Designation: A 106 – 99e1 An American National Standard

Used in USDOE-NE standards

Standard Specification for

Seamless Carbon Steel Pipe for High-Temperature Service1
This standard is issued under the fixed designation A 106; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.

e1 NOTE—Values in 14.5.1were editorially corrected August 1999.

1. Scope test method portion, Sections 11, 12, 13, 14, and 15, of this
1.1 This specification2 covers seamless carbon steel pipe for specification: This standard does not purport to address all of
high-temperature service (Note 1) in NPS 1⁄8 to NPS 48 the safety concerns, if any, associated with its use. It is the
inclusive, with nominal (average) wall thickness as given in responsibility of the user of this standard to establish appro-
ANSI B 36.10. It shall be permissible to furnish pipe having priate safety and health practices and determine the applica-
other dimensions provided such pipe complies with all other bility of regulatory limitations prior to use.
requirements of this specification. Pipe ordered under this
specification shall be suitable for bending, flanging, and 2. Referenced Documents
similar forming operations, and for welding. When the steel is 2.1 ASTM Standards:
to be welded, it is presupposed that a welding procedure A 520 Specification for Supplementary Requirements for
suitable to the grade of steel and intended use or service will Seamless and Electric-Resistance-Welded Carbon Steel
be utilized (Note 2). Tubular Products for High-Temperature Service Conform-
ing to ISO Recommendations for Boiler Construction3
NOTE 1—It is suggested, consideration be given to possible graphitiza-
A 530/A 530M Specification for General Requirements for
tion.
NOTE 2—The purpose for which the pipe is to be used should be stated Specialized Carbon and Alloy Steel Pipe3
in the order. Grade A rather than Grade B or Grade C is the preferred E 213 Practice for Ultrasonic Examination of Metal Pipe
grade for close coiling or cold bending. This note is not intended to and Tubing4
prohibit the cold bending of Grade B seamless pipe. E 309 Practice for Eddy-Current Examination of Steel Tu-
1.2 Supplementary requirements (S1 to S7) of an optional bular Products Using Magnetic Saturation4
nature are provided for seamless pipe intended for use in E 381 Method of Macroetch Testing, Inspection, and
applications where a superior grade of pipe is required. These Rating Steel Products, Comprising Bars, Billets, Blooms,
supplementary requirements call for additional tests to be and Forgings5
made and when desired shall be so stated in the order. E 570 Practice for Flux Leakage Examination of Ferromag-
1.3 When these products are to be used in applications netic Steel Tubular Products4
conforming to ISO Recommendations for Boiler Construction, 2.2 ANSI Standard:
the requirements of Specification A 520 (Mechanical Property ANSI B 36.10 Welded and Seamless Wrought Steel Pipe6
Requirements Section) shall supplement and supersede the 2.3 Military Standards:
requirements of this specification. MIL-STD-129 Marking for Shipment and Storage7
1.4 The values stated in inch-pound units are to be regarded MIL-STD-163 Steel Mill Products, Preparation for Ship-
as the standard. ment and Storage7
2.4 Federal Standard:
NOTE 3—The dimensionless designator NPS (nominal pipe size) has Fed. Std. No. 123 Marking for Shipments (Civil Agencies)7
been substituted in this standard for such traditional terms as “nominal
diameter,” “size,” and “nominal size.”
Fed. Std. No. 183 Continuous Identification Marking of Iron
and Steel Products7
1.5 The following precautionary caveat pertains only to the 2.5 Other Standards:

1
This specification is under the jurisdiction of Committee A01 on Steel, 3
Annual Book of ASTM Standards, Vol 01.01.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee 4
Annual Book of ASTM Standards, Vol 03.03.
A01.09 on Carbon Steel Tubular Products. 5
Annual Book of ASTM Standards, Vol 03.01.
Current edition approved Mar. 10, 1999. Published May 1999. Originally 6
Available from American National Standards Institute, 11 West 42nd St., 13th
published as A 106 – 26 T. Last previous edition A 106 – 97a.
2 Floor, New York, NY 10036.
For ASME Boiler and Pressure Vessel Code applications see related Specifi- 7
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
cations SA-106 in Section II of that Code.
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.

Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.

1
 A 106
SSPC-SP 6 Surface Preparation Specification No. 68 producer shall remove the transition material by any estab-
lished procedure that positively separates the grades.
3. Ordering Information 4.3 For pipe NPS 11⁄2 and under, it shall be permissible to
3.1 The inclusion of the following, as required will describe furnish hot finished or cold drawn.
the desired material adequately, when ordered under this 4.4 Unless otherwise specified, pipe NPS 2 and over shall
specification: be furnished hot finished. When agreed upon between the
3.1.1 Quantity (feet or number of lengths), manu- facturer and the purchaser, it is permissible to furnish
3.1.2 Name of material (seamless carbon steel pipe), cold- drawn pipe.
3.1.3 Grade (Table 1),
5. Heat Treatment
3.1.4 Manufacture (hot-finished or cold-drawn),
3.1.5 Size (NPS and weight class or schedule number, or 5.1 Hot-finished pipe need not be heat treated. Cold-drawn
both; outside diameter and nominal wall thickness; or inside pipe shall be heat treated after the final cold draw pass at a
diameter and nominal wall thickness), temperature of 1200°F (650°C) or higher.
3.1.6 Special outside diameter tolerance pipe (16.2.2), 6. General Requirements
3.1.7 Inside diameter tolerance pipe, over 10 in. (254 mm)
6.1 Material furnished to this specification shall conform to
ID (16.2.3),
3.1.8 Length (specific or random, Section 20), the applicable requirements of the current edition of Specifi-
3.1.9 Optional requirements (Section 9 and S1 to S7), cation A 530/A 530M unless otherwise provided herein.
3.1.10 Test report required (Section on Certification of 7. Chemical Composition
Specification A 530/A 530M), 7.1 The steel shall conform to the requirements as to
3.1.11 Specification designation, chemical composition prescribed in Table 1.
3.1.12 End use of material,
3.1.13 Hydrostatic test in accordance with Specification 8. Heat Analysis
A 530/A 530M or 13.3 of this specification, or NDE in 8.1 An analysis of each heat of steel shall be made by the
accordance with Section 14 of this specification. steel manufacturer to determine the percentages of the ele-
3.1.14 Special requirements. ments specified in Section 7. If the secondary melting pro-
cesses of 5.1 are employed, the heat analysis shall be obtained
4. Process from one remelted ingot or the product of one remelted ingot
4.1 The steel shall be killed steel, with the primary melting of each primary melt. The chemical composition thus deter-
process being open-hearth, basic-oxygen, or electric-furnace, mined, or that determined from a product analysis made by the
possibly combined with separate degassing or refining. If manufacturer, if the latter has not manufactured the steel, shall
secondary melting, using electroslag remelting or vacuum-arc be reported to the purchaser or the purchaser’s representative,
remelting is subsequently employed, the heat shall be defined and shall conform to the requirements specified in Section 7.
as all of the ingots remelted from a single primary heat.
4.2 Steel cast in ingots or strand cast is permissible. When 9. Product Analysis
steels of different grades are sequentially strand cast, identifi- 9.1 At the request of the purchaser, analyses of two pipes
cation of the resultant transition material is required. The from each lot (Note 4) of 400 lengths or fraction thereof, of
each size up to, but not including, NPS 6, and from each lot of
200 lengths or fraction thereof of each size NPS 6 and over,
8
Available from Steel Structures Painting Council, 4400 5th Ave., Pittsburgh, shall be made by the manufacturer from the finished pipe. The
PA
results of these analyses shall be reported to the purchaser or
15213-2683.
the purchaser’s representative and shall conform to the require-
ments specified in Section 7.
TABLE 1 Chemical Requirements
9.2 If the analysis of one of the tests specified in 9.1 does
Composition, %
not conform to the requirements specified in Section 7,
Grade A Grade B Grade C analyses shall be made on additional pipes of double the
Carbon, maxA 0.25 0.30 0.35 original number from the same lot, each of which shall
Manganese 0.27–0.93 0.29–1.06 0.29–1.06
Phosphorus, max 0.035 0.035 0.035 conform to requirements specified.
Sulfur, max 0.035 0.035 0.035
Silicon, min 0.10 0.10 0.10
NOTE 4—A lot shall consist of the number of lengths specified in
Chrome, maxB 0.40 0.40 0.40 Sections 9 and 21 of the same size and wall thickness from any one heat
Copper, maxB 0.40 0.40 0.40 of steel.
Molybdenum, maxB 0.15 0.15 0.15
Nickel, maxB 0.40 0.40 0.40 10. Tensile Requirements
Vanadium, maxB 0.08 0.08 0.08
10.1 The material shall conform to the requirements as to
A
For each reduction of 0.01 % below the specified carbon maximum, an tensile properties prescribed in Table 2. Computed elongation
increase of 0.06 % manganese above the specified maximum will be permitted
up to a maximum of 1.35 %. values are contained in Table 3 and Table 4.
B
These five elements combined shall not exceed 1 %.
 A 106
TABLE 2 Tensile Requirements

