1.1 本规程涵盖了计算硫酸钡、硫酸锶和二水硫酸钙（石膏）在微咸水、海水和盐水中的过饱和度，其中钡、锶和钙离子在硫酸根离子存在的情况下共存或单独存在于溶液中。 1.2 如果调查盐水的温度超过95°C，则本规程不适用于计算二水硫酸钙过饱和度。在95°C以上的温度下，半硬石膏和硬石膏将是主要的不溶形式。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.5 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《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 本规程涵盖了工业操作中发现的三种主要硫酸盐结垢化合物过饱和度的数学计算。然而，将本标准规程应用于给定系统中的结垢预测需要经验。计算告诉用户水或水混合物是否处于缩放模式。事实上，规模是否会形成，形成的速度有多快，在哪里形成，形成的数量和组成取决于本实践范围以外的因素。 然而，根据给定水或水混合物的过饱和程度，可以对水垢形成的相对可能性进行客观评估。 注1: 有几种商用和公开的个人计算机（PC）类型的程序将执行这些计算。

1.1 This practice covers the calculation of supersaturation of barium sulfate, strontium sulfate, and calcium sulfate dihydrate (gypsum) in brackish water, seawater, and brines in which barium, strontium, and calcium ions either coexist or exist individually in solution in the presence of sulfate ions. 1.2 This practice is not applicable for calculating calcium sulfate dihydrate supersaturation if the temperatures of saline waters under investigation exceed 95°C. At temperatures above 95°C, hemianhydrate and anhydrite would be major insoluble forms. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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 This practice covers the mathematical calculation of the supersaturation of three principal sulfate scaling compounds found in industrial operations. Application of this standard practice to the prediction of scale formation in a given system, however, requires experience. The calculations tell the user if a water, or mixture of waters, is in a scaling mode. Whether or not scale will in fact form, how quickly it will form, where it will form, in what quantities, and what composition are subject to factors beyond the scope of this practice. However, based on how supersaturated a given water or mixture of waters is, an objective evaluation of the relative likelihood of scale formation can be made. Note 1: There are several personal computer (PC) type programs that are both available commercially and publicly that will perform these calculations.