1.1 这些试验方法包括测定蒸汽发生器管传热表面上每单位面积水侧沉积物的重量。包括以下测试方法: 小节 试验方法A——用刮刀或振动工具机械去除沉积物重量法 7. 到 16 试验方法B——用溶剂管重量损失法去除化学物质 17 到 27 试验方法C-用玻璃珠喷砂管重量损失法进行机械去除 28 到 37 1.2 试验方法A通常适用于1至100 g/ft的沉积物 2. 在协作研究中确定的精度范围为16至76 克/英尺 2. 该程序允许自由选择待取样管上的区域。去除的沉积物允许进行进一步的化学分析。 1.3 试验方法B通常适用于1至100 g/ft的沉积物 2. 精度在一项协作研究中确定，范围为28至73 克/英尺 2. 该程序平均了较重和较轻的沉积区域。产生的溶剂溶液允许进一步的化学分析。 1.4 试验方法C通常适用于1至100 g/ft的沉积物 2. 精度在一项合作研究中确定，范围为17至88 克/英尺 2. 该程序平均了较重和较轻的沉积区域。去除的沉积物不允许进行进一步的化学分析。 1.5 这些试验方法通常针对蒸汽发生器管传热表面上常见的水侧沉积物类型进行评估。用户有责任确保这些测试方法对其他类型的沉积物或高温水垢的有效性。 1.6 这些方法有时用于内螺纹蒸汽发生器管中的累积沉积。经验表明，某些内螺纹蒸汽发生器管上的凹槽和焊盘上的沉积存在显著差异。 凹槽已显示出可容纳更多沉积物。测试方法B和测试方法C将平均该差值。在方法A中，如果目测确定沉积更为严重，则可以选择从凹槽中去除沉积物，或者在凹槽和平台上均匀去除沉积物。重要的是要了解所做的选择，并且报告反映了在对内螺纹蒸汽发生器管使用测试方法A时所做的决定。 1.7 在一些蒸汽发生器管中，很明显有一半的管从外观上暴露在火焰中，这一侧通常被称为火侧或热侧。管的另一半不暴露于火焰中，其外观通常称为外壳侧或冷侧。这些测试方法还要求将管子一分为二，因此管子通常沿着这些线分开。在这些管上，通常发现在火侧或热侧存在更多的内部沉积。 这些方法的一些用户将仅在视觉上显示存在更多沉积的一侧确定沉积。一些用户将确定双方的沉积并分别报告结果，一些用户将对两个结果进行平均。重要的是，数据用户应了解所做的选择，并且结果报告应具体。 1.8 以国际单位制或英寸磅单位表示的值应视为标准值。括号中给出的值仅供参考。 1.9 本标准并不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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.10 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 单位面积测量的重量表示锅炉的相对清洁度或脏度。它用于确定锅炉化学处理程序的有效性，并确定是否需要对锅炉系统进行化学清洗。允许内部沉积物不受控制地堆积，可能会导致锅炉管因沉积物不足腐蚀和管金属过热而失效。

1.1 These test methods cover the determination of the weight per unit area of waterside deposits on heat-transfer surfaces of steam generator tubes. The following test methods are included: Sections Test Method A—Mechanical removal by scraper or vibrating tool-removed deposit weight method 7 to 16 Test Method B—Chemical removal by solvent-tube weight loss method 17 to 27 Test Method C—Mechanical removal by glass-bead blasting-tube weight loss method 28 to 37 1.2 Test Method A is a procedure generally applicable to deposits ranging from 1 to 100 g/ft 2 . The precision was determined in the collaborative study over the range of 16 to 76 g/ft 2 . This procedure allows the discretionary selection of the area on the tube to be sampled. The removed deposit allows for further chemical analysis. 1.3 Test Method B is a procedure generally applicable to deposits ranging from 1 to 100 g/ft 2 . The precision was determined in a collaborative study over the range of 28 to 73 g/ft 2 . The procedure averages out the heavier and lighter deposited areas. The solvent solution produced allows for further chemical analysis. 1.4 Test Method C is a procedure generally applicable to deposits ranging from 1 to 100 g/ft 2 . The precision was determined in a collaborative study over the range of 17 to 88 g/ft 2 . The procedure averages out the heavier and lighter deposited areas. The removed deposit does not allow for further chemical analysis. 1.5 These test methods have been generally evaluated on the types of waterside deposits generally found on heat-transfer surfaces of steam generator tubes. It is the user’s responsibility to ensure the validity of these test methods for other types of deposits or high temperature scale. 1.6 These methods are sometimes used for accumulated deposition in rifled steam generator tubes. Experience has shown that there is a significant difference in the deposition in the grooves and on the lands on some rifled steam generator tubes. The grooves have been shown to hold more deposit. Test Method B and Test Method C will average out this difference. In Method A the choice exists, either to choose to remove the deposition from the groove if it is visually determined to be more heavily deposited, or to remove equally over the grooves and lands. It is important that it be understood what choices were made and that the report reflect the choices made when using Test Method A on rifled steam generator tubes. 1.7 There are some steam generator tubes where it is apparent that half of the tube is exposed to the flame from the external appearance, this side is typically called the fireside or hot side. The other half of the tube is not exposed to the flame from the external appearance is typically called the casing side or cold side. These test methods also require that the tube be split in half, so the tube is generally split along these lines. On these tubes it is generally found that more internal deposition exists on the fireside or hot side. Some users of these methods will determine the deposition only on side where it appears visually that more deposition exists. Some users will determine the deposition on both sides and report the results separately and some will average the two results. It is important that the user of the data be aware of the choices made and that the report of the results be specific. 1.8 The values stated in either SI or inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 1.9 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. ====== Significance And Use ====== 4.1 The weight per unit area measurement is an indication of the relative cleanliness or dirtiness of the boiler. It is used to determine the effectiveness of the boiler chemical treatment program and to determine the need for chemically cleaning the boiler systems. Allowing the internal deposition to accumulate unchecked will likely lead to boiler tube failures by mechanisms of under deposit corrosion and tube metal overheating.