measurement in this standard shall be in accordance with the modernized metric system
known as the International System of Units (SI).
1.6.1.2
Two units (liter and bar), outside of but recognized by SI, are commonly used in international fire
protection.
1.6.1.3
These units with conversion factors shall be used as listed in Table 1.6.1.3 .
Table 1.6.1.3 Conversion Factors
Name of Unit
Unit Symbol
Conversion Factor
liter
L
1 gal = 3.785 L
millimeter per minute
mm/min
cubic decimeter
dm3
1 gal = 3.785 dm3
pascal
Pa
1 psi = 6894.757 Pa
bar
bar
1 psi = 0.0689 bar
bar
bar
1 bar = 105 Pa
1 gpm/ft2 = 40.746 mm/min =
40.746 (L/min)/m2
Note: For additional conversions and information, see ASTM SI10, Standard for Use of the International
System of Units (SI): The Modern Metric System.
1.6.1.4
If a value for measurement as given in this standard is followed by an equivalent value in other units, the
first stated shall be regarded as the requirement.
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1.6.2 Hydraulic Symbols.
The standard abbreviations in Table 1.6.2 shall be used on the hydraulic calculation form discussed in
Chapter 23 .
Table 1.6.2 Hydraulic Symbols
Symbol or
Abbreviation
Item
p
Pressure in psi
gpm
U.S. gallons per minute
q
Flow increment in gpm to be added at a specific location
Q
Summation of flow in gpm at a specific location
Pt
Total pressure in psi at a point in a pipe
Pf
Pressure loss due to friction between points indicated in location column
Pe
Pressure due to elevation difference between indicated points. This can be a plus
value or a minus value. If minus, the (-) shall be used; if plus, no sign is needed.
Pv
Velocity pressure in psi at a point in a pipe
Pn
Normal pressure in psi at a point in a pipe
E
90-degree ell
EE
45-degree ell
Lt.E
Long-turn elbow
Cr
Cross
T
Tee-flow turned 90 degrees
GV
Gate valve
BV
Butterfly (wafer) check valve
Del V
Deluge valve
ALV
Alarm valve
DPV
Dry pipe valve
CV
Swing check valve
WCV
Butterfly (wafer) check valve
St
Strainer
psi
Pounds per square inch
v
Velocity of water in pipe in feet per second
K
K-factor
C-factor
Friction loss coefficient
1.6.3*
Some dimensions used in this standard are exact and some are not. Nominal dimension are often used,
such as the dimensions used for pipe sizes. The metric equivalent shown in this standard might not be an
exact conversion to the SI unit, but the nominal metric equivalent is typically used or a reasonably
equivalent value or approximate conversion is used. It shall be acceptable to use the exact conversion or
the conversions stated in the standard, even though they might not be exact.
Supplemental Information
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Description
SSD_CI_810.docx
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Committee Statement: Committee wishes to review conversion factors and metric policy.
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1.6 Units and Symbols.
1.6.1 Units.
1.6.1.1 Metric units of measurement in this standard shall be in accordance with the modernized metric system known as the
International System of Units (SI).
1.6.1.2 Two units (liter and bar), outside of but recognized by SI, are commonly used in international fire protection.
1.6.1.3 These units with conversion factors shall be used as listed in Table 1.6.1.3.
Table 1.6.1.3 Conversion Factors Length Area Volume Flow Pressure Density Weight k‐factor Name of Unit millimeter meter Unit Symbol mm m square millimeters mm2 square Meter Conversion Factor 1in. = 25.4 mm 1ft. = .3048 m 1 in.2 = 645.2 mm2 2
1 ft2 = 0.0929 m2 3
m cubic Meter Liter pre minute bar millimeter/minute m L/min bar mm/min 1 ft3 = 0.02832 m3 1 gpm = 3.7848 L/min 1 psi = 0.0689 bar 1 gpm/ft2 = 40.746 mm/min liter/minute/m2 kilogram (L/min)/m2 kg 1 gpm/ft2 = 40.746 (L/min)/m2 1 lb = 0.4536 kg
k‐factor Fahrenheit Temperature Celsius Formatted: Superscript
L/min/(bar)2 1gpm/(psi)2 = 14.285 L/min/(bar)2 F° F° = 9/5 x C° + 32 C° C° = 5/9 (F° ‐ 32) 1.6.1.4 If a value for measurement as given in this standard is followed by an equivalent value in other units, the first stated
shall be regarded as the requirement.
1.6.2 Hydraulic Symbols. The standard abbreviations in Table 1.6.2 shall be used on the hydraulic calculation form discussed
in Chapter 23.
1.6.23* Some dimensions used in this standard are exact and some are not. Nominal dimension are often used, such as the
dimensions used for pipe sizes. The metric equivalent shown in this standard might not be an exact conversion to the SI
unit, but the nominal metric equivalent is typically used or a used. It shall be acceptable to Uuse of the exact metric conversion or
the
conversions stated in the standard, shall be acceptable even though they might not be exact.
