ASTM C361-22

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C361 −22
Standard Specification for
Reinforced Concrete Low-Head Pressure Pipe
This standard is issued under the fixed designation C361; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* Wrought, Special Quality, Mechanical Properties
A706/A706MSpecification for Deformed and Plain Low-
1.1 This specification covers reinforced concrete pipe in-
Alloy Steel Bars for Concrete Reinforcement
tended to be used for the construction of pressure pipelines
A1008/A1008MSpecification for Steel, Sheet, Cold-Rolled,
with low internal hydrostatic heads generally not exceeding
Carbon, Structural, High-Strength Low-Alloy, High-
125 ft.
StrengthLow-AlloywithImprovedFormability,Required
1.2 This specification is the inch-pound companion to
Hardness, Solution Hardened, and Bake Hardenable
Specification C361; therefore, no SI equivalents are presented
A1011/A1011MSpecification for Steel, Sheet and Strip,
in the specification.
Hot-Rolled, Carbon, Structural, High-Strength Low-
NOTE 1—Field tests on completed portions of the pipeline are not
Alloy, High-Strength Low-Alloy with Improved
coveredbythisspecificationforthemanufactureofthepipebutshouldbe
Formability, and Ultra-High Strength
included in specifications for pipe laying.
A1064/A1064MSpecification for Carbon-Steel Wire and
1.3 This international standard was developed in accor-
Welded Wire Reinforcement, Plain and Deformed, for
dance with internationally recognized principles on standard-
Concrete
ization established in the Decision on Principles for the
C31/C31MPractice for Making and Curing Concrete Test
Development of International Standards, Guides and Recom-
Specimens in the Field
mendations issued by the World Trade Organization Technical
C33/C33MSpecification for Concrete Aggregates
Barriers to Trade (TBT) Committee.
C39/C39MTest Method for Compressive Strength of Cylin-
drical Concrete Specimens
2. Referenced Documents
C150/C150MSpecification for Portland Cement
2.1 ASTM Standards:
C260/C260MSpecification for Air-Entraining Admixtures
A27/A27MSpecification for Steel Castings, Carbon, for
for Concrete
General Application
C309Specification for Liquid Membrane-Forming Com-
A36/A36MSpecification for Carbon Structural Steel
pounds for Curing Concrete
A283/A283MSpecification for Low and Intermediate Ten-
C497MTest Methods for Concrete Pipe, Concrete Box
sile Strength Carbon Steel Plates
Sections, Manhole Sections, or Tile (Metric)
A575 Specification for Steel Bars, Carbon, Merchant
C595/C595MSpecification for Blended Hydraulic Cements
Quality, M-Grades
C618Specification for Coal Fly Ash and Raw or Calcined
A576Specification for Steel Bars, Carbon, Hot-Wrought,
Natural Pozzolan for Use in Concrete
Special Quality
C655 Specification for Reinforced Concrete D-Load
A615/A615MSpecificationforDeformedandPlainCarbon-
Culvert, Storm Drain, and Sewer Pipe
Steel Bars for Concrete Reinforcement
C822Terminology Relating to Concrete Pipe and Related
A675/A675MSpecification for Steel Bars, Carbon, Hot-
Products
C1602/C1602MSpecification for Mixing Water Used in the
Production of Hydraulic Cement Concrete
This specification is under the jurisdiction of ASTM Committee C13 on
ConcretePipeandisthedirectresponsibilityofSubcommitteeC13.04onLowHead
C1619Specification for Elastomeric Seals for Joining Con-
Pressure Pipe.
crete Structures
Current edition approved Sept. 1, 2022. Published September 2022. Originally
D698Test Methods for Laboratory Compaction Character-
approved in 1955. Last previous edition approved in 2019 as C361–19a. DOI:
10.1520/C0361-22.
istics of Soil Using Standard Effort (12,400 ft-lbf/ft (600
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 3
kN-m/m ))
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
D4253Test Methods for Maximum Index Density and Unit
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Weight of Soils Using a Vibratory Table
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C361 − 22
D4254Test Methods for Minimum Index Density and Unit pozzolan cement, except that the pozzolan constituent in the
Weight of Soils and Calculation of Relative Density Type IP portland pozzolan cement shall not exceed 20% by
weight.
2.2 Other Standards:
ACI Code 318Standard Building Code Requirements for 6.2.2 Fly Ash or Pozzolan—Fly ash or pozzolan shall
Reinforced Concrete conform to the requirements of Specification C618.
AISI-C1012
6.2.3 Allowable Cementitious Materials—The combination
ASCE 15-93Standard Practice for Direct Design of Buried of cementitious materials used in the concrete shall be one of
Precast Concrete Pipe Using Standard Installations
the following:
(SIDD)
6.2.3.1 Portland cement only,
6.2.3.2 Portland blast furnace slag cement only, or
3. Terminology
6.2.3.3 Portland pozzolan cement only.
3.1 Definitions—Fordefinitionsoftermsrelatingtoconcrete
6.2.3.4 A combination of portland cement and fly ash or
pipe, see Terminology C822.
pozzolan, wherein the proportion of fly ash or pozzolan is
between 5 and 20% by weight of total cementitious material
4. Classification
(portland cement plus fly ash or pozzolan).
4.1 Pipe manufactured according to this specification shall
6.3 Aggregates—Aggregates shall conform to Specification
beforhydrostaticheadsof25,50,75,100,and125ftmeasured
C33/C33M, except that the requirements for grading are
to the centerline of the pipe. Designs are provided in Table 1
waived.
for the above hydrostatic heads combined with external load-
6.4 Admixtures—Admixtures, except for air-entraining
ings of 5, 10, 15, and 20 ft (designated A, B, C, and D in Table
agents, shall not be added to the concrete unless permitted by
1) of earth cover over the top of the pipe under specific
installation conditions. The specific installation conditions are the owner.At the option of the manufacturer, or if specified by
the owner, the concrete in precast concrete pipe placed by the
covered in Appendix X1.Where the hydrostatic head, external
loadings, and installation conditions vary from those given in cast-and-vibrated method shall contain an air-entraining agent
conforming to Specification C260/C260M. The amount of
Table1andAppendixX1,detaileddesigncalculationsshallbe
air-entraining agent used shall be such as will affect the
made. The design criteria for Table 1 are presented in Appen-
entrainment of not more than 3% air by volume of concrete as
dix X2.
discharged from the mixer.
5. Basis of Acceptance
6.5 Steel Reinforcement—Reinforcement shall consist of
5.1 Acceptability of the pipe in all diameters and classes
wire conforming to Specification A1064/A1064M, or of bars
shall be determined by the results of such material tests as are
of Grades 40 or 60 steel conforming to Specification A615/
required in 6.2 through 6.9 by crushing tests on cured concrete
A615M or of Grade 40 steel conforming to Specification
cylinders, by hydrostatic pressure tests on units of the pipe, by
A36/A36M, or Grade 60 steel conforming to Specification
joint leakage tests, and by inspection during or after manufac-
A706/A706M.
ture to determine whether the pipe conforms to this specifica-
6.6 Steel for Joint Rings:
tion as to design and freedom from defects.
6.6.1 Steel strips for bell rings less than ⁄4 in. thick shall
5.2 Age for Acceptance—Pipe shall be considered ready for
conform to Grade SS30 of Specification A1011/A1011M or
acceptance when they conform to the requirements, as indi-
Grade Designation 1012 of Specification A575. Steel that
cated by the specified tests.
meets the requirements of AISI-C1012 for chemical compo-
nentswillbeacceptableprovideditconformstoGradeSS30of
6. Materials
Specification A1011/A1011M in other respects.
6.1 Reinforced Concrete—The reinforced concrete shall
6.6.2 Steelplateforbellrings ⁄4in.ormoreinthicknessand
consist of portland cement, mineral aggregates, and water, in
special shapes for spigot joint rings shall conform to Specifi-
which steel has been embedded in such a manner that the steel
cation A36/A36M, or to Grade A of Specification A283/
and concrete act together. Fly ash or pozzolan is not prohibited
A283M, or to Grade Designation 1012 of Specification A576,
when used as a partial cement replacement; see 9.1.
or to Grade 50 of Specification A675/A675M. Steel that meets
6.2 Cementitious Materials: the requirements ofAISI-C1012 for chemical components will
beacceptableprovideditconformstoSpecificationA36/A36M
6.2.1 Cement:
6.2.1.1 Portland Cement—Portlandcementshallconformto or to Specification A283/A283M Min other respects.
the requirements of Specification C150/C150M.
6.7 Steel Castings for Fittings—Steel castings for fittings
6.2.1.2 Blended Hydraulic Cement—Blended cement shall
shall conform to Grade 70-36, Normalized, of Specification
conform to the requirements of Specification C595/C595M for
A27/A27M.
