Electric-Fusion (Arc) - Welded Steel Pipe (NPS 4 and Over) : Standard Specification For
Electric-Fusion (Arc) - Welded Steel Pipe (NPS 4 and Over) : Standard Specification For
Electric-Fusion (Arc) - Welded Steel Pipe (NPS 4 and Over) : Standard Specification For
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Tensile strength, min, ksi [MPa] 48 [330] 60 [415] 60 [415] 60 [415] 66 [455]
Yield strength, min, ksi [MPa] 30 [205] 35 [240] 42 [290] 46 [315] 52 [360]
Elongation in 2 in. or 50 mm, min, %:
Basic minimum elongation for walls 5⁄16 in. [7.9 mm] and over in 35 30 25 23 22
thickness, longitudinal strip tests
For longitudinal strips tests, a deduction for each 1⁄32-in. [0.8-mm] 1.75A 1.50A 1.25 1.50 2.0
decrease in wall thickness below 5⁄16 in. [7.9 mm] from the
basic minimum elongation of the following percentageA
Elongation in 8 in. or 200 mm, min, %B,C Inch Pound Units, 1500/specified minimum tensile strength (ksi)
SI Units, 10 300/specified minimum tensile strength [MPa]
A
The table below gives the computed minimum values.
B
For wall thicknesses 1⁄2 in. [12.7 mm] and greater, the elongation may be taken in 8 in. or 200 mm.
C
The elongation in 8 in. or 200 mm need not exceed 30 %.
⁄
5 16 (0.312) 7.9 35.00 30.00
⁄
9 32 (0.281) 7.1 33.25 28.50
1⁄4 (0.250) 6.4 31.50 27.00
7⁄32 (0.219) 5.6 29.75 25.50
3⁄16 (0.188) 4.8 28.00 24.00
5⁄32 (0.156) 4.0 26.25 22.50
1⁄8 (0.125) 3.7 24.50 21.00
3⁄32 (0.094) 2.4 22.75 19.50
1⁄16 (0.062) 1.6 21.00 18.00
Note—The above 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 shall be determined by the following equation:
Grade Equation Equation
Inch-Pound Units SI Units
18. Ends
manufacturer, or may be taken from the skelp or plate, at a
18.1 Pipe shall be furnished with plain right-angle cut or
point which will be approximately 90° of arc from the weld in
beveled ends as specified. All burrs at the ends of pipe shall be
the finished pipe.
removed.
19.3 If the tension test specimen is taken transversely, the
18.2 When pipe is specified to have the ends prepared for
specimen shall be taken in accordance with Fig. 5.
field welding of circumferential joints, the ends shall be
beveled on the outside to an angle of 35°, measured from a line 19.4 The specimens for the reduced-section tension test of
drawn perpendicular to the axis of the pipe, with a tolerance of production welds shall be taken perpendicularly across the
621⁄2 ° and with a width of root face (or flat at the end of the weld at the end of the pipe. The test specimens shall have the
pipe) of 1⁄16 6 1⁄32 in. [1.6 6 0.8 mm]. Unless otherwise weld approximately in the middle of the specimen. The
specified, the outside circumference of pipe ends for a distance specimens shall be straightened and tested at room tempera-
of not less than 4 in. [101.6 mm] shall not vary more than ture.
660 % of the nominal wall thickness of the pipe from the 19.5 Reduced-section tension test specimens shall be pre-
nominal outside circumference based on the diameter pared in accordance with Fig. 1.
specified, except that the tolerance shall be not less than 63
⁄16 in. [4.8 mm]. 20. Inspection
18.3 Pipe ends for use with mechanical couplings shall have 20.1 The inspector representing the purchaser shall have
tolerances within the limits required by the manufacturer of the entry, at all times while work on the contract of the purchaser
type of coupling to be used. is being performed, to all parts of the manufacturer’s works
that concern the manufacture of the material ordered. The
18.4 Upon agreement between the purchaser and the
manufacturer shall afford the inspector all reasonable facilities
manufacturer, the ends of the pipe may be sized within
to satisfy him that the material is being furnished in accordance
agreed-upon tolerances, if necessary to meet the requirements
with this specification. All tests and inspection shall be made at
of special installations.
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