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定价： 358元 / 折扣价： 319 元 加购物车

定价： 358元 / 折扣价： 319 元 加购物车

定价： 358元 / 折扣价： 319 元 加购物车

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8.1 This specification provides guidelines for the selection of a generic vault, in accordance with its intended use.8.2 This specification is intended to assist users in availing themselves of various generically constructed products, while maintaining consistency with their selected intrusion-resistance level.8.3 This specification is not meant to recommend or prefer the use of any single product, any type level, or its application.AbstractThis specification is for the use and guidance of those who purchase, design, construct, install, approve, or modify generic vault structures intended for protection of valuables against loss due to forced entry. It also includes the descriptions of terms, classifications, materials, practices, and methods to be followed in constructing, fabricating, or modifying intrusion resistant generic vaults. The vault shall be rated as a unit and that rating shall be determined by the component having the lowest classification. The walls, floor, and ceiling of a vault shall be formed or composed of materials without “true” joints or seams, with the exception of “cold” concrete seams necessitated by construction technique. Components of a building shall not be used as part of the vault unless constructed to provide the equivalent intrusion resistance. The vault enclosure shall be classified into four types: Type M, Type 1, Type 2, and Type 3. Materials to be used in the construction of vault structures shall include concrete, concrete reinforcements, conduit, and grout.1.1 This specification is for the use and guidance of those who purchase, design, construct, install, approve, or modify generic vault structures intended for protection of valuables against loss due to forced entry.1.2 This specification includes the descriptions of terms, classifications, materials, practices, and methods to be followed in constructing, fabricating, or modifying intrusion resistant generic vaults.1.3 This specification does not address fire resistivity, nor does it address modular panels.1.4 This specification is not intended to prevent the use of systems, methods, or devices that provide a level of intrusion resistance equivalent or better than that prescribed herein. Any system, method, or device different from that detailed herein may be examined, in accordance with the intent of this specification, and if found to be equivalent or better, may be included.1.5 Nothing in this specification shall be construed to prohibit better or safer conditions than the requirements specified herein.1.6 Materials and construction details outlined in this specification are intended to detail protective requirements necessary to achieve the required level of intrusion resistance, and are not intended to address structural soundness or operational fitness, areas for which the project engineer, architect, or equipment supplier are responsible.1.7 Each referenced document cited in Section 2 shall be meant to be the edition in effect on the date this specification was published.NOTE 1: A rationale is given in Appendix X1.1.8 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.1.9 The following precautionary statement pertains to the test method portion only, Section 9, 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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3.1 In this test method, susceptibility to localized corrosion of aluminum is indicated by a protection potential (Eprot) determined by cyclic galvanostaircase polarization (1). The more noble this potential, the less susceptible is the alloy to initiation of localized corrosion. The results of this test method are not intended to correlate in a quantitative manner with the rate of propagation of localized corrosion that one might observe in service.3.2 The breakdown (Eb), and protection potentials (Eprot) determined by the cyclic GSCP method correlate with the constant potential corrosion test (immersion-glassware) result for aluminum (1, 6, 7). When the applied potential was more negative than the GSCP Eprot, no pit initiation was observed. When the applied potential was more positive than the GSCP Eprot, pitting occurred even when the applied potential was less negative than Eb.3.2.1 Severe crevice corrosion occurred when the separation of Eb and Eprot was 500 mV or greater and Eprot was less than −400 mV Vs. SCE (in 100 ppm NaCl) (1, 6, 8). For aluminum, Eprot determined by cyclic GSCP agrees with the repassivation potential determined by the scratch potentiostatic method (1, 9). Both the scratch potentiostatic method and the constant potential technique for determination of Eprot require much longer test times and are more involved techniques than the GSCP method.3.3 DeBerry and Viebeck (3-5) found that the breakdown potentials (Eb) (galvanodynamic polarization, similar to GSCP but no kinetic information) had a good correlation with the inhibition of localized corrosion of 304L stainless steel by surface active compounds. They attained accuracy and precision by avoiding the strong induction effect which they observed by the potentiodynamic technique.3.4 If this test method is followed using the specific alloy discussed it will provide (GSCP) measurements that will reproduce data developed at other times in other laboratories.3.5 Eb and Eprotobtained are based on the results from eight different laboratories that followed the standard procedure using aluminum alloy 3003-H14 (UNS A93003). Eb and Eprot are included with statistical analysis to indicate the acceptable range.1.1 This test method covers a procedure for conducting cyclic galvanostaircase polarization (GSCP) to determine relative susceptibility to localized corrosion (pitting and crevice corrosion) for aluminum alloy 3003-H14 (UNS A93003) (1).2 It may serve as guide for examination of other alloys (2-5). This test method also describes a procedure that can be used as a check for one's experimental technique and instrumentation.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 加购物车

5.1 The availability of a standard procedure, standard material, and standard plots should allow the investigator to check his laboratory technique. This practice should lead to electrochemical impedance curves in the literature which can be compared easily and with confidence.5.2 Samples of a standard ferritic type 430 stainless steel (UNS 430000) used to obtain the reference plots are available for those who wish to check their equipment. Suitable resistors and capacitors can be obtained from electronics supply houses.5.3 This test method may not be appropriate for electrochemical impedance measurements of all materials or in all environments.1.1 This practice covers an experimental procedure which can be used to check one's instrumentation and technique for collecting and presenting electrochemical impedance data. If followed, this practice provides a standard material, electrolyte, and procedure for collecting electrochemical impedance data at the open circuit or corrosion potential that should reproduce data determined by others at different times and in different laboratories. This practice may not be appropriate for collecting impedance information for all materials or in all environments.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 646元 加购物车

定价： 515元 加购物车