Type IS portland blast furnace slag cement orType IPportland
6.8 Steel Plates and Sheets for Specials and Fittings—
Steel plates for specials and fittings shall conform to Specifi-
Available fromAmerican Concrete Institute (ACI), P.O. Box 9094, Farmington
cation A36/A36M or to Grade B or C of Specification
Hills, MI 48333-9094, http://www.concrete.org.
A283/A283M or Grade SS30 or SS33 of Specification A1011/
Available from American Iron and Steel Institute (AISI), 1140 Connecticut
Ave., NW, Suite 705, Washington, DC 20036, http://www.steel.org. A1011M or Grade SS30 of Specification A1008/A1008M.
C361 − 22
TABLE 1 Design Requirements for Reinforced Concrete Low-Head Pressure Pipe [12 Through 144 in. Diameter], Concrete Design Strength 5000 psi except as noted, Steel
Reinforcement Yield Strength 40 000 psi
NOTE 1—See Appendix for specific installation conditions and design criteria conditions required in conjunction with the use of Table 1.
NOTE 2—Designations,A, B, C, and D, for class of pipe, denote 5, 10, 15, and 20 ft of earth cover over top of pipe. Figures 25, Figures 50, Figures 75, etc. for class of pipe, denote hydrostatic
pressure heads in feet measured to centerline of pipe.
NOTE 3—An “s” in place of a steel area indicates the pipe class is a special design requiring stirrup reinforcement. Stirrups may be eliminated by changing wall thickness, main reinforcement,
concrete strength, or a combination thereof.
NOTE 4—The boldfaced value denotes 6000 psi concrete strength required.
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 12 15 18 21 24 27
Dia, in.
Type of
Reinforce- Circular Circular Circular Elliptical Circular Elliptical Circular Elliptical Circular Elliptical
ment
Wall
1 1 3 3 1 1 5 1 1 1 5 1
Thickness, 2323 2 ⁄4 32 ⁄4 32 ⁄8 32 ⁄8 32 ⁄2 32 ⁄2 32 ⁄8 3 ⁄8 3 ⁄4 4 ⁄4 2 ⁄8 3 ⁄4
in.
Layers of
Reinforce- Single Single Single Single Single Single Single Single Single Single Single Single Single Single Single Single Single Single Inner Outer Inner Outer Single Single
ment
Class
A-25 0.07 0.06 0.09 0.08 0.12 0.10 0.12 0.12 0.15 0.13 0.15 0.14 0.18 0.17 0.18 0.17 0.22 0.20 0.14 0.09 0.11 0.07 0.22 0.17
B-25 0.10 0.08 0.14 0.11 0.18 0.15 0.18 0.15 0.23 0.20 0.23 0.20 0.29 0.25 0.29 0.25 0.35 0.30 0.21 0.13 0.16 0.10 0.35 0.21
C-25 0.13 0.10 0.20 0.15 0.25 0.20 0.25 0.20 0.33 0.27 0.33 0.27 0.41 0.35 0.41 0.35 0.50 0.42 0.28 0.17 0.21 0.12 0.50 0.28
D-25 0.17 0.13 0.26 0.18 0.33 0.26 0.33 0.26 0.43 0.34 0.43 0.34 0.55 0.45 0.55 0.45 0.68 0.55 0.36 0.21 0.26 0.14 0.68 0.36
A-50 0.10 0.10 0.13 0.13 0.16 0.15 0.25 0.25 0.20 0.18 0.29 0.29 0.24 0.22 0.33 0.33 0.28 0.26 0.18 0.14 0.15 0.12 0.37 0.37
B-50 0.13 0.11 0.18 0.15 0.23 0.20 0.25 0.25 0.29 0.25 0.29 0.29 0.35 0.31 0.35 0.33 0.41 0.37 0.25 0.18 0.20 0.14 0.41 0.37
C-50 0.16 0.13 0.23 0.18 0.30 0.25 0.30 0.25 0.38 0.32 0.38 0.32 0.47 0.41 0.47 0.41 0.56 0.49 0.33 0.21 0.25 0.16 0.56 0.37
D-50 0.20 0.15 0.29 0.22 0.37 0.30 0.37 0.30 0.48 0.40 0.48 0.40 0.60 0.51 0.60 0.51 0.74 0.62 0.40 0.25 0.30 0.19 0.74 0.40
A-75 0.16 0.16 0.20 0.20 0.24 0.24 0.28 0.28 0.33 0.33 0.37 0.37 0.23 0.19 0.20 0.16
B-75 0.16 0.16 0.22 0.20 0.27 0.24 0.34 0.30 0.41 0.37 0.48 0.44 0.30 0.22 0.25 0.18
C-75 0.19 0.16 0.27 0.22 0.34 0.29 0.43 0.37 0.53 0.46 0.63 0.55 0.37 0.26 0.30 0.21
D-75 0.23 0.18 0.33 0.26 0.42 0.34 0.53 0.45 0.66 0.57 0.81 0.68 0.45 0.30 0.35 0.23
A-100 0.23 0.23 0.29 0.29 0.35 0.35 0.40 0.40 0.46 0.46 0.52 0.52 0.28 0.24 0.28 0.24
B-100 0.23 0.23 0.29 0.29 0.35 0.35 0.40 0.40 0.46 0.46 0.55 0.52 0.35 0.27 0.29 0.23
C-100 0.23 0.23 0.31 0.29 0.39 0.35 0.48 0.42 0.58 0.52 0.70 0.62 0.42 0.31 0.34 0.25
D-100 0.26 0.23 0.37 0.29 0.46 0.39 0.58 0.50 0.72 0.62 0.87 0.75 0.49 0.34 0.39 0.27
A-125 0.31 0.31 0.39 0.39 0.46 0.46 0.54 0.54 0.62 0.62 0.69 0.69 0.37 0.32 0.37 0.32
B-125 0.31 0.31 0.39 0.39 0.46 0.46 0.54 0.54 0.62 0.62 0.69 0.69 0.39 0.32 0.38 0.31
C-125 0.31 0.31 0.39 0.39 0.46 0.46 0.54 0.54 0.64 0.62 0.76 0.69 0.46 0.35 0.39 0.30
D-125 0.31 0.31 0.40 0.39 0.51 0.46 0.64 0.55 0.78 0.68 0.94 0.81 0.54 0.39 0.43 0.31

C361 − 22
TABLE 1 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 30 33
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Elliptical
ment
Wall
3 1 1 1 3 3 1 7 1 1 3 3 7 3
Thickness, 2 ⁄4 3 ⁄8 3 ⁄4 3 ⁄2 4 ⁄4 2 ⁄4 3 ⁄2 2 ⁄8 3 ⁄8 3 ⁄4 3 ⁄4 4 ⁄4 2 ⁄8 3 ⁄4
in.
