copper alloy waste fittings for wash basins and sinks
1979 Edition

IS 2963 (1979) defines requirements for copper alloy waste fittings but does not explicitly list specific copper alloys within the provided content. Generally, commonly used copper alloys in such fittings include brass (copper-zinc alloy), bronze (copper-tin alloy), and copper-nickel alloys, chosen for their corrosion resistance and mechanical properties. The standard emphasizes compliance with related Indian Standards such as IS 771 and IS 2556 for detailed material specifications to ensure durability and suitability for sanitary applications.

According to IS 2963, the nominal sizes for waste fittings are 32 mm for wash basins and 50 mm for sinks. The external thread on the fitting's body and the internal thread on the nut adhere to IS 554-1975, which covers pipe threads for pressure-tight joints. These dimensions ensure proper fit and function with the respective sanitary fixtures.

IS 2963 mandates that waste fittings must be free from defects such as laps, blow-holes, pitting, and any burnt, plugged, stopped, or patched areas in the case of castings. Surfaces should be smooth, clean, and neatly finished, with both body and nut accurately machined to ensure smooth operation. Sampling and acceptance criteria are defined based on lot size, with specific sample sizes and allowable defective counts to determine whether a lot is accepted, rejected, or requires further sampling for quality assurance.

Each waste fitting must be marked with the manufacturer's name or trademark and the year of manufacture. Additionally, the fitting may bear the BIS Standard Mark, which signifies conformity with the Indian Standard and compliance with quality control supervised by BIS. This marking ensures traceability and certification of manufacturing standards.

IS 2963 specifies a two-stage sampling approach based on lot size, with sample sizes and acceptance/rejection numbers detailed in a table. The first sample is inspected for defects; if the number of defectives is less than or equal to the acceptance number, the lot is approved. If defects equal or exceed the rejection number, the lot is rejected. If defectives fall between these two thresholds, a second sample is tested and combined results are evaluated to make a final decision. All test values are rounded off following IS 2:1960 guidelines to maintain consistency.