AWWA B100:2016 pdf download.Granular Filter Material
1. Filter anthracite shall consist of hard, durable anthracite coal particles of various sizes. Blending of nonanthracite material to meet any portion of this standard is not acceptable.
2. The anthracite shall have a Mohs’ hardness greater than 2.7, and specifc gravity and acid solubility as indicated in Table 1.
3. The anthracite shall be visibly free of shale, clay, and other extraneous debris.
Note: Testing for shale, clay, and other extraneous debris is normally not nec- essary. However, if deleterious materials are noticeable, the anthracite shall be within the following limits: (1) a maximum of 1 percent minus No. 200 (0.074 mm) mate- rial by washing, as determined by ASTM C117; and (2) a maximum of 0.5 percent organic impurities, such as wood timber, roots, or twigs, as determined by ASTM C123 for lightweight pieces in aggregate (except dry basis is used, not saturated sur- face dry, and the foat is removed immediately) using a liquid with a 1.0 specifc gravity.
4.1.1.3 High-density sand.
1. High-density sand shall consist of hard, durable, dense grain garnet, ilmenite, hematite, magnetite, or associated minerals of those ores that will resist degradation during handling and use, and shall be made up of at least 95 percent of the associated material.
2. The high-density media shall have specifc gravity and acid solubility as indicated in Table 1.
3. The high-density sand shall be visibly free of clay, dust, and micaceous and organic matter.
Note: Testing for clay, dust, and micaceous and organic matter is normally not necessary. However, if deleterious materials are noticeable, the media shall be within the following limits: (1) a maximum of 2 percent minus No. 200 (0.074 mm) mate- rial by washing, as determined by ASTM C117; and (2) a color not darker than the standard color in ASTM C40 for organic impurities in fne aggregate.
The efective size as defned in Section 3, item 4, and the uniformity coef- fcient as described in Section 3, item 14, shall be as required in the purchase docu- ment. When defning fne media efective size, a plus and minus tolerance range shall be allowed to account for sampling, testing, and test repeatability variances.AWWA B100 pdf download.