1.1本规程描述了一种现场程序，用于确定安装在航空燃料处理系统地面过滤装置中的罐式或袋式粘土元件是否超过粘土的使用寿命。 1.2现场程序利用试验方法D3948的装置定期测试安装在粘土处理容器周围侧流中的小粘土胶囊，该粘土处理容器接收固定比例的相同燃料，该燃料流经容器中的粘土元素。 1.3以国际单位制表示的数值应视为标准值。括号中的英寸-磅单位仅供参考。 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 粘土元素广泛用于航空燃料处理系统，以吸附油轮、驳船或管道从炼油厂到码头、机场或两者的运输过程中拾取的极性污染物。其中一些污染物（如表面活性剂）会干扰从燃油中去除水分的过滤分离器的有效运行。 为了确定粘土元素是否耗尽，有必要经常测试粘土处理容器内外的燃料。当质量没有改善时，必须更换粘土元素。除非经常进行，否则此类测试可能无法及时披露失效的粘土处理容器，以防止下游过滤器/分离器出现故障。 为了避免此类故障，使用含有已知表面活性剂的参考燃料定期评估侧流装置中粘土支架中的粘土样品，侧流装置接收与主流流量成比例的流量。当通过试验方法D 3948测定参考燃料的额定值时 表明胶囊粘土已耗尽，主过滤容器中的元素已准备好更换。

1.1 This practice describes a field procedure to determine whether the useful life of the clay has been exceeded in canister or bag-type clay elements that are installed in ground filtration units of aviation fuel handling systems. 1.2 The field procedure utilizes the apparatus of Test Methods D3948 to periodically test a small clay capsule installed in a sidestream around a clay treatment vessel that receives a fixed ratio of the same fuel that flows through the clay elements in the vessel. 1.3 The values stated in SI units are to be regarded as standard. The inch-pound units in parentheses are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== Clay elements are widely used in aviation fuel handling systems to adsorb polar contaminants that are picked up in shipments by tanker, barge, or pipeline from refineries to terminals, airports, or both. Some of these contaminants such as surfactants interfere with efficient operation of filter-separator units that remove water from fuel. In order to determine whether the clay elements are spent, it is necessary to test fuel both into and out of clay treatment vessels frequently. Clay elements must be changed when no improvement in quality is noted. Unless carried out frequently, such testing may not disclose a deactivated clay treatment vessel in time to prevent failure of downstream filter/separators. To avoid such failures, a small sample of clay in a clay holder contained in a sidestream installation that receives flow proportional to the main stream flow is evaluated periodically using a reference fuel containing a known surfactant. When the rating of the reference fuel by Test Method D 3948 indicates that the capsule clay is becoming spent, the elements in the main filter vessel are ready for change.