Layers of
Reinforce- Single Single Inner Outer Inner Outer Inner Outer Single Single Single Single Inner Outer Inner Outer Inner Outer Single Single
ment
Class
A-25 0.25 0.23 0.16 0.11 0.15 0.10 0.12 0.08 0.25 0.19 0.29 0.27 0.19 0.13 0.17 0.11 0.14 0.09 0.29 0.21
B-25 0.41 0.37 0.25 0.16 0.23 0.15 0.18 0.11 0.41 0.23 0.48 0.45 0.30 0.19 0.26 0.16 0.21 0.13 0.48 0.26
C-25 0.60 0.52 0.34 0.21 0.31 0.19 0.23 0.13 0.60 0.31 0.71 0.64 0.41 0.25 0.34 0.21 0.27 0.16 0.71 0.34
D-25 0.82 0.69 0.44 0.26 0.40 0.23 0.28 0.16 0.82 0.40 0.92 0.87 0.53 0.32 0.44 0.26 0.34 0.19 0.92 0.44
A-50 0.32 0.30 0.21 0.16 0.20 0.15 0.17 0.13 0.41 0.41 0.37 0.35 0.24 0.19 0.22 0.17 0.19 0.15 0.45 0.45
B-50 0.49 0.45 0.30 0.21 0.28 0.20 0.22 0.15 0.49 0.41 0.56 0.53 0.35 0.25 0.31 0.22 0.26 0.18 0.56 0.45
C-50 0.67 0.60 0.39 0.26 0.36 0.24 0.28 0.18 0.67 0.41 0.79 0.72 0.46 0.31 0.40 0.26 0.32 0.21 0.79 0.45
D-50 0.90 0.77 0.49 0.31 0.44 0.28 0.33 0.20 0.90 0.44 1.00 0.95 0.58 0.37 0.49 0.31 0.39 0.24 1.00 0.49
A-75 0.41 0.41 0.27 0.22 0.25 0.21 0.22 0.18 0.45 0.45 0.30 0.24 0.27 0.22 0.25 0.20
B-75 0.56 0.52 0.35 0.26 0.33 0.25 0.27 0.20 0.64 0.61 0.41 0.30 0.36 0.27 0.31 0.23
C-75 0.74 0.67 0.44 0.31 0.41 0.29 0.32 0.22 0.87 0.80 0.52 0.36 0.45 0.32 0.37 0.26
D-75 0.97 0.84 0.53 0.36 0.49 0.33 0.38 0.25 1.08 1.03 0.63 0.43 0.54 0.36 0.44 0.29
A-100 0.58 0.58 0.32 0.27 0.31 0.26 0.31 0.27 0.64 0.64 0.36 0.30 0.34 0.29 0.34 0.29
B-100 0.63 0.59 0.41 0.31 0.38 0.30 0.32 0.25 0.72 0.69 0.47 0.36 0.42 0.32 0.36 0.28
C-100 0.82 0.74 0.49 0.36 0.46 0.34 0.37 0.27 0.95 0.88 0.57 0.42 0.50 0.37 0.42 0.31
D-100 1.04 0.91 0.58 0.41 0.54 0.38 0.42 0.29 1.16 1.11 0.69 0.48 0.59 0.42 0.49 0.34
A-125 0.77 0.77 0.41 0.36 0.41 0.36 0.41 0.36 0.85 0.85 0.46 0.39 0.45 0.39 0.45 0.40
B-125 0.77 0.77 0.46 0.37 0.43 0.35 0.43 0.35 0.85 0.85 0.52 0.42 0.47 0.38 0.47 0.38
C-125 0.89 0.81 0.54 0.41 0.51 0.39 0.44 0.33 1.03 0.96 0.63 0.48 0.56 0.42 0.48 0.37
D-125 1.12 0.99 0.63 0.46 0.59 0.43 0.47 0.34 1.24 1.19 0.74 0.54 0.65 0.47 0.54 0.39

C361 − 22
TABLE 1 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 36 39 42
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Elliptical Circular Elliptical
ment
Wall
1 1 1 1 1 1 1 1 3 1 1 3 1
Thickness, 3 ⁄8 3 ⁄4 45 3 ⁄8 43 ⁄2 4 ⁄4 5 ⁄4 3 ⁄2 4 ⁄4 3 ⁄4 4 ⁄2 5 ⁄2 3 ⁄4 4 ⁄2
in.
Layers of
Reinforce- Single Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single
ment
Class
A-25 0.32 0.22 0.15 0.18 0.12 0.15 0.10 0.32 0.23 0.23 0.16 0.20 0.13 0.17 0.11 0.25 0.25 0.25 0.17 0.21 0.15 0.19 0.13 0.27 0.27
B-25 0.54 0.35 0.23 0.28 0.18 0.23 0.14 0.54 0.28 0.38 0.24 0.31 0.19 0.26 0.16 0.38 0.31 0.40 0.26 0.33 0.21 0.28 0.17 0.40 0.33
C-25 0.78 0.49 0.30 0.38 0.23 0.30 0.18 0.78 0.38 0.52 0.32 0.41 0.25 0.34 0.20 0.52 0.41 0.55 0.34 0.45 0.27 0.37 0.22 0.55 0.45
D-25 1.01 0.63 0.38 0.48 0.28 0.38 0.21 1.01 0.48 0.67 0.40 0.52 0.31 0.42 0.24 0.67 0.52 0.71 0.43 0.56 0.34 0.46 0.26 0.71 0.56
A-50 0.40 0.28 0.21 0.24 0.18 0.21 0.16 0.49 0.49 0.30 0.23 0.26 0.20 0.23 0.17 0.53 0.53 0.32 0.24 0.28 0.21 0.25 0.19 0.57 0.57
B-50 0.62 0.41 0.29 0.34 0.24 0.29 0.20 0.62 0.49 0.44 0.31 0.37 0.26 0.31 0.22 0.53 0.53 0.47 0.32 0.40 0.28 0.34 0.24 0.57 0.57
C-50 0.87 0.54 0.36 0.43 0.29 0.36 0.23 0.87 0.49 0.58 0.38 0.47 0.31 0.39 0.25 0.58 0.53 0.61 0.41 0.51 0.34 0.43 0.28 0.61 0.57
D-50 1.10 0.69 0.44 0.53 0.34 0.43 0.27 1.10 0.53 0.73 0.47 0.58 0.37 0.47 0.30 0.73 0.58 0.77 0.49 0.63 0.40 0.52 0.32 0.77 0.63
A-75 0.49 0.34 0.28 0.30 0.24 0.27 0.22 0.36 0.29 0.32 0.26 0.29 0.24 0.38 0.31 0.34 0.28 0.31 0.25
B-75 0.71 0.47 0.35 0.40 0.29 0.34 0.25 0.50 0.37 0.43 0.32 0.37 0.28 0.53 0.39 0.46 0.34 0.41 0.30
C-75 0.96 0.60 0.42 0.49 0.34 0.41 0.29 0.64 0.45 0.53 0.37 0.45 0.31 0.68 0.47 0.57 0.40 0.49 0.34
D-75 1.19 0.74 0.50 0.59 0.40 0.48 0.32 0.79 0.53 0.64 0.43 0.53 0.35 0.83 0.56 0.69 0.46 0.58 0.39
A-100 0.69 0.40 0.34 0.38 0.32 0.38 0.32 0.43 0.36 0.41 0.34 0.41 0.34 0.45 0.38 0.44 0.37 0.44 0.37
B-100 0.80 0.53 0.41 0.45 0.35 0.40 0.31 0.57 0.44 0.49 0.38 0.43 0.33 0.60 0.46 0.53 0.41 0.47 0.36
C-100 1.04 0.66 0.48 0.55 0.40 0.47 0.34 0.70 0.51 0.59 0.43 0.51 0.37 0.74 0.54 0.64 0.46 0.55 0.40
D-100 1.28 0.80 0.56 0.65 0.45 0.54 0.38 0.85 0.59 0.70 0.49 0.59 0.41 0.90 0.63 0.75 0.53 0.64 0.45
A-125 0.93 0.50 0.43 0.50 0.43 0.50 0.43 0.54 0.46 0.54 0.47 0.54 0.47 0.58 0.50 0.58 0.50 0.58 0.50
B-125 0.93 0.60 0.47 0.51 0.41 0.51 0.41 0.63 0.50 0.56 0.45 0.56 0.45 0.67 0.53 0.60 0.48 0.60 0.48
C-125 1.13 0.72 0.54 0.60 0.46 0.53 0.40 0.77 0.58 0.65 0.49 0.57 0.43 0.81 0.61 0.70 0.53 0.62 0.47
D-125 1.36 0.86 0.62 0.70 0.51 0.59 0.43 0.91 0.65 0.76 0.55 0.65 0.47 0.96 0.69 0.81 0.59 0.70 0.51

C361 − 22
TABLE 1 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 45 48 51
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Elliptical Circular Elliptical
ment
Wall
7 3 3 7 3 1 3 1 1 1 1 1
Thickness, 3 ⁄8 4 ⁄4 5 ⁄4 3 ⁄8 4 ⁄4 4 ⁄8 55 ⁄4 4 ⁄8 54 ⁄4 5 ⁄4 64 ⁄4 5 ⁄4
in.
