Designation standards: ASTM E215-16 Note: WITHDRAWN Publication date standards: 1.12.2016 SKU: NS-673847 The number of pages: 11 Approximate weight : 33 g (0.07 lbs) Country: American technical standard Category:Technical standards ASTM
4.1 The examination is performed by
passing the tube lengthwise through or near an eddy current sensor
energized with alternating current of one or more frequencies. The
electrical impedance of the eddy current sensor is modified by the
proximity of the tube. The extent of this modification is
determined by the distance between the eddy current sensor and the
tube, the dimensions, and electrical conductivity of the tube. The
presence of metallurgical or mechanical discontinuities in the tube
will alter the apparent impedance of the eddy current sensor.
During passage of the tube, the changes in eddy current sensor
characteristics caused by localized differences in the tube produce
electrical signals which are amplified and modified to actuate
either an audio or visual signaling device or a mechanical marker
to indicate the position of discontinuities in the tube length.
Signals can be produced by discontinuities located either on the
external or internal surface of the tube or by discontinuities
totally contained within the tube wall.
4.2 The depth of penetration of eddy
currents in the tube wall is influenced by the conductivity (alloy)
of the material being examined and the excitation frequency
employed. As defined by the standard depth of penetration equation,
the eddy current penetration depth is inversely related to
conductivity and excitation frequency (Note 2). Beyond one standard depth of
penetration (SDP), the capacity to detect discontinuities by eddy
currents is reduced. Electromagnetic examination of seamless
aluminum alloy tube is most effective when the wall thickness does
not exceed the SDP or in heavier tube walls when discontinuities of
interest are within one SDP. The limit for detecting metallurgical
or mechanical discontinuities by way of conventional eddy current
sensors is generally accepted to be approximately three times the
SDP point and is referred to as the effective depth of penetration
(EDP).
Note 2:The standard depth of penetration is defined by the
following equations:
1.1 This practice2 is
for standardizing eddy current equipment employed in the
examination of seamless aluminum-alloy tube. Artificial
discontinuities consisting of flat-bottomed or through holes, or
both, are employed as the means of standardizing the eddy current
system. General requirements for eddy current examination
procedures are included.
1.2 Procedures for fabrication of
reference standards are given in Appendixes X1.1 and X2.1.
1.3 This practice is intended for the
examination of tubular products having nominal diameters up to 4
in. [101.6 mm] and wall thicknesses up to the standard depth of
penetration (SDP) of eddy currents for the particular alloy
(conductivity) being examined and the examination frequency being
used.
Note 1:This practice may also be used for larger diameters or
heavier walls up to the effective depth of penetration (EDP) of
eddy currents as long as adequate resolution is obtained and as
specified by the using party or parties.
1.4 This practice does not establish
acceptance criteria. They must be established by the using party or
parties.
1.5 The values stated in inch-pound units
are to be regarded as the standard. The values given in parentheses
are mathematical conversions to SI units that are provided for
information only and are not considered standard.
1.6This standard does not purport to
address all of the safety problems, 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.
Standard Terminology for Nondestructive
Examinations
NAS-410
NAS Certification and Qualification of
Nondestructive Personnel (Quality Assurance Committee) Available
from Aerospace Industries Association of America, Inc. (AIA), 1000
Wilson Blvd., Suite 1700, Arlington, VA 22209-3928,
http://www.aia-aerospace.org.
SNT-TC-1A
Recommended Practice for Personnel
Qualification and Certification in Nondestructive Testing Available
from American Society for Nondestructive Testing (ASNT), P.O. Box
28518, 1711 Arlingate Ln., Columbus, OH 43228-0518,
http://www.asnt.org.
Fed Std. No.245D
Tolerance for Aluminum Alloy and
Magnesium Alloy Wrought Products Available from Standardization
Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave.,
Philadelphia, PA 19111-5098, http://dodssp.daps.dla.mil.
ISO 9712
ASNT Standard for Qualification and
Certification of Nondestructive Testing Personnel
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