A.1.6.23 Some dimensions used in this standard are exact and some are not. Nominal dimension are often used, such as the
dimensions used for pipe sizes. The metric equivalent shown in this standard might not be an exact conversion to the SI
unit, but the nominal metric equivalent is typically used or a reasonably equivalent value or approximate conversion is used.
Some dimensions used in this standard require a tight precision and others do not. For example, when performing
hydraulic calculations more precision is required than when specifying a nominal dimension. An example is pipe sizes, where we
typically refer to a nominal diameter rather than the exact diameter. The metric equivalents also have a set of generally accepted
nominal measurements, and they are not a precise conversion from the “English Unit” nominal dimension. Throughout the
standard the generally accepted nominal pipe sizes have been used. see Table A.1.6.3 Metric Trade Sizes for Pipe. For
example 1 in. pipe = 25 mm, 11⁄4 in. pipe = 32 mm, 11⁄2 in. pipe = 40 mm, and so forth. In other cases, rounding is used and the
number of significant digits taken into account. For example, a 30 ft ceiling would be 9.144 m. This implies a level of precision
that is higher than used for the original dimension, and a conversion to 9.1 m or even 9 m is more appropriate. Another example
is that in the standard, 1 in. has been converted to 25 mm and not 25.4 mm, 2 in. to 50 mm, 6 in. to 150 mm, and so forth. Finally,
locally available material can have different characteristics in countries that use metric units than are typically found in the
United States. Examples are things like standard door or window sizes, rack dimensions, and so forth. In these cases an
approximate conversion can also be used. Where approximate conversions have been used, it is acceptable for a designer or
installer to use an exact conversion rather than the
approximate conversion used in the standard.
Commented [HD1]: Move to Chapter 19 with other hydraulic requirements?
Formatted: Font: Bold
Formatted: Font: Bold
Table A.1.6.3 Metric Trade Sizes for Pipe in. mm in. mm in. mm 1/8 3 2 50 10 250 1/4 6 2‐1/2 65 12 300 3/8 10 3 80 14 350 1/2 15 3‐1/2 90 16 400 3/4 20 4 100 18 450 1 25 5 125 20 500 1‐1/4 32 6 150 24 600 1‐1/2 40 8 200 ‐ ‐ Formatted Table
Formatted: Centered
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Committee Input No. 727-NFPA 13-2016 [ New Section after 3.4.5 ]
3.4.5.1 Low Differential Dry Pipe Valves
Where the air/nitrogen to water ratio to keep a dry valve closed is greater than 1 in 6.
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Committee
Statement:
During the last revision there was debate on what constituted low differential. This would add
a definition to remove subjectivity.
The committee wishes to further research the origin of this issue in the standard.
Response
Message:
Public Input No. 267-NFPA 13-2016 [New Section after 3.4.5]
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Committee Input No. 728-NFPA 13-2016 [ Section No. 7.2.5.4.2 ]
7.2.5.4.2 Low Differential Dry Pipe Valve.
Protection against accumulation of water above the clapper shall be provided for low differential dry pipe
valves in accordance with 7.2.5.4.3.
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Committee Statement
Committee Statement: The committee is reviewing the definition of low differential dry pipe valves.
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Committee Input No. 675-NFPA 13-2016 [ New Section after 8.5.4.2 ]
Incorportate information from Fire Protection Research Foundation project on sloped ceilings and
storage occupancies. The data is beginning to show a slight advantage for sprinklers oriented
parallel to the floor rather than parallel to the ceiling. The information should be incorporated into
the earliest possible edition of NFPA 13 and should not have to wait until 2022.
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Committee Statement
Committee
Statement:
A research program of the Fire Protection Research Foundation is currently looking at this
subject and should conclude before the end of this revision cycle. The information should be
incorporated into this edition of NFPA 13.
The committee needs further input as research data becomes available.
Response
Message:
Public Input No. 537-NFPA 13-2016 [New Section after 8.5.4.2]
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Committee Input No. 843-NFPA 13-2016 [ New Section after 8.12.5.2 ]
Incorporate the results of the Fire Protection Research Foundation project on obstructions for
ESFR sprinklers into the 2019 edition.
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Committee Statement
Committee
Statement:
The Fire Protection Research Foundation performed a project specifically on this subject. The
results should be incorporated into this edition of NFPA 13 and should not have to wait until 2022
to get into the standard.
Response
Message:
Public Input No. 538-NFPA 13-2016 [New Section after 8.12.5.2]
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Committee Input No. 705-NFPA 13-2016 [ Section No. 8.15.5 ]
8.15.5 Elevator Hoistways and , Machine Rooms, Machinery Spaces, Control Rooms and Control
Spaces .
8.15.5.1*
Sidewall spray sprinklers shall be installed at the bottom of each elevator hoistway not more than 2 ft
(600 mm) above the floor of the pit.
8.15.5.2
The sprinkler required at the bottom of the elevator hoistway by 8.15.5.1 shall not be required for enclosed,
noncombustible elevator shafts that do not contain combustible hydraulic fluids.