Layers of
Reinforce- Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single
ment
Class
A-25 0.27 0.19 0.23 0.16 0.20 0.14 0.29 0.29 0.29 0.20 0.25 0.17 0.23 0.15 0.31 0.31 0.32 0.22 0.27 0.18 0.25 0.17 0.33 0.33
B-25 0.44 0.28 0.36 0.23 0.31 0.19 0.44 0.36 0.48 0.31 0.39 0.25 0.35 0.22 0.48 0.39 0.52 0.33 0.42 0.26 0.37 0.23 0.52 0.42
C-25 0.60 0.38 0.48 0.29 0.40 0.24 0.60 0.48 0.65 0.41 0.53 0.32 0.46 0.27 0.65 0.53 0.71 0.44 0.56 0.34 0.49 0.30 0.71 0.56
D-25 0.78 0.47 0.61 0.36 0.50 0.29 0.78 0.61 0.84 0.51 0.66 0.40 0.57 0.33 0.84 0.66 0.92 0.56 0.71 0.42 0.62 0.36 0.92 0.71
A-50 0.34 0.26 0.30 0.23 0.27 0.20 0.61 0.61 0.37 0.28 0.32 0.25 0.30 0.23 0.65 0.65 0.40 0.30 0.35 0.26 0.32 0.24 0.70 0.70
B-50 0.51 0.35 0.43 0.30 0.37 0.26 0.61 0.61 0.55 0.38 0.47 0.32 0.42 0.29 0.65 0.65 0.60 0.41 0.50 0.34 0.45 0.31 0.70 0.70
C-50 0.67 0.45 0.55 0.36 0.47 0.30 0.67 0.61 0.73 0.48 0.60 0.39 0.53 0.34 0.73 0.65 0.79 0.52 0.64 0.42 0.57 0.37 0.79 0.70
D-50 0.85 0.54 0.67 0.43 0.56 0.35 0.85 0.67 0.91 0.59 0.73 0.47 0.64 0.40 0.91 0.73 0.99 0.64 0.78 0.50 0.69 0.43 0.99 0.78
A-75 0.42 0.33 0.37 0.30 0.34 0.27 0.45 0.36 0.40 0.32 0.37 0.30 0.48 0.38 0.42 0.34 0.40 0.32
B-75 0.58 0.43 0.50 0.37 0.44 0.32 0.63 0.46 0.54 0.40 0.49 0.36 0.68 0.50 0.57 0.42 0.52 0.38
C-75 0.74 0.52 0.61 0.43 0.53 0.37 0.80 0.56 0.67 0.47 0.60 0.42 0.86 0.60 0.71 0.50 0.64 0.45
D-75 0.91 0.61 0.74 0.50 0.63 0.42 0.98 0.66 0.80 0.54 0.71 0.47 1.07 0.71 0.85 0.57 0.76 0.51
A-100 0.49 0.41 0.47 0.39 0.47 0.40 0.53 0.44 0.50 0.42 0.50 0.42 0.56 0.47 0.54 0.45 0.53 0.45
B-100 0.65 0.50 0.57 0.43 0.51 0.39 0.70 0.54 0.61 0.47 0.56 0.43 0.76 0.58 0.65 0.50 0.60 0.46
C-100 0.81 0.59 0.68 0.50 0.60 0.44 0.87 0.63 0.74 0.54 0.67 0.49 0.94 0.68 0.79 0.57 0.72 0.52
D-100 0.98 0.68 0.80 0.56 0.69 0.48 1.05 0.73 0.87 0.61 0.78 0.54 1.14 0.79 0.93 0.65 0.83 0.58
A-125 0.62 0.53 0.62 0.54 0.62 0.54 0.67 0.57 0.66 0.57 0.66 0.57 0.71 0.60 0.71 0.61 0.71 0.61
B-125 0.73 0.57 0.64 0.51 0.64 0.51 0.78 0.62 0.69 0.55 0.69 0.55 0.84 0.66 0.73 0.58 0.73 0.58
C-125 0.88 0.66 0.75 0.57 0.66 0.50 0.95 0.71 0.81 0.61 0.74 0.56 1.02 0.76 0.86 0.65 0.79 0.60
D-125 1.05 0.75 0.87 0.63 0.76 0.55 1.13 0.81 0.94 0.68 0.85 0.62 1.21 0.87 1.00 0.72 0.91 0.66

C361 − 22
TABLE 1 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 54 57 60
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Elliptical Circular Elliptical
ment
Wall
1 1 1 1 1 3 3 1 3 3 3
Thickness, 4 ⁄2 5 ⁄2 6 ⁄4 4 ⁄2 5 ⁄2 4 ⁄4 5 ⁄4 6 ⁄2 4 ⁄4 5 ⁄4 56 6 ⁄4 56
in.
Layers of
Reinforce- Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single
ment
Class
A-25 0.33 0.23 0.29 0.19 0.26 0.18 0.35 0.35 0.35 0.24 0.30 0.21 0.28 0.19 0.37 0.37 0.37 0.25 0.32 0.22 0.30 0.20 0.39 0.39
B-25 0.54 0.35 0.44 0.28 0.40 0.25 0.54 0.44 0.56 0.36 0.47 0.30 0.42 0.26 0.56 0.47 0.58 0.38 0.49 0.31 0.45 0.28 0.58 0.49
C-25 0.74 0.46 0.60 0.36 0.53 0.32 0.74 0.60 0.78 0.49 0.63 0.39 0.57 0.34 0.78 0.63 0.81 0.51 0.67 0.41 0.60 0.36 0.81 0.67
D-25 0.96 0.59 0.75 0.45 0.66 0.39 0.96 0.75 1.00 0.61 0.80 0.48 0.70 0.41 1.00 0.80 1.05 0.64 0.85 0.51 0.75 0.44 1.05 0.85
A-50 0.42 0.31 0.37 0.28 0.34 0.26 0.74 0.74 0.44 0.33 0.39 0.29 0.37 0.27 0.78 0.78 0.46 0.35 0.41 0.31 0.39 0.29 0.82 0.82
B-50 0.62 0.43 0.52 0.36 0.48 0.33 0.74 0.74 0.65 0.45 0.55 0.38 0.50 0.35 0.78 0.78 0.67 0.47 0.58 0.40 0.53 0.37 0.82 0.82
C-50 0.82 0.55 0.68 0.44 0.61 0.40 0.82 0.74 0.86 0.57 0.72 0.47 0.65 0.42 0.86 0.78 0.90 0.60 0.76 0.50 0.69 0.45 0.90 0.82
D-50 1.04 0.66 0.83 0.53 0.74 0.46 1.04 0.83 1.08 0.69 0.88 0.56 0.78 0.49 1.08 0.88 1.13 0.72 0.93 0.59 0.83 0.53 1.13 0.93
A-75 0.50 0.40 0.45 0.36 0.42 0.34 0.53 0.42 0.48 0.38 0.45 0.36 0.55 0.44 0.50 0.40 0.48 0.38
B-75 0.71 0.52 0.60 0.44 0.55 0.41 0.73 0.54 0.63 0.47 0.59 0.43 0.76 0.56 0.67 0.49 0.62 0.45
C-75 0.90 0.63 0.75 0.52 0.68 0.47 0.94 0.66 0.80 0.55 0.73 0.50 0.99 0.68 0.84 0.58 0.77 0.53
D-75 1.11 0.74 0.91 0.61 0.81 0.54 1.16 0.78 0.96 0.64 0.86 0.58 1.21 0.81 1.01 0.68 0.91 0.61
A-100 0.59 0.49 0.57 0.47 0.57 0.47 0.62 0.51 0.60 0.50 0.60 0.50 0.65 0.53 0.63 0.52 0.63 0.52
B-100 0.79 0.60 0.68 0.52 0.63 0.49 0.82 0.63 0.72 0.55 0.67 0.51 0.85 0.65 0.76 0.58 0.71 0.54
C-100 0.98 0.71 0.83 0.61 0.76 0.55 1.03 0.74 0.88 0.64 0.81 0.59 1.07 0.77 0.93 0.67 0.86 0.62
D-100 1.19 0.83 0.98 0.69 0.89 0.62 1.24 0.86 1.04 0.72 0.94 0.66 1.29 0.90 1.09 0.76 1.00 0.70
A-125 0.75 0.64 0.75 0.64 0.75 0.64 0.79 0.67 0.79 0.68 0.79 0.68 0.84 0.71 0.83 0.71 0.83 0.71
B-125 0.87 0.69 0.77 0.61 0.77 0.62 0.91 0.71 0.82 0.65 0.82 0.65 0.94 0.74 0.86 0.68 0.86 0.68
C-125 1.07 0.79 0.91 0.69 0.84 0.63 1.11 0.83 0.96 0.72 0.89 0.67 1.16 0.86 1.02 0.76 0.94 0.71
D-125 1.27 0.91 1.06 0.77 0.97 0.70 1.32 0.95 1.12 0.81 1.02 0.74 1.38 0.99 1.18 0.85 1.08 0.78

C361 − 22
TABLE 1 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 63 66 69
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Elliptical Circular Elliptical
ment
Wall
1 1 1 1 1 1 1 1 1 3 3 1 3 3
Thickness, 5 ⁄4 6 ⁄4 75 ⁄4 6 ⁄4 5 ⁄2 6 ⁄2 7 ⁄4 5 ⁄2 6 ⁄2 5 ⁄4 6 ⁄4 7 ⁄2 5 ⁄4 6 ⁄4
in.
