ASTM A139 Standard Specification

/ A139M – 04(2010) Standard Specification for Electric-Fusion (Arc)-Welded (NPS 4 and Over). Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification and the grades of steel of the manufactured pipes. The pipe is intended for conveying liquid, gas, or vapor.

Steel fabrication process

The steel shall be made by one or more of the following processes:

  • Martin / Bessemer -open hearth furnace, basic-oxygen or electric-furnace.

Permissible variations in weights and dimensions


The weight of any length of pipe shall not vary more than 10% over the specified weight.

The weight of any length of pipe shall not vary more than 5% under the specified weight when the specified wall thickness is 0.188″ or less or more than 5.5% under when the wall thickness is greater than 0.188″.


The minimum wall thickness at any point shall be not more than 12.5% under the nominal wall thickness.


The pipe shall be substantially round. The outside circumference of the pipe shall not vary more than 1.0%, but not exceeding ¾ in. from the nominal outside circumference based upon the diameter specified, except that the circumference at ends shall be sized, if necessary, to meet the requirements of Section 15.


Finished pipe shall be commercially straight. When specific straightness requirements are desired, the order should so state and be agreed upon between the purchaser and the manufacturer.

ASTM A139 standard covers five grades of electric-fusion(arc)-welded straight-seam or helical steel pipe including pipe of NPS 4 and over. The required chemical composition, tensile requirements of the steel, and the tensile requirements of the production welds are presented. Heat analysis of each heat of steel was made to determine the percentage of the elements as per chemical requirements. Tests to be performed shall include one longitudinal tension test for the steel, one reduced-section production weld test for the pipe, and hydrostatic test for each length of the pipe.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.


1.1 This specification covers five grades of electric-fusion (arc)-welded straight-seam or helical-seam steel pipe. Pipe of NPS 4 (Note 1) and larger with nominal (average) wall thickness of 1.0 in. [25.4 mm] and less are covered. Listing of standardized dimensions are for reference (Note 2). The grades of steel are pipe mill grades having mechanical properties which differ from standard plate grades. The pipe is intended for conveying liquid, gas, or vapor.

Note 1—The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,”“ size,” and “nominal size.”

Note 2—A comprehensive listing of standardized pipe dimensions is contained in ASME B36.10M.

Note 3—The suitability of pipe for various purposes is somewhat dependent on its dimensions, properties, and conditions of service. For example, for high-temperature service see applicable codes and Specification A691.

1.2 The values stated in either inch-pound units or in SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values in each system are not exact equivalents; therefore, each system is to be used independently of the other.

Referenced Documents (purchase separately)

ASTM Standards

  • A370 Test Methods and Definitions for Mechanical Testing of Steel Products
  • A691 Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures
  • A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
  • E59 Practice for Sampling Steel and Iron for Determination of Chemical Composition

American Welding Society Standard

AWSB2.1 Standard for Welding Procedure and Performance Qualifications Welding Handbook, Vol 1, 8th ed
ASME Standards

ASMEBoilerandPressur Welding Qualifications

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