Grade A Grade B Grade C

(Explanatory
Note 2)
Tensile strength, min, psi (MPa) 48 000 (330) 60 000 (415) 70 000 (485)
Yield strength, min, psi (MPa) 30 000 (205) 35 000 (240) 40 000 (275)
Longitu- Transverse Longitu- Transverse Longitu- Transverse
dinal dinal dinal
Elongation in 2 in. or 50 mm, min, %: A 106
Basic minimum elongation transverse strip tests, and for all small 35 25 30 16.5 30 16.5
sizes tested in full section
When standard round 2-in. or 50-mm gage length test specimen is 28 20 22 12 20 12
used
A,B A,B A,B
For longitudinal strip tests
For transverse strip tests, a deduction for each1⁄32-in. (0.8-mm) 1.25C 1.00C 1.00 C
decrease in wall thickness below 5⁄16in. (7.9 mm) from the basic
minimum elongation of the following percentage shall be made
A
The minimum elogation in 2 in. (50.8 mm) shall be determined by the following equation:
/
e 5 625 000A0.2 U 0.9

where:
e = minimum elongation in 2 in. (50.8 mm), %, rounded to the nearest 0.5%
A = cross-sectional area of the tension test specimen, in.2, based on specified outside diameter or nominal specimen width and specified wall thickness rounded to
the nearest 0.01 in. 2(if the area thus caluclated is greater than the value 0.75 in. 2 shall be used), and
U = specified tensile strength, psi.
B
See Table number 4 for minimum elongation values for various size tension specimens and grades.
C
Table number 3 gives the computed minimum values:

TABLE 3 Computed Transverse Elongation A

Wall Thickness Elongation in 2 in. or 50 mm, min, %

in. mm Grade A, Transverse Grades B and C, Transverse
5
⁄16 (0.312) 7.9 25.00 16.50
9
⁄32 (0.281) 7.1 23.75 15.50
1
⁄4(0.250) 6.4 22.50 14.50

A
This table gives the computed minimum elongation values for each 1⁄32-in. (0.8-mm) decrease in wall thickness. Where the wall thickness lies between two values
shown above, the minimum elongation value is determined by the following equation:
Grade Direction of Test Equation
A Transverse E = 40t + 12.50
B and C Transverse E = 32t + 6.50
where:
E = elongation in 2 in. or 50 mm, %, and
t = actual thickness of specimen, in.

TABLE 4 Elongation Values

Elongation in 2 in. min., Specified Tensile Strength, psi

Grade A Grade B
Tension Test Specimen Wall Thickness, in.B Grade C
2A
Area, in.
⁄2 in. Specimen
1 3
⁄4 in. Specimen 1 in. Specimen 1 1⁄2 in. Specimen 48 000 60 000 70 000

$ 0.75 $ 1.491 $ 0.994 $ 0.746 $ 0.497 36.0 29.5 25.5

0.74 1.470–1.490 0.980–0.993 0.735–0.745 0.490–0.496 36.0 29.5 25.5
0.73 1.451–1.469 0.967–0.979 0.726–0.734 0.484–0.489 36.0 29.5 25.5
0.72 1.430–1.450 0.954–0.966 0.715–0.725 0.477–0.483 36.0 29.5 25.5
0.71 1.411–1.429 0.941–0.953 0.706–0.714 0.471–0.476 35.5 29.0 25.5
0.70 1.390–1.410 0.927–0.940 0.695–0.705 0.464–0.470 35.5 29.0 25.5
0.69 1.371–1.389 0.914–0.926 0.686–0.694 0.457–0.463 35.5 29.0 25.5
0.68 1.350–1.370 0.900–0.913 0.675–0.685 0.450–0.456 35.5 29.0 25.0
0.67 1.331–1.349 0.887–0.899 0.666–0.674 0.444–0.449 35.5 29.0 25.0
0.66 1.310–1.330 0.874–0.886 0.655–0.665 0.437–0.443 35.0 29.0 25.0
0.65 1.291–1.309 0.861–0.873 0.646–0.654 0.431–0.436 35.0 28.5 25.0
0.64 1.270–1.290 0.847–0.860 0.635–0.645 0.424–0.430 35.0 28.5 25.0
0.63 1.251–1.269 0.834–0.846 0.626–0.634 0.417–0.423 35.0 28.5 25.0
0.62 1.230–1.250 0.820–0.833 0.615–0.625 0.410–0.416 35.0 28.5 25.0
0.61 1.211–1.229 0.807–0.819 0.606–0.614 0.404–0.409 34.5 28.5 24.5
 TABLE 4 Continued
Elongation in 2 in. min., Specified Tensile Strength, psi
Grade A Grade B
Tension Test Specimen Wall Thickness, in.B Grade C
2A
Area, in. 1
⁄2 in. Specimen 3
⁄4 in. Specimen 1 in. Specimen 1 1⁄2 in. Specimen 48 000 60 000 70 000