Layers of
Reinforce- Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single
ment
Class
A-25 0.39 0.27 0.35 0.24 0.32 0.22 0.41 0.41 0.41 0.28 0.37 0.25 0.34 0.23 0.43 0.43 0.43 0.30 0.39 0.26 0.36 0.24 0.44 0.44
B-25 0.62 0.40 0.52 0.33 0.48 0.30 0.62 0.52 0.64 0.41 0.55 0.35 0.50 0.31 0.64 0.55 0.67 0.43 0.58 0.37 0.53 0.33 0.67 0.58
C-25 0.87 0.54 0.72 0.44 0.65 0.39 0.87 0.72 0.90 0.56 0.76 0.46 0.69 0.41 0.90 0.76 0.94 0.58 0.80 0.49 0.72 0.44 0.94 0.80
D-25 1.11 0.68 0.90 0.54 0.81 0.47 1.11 0.90 1.16 0.70 0.95 0.57 0.85 0.50 1.16 0.95 1.20 0.73 1.00 0.60 0.90 0.53 1.20 1.00
A-50 0.49 0.37 0.44 0.33 0.42 0.31 0.86 0.86 0.51 0.38 0.47 0.35 0.44 0.33 0.90 0.90 0.54 0.40 0.49 0.36 0.46 0.34 0.94 0.94
B-50 0.71 0.49 0.62 0.43 0.57 0.39 0.86 0.86 0.74 0.51 0.65 0.45 0.60 0.41 0.90 0.90 0.77 0.53 0.67 0.47 0.63 0.43 0.94 0.94
C-50 0.96 0.63 0.81 0.53 0.74 0.48 0.96 0.86 1.00 0.66 0.85 0.56 0.78 0.51 1.00 0.90 1.04 0.68 0.89 0.59 0.82 0.53 1.04 0.94
D-50 1.20 0.77 0.99 0.63 0.89 0.56 1.20 0.99 1.24 0.80 1.04 0.66 0.94 0.59 1.24 1.04 1.29 0.83 1.09 0.70 0.99 0.63 1.29 1.09
A-75 0.59 0.47 0.54 0.43 0.51 0.40 0.62 0.49 0.56 0.45 0.54 0.42 0.64 0.51 0.59 0.47 0.56 0.45
B-75 0.81 0.59 0.71 0.52 0.66 0.48 0.84 0.61 0.74 0.54 0.69 0.51 0.87 0.63 0.77 0.57 0.73 0.53
C-75 1.05 0.73 0.90 0.62 0.83 0.57 1.09 0.76 0.94 0.65 0.87 0.60 1.13 0.78 0.99 0.69 0.92 0.63
D-75 1.28 0.86 1.08 0.72 0.98 0.65 1.33 0.89 1.13 0.76 1.03 0.69 1.38 0.93 1.19 0.79 1.09 0.72
A-100 0.69 0.57 0.66 0.55 0.66 0.55 0.72 0.59 0.70 0.57 0.70 0.57 0.75 0.61 0.73 0.60 0.73 0.60
B-100 0.90 0.69 0.80 0.61 0.75 0.58 0.94 0.71 0.84 0.64 0.79 0.60 0.97 0.74 0.88 0.67 0.82 0.63
C-100 1.14 0.82 0.99 0.72 0.92 0.66 1.19 0.85 1.04 0.75 0.96 0.70 1.23 0.89 1.09 0.78 1.01 0.73
D-100 1.37 0.95 1.17 0.81 1.07 0.74 1.42 0.99 1.22 0.85 1.12 0.78 1.48 1.02 1.28 0.89 1.18 0.82
A-125 0.88 0.74 0.88 0.74 0.88 0.74 0.92 0.78 0.92 0.78 0.92 0.78 0.96 0.81 0.96 0.81 0.96 0.81
B-125 1.00 0.78 0.90 0.72 0.90 0.72 1.04 0.81 0.95 0.75 0.95 0.75 1.07 0.84 0.99 0.78 0.99 0.78
C-125 1.23 0.92 1.08 0.81 1.01 0.75 1.28 0.95 1.13 0.85 1.06 0.79 1.33 0.99 1.19 0.89 1.11 0.83
D-125 1.46 1.04 1.26 0.90 1.16 0.83 1.52 1.08 1.32 0.95 1.22 0.88 1.57 1.12 1.38 0.99 1.28 0.92

C361 − 22
TABLE 1 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 72 78 84
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Circular
ment
Wall
3 1 1 1 3
Thickness, 67 7 ⁄4 67 6 ⁄2 7 ⁄2 8 ⁄4 78 8 ⁄4
in.
Layers of
Reinforce- Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Inner Outer Inner Outer Inner Outer
ment
Class
A-25 0.48 0.33 0.43 0.29 0.40 0.27 0.48 0.46 0.52 0.35 0.47 0.32 0.44 0.30 0.57 0.38 0.52 0.35 0.49 0.33
B-25 0.73 0.47 0.63 0.40 0.58 0.36 0.73 0.63 0.79 0.50 0.69 0.44 0.63 0.40 0.84 0.54 0.74 0.47 0.69 0.43
C-25 1.05 0.65 0.88 0.54 0.80 0.48 1.05 0.88 1.12 0.69 0.96 0.58 0.87 0.53 1.18 0.73 1.02 0.63 0.94 0.57
D-25 1.34 0.81 1.10 0.66 0.99 0.58 1.34 1.10 1.43 0.87 1.20 0.72 1.09 0.64 1.49 0.91 1.30 0.78 1.19 0.70
A-50 0.60 0.44 0.54 0.40 0.51 0.38 0.98 0.98 0.65 0.48 0.59 0.44 0.56 0.41 0.70 0.51 0.64 0.47 0.61 0.45
B-50 0.84 0.58 0.74 0.51 0.68 0.47 0.98 0.98 0.90 0.62 0.80 0.55 0.75 0.51 0.96 0.66 0.87 0.59 0.81 0.56
C-50 1.15 0.76 0.98 0.64 0.90 0.59 1.15 0.98 1.23 0.81 1.07 0.70 0.98 0.64 1.30 0.85 1.14 0.75 1.06 0.69
D-50 1.44 0.92 1.21 0.77 1.09 0.69 1.44 1.21 1.53 0.98 1.31 0.83 1.20 0.75 1.61 1.03 1.42 0.90 1.30 0.82
A-75 0.71 0.56 0.65 0.51 0.62 0.49 0.77 0.60 0.71 0.55 0.68 0.53 0.82 0.64 0.77 0.60 0.74 0.57
B-75 0.95 0.70 0.85 0.62 0.79 0.58 1.02 0.74 0.92 0.67 0.86 0.63 1.09 0.79 0.99 0.72 0.93 0.68
C-75 1.26 0.87 1.09 0.75 1.00 0.69 1.34 0.92 1.18 0.81 1.09 0.75 1.42 0.98 1.26 0.87 1.17 0.81
D-75 1.54 1.02 1.31 0.87 1.19 0.79 1.64 1.09 1.42 0.94 1.30 0.87 1.72 1.15 1.53 1.02 1.42 0.94
A-100 0.82 0.67 0.76 0.62 0.76 0.62 0.89 0.72 0.83 0.67 0.83 0.67 0.95 0.77 0.89 0.73 0.89 0.72
B-100 1.07 0.81 0.96 0.73 0.90 0.69 1.14 0.86 1.03 0.79 0.98 0.74 1.21 0.92 1.11 0.84 1.06 0.80
C-100 1.36 0.98 1.19 0.86 1.11 0.80 1.46 1.04 1.29 0.93 1.20 0.86 1.54 1.10 1.38 0.99 1.29 0.93
D-100 1.64 1.13 1.41 0.98 1.29 0.90 1.75 1.21 1.53 1.06 1.41 0.98 1.84 1.27 1.65 1.14 1.53 1.06
A-125 1.01 0.85 1.01 0.85 1.00 0.85 1.09 0.91 1.09 0.92 1.09 0.92 1.18 0.98 1.18 0.98 1.18 0.98
B-125 1.18 0.92 1.07 0.84 1.03 0.82 1.26 0.98 1.15 0.90 1.12 0.88 1.34 1.05 1.24 0.97 1.21 0.95
C-125 1.47 1.09 1.30 0.97 1.21 0.90 1.57 1.16 1.40 1.04 1.31 0.98 1.66 1.23 1.50 1.11 1.41 1.05
D-125 1.74 1.24 1.51 1.08 1.40 1.00 1.86 1.32 1.64 1.17 1.52 1.09 1.96 1.40 1.76 1.26 1.65 1.18

C361 − 22
TABLE 1 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 90 96 102 108 120 132 144
Dia, in.
Type of
Reinforce- Circular Circular Circular Circular Circular Circular Circular
ment
Wall
1 1 1 1
Thickness, 7 ⁄2 88 8 ⁄2 8 ⁄2 99 9 ⁄2 10 11 12
in.
