1.1 本试验方法涵盖了金属上玻璃涂层可靠性的测定，适用于设计用于承受高度腐蚀条件的设备制造商，在这种条件下，涂层在使用中的故障会对暴露的金属造成极端损坏。不鼓励在制造商工厂外使用，因为不适当或不分青红皂白的测试可能会导致穿孔，如果不将设备返回制造商工厂，则很难进行维修。该测试方法不仅可以检测玻璃涂层中存在的不连续性，还可以检测玻璃薄到可能导致使用中过早失效的区域。 1.2 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。有关具体的预防说明，请参阅第节 7. 。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 玻璃钢设备在高腐蚀性化学工艺中的广泛使用使得有必要在使用中发生灾难性故障之前检测涂层中的薄弱点并进行修复。本试验旨在检测金属上玻璃涂层的不连续性和薄区域，以确保涂层无缺陷，并具有足够的厚度以承受规定的使用条件。 测试电压可以选择在高达20kV的任何期望值，从而使测试适用于广泛的厚度要求。当由于气泡或缺陷，任何位置的玻璃厚度都不足以承受所施加的电压时，就会出现穿孔，并伴有缺陷迹象。然后需要采取补救措施来修复缺陷，然后才能将设备用于腐蚀性服务。（当在设备离开制造商工厂之前发现此类缺陷时，通常可以涂覆并烧制另一层玻璃，使其成为涂层的组成部分。）

1.1 This test method covers the determination of the reliability of glass coating on metal and is intended for use by manufacturers of equipment that is designed to withstand highly corrosive conditions where a failure of the coating in service would cause extreme damage to the exposed metal. Its use outside the manufacturer's plant is discouraged because improper or indiscriminate testing can cause punctures that are difficult to repair without returning the equipment to the manufacturer's plant. This test method detects not only existing discontinuities in the glass coating, but also areas where the glass may be thin enough to be likely to result in premature failure in service. 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. For specific precautionary statements, see Section 7 . 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. ====== Significance And Use ====== 4.1 The widespread use of glassed-steel equipment in highly corrosive chemical processes has made it necessary to detect weak spots in the coating and repair them before catastrophic failure occurs in service. This test is intended to detect discontinuities and thin areas in a glass coating on metal to ensure that the coating is defect free and has sufficient thickness to withstand the prescribed service conditions. A test voltage may be selected at any desired value up to 20k V, thus making the test applicable to a wide range of thickness requirements. When, because of bubbles or defects, the thickness of glass at any spot is less than enough to withstand the applied voltage, a puncture results with an accompanying indication of a defect. Remedial action is then required to repair the defect before the equipment can be used for corrosive service. (When such defects are found before the equipment leaves the manufacturer's plant another application of glass can usually be applied and fired to become an integral part of the coating.)