0.60 1.190–1.210 0.794–0.806 0.595–0.605 0.397–0.403 34.5 28.5 24.5

0.59 1.171–1.189 0.781–0.793 0.586–0.594 0.391–0.396 34.5 28.0 24.5
0.58 1.150–1.170 0.767–0.780 0.575–0.585 0.384–0.390 34.5 28.0 24.5
0.57 1.131–1.149 0.754–0.766 0.566–0.574 0.377–0.383 34.0 28.0 24.5
0.56 1.110–1.130 0.740–0.753 0.555–0.565 0.370–0.376 34.0 28.0 24.5
0.55 1.091–1.109 0.727–0.739 0.546–0.554 0.364–0.369 34.0 28.0 24.9
0.54 1.070–1.090 0.714–0.726 0.535–0.545 0.357–0.363 34.0 27.5 24.0
0.53 1.051–1.069 0.701–0.713 0.526–0.534 0.351–0.356 33.5 27.5 24.0
0.52 1.030–1.050 0.687–0.700 0.515–0.525 0.344–0.350 33.5 27.5 24.0
0.51 1.011–1.029 0.674–0.686 0.506–0.514 0.337–0.343 33.5 27.5 24.0
0.50 0.990–1.010 0.660–0.673 0.495–0.505 0.330–0.336 33.5 27.0 23.5
0.49 0.971–0.989 0.647–0.659 0.486–0.494 0.324–0.329 33.0 27.0 23.5
0.48 0.950–0.970 0.634–0.646 0.475–0.485 0.317–0.323 33.0 27.0 23.5
0.47 0.931–0.949 0.621–0.633 0.466–0.474 0.311–0.316 33.0 27.0 23.5
0.46 0.910–0.930 0.607–0.620 0.455–0.465 0.304–0.310 33.0 27.0 23.5
0.45 0.891–0.909 0.594–0.606 0.446–0.454 0.297–0.303 32.5 26.5 23.0
0.44 0.870–0.890 0.580–0.593 0.435–0.445 0.290–0.296 32.5 26.5 23.0
0.43 0.851–0.869 0.567–0.579 0.426–0.434 0.284–0.289 32.5 26.5 23.0
0.42 0.830–0.850 0.554–0.566 0.415–0.425 0.277–0.283 32.0 26.5 23.0
0.41 0.811–0.829 0.541–0.553 0.406–0.414 0.271–0.276 32.0 26.0 23.0
0.40 0.790–0.810 0.527–0.540 0.395–0.405 0.264–0.270 32.0 26.0 22.5
0.39 0.771–0.789 0.514–0.526 0.386–0.394 0.257–0.263 31.5 26.0 22.5
0.38 0.750–0.770 0.500–0.513 0.375–0.385 0.250–0.256 31.5 26.0 22.5
0.37 0.731–0.749 0.487–0.499 0.366–0.374 0.244–0.249 31.5 25.5 22.5
0.36 0.710–0.730 0.474–0.486 0.355–0.365 0.237–0.243 31.0 25.5 22.0
0.35 0.691–0.709 0.461–0.473 0.346–0.354 0.231–0.236 31.0 25.5 22.0
0.34 0.670–0.690 0.447–0.460 0.335–0.345 0.224–0.230 31.0 25.0 22.0
0.33 0.651–0.669 0.434–0.446 0.326–0.334 0.217–0.223 30.5 25.0 22.0
0.32 0.630–0.650 0.420–0.433 0.315–0.325 0.210–0.216 30.5 25.0 21.5
0.31 0.611–0.629 0.407–0.419 0.306–0.314 0.204–0.209 30.5 25.0 21.5
0.30 0.590–0.610 0.394–0.406 0.295–0.305 0.197–0.203 30.0 24.5 21.5
0.29 0.571–0.589 0.381–0.393 0.286–0.294 0.191–0.196 30.0 24.5 21.5
0.28 0.550–0.570 0.367–0.380 0.275–0.285 0.184–0.190 29.5 24.5 21.0
0.27 0.531–0.549 0.354–0.366 0.266–0.274 0.177–0.183 29.5 24.0 21.0
0.26 0.510–0.530 0.340–0.353 0.255–0.265 0.170–0.176 29.0 24.0 21.0
0.25 0.491–0.509 0.327–0.339 0.246–0.254 0.164–0.169 29.0 23.5 20.5
0.24 0.470–0.490 0.314–0.326 0.235–0.245 0.157–0.163 29.0 23.5 20.5
0.23 0.451–0.469 0.301–0.313 0.226–0.234 0.151–0.156 28.5 23.5 20.5
0.22 0.430–0.450 0.287–0.300 0.215–0.225 0.144–0.150 28.5 23.0 20.0
0.21 0.411–0.429 0.274–0.286 0.206–0.214 0.137–0.143 28.0 23.0 20.0
0.20 0.390–0.410 0.260–0.273 0.195–0.205 0.130–0.136 27.5 22.5 19.5
0.19 0.371–0.389 0.247–0.259 0.186–0.194 0.124–0.129 27.5 22.5 19.5
0.18 0.350–0.370 0.234–0.246 0.175–0.185 0.117–0.123 27.0 22.0 19.5
0.17 0.331–0.349 0.221–0.233 0.166–0.174 0.111–0.116 27.0 22.0 19.0
0.16 0.310–0.330 0.207–0.220 0.155–0.165 0.104–0.110 26.5 21.5 19.0
0.15 0.291–0.309 0.194–0.206 0.146–0.154 0.097–0.103 26.0 21.5 18.5
0.14 0.270–0.290 0.180–0.193 0.135–0.145 0.091–0.096 26.0 21.0 18.5
0.13 0.251–0.269 0.167–0.179 0.126–0.134 0.084–0.090 25.5 21.0 18.0
0.12 0.230–0.250 0.154–0.166 0.115–0.125 0.077–0.083 25.0 20.5 18.0
0.11 0.211–0.229 0.141–0.153 0.106–0.114 0.071–0.076 24.5 20.0 17.5
0.10 0.190–0.210 0.127–0.140 0.095–0.105 0.064–0.070 24.0 19.5 17.0
0.09 0.171–0.189 0.114–0.126 0.086–0.094 0.057–0.063 23.5 19.5 17.0
0.08 0.150–0.170 0.100–0.113 0.075–0.085 0.050–0.056 23.0 19.0 16.5
0.07 0.131–0.149 0.087–0.099 0.066–0.074 0.044–0.049 22.5 18.5 16.0
0.06 0.110–0.130 0.074–0.086 0.055–0.065 0.037–0.043 22.0 18.0 15.5
0.05 0.091–0.109 0.061–0.073 0.046–0.054 0.031–0.036 21.0 17.0 15.0
0.04 0.070–0.090 0.047–0.060 0.035–0.045 0.024–0.030 20.0 16.5 14.5
0.03 0.051–0.069 0.034–0.046 0.026–0.034 0.017–0.023 19.0 15.5 13.5
0.02 0.030–0.050 0.020–0.033 0.015–0.025 0.010–0.016 17.5 14.5 12.5
#0.01 # 0.029 # 0.019 # 0.014 # 0.009 15.0 12.5 11.0
A
1 in.2= 645.16 mm2.
B
1 in. = 25.4 mm.