Layers of
Reinforce- Inner Outer Inner Outer Inner Outer Inner Outer Inner Outer Inner Outer Inner Outer Inner Outer Inner Outer Inner Outer Inner Outer
ment
Class
A-25 0.62 0.41 0.59 0.39 0.67 0.45 0.64 0.43 0.72 0.48 0.69 0.46 0.77 0.51 0.75 0.49 0.89 0.58 1.01 0.66 1.14 0.74
B-25 0.90 0.57 0.85 0.54 0.96 0.61 0.91 0.58 1.02 0.65 0.97 0.62 1.08 0.69 1.04 0.66 1.22 0.77 1.36 0.86 1.52 0.96
C-25 1.25 0.77 1.16 0.72 1.31 0.81 1.23 0.76 1.39 0.86 1.31 0.81 1.46 0.90 1.38 0.85 1.62 1.00 1.78 1.10 1.96 1.21
D-25 1.59 0.97 1.50 0.91 1.69 1.03 1.61 0.97 1.79 1.09 1.69 1.02 1.88 1.15 1.77 1.07 SSSSSS
A-50 0.75 0.55 0.72 0.53 0.81 0.59 0.78 0.57 0.87 0.63 0.84 0.61 0.93 0.67 0.90 0.65 1.06 0.76 1.19 0.85 1.34 0.94
B-50 1.03 0.71 0.98 0.67 1.09 0.75 1.04 0.71 1.16 0.80 1.11 0.76 1.23 0.84 1.18 0.81 1.38 0.94 1.54 1.04 1.71 1.15
C-50 1.37 0.90 1.29 0.85 1.44 0.95 1.36 0.90 1.52 1.00 1.45 0.95 1.60 1.05 1.53 1.00 1.77 1.16 1.95 1.28 2.14 1.40
D-50 1.71 1.10 1.62 1.03 1.82 1.16 1.73 1.10 1.93 1.23 1.82 1.16 2.02 1.29 1.91 1.22 SSSSSS
A-75 0.89 0.69 0.86 0.66 0.95 0.73 0.92 0.71 1.02 0.78 0.99 0.76 1.08 0.83 1.06 0.81 1.23 0.93 1.38 1.03 1.54 1.14
B-75 1.16 0.84 1.11 0.80 1.23 0.89 1.18 0.85 1.31 0.94 1.26 0.91 1.38 1.00 1.34 0.96 1.55 1.11 1.72 1.23 1.90 1.35
C-75 1.49 1.03 1.41 0.97 1.58 1.09 1.50 1.03 1.66 1.14 1.58 1.09 1.75 1.20 1.67 1.15 1.93 1.33 2.12 1.46 2.33 1.59
D-75 1.83 1.22 1.74 1.16 1.95 1.30 1.86 1.24 2.06 1.37 1.96 1.30 2.16 1.44 2.06 1.37 SSSSSS
A-100 1.02 0.82 0.99 0.80 1.09 0.88 1.06 0.85 1.17 0.93 1.14 0.91 1.24 0.99 1.21 0.96 1.40 1.10 1.56 1.22 1.74 1.35
B-100 1.29 0.97 1.24 0.94 1.37 1.03 1.32 1.00 1.45 1.09 1.40 1.06 1.54 1.15 1.49 1.12 1.71 1.28 1.90 1.41 2.09 1.55
C-100 1.62 1.16 1.54 1.10 1.71 1.22 1.63 1.17 1.80 1.29 1.72 1.24 1.90 1.36 1.82 1.30 2.09 1.49 2.30 1.64 2.51 1.79
D-100 1.96 1.35 1.86 1.29 2.08 1.43 1.99 1.37 2.20 1.52 2.09 1.45 2.30 1.59 2.20 1.52 SSSSSS
A-125 1.27 1.05 1.26 1.05 1.35 1.12 1.35 1.12 1.44 1.18 1.44 1.18 1.53 1.25 1.53 1.25 1.70 1.38 1.88 1.52 2.06 1.65
B-125 1.42 1.11 1.37 1.07 1.51 1.17 1.46 1.14 1.60 1.24 1.55 1.20 1.69 1.31 1.64 1.27 1.88 1.45 2.08 1.60 2.29 1.75
C-125 1.75 1.29 1.67 1.24 1.84 1.36 1.77 1.31 1.94 1.44 1.87 1.38 2.04 1.51 1.97 1.46 2.25 1.66 2.47 1.82 2.70 1.98
D-125 2.08 1.48 1.99 1.41 2.21 1.57 2.27 1.50 2.34 1.66 2.23 1.59 2.45 1.74 2.35 1.67 SSSSSS

C361 − 22
TABLE 2 Design Requirements for Reinforced Concrete Low-Head Pressure Pipe [12 Through 144 in. Diameter], Concrete Design Strength 5000 psi except as noted, Steel
Reinforcement Yield Strength 60 000 psi
NOTE 1—See Appendix for specific installation conditions and design criteria conditions required in conjunction with the use of Table 2.
NOTE 2—Designations,A, B, C, and D, for class of pipe, denote 5, 10, 15, and 20 ft of earth cover over top of pipe. Figures 25, Figures 50, Figures 75, etc. for class of pipe, denote hydrostatic
pressure heads in feet measured to centerline of pipe.
NOTE 3—An “s” in place of a steel area indicates the pipe class is a special design requiring stirrup reinforcement. Stirrups may be eliminated by changing wall thickness, main reinforcement,
concrete strength, or a combination thereof.
NOTE 4—The boldfaced value denotes 6000 psi concrete strength required.
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 12 15 18 21 24 27
Dia, in.
Type of
Reinforce- Circular Circular Circular Elliptical Circular Elliptical Circular Elliptical Circular Elliptical
ment
Wall
1 1 3 3 1 1 5 1 1 1 5 1
Thickness, 2323 2 ⁄4 32 ⁄4 32 ⁄8 32 ⁄8 32 ⁄2 32 ⁄2 32 ⁄8 3 ⁄8 3 ⁄4 4 ⁄4 2 ⁄8 3 ⁄4
in.
Layers of
Reinforce- Single Single Single Single Single Single Single Single Single Single Single Single Single Single Single Single Single Single Inner Outer Inner Outer Single Single
ment
Class
A-25 0.05 0.05 0.06 0.06 0.08 0.07 0.12 0.12 0.10 0.09 0.14 0.14 0.12 0.11 0.15 0.15 0.14 0.13 0.09 0.06 0.07 0.05 0.17 0.17
B-25 0.07 0.05 0.10 0.08 0.12 0.10 0.12 0.12 0.16 0.13 0.16 0.14 0.19 0.17 0.19 0.17 0.23 0.20 0.14 0.09 0.11 0.07 0.23 0.17
C-25 0.09 0.07 0.13 0.10 0.17 0.14 0.17 0.14 0.22 0.18 0.22 0.18 0.27 0.23 0.27 0.23 0.33 0.28 0.19 0.11 0.14 0.08 0.33 0.19
D-25 0.11 0.08 0.17 0.12 0.22 0.17 0.22 0.17 0.29 0.23 0.29 0.23 0.36 0.30 0.36 0.30 0.45 0.37 0.24 0.14 0.18 0.10 0.45 0.24
A-50 0.10 0.10 0.13 0.13 0.15 0.15 0.25 0.25 0.18 0.18 0.29 0.29 0.20 0.20 0.33 0.33 0.23 0.23 0.13 0.10 0.13 0.10 0.37 0.37
B-50 0.10 0.10 0.13 0.13 0.15 0.15 0.25 0.25 0.19 0.18 0.29 0.29 0.23 0.21 0.33 0.33 0.28 0.25 0.17 0.12 0.14 0.09 0.37 0.37
C-50 0.11 0.10 0.16 0.13 0.20 0.17 0.25 0.25 0.25 0.21 0.29 0.29 0.31 0.27 0.33 0.33 0.38 0.32 0.22 0.14 0.17 0.11 0.38 0.37
D-50 0.13 0.10 0.20 0.15 0.25 0.20 0.25 0.25 0.32 0.26 0.32 0.29 0.40 0.34 0.40 0.34 0.49 0.41 0.27 0.17 0.20 0.12 0.49 0.37
A-75 0.16 0.16 0.20 0.20 0.24 0.24 0.28 0.28 0.33 0.33 0.37 0.37 0.20 0.16 0.20 0.16
B-75 0.16 0.16 0.20 0.20 0.24 0.24 0.28 0.28 0.33 0.33 0.37 0.37 0.21 0.16 0.21 0.16
C-75 0.16 0.16 0.20 0.20 0.24 0.24 0.29 0.28 0.35 0.33 0.42 0.37 0.25 0.17 0.22 0.15
D-75 0.16 0.16 0.22 0.20 0.28 0.24 0.36 0.30 0.44 0.38 0.54 0.45 0.30 0.20 0.23 0.15
A-100 0.23 0.23 0.29 0.29 0.35 0.35 0.40 0.40 0.46 0.46 0.52 0.52 0.28 0.24 0.28 0.24
B-100 0.23 0.23 0.29 0.29 0.35 0.35 0.40 0.40 0.46 0.46 0.52 0.52 0.29 0.23 0.29 0.23
C-100 0.23 0.23 0.29 0.29 0.35 0.35 0.40 0.40 0.46 0.46 0.52 0.52 0.30 0.22 0.30 0.22
D-100 0.23 0.23 0.29 0.29 0.35 0.35 0.40 0.40 0.48 0.46 0.58 0.52 0.33 0.23 0.31 0.21
A-125 0.31 0.31 0.39 0.39 0.46 0.46 0.54 0.54 0.62 0.62 0.69 0.69 0.37 0.32 0.37 0.32
B-125 0.31 0.31 0.39 0.39 0.46 0.46 0.54 0.54 0.62 0.62 0.69 0.69 0.38 0.31 0.38 0.31
C-125 0.31 0.31 0.39 0.39 0.46 0.46 0.54 0.54 0.62 0.62 0.69 0.69 0.39 0.30 0.39 0.30
D-125 0.31 0.31 0.39 0.39 0.46 0.46 0.54 0.54 0.62 0.62 0.69 0.69 0.40 0.29 0.40 0.29

C361 − 22
TABLE 2 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 30 33
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Elliptical
ment
Wall
3 1 1 1 3 3 1 7 1 1 3 3 7 3
Thickness, 2 ⁄4 3 ⁄8 3 ⁄4 3 ⁄2 4 ⁄4 2 ⁄4 3 ⁄2 2 ⁄8 3 ⁄8 3 ⁄4 3 ⁄4 4 ⁄4 2 ⁄8 3 ⁄4
in.
