The 1982 edition of IS 1795 outlines the standards for pillar taps used in water supply installations, emphasizing their material composition, dimensional accuracy, and performance criteria to guarantee durability and compatibility. This standard primarily serves manufacturers, suppliers, and quality assurance professionals involved in the production and testing of taps for wash basins and related fittings.
Overview
The 1982 edition of IS 1795 outlines the standards for pillar taps used in water supply installations, emphasizing their material composition, dimensional accuracy, and performance criteria to guarantee durability and compatibility. This standard primarily serves manufacturers, suppliers, and quality assurance professionals involved in the production and testing of taps for wash basins and related fittings.
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Frequently Asked
IS 1795 (1982) prescribes specific materials for various parts of pillar taps to ensure quality and longevity. The body, capstan head, and washer plate are to be made from either cast brass or leaded tin bronze conforming to relevant Indian Standards such as IS:292-1961 and IS:1264-1981. Components like the spindle, gland, washer plate, and nuts should utilize brass rods or brass of specified grades per IS:319-1974 and IS:3488-1980. Additionally, washer materials must comply with IS 4346-1982, and nickel-chromium plating is mandated as per Service Grade No. 2 of IS 4827-1968 for corrosion protection and finish.
According to Clause 6.3.1 and Table 4 of IS 1795, the bonnet and gland components have defined dimensional limits. External threads on the bonnet flange are specified as M30 × 1 for 15 mm and M39 × 1.5 for 20 mm sizes without stated tolerances. Minimum thread lengths, recess depths, and flange thicknesses are detailed, such as a minimum 11.1 mm thread length on the bonnet for 15 mm taps and a maximum recess length of 4.2 mm. The spindle is required to extend at least 0.7 mm beyond the bonnet face when fully opened, and precise hole diameters for spindle passage are also mandated.
IS 1795 adopts ISO metric screw thread standards (per IS:4218) for all pillar tap components to maintain compatibility and quality. The threads differ by component and nominal tap size (15 mm and 20 mm), with internal and external threads specified for body, bonnet, stuffing box, gland, and spindle. For instance, the 15 mm body internal thread is M24 × 1.5 with medium tolerance, while the spindle external thread is M14 × 2 with a coarse pitch. The standard defines pitch classes such as medium (m), fine (f), and coarse (c), ensuring precise fitting and interchangeability among parts.
To confirm compliance with hydraulic pressure standards in IS 1795, pillar taps undergo a pressure test at 2 MPa (20 kgf/cm²) maintained for 2 minutes, during which no leaks or sweating are permitted. Samples for this test are drawn from pre-approved batches as per sampling procedures. Prior to testing, components like washer plates and washers are removed, and care is taken to protect gland packing from plating damage to ensure accurate results. Failure of any tap in the test sample results in non-acceptance of the batch.
IS 1795 allows pillar taps to be marked with the ISI Certification Mark, which serves as confirmation that the product adheres to the Indian Standard through rigorous inspection, testing, and quality control overseen by the Indian Standards Institution. Manufacturers must obtain a license to apply this mark, governed by the Indian Standards Institution (Certification Marks) Act. The ISI mark signifies continuous compliance and ensures the product meets all material, workmanship, and dimensional requirements set forth in the standard.
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