11. Bending Requirements diameter (as shown in ANSI B 36.10) of the pipe, without
11.1 For pipe NPS 2 and under a sufficient length of pipe developing cracks. When ordered for close coiling (Note 2),
shall stand being bent cold through 90° around a cylindrical the pipe shall stand being bent cold through 180° around a
mandrel, the diameter of which is twelve times the outside cylindrical mandrel, the diameter of which is eight times the
outside diameter (as shown in ANSI B 36.10) of the pipe, imperfections that produce test signals equal or greater than
without failure. that of the calibration standard.
11.2 Subject to the approval of the purchaser, for pipe 14.2 When the nondestructive electric test is performed, the
whose diameter exceeds 10 in. (254 mm), it shall be permis- lengths shall be marked with the letters “NDE.” The certifica-
sible for the bend test to be substituted for the flattening test tion, when required, shall state “Nondestructive Electric
described in Section 12. The bend test specimens shall be bent Tested” and shall indicate which of the tests was applied. Also
at room temperature through 180° with the inside diameter of the letters “NDE” shall be appended to the product specifica-
the bend being 1 in. (25.4 mm), without cracking on the tion number and material grade shown on the certification.
outside portion of the bent portion. 14.3 The following information is for the benefit of the user
11.3 For pipe whose diameter exceeds 25 in. (635 mm) and of this specification:
whose diameter to wall thickness ratio is 7.0 or less, the bend 14.3.1 The reference standards defined in 14.4 through 14.6
test described in 11.2 shall be conducted instead of the are convenient standards for calibration of nondestructive
flattening test. testing equipment. The dimensions of such standards are not to
NOTE 5—Diameter to wall thickness ratio = specified outside diameter/ be construed as the minimum sizes of imperfections detectable
nominal wall thickness. by such equipment.
Example: For 28 in. diameter 5.000 in. thick pipe the diameter to wall 14.3.2 The ultrasonic testing referred to in this specification
thickness ratio = 28/5 = 5.6.
is capable of detecting the presence and location of significant
12. Flattening Tests longitudinally or circumferentially oriented imperfections:
however, different techniques need to be employed for the
12.1 Except as allowed by 11.2, for pipe over NPS 2, a
detection of such differently oriented imperfections. Ultrasonic
section of pipe not less than 21⁄2 in. (63.5 mm) in length shall
testing is not necessarily capable of detecting short, deep
be flattened cold between parallel plates until the opposite
imperfections.
walls of the pipe meet. Flattening tests shall be in accordance
with Specification A 530/A 530M, except that in the formula 14.3.3 The eddy current examination referenced in this
used to calculate the “H” value, the following “e” constants specification has the capability of detecting significant imper-
shall be used: fections, especially of the short abrupt type.
14.3.4 The flux leakage examination referred to in this
0.08 for Grade A
specification is capable of detecting the presence and location
0.07 for Grades B and C
of significant longitudinally or transversely oriented imperfec-
12.2 When low D-to-t ratio tubulars are tested, because the
tions: however, different techniques need to be employed for
strain imposed due to geometry is unreasonably high on the
the detection of such differently oriented imperfections.
inside surface at the six and twelve o’clock locations, cracks at
these locations shall not be cause for rejection if the D-to-t 14.3.5 The hydrostatic test referred to in Section 13 has the
ratio is less than ten. capability of finding defects of a size permitting the test fluid
to leak through the tube wall and may be either visually seen
NOTE 6—The H values have been calculated for sizes from NPS 21⁄2 to or detected by a loss of pressure. Hydrostatic testing is not
24, inclusive, and are shown in Table X1.1 of this specification. necessarily capable of detecting very tight, through-the-wall
13. Hydrostatic Test imperfections or imperfections that extend an appreciable
distance into the wall without complete penetration.
13.1 Each length of pipe shall withstand without leakage
14.3.6 A purchaser interested in ascertaining the nature
through the pipe wall, a hydrostatic test, except as provided for
(type, size, location, and orientation) of discontinuities that can
in 13.2, 13.3, and 13.4.
be detected in the specific applications of these examinations
13.2 When specified by the purchaser, it shall be permis-
is directed to discuss this with the manufacturer of the tubular
sible for pipe to be tested by the nondestructive electric test
product.
described in Section 14 in lieu of the hydrostatic test.
14.4 For ultrasonic testing, the calibration reference notches
13.3 When specified in the order, pipe shall be furnished
shall be, at the option of the producer, any one of the three
without hydrostatic test and without the NDE in Section 14. In
common notch shapes shown in Practice E 213. The depth of
this case, each length so furnished shall include the mandatory
notch shall not exceed 121⁄2 % of the specified wall thickness
marking of the letters “NH.”
of the pipe or 0.004 in. (0.102 mm), whichever is greater.
13.4 When the hydrostatic test and the NDE test are omitted
and the lengths marked with the letters “NH,” the certification, 14.5 For eddy current testing, the calibration pipe shall
when required, shall clearly state “Not Hydro Statically contain, at the option of the producer, any one of the following
Tested,” the specification number and material grade, as shown discontinuities to establish a minimum sensitivity level for
on the certification, shall be followed by the letters “NH.” rejection:
14.5.1 Drilled Hole—The calibration pipe shall contain
14. Nondestructive Electric Test depending upon the pipe diameter three holes spaced 120°
14.1 When allowed by 13.2, each pipe shall be tested with apart or four holes spaced 90° apart and sufficiently separated
a nondestructive electric test in accordance with Practice longitudinally to ensure separately distinguishable responses.
E 213, Practice E 309, or Practice E 570. In such cases, the The holes shall be drilled radially and completely through the
marking of each length of pipe so furnished shall include the pipe wall, care being taken to avoid distortion of the pipe while
letters “NDE.” It is the intent of this test to reject pipe with drilling. Depending upon the pipe diameter the calibration pipe
s 14.5.3 Longitudinal which cannot be identified, specified in the purchase
h Notch—A notch 0.031 in. or produced by cracks or order, reported to the
a (0.787 mm) or less in width crack-like imperfections purchaser.
l shall be machined in a shall result in rejection of
l radial plane parallel to the the pipe, unless it is 15. Nipples
tube axis on the outside repaired and retested. To be 15.1 Nipples shall be cut
c surface of the pipe, to have accepted, the pipe must from pipe of the same
o a depth not exceeding 121⁄2 pass the same specifi- dimensions and quality
n % of the specified wall cation test to which it was described in this
t thickness of the tube or originally subjected, specification.
a 0.004 in. (0.102 mm), provided that the remaining
whichever is greater. The wall thickness is not 16. Dimensions, Weight,
i
length of the notch shall be decreased below that and Permissible Variations
n
compatible with the testing permitted by this 16.1 Weight—The
method. specification. The OD at the weight of any length of
t
14.5.4 Compatibility— point of grinding may be pipe shall not vary more
h
The discontinuity in the reduced by the amount so than 10 % over and 3.5 %
e
calibration pipe shall be reduced. under that specified.
compatible with the testing 14.7.2 Test signals Unless otherwise agreed
f produced by visual
equipment and the method upon between the
o being used. imperfections such as those manufacturer and the
l listed below may be purchaser, pipe in NPS 4
14.6 For flux leakage
l evaluated in accordance and smaller may be weighed
testing, the longitudinal
o with the provisions of in convenient lots; pipe
calibration reference
w Section 18: larger than NPS 4 shall
notches shall be straight-
i 14.7.2.1 Dinges, be weighed separately.
sided notches machined in a
n radial plane parallel to the 14.7.2.2 Straightener 16.2 Diameter—The
g pipe axis. For wall marks, tolerances for diameter
thickness under 14.7.2.3 Cutting chips, shall be in accordance with
h 1⁄2 in. (12.7 mm), outside 14.7.2.4 Scratches, the following:
o and inside notches shall be 14.7.2.5 Steel die 16.2.1 Except for pipe
l used; for wall thickness stamps, ordered as special outside
e equal and above 1⁄2 in. 14.7.2.6 Stop marks, or diameter tolerance pipe or
: (12.7 mm), only an outside 14.7.2.7 Pipe reducer as inside diameter tolerance
# ⁄ in.
1
2 notch shall be used. ripple. pipe, variations in outside
0.039 in. (1 mm)
> ⁄ # 1 ⁄ in.
1
2
1
4
Notch depth shall not 14.8 The test methods diameter shall not exceed
necessarily capable
0.055 in. (1.4 mm) of inspecting exceed
the end portion of pipes, a Over described
18 to 26, incl in this⁄ (0.125)
1
8
section those precribed
3.18 ⁄ (0.031)in Table
1
32 0.795.
>1 ⁄ # 2 in. Over 26 to 34, incl 5
⁄ (0.156) 3.97 ⁄ (0.031)
1
0.79
1
condition 4
referred to as “end 121⁄2The%length
effect.” of the specified
of such end are not
Over 34 to 48, incl 3
32