Layers of
Reinforce- Single Single Inner Outer Inner Outer Inner Outer Single Single Single Single Inner Outer Inner Outer Inner Outer Single Single
ment
Class
A-25 0.17 0.15 0.11 0.07 0.10 0.07 0.08 0.05 0.19 0.19 0.19 0.18 0.13 0.09 0.11 0.08 0.09 0.06 0.21 0.21
B-25 0.28 0.25 0.17 0.11 0.15 0.10 0.12 0.07 0.28 0.19 0.32 0.30 0.20 0.13 0.17 0.11 0.14 0.08 0.32 0.21
C-25 0.40 0.35 0.23 0.14 0.21 0.13 0.15 0.09 0.40 0.21 0.47 0.43 0.27 0.17 0.23 0.14 0.18 0.11 0.47 0.23
D-25 0.55 0.46 0.29 0.17 0.26 0.15 0.19 0.10 0.55 0.26 0.61 0.58 0.35 0.21 0.29 0.17 0.23 0.13 0.61 0.29
A-50 0.26 0.26 0.14 0.11 0.14 0.11 0.14 0.11 0.41 0.41 0.28 0.28 0.16 0.12 0.16 0.12 0.16 0.12 0.45 0.45
B-50 0.32 0.30 0.20 0.14 0.19 0.13 0.15 0.10 0.41 0.41 0.38 0.35 0.24 0.16 0.21 0.14 0.17 0.12 0.45 0.45
C-50 0.45 0.40 0.26 0.17 0.24 0.16 0.18 0.12 0.45 0.41 0.52 0.48 0.31 0.20 0.27 0.17 0.21 0.14 0.52 0.45
D-50 0.60 0.51 0.32 0.21 0.30 0.19 0.22 0.13 0.60 0.41 0.66 0.64 0.39 0.25 0.33 0.21 0.26 0.16 0.66 0.45
A-75 0.41 0.41 0.22 0.18 0.22 0.18 0.22 0.18 0.45 0.45 0.25 0.20 0.25 0.20 0.25 0.20
B-75 0.41 0.41 0.24 0.18 0.23 0.17 0.23 0.17 0.45 0.45 0.27 0.20 0.26 0.19 0.26 0.19
C-75 0.50 0.45 0.29 0.21 0.27 0.19 0.24 0.17 0.58 0.53 0.35 0.24 0.30 0.21 0.26 0.18
D-75 0.65 0.56 0.36 0.24 0.33 0.22 0.25 0.16 0.72 0.69 0.42 0.28 0.36 0.24 0.29 0.19
A-100 0.58 0.58 0.31 0.26 0.31 0.26 0.31 0.27 0.64 0.64 0.34 0.29 0.34 0.29 0.34 0.29
B-100 0.58 0.58 0.32 0.25 0.32 0.25 0.32 0.25 0.64 0.64 0.36 0.28 0.36 0.28 0.36 0.28
C-100 0.58 0.58 0.33 0.24 0.33 0.24 0.33 0.24 0.64 0.64 0.38 0.28 0.37 0.27 0.37 0.27
D-100 0.70 0.61 0.39 0.27 0.36 0.25 0.34 0.24 0.77 0.74 0.46 0.32 0.40 0.28 0.37 0.26
A-125 0.77 0.77 0.41 0.36 0.41 0.36 0.41 0.36 0.85 0.85 0.46 0.39 0.45 0.39 0.45 0.40
B-125 0.77 0.77 0.43 0.34 0.43 0.34 0.43 0.35 0.85 0.85 0.47 0.38 0.47 0.38 0.47 0.38
C-125 0.77 0.77 0.44 0.33 0.44 0.33 0.44 0.33 0.85 0.85 0.48 0.37 0.48 0.37 0.48 0.37
D-125 0.80 0.77 0.45 0.32 0.45 0.33 0.45 0.32 0.85 0.85 0.49 0.36 0.49 0.36 0.49 0.36

C361 − 22
TABLE 2 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 36 39 42
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Elliptical Circular Elliptical
ment
Wall
1 1 1 1 1 1 1 1 3 1 1 3 1
Thickness, 3 ⁄8 3 ⁄4 45 3 ⁄8 43 ⁄2 4 ⁄4 5 ⁄4 3 ⁄2 4 ⁄4 3 ⁄4 4 ⁄2 5 ⁄2 3 ⁄4 4 ⁄2
in.
Layers of
Reinforce- Single Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single
ment
Class
A-25 0.21 0.14 0.10 0.12 0.08 0.10 0.07 0.23 0.23 0.15 0.11 0.13 0.09 0.11 0.08 0.25 0.25 0.16 0.11 0.14 0.10 0.12 0.08 0.27 0.27
B-25 0.36 0.23 0.15 0.19 0.12 0.15 0.09 0.36 0.23 0.25 0.16 0.20 0.13 0.17 0.10 0.25 0.25 0.27 0.17 0.22 0.14 0.19 0.12 0.27 0.27
C-25 0.52 0.32 0.20 0.25 0.15 0.20 0.12 0.52 0.25 0.34 0.21 0.27 0.17 0.22 0.13 0.34 0.27 0.37 0.23 0.30 0.18 0.25 0.14 0.37 0.30
D-25 0.68 0.42 0.25 0.32 0.19 0.25 0.14 0.68 0.32 0.45 0.27 0.35 0.21 0.28 0.16 0.45 0.35 0.47 0.29 0.38 0.22 0.31 0.17 0.47 0.38
A-50 0.31 0.19 0.14 0.17 0.13 0.17 0.13 0.49 0.49 0.20 0.15 0.19 0.14 0.19 0.14 0.53 0.53 0.21 0.16 0.20 0.15 0.20 0.15 0.57 0.57
B-50 0.42 0.27 0.19 0.23 0.16 0.19 0.13 0.49 0.49 0.29 0.20 0.25 0.17 0.21 0.14 0.53 0.53 0.31 0.22 0.27 0.18 0.23 0.16 0.57 0.57
C-50 0.58 0.36 0.24 0.29 0.19 0.24 0.15 0.58 0.49 0.39 0.26 0.31 0.21 0.26 0.17 0.53 0.53 0.41 0.27 0.34 0.22 0.29 0.19 0.57 0.57
D-50 0.73 0.46 0.29 0.36 0.23 0.29 0.18 0.73 0.49 0.49 0.31 0.39 0.25 0.32 0.20 0.53 0.53 0.51 0.33 0.42 0.27 0.35 0.22 0.57 0.57
A-75 0.49 0.27 0.22 0.27 0.22 0.27 0.22 0.29 0.24 0.29 0.24 0.29 0.24 0.32 0.25 0.31 0.25 0.31 0.25
B-75 0.49 0.32 0.23 0.28 0.21 0.28 0.21 0.34 0.25 0.30 0.22 0.30 0.22 0.36 0.26 0.33 0.24 0.33 0.24
C-75 0.64 0.40 0.28 0.33 0.23 0.29 0.20 0.43 0.30 0.35 0.25 0.31 0.22 0.45 0.32 0.38 0.27 0.34 0.23
D-75 0.79 0.50 0.33 0.39 0.26 0.32 0.21 0.53 0.35 0.43 0.29 0.35 0.24 0.56 0.37 0.46 0.31 0.39 0.26
A-100 0.69 0.38 0.32 0.38 0.32 0.38 0.32 0.41 0.34 0.41 0.34 0.41 0.34 0.44 0.37 0.44 0.37 0.44 0.37
B-100 0.69 0.39 0.30 0.39 0.30 0.39 0.30 0.42 0.33 0.42 0.33 0.42 0.33 0.46 0.35 0.46 0.35 0.46 0.35
C-100 0.70 0.44 0.32 0.40 0.29 0.40 0.29 0.47 0.34 0.43 0.32 0.43 0.32 0.50 0.36 0.47 0.34 0.47 0.34
D-100 0.85 0.53 0.37 0.43 0.30 0.41 0.28 0.57 0.39 0.47 0.33 0.44 0.31 0.60 0.42 0.50 0.35 0.48 0.33
A-125 0.93 0.50 0.43 0.50 0.43 0.50 0.43 0.54 0.46 0.54 0.47 0.54 0.47 0.58 0.50 0.58 0.50 0.58 0.50
B-125 0.93 0.52 0.41 0.51 0.41 0.51 0.41 0.56 0.44 0.56 0.45 0.56 0.45 0.60 0.48 0.60 0.48 0.60 0.48
C-125 0.93 0.53 0.40 0.53 0.40 0.53 0.40 0.57 0.43 0.57 0.43 0.57 0.43 0.62 0.46 0.62 0.47 0.61 0.47
D-125 0.93 0.57 0.41 0.54 0.39 0.54 0.39 0.61 0.44 0.58 0.42 0.58 0.42 0.64 0.46 0.63 0.45 0.63 0.45

C361 − 22
TABLE 2 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 45 48 51
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Elliptical Circular Elliptical
ment
Wall
7 3 3 7 3 1 3 1 1 1 1 1
Thickness, 3 ⁄8 4 ⁄4 5 ⁄4 3 ⁄8 4 ⁄4 4 ⁄8 55 ⁄4 4 ⁄8 54 ⁄4 5 ⁄4 64 ⁄4 5 ⁄4
in.
