ASTM A134 Standard for Steel Pipe Electric-Fusion Arc-Welded

Standard
Specification

ASTM A-134-XX (XX= Represents year of last revision) 
Pipe, Steel, Electirc-Fusion-Welded: 
Sizes - NPS 16 and Over

Scope

This specification covers electric-fusion (arc)-welded straight seam or spiral seam steel pipe of 16 in. and over in diameter 1 (inside or outside) with wall thickness up to ¾ in., inclusive. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.

1 Acceptability for many services may be controlled by codes of standards such as those published by the American National Standards Institute and American Society of Mechanical Engineers ASME.

Material

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.

Manufacture

All longitudinal seams, spiral seams, and shop girth seams shall be butt-welded. The weld shall be made by automatic means except for the assembly and the repairs that can be done by manual procedure.

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

Where :

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.

2 = When the diameter and wall thickness of pipe are such that the capacity limits of testing equipment are exceeded by these requirements, the test pressures may be reduced by agreement between the purchaser and the manufacturer.

Test pressure shall be held for not less than 5 sec, or for a longer time as agreed upon between the purchaser and the manufacturer.

Note: When agreed upon between the purchaser and the manufacturer and so stated on the order, pipe may be tested to 1 and ½ times the specified working pressure, except that the maximum test pressure shall not exceed 2800 psi nor shall the maximum fiber stress exceed 85% of minimum yield point.

When specified in the order, pipe may be furnished without hydrostatic testing, however each length so furnished shall include the mandatory marking of the letters " NH ".

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 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 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.

Marking

Each section of pipe shall be marked with the manufacturer’s distinguishing marking, this specification number and the pipe grade.