⁄ (0.187) 4.76
16.2.21 For
32
pipe
⁄ (0.031)
over
0.79
10
0.071 in. (1.8 mm) 16 32

effect shall
>2 # 5 in. be determined by wall
the thickness,
manufacturer or 0.004
and, whenin. in. (254 mm) OD ordered as
0.087 in. (2.2 mm) (0.102 mm), whichever is special outside diameter
>5 in.
0.106 in. (2.7 mm)
greater. Notch length shall tolerance pipe, the outside
not exceed 1 in. (25.4 mm), diameter shall not vary
14.5.2 Transverse and the width shall not more than 1 % over or 1 %
Tangential Notch—Using a exceed the depth. Outside under the specified outside
round tool or file with a diameter and inside diameter.
1⁄4in. (6.4-mm) diameter, a
diameter notches shall be 16.2.3 For pipe over 10
notch shall be filed or located suffi- ciently apart in. (254 mm) ID ordered as
milled tangential to the to allow separation and inside diameter tolerance
surface and transverse to the identification of the pipe, the inside diameter
longitu- dinal axis of the signals. shall not vary more than 1
pipe. Said notch shall have a 14.7 Pipe containing one % over or 1 % under the
depth not exceeding 121⁄2 % or more imperfections that specified inside diameter.
of the specified wall pro- duce a signal equal to 16.3 Thickness—The
thickness of the pipe or or greater than the signal minimum wall thickness at
0.004 in. produced by the calibration any point shall not be more
(0.102 standard shall be rejected or than 12.5 % under the
mm), the area producing the nominal wall thickness
whicheve signal shall be reexamined. specified.
r is 14.7.1 Test signals
greater. NOTE 7—The minimum wall
produced by imperfections
thicknesses on inspection of
some of the available sizes are
shown in Table X2.1.

17. Lengths
17.1 Pipe lengths shall be
in accordance with the
following regular practice:
17.1.1 The lengths
required shall be specified
in the order, and
17.1.2 No jointers are
permitted unless otherwise
specified.
17.1.3 If definite lengths
are not required, pipe may
be ordered in single random
lengths of 16 to 22 ft (4.8 to
6.7 m) with 5 % 12 to 16 ft
(3.7 to 4.8 m), or in double
random lengths with a
minimum average of 35 ft
(10.7 m) and a minimum
length of 22 ft with 5 % 16
to 22 ft.
18. Workmanship, Finish
and Appearance
18.1 The pipe
manufacturer shall explore a
sufficient num- ber of
visual surface
imperfections to provide
reasonable

TABLE 5
Variations in Outside Diameter
NPS Designator
Permissible Variations in Outside

