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<br /> A53/A53M — 12
<br /> (I)Test specimens taken from, and representative of, the NOTF.4—The hydrostatic test pressures given herein are inspection test
<br /> front end of the first pipe intended to be supplied from each pressures,are not intended as a basis for design,and do not have any direct
<br /> coil,the back end of the last pipe intended to be supplied from relationship to working pressures.
<br /> each coil,and each side of any intermediate weld stop location 8.3 The minimum hydrostatic test pressure required to
<br /> shall be flattened with the weld located at 90°from the line of satisfy the requirements specified in 8.2 need not exceed 2500
<br /> direction of force. psi [17 200 kPa] for pipe NPS 3 [DN 80] or smaller, or 2800
<br /> (2)Test specimens taken from pipe at any two locations psi [19 300 kPa] for pipe larger than NPS 3 [DN 80];however,
<br /> intermediate to the front end of the first pipe and the back end the manufacturer has the option of using higher test pressures.
<br /> of the last pipe intended to be supplied from each coil shall be For all sizes of seamless pipe and electric-resistance-welded
<br /> flattened with the weld located at 0°from the line of direction pipe, the hydrostatic test pressure shall be maintained for at
<br /> of force. least 5 s.
<br /> 7.3.3.4 For pipe that is to be subsequently reheated through- 9. Nondestructive Electric Test
<br /> out its cross section and hot formed by a reducing process,the 9.1 Type E Pipe:
<br /> manufacturer shall have the option of obtaining the flattening 9.1.1 Except for pipe produced on a hot-stretch reducing
<br /> test specimens required by 7.3.3.2 or 7.3.3.3, whichever is mill, the weld seam of each length of electric-resistance-
<br /> applicable, either prior to or after such hot reducing,
<br /> welded pipe NPS 2 [DN 50] or larger shall be tested with a
<br /> 7.3.4 Continuous-Welded Pipe—A test specimen at least 4 nondestructive electric test in accordance with Practices E?13,
<br /> in. [100 mm] in length shall be flattened cold between parallel E273, E309, or E570. Each length of electric-resistance-
<br /> plates in three steps.The weld shall be located at 90°from the welded pipe NPS 2 [DN 501 or larger and produced on a
<br /> line of direction of force. During the first step, which is a test hot-stretch-reducing mill shall be tested with a nondestructive
<br /> for ductility of the weld,except as allowed by 7.3.5,7.3.6, and electric test that inpsects the full volume of the pipe in
<br /> !...7, no cracks or breaks on the inside, outside, or end accordance with Practices E213, E309, or E570.
<br /> surfaces at the weld shall be present before the distance 9.1.2 Ultrasonic and Electromagnetic Inspection—Any
<br /> between the plates is less than three fourths of the specified equipment utilizing the ultrasonic or electromagnetic principles
<br /> outside diameter of the pipe. As a second step, the flattening and capable of continuous and uninterrupted inspection of the
<br /> shall be continued as a test for ductility away from the weld. weld seam shall be used.The equipment shall be checked with
<br /> During the second step, except as allowed by 7.3.6 and 7.3,7, an applicable reference standard as described in 9.1. at least
<br /> no cracks or breaks on the inside,outside,or end surfaces away once every working turn or not more than 8 h to demonstrate
<br /> from the weld shall be present before the distance between the its effectiveness and the inspection procedures.Theequipment
<br /> plates is less than 60%of the specified outside diameter of the shall be adjusted to produce well-defined indications whn the
<br /> pipe. During the third step, which is a test for soundness, the reference standard is scanned by the inspection unit in a
<br /> flattening shall be continued until the test specimen breaks or manner simulating the inspection of the product.
<br /> the opposite walls of the test specimen meet. Evidence of 9.1.3 Reference Standards—The length of the reference
<br /> laminated or unsound material or of incomplete weld that is standards shall be determined by the pipe manufacturer, and
<br /> revealed by the flattening test shall be cause for rejection. they shall have the same specified diameter and thickness as
<br /> 7.3.5 Surface imperfections in the test specimen before the product being inspected.Reference standards shall contain
<br /> flattening, but revealed during the first step of the flattening machined notches, one on the inside surface and one on the
<br /> test, shall be judged in accordance with the finish requirements outside surface, or a drilled hole, as shown in Fig. 1, at the
<br /> in Section 12. option of the pipe manufacturer. The notches shall be parallel
<br /> 7.3.6 Superficial ruptures as a result of surface imperfec- to the weld seam,and shall be separated by a distance sufficient
<br /> tions shall not be cause for rejection. to produce two separate and distinguishable signals.The 1/8-in.
<br /> 7.3.7 For pipe with a D-to-t ratio less than 10, because the [3.2-mm] hole shall be drilled through the wall and perpen-
<br /> strain imposed due to geometry is unreasonably high on the dicular to the surface of the reference standard as shown in Fig.
<br /> inside surface at the 6 and 12 o'clock locations, cracks at such 1. Care shall be taken in the preparation of the reference
<br /> locations shall not be cause for rejection. standard to ensure freedom from fins or other edge roughness,
<br /> or distortion of the pipe.
<br /> 8. Hydrostatic Test NOTE 5—The calibration standards shown in Fig. I are convenient
<br /> 8.1 The hydrostatic test shall be applied, without leakage standards for calibration of nondestructive testing equipment.The dimen-
<br /> sions of such standards are not to be construed as the minimum sizes of
<br /> through the weld seam or the pipe body. imperfections detectable by such equipment.
<br /> 8.2 Plain-end pipe shall be hydrostatically tested to the 9.1.4 Acceptance Limits—Table 3 gives the height of accep-
<br /> applicable pressure given in Table X2.2, and threaded-and- tance limit signals in percent of the height of signals produced
<br /> coupled pipe shall be hydrostatically tested to the applicable by reference standards. Imperfections in the weld seam that
<br /> pressure given in Table: X2.3. It shall be permissible, at the produce a signal greater than the acceptance limit signal given
<br /> discretion of the manufacturer, to perform the hydrostatic test in Table 3 shall be considered a defect unless the pipe
<br /> on pipe with plain ends,with threads only, or with threads and manufacturer can demonstrate that the imperfection does not
<br /> couplings; and it shall also be permissible to test pipe in either reduce the effective wall thickness beyond 12.5 % of the
<br /> single lengths or multiple lengths. specified wall thickness.
<br /> Copyright by ASTM Int'l(all rights reserved);Tue Nov 6 09:27:19 EST 2012 4
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