Layers of
Reinforce- Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single
ment
Class
A-25 0.18 0.12 0.15 0.10 0.13 0.09 0.29 0.29 0.19 0.13 0.17 0.11 0.15 0.10 0.31 0.31 0.21 0.14 0.18 0.12 0.16 0.11 0.33 0.33
B-25 0.29 0.19 0.24 0.15 0.20 0.13 0.29 0.29 0.32 0.20 0.26 0.17 0.23 0.14 0.32 0.31 0.35 0.22 0.28 0.18 0.25 0.15 0.35 0.33
C-25 0.40 0.25 0.32 0.20 0.27 0.16 0.40 0.32 0.44 0.27 0.35 0.21 0.31 0.18 0.44 0.35 0.47 0.30 0.37 0.23 0.33 0.20 0.47 0.37
D-25 0.52 0.32 0.41 0.24 0.33 0.19 0.52 0.41 0.56 0.34 0.44 0.26 0.38 0.22 0.56 0.44 0.61 0.37 0.47 0.28 0.41 0.24 0.61 0.47
A-50 0.23 0.17 0.22 0.17 0.22 0.17 0.61 0.61 0.25 0.19 0.23 0.18 0.23 0.18 0.65 0.65 0.27 0.20 0.25 0.19 0.25 0.19 0.70 0.70
B-50 0.34 0.24 0.29 0.20 0.25 0.17 0.61 0.61 0.37 0.26 0.31 0.21 0.28 0.19 0.65 0.65 0.40 0.28 0.33 0.23 0.30 0.21 0.70 0.70
C-50 0.45 0.30 0.37 0.24 0.31 0.20 0.61 0.61 0.48 0.32 0.40 0.26 0.35 0.23 0.65 0.65 0.52 0.35 0.42 0.28 0.38 0.25 0.70 0.70
D-50 0.56 0.36 0.45 0.29 0.38 0.23 0.61 0.61 0.61 0.39 0.49 0.31 0.43 0.27 0.65 0.65 0.66 0.42 0.52 0.33 0.46 0.29 0.70 0.70
A-75 0.34 0.27 0.34 0.27 0.34 0.27 0.36 0.29 0.36 0.29 0.36 0.29 0.38 0.31 0.38 0.31 0.38 0.31
B-75 0.39 0.28 0.35 0.26 0.35 0.26 0.42 0.31 0.38 0.28 0.38 0.28 0.45 0.33 0.40 0.29 0.40 0.29
C-75 0.49 0.34 0.41 0.29 0.36 0.25 0.53 0.37 0.45 0.31 0.40 0.28 0.58 0.40 0.47 0.33 0.43 0.30
D-75 0.61 0.41 0.49 0.33 0.42 0.28 0.66 0.44 0.54 0.36 0.47 0.32 0.71 0.48 0.57 0.38 0.51 0.34
A-100 0.47 0.39 0.47 0.39 0.47 0.40 0.50 0.42 0.50 0.42 0.50 0.42 0.54 0.44 0.54 0.45 0.53 0.45
B-100 0.49 0.38 0.49 0.38 0.49 0.38 0.52 0.40 0.52 0.40 0.52 0.40 0.56 0.42 0.56 0.43 0.55 0.43
C-100 0.54 0.39 0.50 0.37 0.50 0.37 0.58 0.42 0.53 0.39 0.53 0.39 0.63 0.45 0.57 0.41 0.57 0.41
D-100 0.65 0.45 0.54 0.38 0.51 0.36 0.70 0.49 0.58 0.41 0.54 0.38 0.76 0.53 0.62 0.43 0.58 0.40
A-125 0.62 0.53 0.62 0.54 0.62 0.54 0.67 0.57 0.66 0.57 0.66 0.57 0.71 0.60 0.71 0.61 0.71 0.61
B-125 0.65 0.51 0.64 0.51 0.64 0.51 0.69 0.54 0.69 0.55 0.69 0.55 0.73 0.58 0.73 0.58 0.73 0.58
C-125 0.66 0.50 0.66 0.50 0.66 0.50 0.71 0.53 0.70 0.53 0.70 0.53 0.75 0.56 0.75 0.56 0.75 0.56
D-125 0.70 0.50 0.67 0.49 0.67 0.49 0.75 0.54 0.72 0.52 0.72 0.52 0.81 0.58 0.76 0.55 0.76 0.55

C361 − 22
TABLE 2 Continued
Circumferential reinforcement, in. /linear ft of pipe
Internal
Designated 54 57 60
Dia, in.
Type of
Reinforce- Circular Elliptical Circular Elliptical Circular Elliptical
ment
Wall
1 1 1 1 1 3 3 1 3 3 3
Thickness, 4 ⁄2 5 ⁄2 6 ⁄4 4 ⁄2 5 ⁄2 4 ⁄4 5 ⁄4 6 ⁄2 4 ⁄4 5 ⁄4 56 6 ⁄4 56
in.
Layers of
Reinforce- Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single Inner Outer Inner Outer Inner Outer Single Single
ment
Class
A-25 0.22 0.15 0.19 0.13 0.18 0.12 0.35 0.35 0.23 0.16 0.20 0.14 0.19 0.13 0.37 0.37 0.25 0.17 0.22 0.15 0.20 0.13 0.39 0.39
B-25 0.36 0.23 0.30 0.19 0.26 0.17 0.36 0.35 0.37 0.24 0.31 0.20 0.28 0.18 0.37 0.37 0.39 0.25 0.33 0.21 0.30 0.19 0.39 0.39
C-25 0.50 0.31 0.40 0.24 0.35 0.21 0.50 0.40 0.52 0.32 0.42 0.26 0.38 0.23 0.52 0.42 0.54 0.34 0.45 0.27 0.40 0.24 0.54 0.45
D-25 0.64 0.39 0.50 0.30 0.44 0.26 0.64 0.50 0.67 0.41 0.53 0.32 0.47 0.28 0.67 0.53 0.70 0.43 0.56 0.34 0.50 0.29 0.70 0.56
A-50 0.28 0.21 0.26 0.20 0.26 0.20 0.74 0.74 0.29 0.22 0.28 0.21 0.28 0.21 0.78 0.78 0.31 0.23 0.29 0.22 0.29 0.22 0.82 0.82
B-50 0.42 0.29 0.35 0.24 0.32 0.22 0.74 0.74 0.43 0.30 0.37 0.25 0.34 0.23 0.78 0.7
...