Diameter

Over
Under
in.
mm in. mm
⁄8to 11⁄2, incl
1 1
⁄64(0.015) 0.40 1
⁄64(0.015) 0.40
Over 11⁄2 to 4, incl ⁄32 (0.031)
1
0.79 ⁄32 (0.031)
1
0.79
Over 4 to 8, incl 1
⁄16(0.062)
1.59 1
⁄32(0.031) 0.79
Over 8 to 18, incl 3
⁄32(0.093)
2.38 1
⁄32 (0.031) 0.79
assurance that they have nominal wall thickness. s
been properly evaluated 18.4 At the purchaser’s F h
with respect to depth. discretion, pipe shall be i a
Exploration of all surface subjected to rejection if n l
imperfections is not required surface imperfections i l
but consideration should be acceptable under 18.2 are s
given to the necessity of not scattered, but appear h b
exploring all surface over a large area in excess 19.1 The Pipe shall be e
imperfections to assure of what is considered a furnished to the following
compliance with workmanlike finish. practice, unless otherwise p
1 Disposition of such pipe specified. l
8 shall be a matter of 19.1.1 NPS 1-1/2 and a
. agreement between the Smaller—All walls shall be i
2 manufacturer and the either plain-end square cut, n
. purchaser. or plain-end beveled at the -
18.2 Surface 18.5 When imperfections option of the manufacturer. e
imperfections that penetrate or defects are removed by 19.1.2 NPS 2 and n
more than 121⁄2 % of the grind- ing, a smooth curved Larger—Walls through d
nominal wall thickness or surface shall be maintained, extra strong weights, shall
encroach on the minimum and the wall thickness shall be plain end-beveled.
wall thickness shall be s
not be decreased below that 19.1.3 NPS 2 and Larger
considered defects. Pipe q
permitted by this —Walls over extra strong
with such defects shall be u
specification. The outside weights,
given one of the following a
diameter at the point of
dispositions: r
grinding is permitted to be
18.2.1 The defect shall be e
reduced by the amount so
removed by grinding, removed.
provided that the remaining 18.5.1 Wall thickness c
wall thickness is within the measurements shall be made u
limits specified in 16.3. with a mechanical caliper or t
18.2.2 Repaired in with a properly calibrated .
accordance with the repair nondestructive testing NOTE 9—Plain-end beveled is
welding provisions of 18.6. device of appropriate defined as plain-end pipe having
18.2.3 The section of accuracy. In case of dispute, a bevel angle of 30°, +5° or -0°,
pipe containing the defect the measurement determined as measured from a line drawn
may be cut off within the perpendicular to the axis of the
by use of the mechanical
pipe with a root face of 1⁄16 6
limits of requirements on caliper shall govern. 1
⁄32in. (1.5875 6 0.7938 mm).
length. 18.6 Weld repair shall Other bevel angles may be
18.2.4 Rejected. be permitted only subject specified by agreement between
18.3 To provide a to the approval of the the purchaser and the
workmanlike finish and purchaser and in accordance manufacturer.
basis for evalu- ating with Specification A 530/A 2
conformance with 18.2 the 530M. 0
pipe manufacturer shall 18.7 The finished pipe .
remove by grinding the shall be reasonably
following noninjurious straight. N
imperfections: u
NOTE 8—Marks and abrasions
18.3.1 Mechanical marks, are defined as cable marks, m
abrasions (Note 8) and pits, dinges, guide marks, roll marks, b
any of which imperfections ball scratches, scores, die marks, e
are deeper than 1⁄16 in. (1.58 etc.
r
mm).
18.3.2 Visual 1
9 o
imperfections commonly
. f
referred to as scabs, seams,
laps, tears, or slivers found
by exploration in accor- E T
dance with 18.1 to be n e
deeper than 5 % of the d s
t
s tension test specimen is less 22.4 Test specimens for
20.1 The tensile than that prescribed in Table the bend test specified in
requirements specified in 1 and any part of the fracture 11.2 and
Section 7 shall be is more than 3⁄4in. (19.0 mm) 11.3 shall be cut from one
determined on one length of from the center of the gage end of the pipe and, unless
pipe from each lot (Note 4) length of a 2-in. (50-mm) otherwise
of 400 lengths or fraction specimen as indicated by
thereof of each size under scribe scratches marked on
NPS 6, and from each lot of the specimen before testing,
200 lengths or fraction a retest shall be allowed. If a
thereof of each size NPS 6 specimen breaks in an inside
and over. or outside surface flaw, a
20.2 For pipe NPS 2 and retest shall be allowed.
under, the bend test 21.2 Should a crop end
specified in of a finished pipe fail in
11.1 shall be made on one the flattening test, one retest
pipe from each lot of 400 is permitted to be made
lengths or fraction thereof of from the failed end. Pipe
each size. The bend test, shall be normalized either
where used as permitted by before or after the first test,
11.2 or required by 11.3, but pipe shall be subjected
shall be made on one end of to only two normalizing
5 % of the pipe from each treatments.
lot. For small lots, at least 22.
one pipe shall be tested. Test
20.3 The flattening test Speci
specified in Section 12 mens
shall be made on one length and
of pipe from each lot of 400 Test
lengths or fraction thereof of Metho
each size over NPS 2, up to ds
but not including NPS 6, 22.1 On NPS 8 and
and from each lot of 200 larger, specimens cut either
lengths or fraction thereof, longitudi- nally or
of each size NPS 6 and transversely shall be
over. acceptable for the tension
20.4 Each length of pipe test. On sizes smaller than
shall be subjected to the NPS 8, the longitudinal test
hydro- static test specified only shall be used.
in Section 13. 22.2 When round tension
20.5 If any test specimen test specimens are used for
shows defective machining pipe wall thicknesses over
or develops flaws, it is 1.0 in. (25.40 mm), the mid–
permissible to discard the length of the longitudinal
flawed specimen and axis of such test specimens
substitute another specimen. shall be from a location
2 midway between the inside
1 and outside surfaces of the
. pipe.
22.3 Test specimens for
R the bend test specified in
e Section 11 and for the
t flattening tests shall consist
e of sections cut from a pipe.
s Specimens for flattening
t tests shall be smooth on the
s ends and free from burrs,
21.1 If the percentage except when made on crop
of elongation of any ends.
specified, shall be taken in a transverse direction. One test marked on the bundle tag; individual lengths of pipe need not
specimen shall be taken as close to the outer surface as be marked with footage. For sizes less than NPS 3⁄4, all the
possible and another from as close to the inner surface as required markings shall be on the bundle tag or on each length
possible. The specimens shall be either 1⁄2 by 1⁄2 in. (12.7 by of pipe and shall include the total footage; individual lengths
12.7 mm) in section or 1 by 1⁄2 in. (25.4 by 12.7 mm) in of pipe need not be marked with footage. If not marked on the
section with the corners rounded to a radius not over 1⁄16 in. bundle tag, all required marking shall be on each length.
(1.6 mm) and need not exceed 6 in. (152 mm) in length. The 24.2 When pipe sections are cut into shorter lengths by a
side of the samples placed in tension during the bend shall be subsequent processor for resale as material, the processor shall
the side closest to the inner and outer surface of the pipe transfer complete identifying information, including the name
respectively. or brand of the manufacturer to each unmarked cut length, or
22.5 All routine check tests shall be made at room tempera- to metal tags securely attached to bundles of unmarked small
ture. diameter pipe. The same material designation shall be included
with the information transferred, and the processor’s name,
23. Certification trademark, or brand shall be added.
23.1 When test reports are requested, in addition to the 24.3 Bar Coding—In addition to the requirements in 24.1
requirements of Specification A 530/A 530M, the producer or and 24.2, bar coding is acceptable as a supplementary identi-
supplier shall furnish to the purchaser a chemical analysis fication method. The purchaser may specify in the order a
report for the elements specified in Table 1. specific bar coding system to be used.
24. Product Marking 25. Government Procurement
24.1 In addition to the marking prescribed in Specification 25.1 When specified in the contract, material shall be
A 530/A 530M, the marking shall include heat number, the preserved, packaged, and packed in accordance with the
information as per Table 6, an additional symbol“ S” if one or requirements of MIL-STD-163. The applicable levels shall be
more of the supplementary requirements apply; the length, OD as specified in the contract. Marking for the shipment of such
1 %, if ordered as special outside diameter tolerance pipe; ID
material shall be in accordance with Fed. Std. No. 123 for civil
1 %, if ordered as special inside diameter tolerance pipe; the
agencies and MIL-STD-129 or Fed. Std. No. 183 if continuous
schedule number, weight class, or nominal wall thickness; and,
marking is required for military agencies.
for sizes larger than NPS 4, the weight. Length shall be
25.2 Inspection—Unless otherwise specified in the contract,
marked in feet and tenths of a foot, or metres to two decimal
the producer is responsible for the performance of all inspec-
places, depending on the units to which the material was
tion and test requirements specified herein. Except as
ordered, or other marking subject to agreement. For sizes NPS
otherwise specified in the contract, the producer shall use his
11⁄2, 11⁄4, 1, and 3⁄4, each length shall be marked as prescribed
own, or any other suitable facilities for the performance of the
in Specifi- cation A 530/A 530M. These sizes shall be
inspection and test requirements specified herein, unless
bundled in accor- dance with standard mill practice and the
disapproved by the purchaser. The purchaser shall have the
total bundle footage
right to perform any of the inspections and tests set forth in
this specification where such inspections are deemed
TABLE 6 Marking necessary to ensure that the
Hydro
Yes NDE
No Marking
Test Pressure
material conforms to the prescribed requirements.
No Yes NDE
No No NH 26. Keywords
Yes Yes Test Pressure/NDE
26.1 carbon steel pipe; seamless steel pipe; steel pipe

SUPPLEMENTARY REQUIREMENTS

One or more of the following supplementary requirements shall apply only when specified in the
purchase order. The purchaser may specify a different frequency of test or analysis than is provided
in the supplementary requirement. Subject to agreement between the purchaser and manufacturer,
retest and retreatment provisions of these supplementary requirements may also be modified.

S1. Product Analysis supplementary requirement is specified, the number of tests

S1.1 Product analysis shall be made on each length of pipe. per pipe shall also be specified. If a specimen from any length
Individual lengths failing to conform to the chemical compo- fails to meet the required tensile properties (tensile, yield, and
sition requirements shall be rejected. elongation), that length shall be rejected subject to retreatment
in accordance with Specification A 530/A 530M and satisfac-
S2. Transverse Tension Test tory retest.
S2.1 A transverse tension test shall be made on a specimen
from one end or both ends of each pipe NPS 8 and over. If this
S3. Flattening Test S5. Carbon Equivalent
S3.1 The flattening test of Specification A 530/A 530M S5.1 The steel shall conform to a carbon equivalent (CE) of
shall be made on a specimen from one end or both ends of 0.50 maximum as determined by the following formula:
each
pipe. Crop ends may be used. If this supplementary require- %Mn %Cr 1 %Mo 1 %V %Ni 1 %Cu
ment is specified, the number of tests per pipe shall also be CE 5 %C 1 6 1 5
1
15
specified. If a specimen from any length fails because of lack
S5.2 A lower CE maximum may be agreed upon between
of ductility prior to satisfactory completion of the first step of
the purchaser and the producer.
the flattening test requirement, that pipe shall be rejected
S5.3 The CE shall be reported on the test report.
subject to retreatment in accordance with Specification A 530/
A 530M and satisfactory retest. If a specimen from any length
S6. Heat Treated Test Specimens
of pipe fails because of a lack of soundness, that length shall
be rejected, unless subsequent retesting indicates that the S6.1 At the request of the purchaser, one tensile test shall be
remain- ing length is sound. performed by the manufacturer on a test specimen from each
heat of steel furnished which has been either stress relieved at
S4. Metal Structure and Etching Test 1250°F or normalized at 1650°F, as specified by the purchaser.
S4.1 The steel shall be homogeneous as shown by etching Other stress relief or annealing temperatures, as appropriate to
tests conducted in accordance with the appropriate sections of the analysis, may be specified by agreement between the
Method E 381. Etching tests shall be made on a cross section purchaser and the manufacturer. The results of this test shall
from one end or both ends of each pipe and shall show sound meet the requirements of Table 1.
and reasonably uniform material free from injurious lamina-
tions, cracks, and similar objectionable defects. If this supple- S7. Internal Cleanliness–Government Orders
mentary requirement is specified, the number of tests per pipe S7.1 The internal surface of hot finished ferritic steel pipe
required shall also be specified. If a specimen from any length and tube shall be manufactured to a free of scale condition
shows objectionable defects, the length shall be rejected, equivalent to the visual standard listed in SSPC-SP6. Cleaning
subject to removal of the defective end and subsequent retests shall be performed in accordance with a written procedure that
indicating the remainder of the length to be sound and has been shown to be effective. This procedure shall be
reasonably uniform material. available for audit.

