Glazed Fire-Clay Sanitary Appliances, Part 7: Specific Requirements of Slop Sinks
1981 Edition

Based on IS 771 Part 7 (1981), the specified sizes for glazed fire-clay slop sinks are as follows:

• Wall-mounted type: approximately 610 mm in width by 530 mm in depth, as depicted in Figure 1.
• Floor-mounted type: around 430 mm in width by 460 mm in depth, shown in Figure 2.

Tolerance limits are defined as ±4% for dimensions equal to or exceeding 50 mm, and ±2 mm for dimensions below 50 mm. Wall-mounted models include an integral trap with outlet as per Figure 1, while floor-mounted versions feature an integral trap with P or S outlet configurations per Figure 2.

The standard mandates that glazed fire-clay slop sinks must be constructed using high-quality glazed fire-clay material to ensure durability and maintain hygiene. They should comply with specified patterns and sizes, maintaining strict dimensional tolerances to guarantee proper fitting. The sinks must have a smooth glazed surface to facilitate cleaning and prevent dirt buildup, with rounded edges to avoid accumulation of contaminants. Additionally, the thickness and structural integrity should be sufficient to withstand typical usage stresses, ensuring longevity and functionality.

IS 771 Part 7 specifies tolerance ranges based on the size of the dimension: for any measurement 50 mm or larger, a tolerance of ±4% of the stated dimension is allowed; for dimensions smaller than 50 mm, a fixed tolerance of ±2 mm is permitted. For example, a 610 mm dimension would have an allowable deviation of ±24.4 mm, while a 40 mm dimension would allow ±2 mm variation. These tolerances ensure consistent manufacturing quality and interchangeability.

The standard requires that every slop sink be clearly and permanently marked at a visible and accessible location even after installation. The marking must include the manufacturer’s name or trademark to ensure traceability and quality assurance. This identification aids in verifying compliance and facilitates product authentication throughout its lifecycle.

Yes, IS 771 Part 7 outlines that slop sinks must be constructed as a single piece with either a boxed or open type flushing rim. Boxed rims need to have adequate perforations on all sides to enable effective flushing. The rim should also include an inlet or supply horn designed to match the dimensions shown in the relevant figures for proper connection to flush pipes. Regarding trap design, wall-mounted sinks must have an integral trap with an outlet as per Figure 1, while floor-mounted sinks require an integral trap featuring P or S type outlets according to Figure 2. Interior surfaces must be smooth and consistent, with serrated outlet areas left unglazed externally to ensure efficient flow and prevent blockages.