ASTM A134 – 96(2005) Standard Specification for Pipe, Steel, Electric-Fusion (Arc)-Welded (Sizes NPS 16 and Over)
ASTM A134 standard covers electric-fusion (arc)-welded straight seam or spiral seam steel pipes with diameters NPS 16 and larger. The materials for these pipes as well as the welding procedure shall conform to other ASTM standards listed herein. This standard also contains requirements for the permissible weight and dimension variations and pipe lengths.
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 electric-fusion (arc)-welded straight seam or spiral seam steel pipe NPS 16 and over in diameter (inside or outside as specified by purchaser), with wall thicknesses up to 3/4 in. (19.0 mm), inclusive. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.
Note 1—Acceptability for many services may be controlled by codes or standards such as those published by the American National Standards Institute and American Society of Mechanical Engineers.
Note 2—For testing methods not specifically covered in this specification, reference can be made to Test Methods and Definitions A 370, with particular reference to Annex A 2 on Steel Tubular Products.
Note 3—A comprehensive listing of standardized pipe dimensions is contained in ANSI B 36.10.
1.2 The values stated in inch-pound units are to be regarded as the standard.
Note 4—The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter”, “size”, and “nominal size”.
1.3 The following precautionary caveat pertains specifically to Section 5 of this specification.This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
The steel from which the pipe is made shall conform to specifications A-283/A-283M, A-285/A-285M, A-570 or A-36/A-36M or to other ASTM specifications for equally suitable weldable material.
Hydrostatic test time of testing
Each length of pipe shall be tested by the manufacturer to a hydrostatic pressure that will produce in the pipe wall a stress of 60% of the specified minimum yield point of the steel used at room temperature. The pressure shall be determined by the following equation : P=2St/D
P= minimum hydrostatic test pressure, psi (not to exceed 2800 psi)2
S= 0.60 times the minimum specified yield point of the steel used, psi (M Pa)
t= specified wall thickness, in.
D= specified outside diameter, in.
Test and number of production weld tests
The weld-test specimens for the reduced-section tension test shall be taken perpendicularly across the weld and the test pieces shall have the weld in the middle of the specimen.
One weld test for the reduced-section tension shall be made from each lot of 3000 ft. of pipe or fraction thereof of each size and wall thickness.
PERMISSABLE VARIATIONS IN WEIGHTS AND DIMENSIONS
Thickness and Weight : The wall thickness and weight for welded pipe under this specification shall be governed by the requirements of the specifications to which the steel was ordered.
Circumference : The outside circumference of the pipe shall not vary more than ± 0.5% from the nominal outside circumference based upon the diameter specified on the order.
Straightness : Finished pipe shall be commercially straight. When specific straightness requirements are desired, the order should so state, and the tolerances shall be a matter of agreement between the manufacturer and the purchaser.
Ovality (out-of-roundness) : The difference between major and minor outside diameter shall not exceed 1%. Closer tolerances may be established by agreement between the manufacturer and the purchaser.
Length : The lengths shall be as specified on the order with a tolerance of ± 1/2″.
Finish of the ends
Pipe shall be furnished with a plain right angle cut or with bevel ends as specified.
Unless otherwise specified, pipe with beveled ends shall meet the requirements of ANSI B16.25.
Finish of the pipes
The repairs by welding of damages in the pipe wall, provided their depth does not exceed 1/3 the specified wall thickness, will be permitted. Defects in the welds, such as sweats or leaks, shall be repaired or the piece rejected at the option of the manufacturer. All repaired pipe shall be tested hydrostatically.
Each section of pipe shall be marked with the manufacturer’s distinguishing marking, this specification number and the pipe grade.