APPENDIXES

(Nonmandatory Information)

X1. CALCULATED H VALUES FOR SEAMLESS PIPE

X1.1 Tables X1.1 and X1.2 list values for H to be used for
the test of Section 12.
 TABLE X1.1 Calculated “H” Values for Seamless Pipe
Inch-Pound Units
Distance, in inches, Distance, in inches,
Out- Between Plates Out- Between Plates
Wall Sched- Wall Sched-
NPS side 9H 9 by Equation: NPS side 9H 9 by Equation:
Thick- ule ~ 1 1 e !t
Thick- ule ~1 1 e!t
Desig- Diam- Desig- Diam-
ness, Num- H 5 2 ness, Num- H 5 2
nator eter, e 1 t/D nator eter, e 1 t/D

in. ber in. ber

in. Grade Grades in. Grade Grades
A B&C A B&C
21⁄2 2.875 0.203 40 1.456 1.545 14 14.000 0.250 10 2.759 3.045
0.276 80 1.694 1.779 0.312 20 3.294 3.617
0.375 160 1.925 2.002 0.375 30 3.792 4.146
0.438 40 4.669 5.125
3 3.500 0.216 40 1.646 1.755 0.593 60 5.234 5.647
0.300 80 1.955 2.062 0.750 80 6.064 6.494
0.438 160 2.306 2.398 0.937 100 6.887 7.322
1.093 120 7.479 7.902
31⁄2 4.000 0.226 40 1.788 1.912 1.250 140 7.974 8.397
0.318 80 2.153 2.276 1.406 160 8.416 8.827

4 4.500 0.237 40 1.929 2.067 16 16.000 0.250 10 2.284 3.124

0.337 80 2.350 2.489 0.312 20 3.387 3.730
0.438 120 2.687 2.818 0.375 30 3.915 4.294
0.531 160 2.896 3.022 0.500 40 4.854 5.284
0.656 60 5.855 6.324
5 5.563 0.258 40 2.205 2.372 0.843 80 6.861 7.352
0.375 80 2.747 2.920 1.031 100 7.709 8.206
0.500 120 3.179 3.346 1.218 120 8.426 8.919
0.625 160 3.509 3.667 1.438 140 9.141 9.625
1.593 160 9.579 10.050
6 6.625 0.280 40 2.473 2.669
0.432 80 3.213 3.419 18 18.000 0.250 10 2.876 3.189
0.562 120 3.682 3.884 0.312 20 3.462 3.823
0.719 160 4.116 4.307 0.438 30 4.535 4.963
0.562 40 5.457 5.941
8 8.625 0.250 20 2.477 2.702 0.750 60 6.656 7.185
0.277 30 2.668 2.902 0.937 80 7.663 8.214
0.322 40 2.964 3.210 1.156 100 8.657 9.216
0.406 60 3.451 3.711 1.375 120 9.495 10.043
0.500 80 3.914 4.181 1.562 140 10.115 10.660
0.593 100 4.305 4.573 1.781 160 10.665 11.198
0.719 120 4.750 5.013
0.812 140 5.036 5.293 20 20.000 0.250 10 2.919 3.242
0.906 160 5.288 5.538 0.375 20 4.101 4.521
0.500 30 5.143 5.632
10 10.750 0.250 20 2.615 2.868 0.593 40 5.841 6.367
0.307 30 3.054 3.333 0.812 60 7.272 7.856
0.365 40 3.459 3.757 1.031 80 8.464 9.072
0.500 60 4.268 4.592 1.281 100 9.601 10.221
0.593 80 4.738 5.070 1.500 120 10.452 11.069
0.719 100 5.320 5.621 1.750 140 11.284 11.889
0.843 120 5.747 6.077 1.968 160 11.913 12.504
1.000 140 6.242 6.564
1.125 160 6.580 6.892 24 24.000 0.250 10 2.986 3.326
0.375 20 4.236 4.686
12 12.750 0.250 20 2.711 2.985 0.562 30 5.869 6.437
0.330 30 3.366 3.683 0.687 40 6.831 7.454
0.406 40 3.921 4.266 0.968 60 8.690 9.390
0.562 60 4.892 5.271 1.218 80 10.061 10.793
0.687 80 5.542 5.934 1.531 100 11.449 12.244
0.843 100 6.231 6.627 1.812 120 12.585 13.32
1.000 120 6.817 7.209 2.062 140 13.424 14.150
1.125 140 7.222 7.607 2.343 160 14.248 14.958
1.312 160 7.747 8.119
 TABLE X1.2 Calculated “H” Values for Seamless Pipe Continued
SI Units
Distance, in mm, Distance, in mm,
Out- Between Plates Out- Between Plates
Wall Sched- Wall Sched-
NPS side 9H 9 by Equation: NPS side 9H 9 by Equation:
Thick- ule ~1 1 e!t
Thick- ule ~ 1 1 e !t
Desig- Diam- Desig- Diam-
ness, Num- H 5 2 ness, Num- H 5 2
nator eter, e 1 t/D nator eter, e 1 t/D

mm ber mm ber
mm Grade Grades mm Grade Grades
A B&C A B&C
2 1⁄2 73.0 5.16 40 37.0 39.2 14 355.6 6.35 10 70.1 77.3
7.01 80 43.0 45.2 7.92 20 83.7 91.8
9.52 160 48.9 50.8 9.52 30 96.3 105.3
11.13 40 118.6 130.2
3 88.9 5.49 40 41.8 44.6 15.06 60 132.9 143.4
7.62 80 49.6 52.4 19.05 80 154.0 165.0
11.13 160 58.6 60.9 23.80 100 174.9 186.0
27.76 120 190.0 200.7
31⁄2 101.6 5.74 40 45.4 48.6 31.75 140 202.5 213.3
8.08 80 54.7 57.8 35.71 160 213.8 224.2