8.15.5.3
Automatic fire sprinklers shall not be required in elevator machine rooms, elevator machinery spaces,
control rooms, control spaces, or hoistways of traction electric elevators installed in accordance with the
applicable provisions in NFPA 101, or the applicable building code, where all of the following conditions are
met:
(1)
The elevator machine room, machinery space, control room, control space, or hoistway of traction
elevator is dedicated to elevator equipment only.
(2)
The elevator machine room, machine room, machinery space, control room, control space, or
hoistway of traction elevators are protected by smoke detectors, or other automatic fire detection,
installed in accordance with NFPA 72.
(3)
The elevator machinery space, control room, control space, or hoistway of traction electric elevators
is separated from the remainder of the building by walls and floor/ceiling or roof/ceiling assemblies
having a fire resistance rating of not less than that specified by the applicable building code.
(4)
No materials unrelated to elevator equipment are permitted to be stored in elevator machine rooms,
machinery spaces, control rooms, control spaces, or hoistways of traction electric elevators.
(5)
The elevator machinery is not of the hydraulic type.
8.15.5.4*
Automatic sprinklers in elevator machine rooms or at the tops of hoistways shall be of ordinary- or
intermediate-temperature rating.
8.15.5.5*
Upright, pendent, or sidewall spray sprinklers shall be installed at the top of elevator hoistways.
8.15.5.6
The sprinkler required at the top of the elevator hoistway by 8.15.5.5 shall not be required where the
hoistway for passenger elevators is noncombustible or limited-combustible and the car enclosure materials
meet the requirements of ASME A17.1, Safety Code for Elevators and Escalators.
8.15.5.7 Combustible Suspension in Elevators.
8.15.5.7.1
Sprinklers shall be installed at the top and bottom of elevator hoistways where elevators utilize combustible
suspension means such as noncircular elastomeric-coated or polyurethane-coated steel belts.
8.15.5.7.2
The sprinklers in the elevator hoistway shall not be required when the suspension means provide not less
than an FT-1 rating when tested to the vertical burn test requirements of UL 62, Flexible Cords and Cables,
and UL 1581, Reference Standard for Electrical Wires, Cables, and Flexible Cords.
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Submittal Date:
Thu Aug 11 16:50:44 EDT 2016
Committee Statement
Committee
Statement:
The title of this section indicates Elevator Hoistways and Machine Rooms; however this sections
includes other elevator associated areas which are not included in the title and could be provided
in completely separated areas outside the hoistway and machine rooms.
These additional areas/spaces are the elevator machinery spaces and the elevator control spaces
indicated within this section.
This language does apply to machinary spaces and therefore this change is appropriate.
The committee is looking for additional information from the public on what the unintended
consequences may be of eliminating sprinklers in certain elevator hoistways.
Public Input No. 216-NFPA 13-2016 [Section No. 8.15.5]
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Committee Input No. 923-NFPA 13-2016 [ Section No. 8.17.1.7 ]
8.17.1.7 Sprinkler Waterflow Alarm for In-Rack Sprinklers.
See Section C.4.
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Committee
Statement:
Needs to be a requirement when located in the main body of the standard. Presently
unenforceable text. This goes back to the 2007 edition.
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Committee Input No. 783-NFPA 13-2016 [ New Section after 12.1.2 ]
Revise NFPA 13 to take into account the information learned from the Fire Protection Research
Foundation project on slope ceilings and storage occupancies. Address discharge criteria for
sprinklers under sloped ceilings and orientation of the sprinkler with respect to the floor or ceiling.
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Tue Aug 16 13:59:38 EDT 2016
Committee Statement
Committee
Statement:
A comprehensive research program from the Fire Protection Research Foundation will yield
results before the end of this cycle of NFPA 13 and needs to be incorporated into the earliest
possible edition of the standard.
This is related to a FPRF project. Information should be preliminarily developed such that details
are not a complete surprise to the public during the SR.
Response
Message:
Public Input No. 536-NFPA 13-2016 [New Section after 12.1.2]
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Committee Input No. 745-NFPA 13-2016 [ Section No. A.8.16.4.3 ]
A.8.16.4.3
Protection should be provided in any area of a structure or building that poses a degree of hazard greater
than that normal to the general occupancy of the building or structure. These areas include areas for the
storage or use of combustibles or flammables; toxic, noxious, or corrosive materials; and heat-producing
appliances.
Where approved by the authority having jurisdiction, the internal surface of fire sprinkler piping systems
can be coated with a water resistant epoxy coating to prevent corrosion of metal pipes and the build- up of
sludge or debris from pipe corrosion that would retard proper water flow.
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Fri Aug 12 14:58:35 EDT 2016
Committee Statement
Committee
Statement:
Presently the standard is silent on the use of additives to improve the internal corrosion
resistance of pipe and build-up of sludge from pipe corrosion.
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Committee Input No. 804-NFPA 13-2016 [ New Section after E.7.2.1 ]
Add new Annex to include Test Report Task Group report for SD>
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Wed Aug 17 13:20:55 EDT 2016
Committee Statement
Committee
Statement:
A taks group has been established ot produce a document listing critical informaiton needed
from test labs for sprinklers.
Response
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