IS 10313:1982 is the Indian Standard (BIS) for requirements for settling tank (clarifier equipment) for water treatment plant. This standard specifies the requirements for the design, materials, fabrication, and testing of settling tank (clarifier) equipment used in water treatment plants. It covers both circular and rectangular clarifiers, including their mechanical components like scraper mechanisms, drives, and launders.
Requirements for settling tank (clarifier equipment) for water treatment plant
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Scraper Peripheral Speed | 1.5 to 3.5 m/min | 1.2 to 3.0 m/min (equivalent to 2-5 cm/s, a typical design range) | Common US/EU Design Practice |
| Tank Floor Slope (for mechanical scrapers) | Not less than 8% (1:12.5) (via reference to IS 7208) | Slope of at least one to twelve (1:12) | Ten States Standards (2022) |
| Drive Unit Torque Overload Setting | Device to be set at 150 to 200 percent of normal running torque | Alarm at ~150%, trip at ~200% of normal operating torque | Common US/EU Design Practice |
| Material Specification for Wetted Parts | Prescribed as Mild Steel (e.g., IS 226) or Cast Iron with protective coating. | Any material (e.g., coated steel, SS, aluminum) certified to not leach harmful contaminants. | ANSI/NSF 61 |
| Surface Overflow Rate (Plain Sedimentation) | 20 - 30 m³/m²/day (as per CPHEEO Manual, which guides design for IS equipment) | < 29 m³/m²/day (equivalent to < 0.5 gpm/ft²) | Common US Design Practice (AWWA) |
| Weir Loading Rate | < 300 m³/day per meter of weir length (as per CPHEEO Manual) | Shall not exceed 248 m³/day per meter of weir length (20,000 gpd/ft) | Ten States Standards (2022) |