4 114.3 6.02 40 49.0 52.5 16 406.4 6.35 10 71.7 79.4

8.56 80 59.7 63.2 7.92 20 89.0 94.7
11.13 120 67.0 71.6 9.52 30 99.4 109.1
13.49 160 73.6 76.8 12.70 40 123.3 143.2
16.66 60 148.7 160.6
5 141.3 6.55 40 56.0 60.2 21.41 80 174.3 186.7
9.52 80 69.8 74.2 26.19 100 195.8 208.4
12.70 120 80.8 85.0 30.94 120 214.0 226.6
15.88 160 89.1 93.1 36.53 140 232.2 244.5
40.46 160 243.3 255.3
6 168.3 7.11 40 62.8 67.8
10.97 80 81.6 86.8 18 457.2 6.35 10 73.0 81.0
14.27 120 93.5 98.6 7.92 20 87.9 97.1
18.24 160 104.6 109.4 11.13 30 115.2 126.1
14.27 40 139.5 150.9
8 219.1 6.35 20 63.0 68.6 19.05 60 169.1 182.5
7.04 30 67.8 73.7 23.80 80 194.6 208.6
8.18 40 75.3 81.5 29.36 100 219.9 234.1
10.31 60 87.7 94.3 34.92 120 241.2 255.1
12.70 80 99.4 106.2 39.67 140 256.9 270.7
15.06 100 109.4 116.2 45.24 160 270.9 284.4
18.24 120 120.6 127.3
20.62 140 127.9 134.4 20 508.0 6.35 10 74.1 82.4
23.01 160 134.3 140.7 9.52 20 104.2 114.8
12.70 30 130.6 143.0
10 273.0 6.35 20 66.4 72.8 15.06 40 148.4 161.7
7.80 30 77.6 84.7 20.62 60 184.7 199.5
9.27 40 87.9 95.4 26.19 80 215.0 230.4
12.70 60 108.4 116.6 32.54 100 243.9 259.6
15.06 80 120.4 128.8 38.10 120 265.5 281.2
18.24 100 135.1 142.8 44.45 140 286.6 302.0
21.41 120 146.0 154.4 49.99 160 302.6 317.6
25.40 140 158.6 166.7
28.58 160 167.1 175.1 24 609.6 6.35 10 75.8 84.5
9.52 20 107.6 119.0
12 323.8 6.35 20 68.9 75.8 14.27 30 149.1 163.5
8.38 30 85.5 93.6 17.35 40 173.5 189.3
10.31 40 99.6 108.4 24.59 60 220.7 238.5
14.27 60 124.3 133.9 30.94 80 255.6 274.1
17.35 80 140.8 150.7 38.89 100 290.8 311.0
21.41 100 158.3 168.3 46.02 120 319.7 338.6
25.40 120 173.2 183.1 52.37 140 341.0 359.4
28.58 140 183.4 193.2 59.51 160 361.9 379.9
33.32 160 196.8 206.2
 X2. MINIMUM WALL THICKNESS

X2.1 Table X2.1 lists minimum wall thicknesses for nomi- nal pipe wall thickness.

TABLE X2.1 Mimimum Wall Thicknesses on Inspection for Nominal (Average) Pipe Wall Thicknesses

NOTE 1—The following equation, upon which this table is based, may be applied to calculate minimum wall thickness from nominal (average) wall
thickness:
 tn 3 0.875 5 tm

where:
tn = nominal (average) wall thickness, in. and
tm = minimum wall thickness, in.
The wall thickness is expressed to three decimal places, the fourth decimal place being carried forward or dropped, in accordance with Practice E 29.
NOTE 2—This table covers some wall thicknesses associated with standard pipe sizes but is not meant to imply that these are the only thicknesses
obtainable under this specification.
Nominal Minimum Nominal Minimum Nominal Minimum
(Average) Thickness (Average) Thickness (Average) Thickness
Thickness on Inspec- Thickness on Inspec- Thickness on Inspec-
(tn) tion (tm) (tn) tion (tm) (tn) tion (tm)
in. mm in. mm in. mm in. mm in. mm in. mm
0.068 1.73 0.060 1.52 0.281 7.14 0.246 6.25 0.864 21.94 0.756 19.20
0.083 2.11 0.073 1.85 0.294 7.47 0.257 6.53 0.875 22.22 0.766 19.46
0.088 2.24 0.077 1.96 0.300 7.62 0.262 6.65 0.906 23.01 0.793 20.14
0.091 2.31 0.080 2.03 0.307 7.80 0.269 6.83 0.938 23.82 0.821 20.85
0.095 2.41 0.083 2.11 0.308 7.82 0.270 6.86 0.968 24.59 0.847 21.51
0.109 2.77 0.095 2.41 0.312 7.92 0.273 6.93 1.000 25.40 0.875 22.22
0.113 2.87 0.099 2.51 0.318 8.07 0.278 7.06 1.031 26.19 0.902 22.91
0.119 3.02 0.104 2.64 0.322 8.18 0.282 7.16 1.062 26.97 0.929 23.60
0.125 3.18 0.109 2.77 0.330 8.38 0.289 7.34 1.094 27.79 0.957 24.31
0.126 3.20 0.110 2.79 0.337 8.56 0.295 7.49 1.125 28.58 0.984 24.99
0.133 3.38 0.116 2.95 0.344 8.74 0.301 7.64 1.156 29.36 1.012 25.70
0.140 3.56 0.122 3.10 0.358 9.09 0.313 7.95 1.219 30.96 1.066 27.08
0.141 3.58 0.123 3.12 0.365 9.27 0.319 8.10 1.250 31.75 1.094 27.79
0.145 3.68 0.127 3.23 0.375 9.52 0.328 8.33 1.281 32.54 1.121 28.47
0.147 3.73 0.129 3.28 0.382 9.70 0.334 8.48 1.312 33.32 1.148 29.16
0.154 3.91 0.135 3.43 0.400 10.16 0.350 8.89 1.375 34.92 1.203 30.56
0.156 3.96 0.136 3.45 0.406 10.31 0.355 9.02 1.406 35.71 1.230 31.24
0.172 4.37 0.150 3.81 0.432 10.97 0.378 9.60 1.438 36.53 1.258 31.95
0.179 4.55 0.157 3.99 0.436 11.07 0.382 9.70 1.500 38.10 1.312 33.32
0.188 4.78 0.164 4.17 0.438 11.12 0.383 9.73 1.531 38.89 1.340 34.04
0.191 4.85 0.167 4.24 0.469 11.91 0.410 10.41 1.562 39.67 1.367 34.72
0.200 5.08 0.175 4.44 0.500 12.70 0.438 11.13 1.594 40.49 1.395 35.43
0.203 5.16 0.178 4.52 0.531 13.49 0.465 11.81 1.635 41.53 1.431 36.35
0.210 5.33 0.184 4.67 0.552 14.02 0.483 12.27 1.750 44.45 1.531 38.89
0.216 5.49 0.189 4.80 0.562 14.27 0.492 12.50 1.781 45.24 1.558 39.57
0.218 5.54 0.191 4.85 0.594 15.09 0.520 13.21 1.812 46.02 1.586 40.28
0.219 5.56 0.192 4.88 0.600 15.24 0.525 13.34 1.875 47.62 1.641 41.68
0.226 5.74 0.198 5.03 0.625 15.88 0.547 13.89 1.969 50.01 1.723 43.76
0.237 6.02 0.207 5.26 0.656 16.66 0.574 14.58 2.000 50.80 1.750 44.45
0.250 6.35 0.219 5.56 0.674 17.12 0.590 14.99 2.062 52.37 1.804 45.82
0.258 6.55 0.226 5.74 0.688 17.48 0.602 15.29 2.125 53.98 1.859 47.22
0.276 7.01 0.242 6.15 0.719 18.26 0.629 15.98 2.200 55.88 1.925 48.90
0.277 7.04 0.242 6.15 0.750 19.05 0.656 16.66 2.344 59.54 2.051 52.10
0.279 7.09 0.244 6.19 0.812 20.62 0.710 18.03 2.500 63.50 2.188 55.58
0.280 7.11 0.245 6.22 0.844 21.44 0.739 18.77

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