螺旋管检测

1.1 This specification covers seamless copper tube in coils suitable for use in refrigeration and air conditioning or such other uses as oil lines gasoline lines etc.

1.2 The tube will normally be made of the following coppers and unless otherwise specified tubes made from any one of these coppers may be supplied:

1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

This test method is used to determine the effect of exposure to elevated temperatures on the bond strength of combinations of magnet wire insulations and electrical insulating varnishes. The results are used as a guide for the comparison and selection of varnishes and combinations of varnishes and magnet wire insulation for specific applications. Test Methods D 1932 D 3251 and D 3850 describe additional tests for determining the thermal endurance of insulating varnishes. A comprehensive evaluation of thermal characteristics includes a comparison of the thermal endurance determined in these different ways.

This test method is useful for research and product qualifications purposes.

1.1 This test method covers the determination of the thermal endurance of electrical insulating varnishes alone or in combinations with magnet wire insulation. Changes in the helical coil bond strength are used as the test criteria. The coils are made from bare aluminum or copper wire or from film- or fiber-insulated magnet wire.

1.2 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. For a specific precautionary statement see Section 7.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

Note 18212;There is no similar or equivalent IEC standard.

This test method provides a satisfactory means of determining various ac magnetic properties of amorphous magnetic materials.

The procedures described herein are suitable for use by manufacturers and users of magnetic materials for materials specification acceptance and manufacturing control.

The procedures described herein may be adapted for use with specimens of other alloys and other toroidal forms.

1.1 This test method covers tests for various magnetic properties of amorphous materials at power frequencies [25 to 400 Hz] using a toroidal test transformer. The term toroidal test transformer is used to describe the test device reserving the term specimen to refer to the material used in the test. The test specimen consists of toroidally wound flat strip.

1.2 This test method covers the determination of core loss exciting power rms and peak exciting current several types of ac permeability and related properties under ac magnetization at moderate and high inductions at power frequencies [25 to 70 Hz].

1.3 With proper instrumentation and specimen preparation this test method is acceptable for measurements at frequencies from 5 Hz to 100 kHz. Proper instrumentation implies that all test instruments have the required frequency bandwidth. Also see Annex A2.

1.4 This test method also provides procedures for calculating impedance permeability from measured values of rms exciting current and for calculating ac peak permeability from measured peak values of total exciting current at magnetizing forces up to about 10 Oe [796 A/m].

1.5 Explanation of symbols and brief definitions appear in the text of this test method. The official symbols and definitions are listed in Terminology A 340.

1.6 This test method shall be used in conjunction with Practice A 34/A 34M.

1.7 The values and equations stated in customary (cgs-emu and inch-pound) units or SI units are to be regarded separately as standard. Within this standard SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard.

1.8 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.

1.1 This specification covers PTFE tubing miniature beading and spiral cut tubing-manufactured from PTFE resin produced from dispersion specified in Specification D4895.

Note 18212;PTFE tube and rod manufactured from resin specified in Specification D4894 are covered in Specification D1710.

1.2 The values stated in SI units are to be regarded as standard. The inch-pound units given in parentheses are for information only.

1.3 The following hazard caveat pertains only to the test method portion Section 8 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.

1.4 As PTFE resin produced from dispersion is not a true thermoplastic material any reuse for the specification referenced above is impossible. However markets do exist for non-virgin PTFE as additives and fillers.

Note 28212;There is no known ISO equivalent to this standard.