ASTM C159-06 (R2021) pdf free download.Standard Specification for Vitrified Clay Filter Blocks.
1 .1 This specification establishes the criteria for acceptance, prior to installation, of vitrified clay filter block used in trickling filters for the treatment of sewage and industrial wastes.
1 .2 The values stated in inch-pound units are to he regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only
and are not considered standard.
3.2. 1 compressive strength—the pressure, measured in psi (kPa) which causes failure of vitrified clay filter block, with the load being applied to the block in the direction of use.
3.2.2 filter block—rectangular, vitrified clay units with interior drainage channels, having apertures that connect to the drainage channels through the upper surface. The apertures are arranged to form drainage and aeration grilles that pass air into, and liquids from, overlying filtering media. The drainage channels of the filter block provide for the conveyance of the filtered liquid away from the filter bed.
3.2.2.1 Type I-S and Type I-H filter block—one-piece units suitable for constructing a single-course trickling filter floor.
3.2.3 lot—unless otherwise specified. a lot shall consist of all filter block of each type of the contract or purchase order.
3.2.4 waIls—Exterior vertical sides of vitrified clay filter block.
3.2.5 webs—interior supports separating channels of vitrified clay filter block.
4. Classification
4.1 Filter block are manufactured in the following types:
4.1.1 Type 1-S. standard rate and
4.1.2 Type 1-H. high rate.
4.2 The purchaser shall specify the type of filter block to be furnished.
5. Ordering Information
5.1 Orders for filter block under this specification shall include the following information:
5.1.1 Quantity.
5.1.2 Type of filter block,
5.1.3 ASTM designation and date of issue,
5.1.4 Required tests or certification, and
5.1.5 Inspection location: factory or point of delivery.
6. Materials and Manufacture
6.1 Filter block shall be formed from fire clay, shale, surface clay, or a combination of these materials.
6.2 Formed filter block shall be fired to a suitable temperature to yield a product that is strong. durable, and serviceable and conforms to this specification.ASTM C159 pdf download.