This specification outlines the standards for fabricated PVC-U bends with a 22.5° angle, designed for potable water distribution systems. It covers manufacturing dimensions, pressure classifications, marking protocols, and material criteria consistent with IS 4985 for unplasticized PVC pipes, ensuring reliable quality and performance for fittings used in water supply networks.
Overview
This specification outlines the standards for fabricated PVC-U bends with a 22.5° angle, designed for potable water distribution systems. It covers manufacturing dimensions, pressure classifications, marking protocols, and material criteria consistent with IS 4985 for unplasticized PVC pipes, ensuring reliable quality and performance for fittings used in water supply networks.
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Frequently Asked
The dimensional details for 22.5° bends are provided in two tables: one for plain-ended bends and another for bends with elastomeric sealing ring joints. These tables, together with their respective figures, specify key parameters such as outside diameter, wall thickness, bend radius, and bend length. Typically, the bend radius is three times the nominal outside diameter, and lengths and thicknesses vary depending on pressure class and nominal size. For elastomeric sealing ring bends, additional dimensional criteria apply to ensure proper sealing and fit.
Per the standard, each 22.5° bend must carry markings including the manufacturer's identification, size, pressure class according to IS 4985, and the bend angle. Pressure classes are visually distinguished by color codes: blue for 0.4 MPa (Class 2), green for 0.6 MPa (Class 3), brown for 0.8 MPa (Class 4), yellow for 1.0 MPa (Class 5), black for 1.25 MPa (Class 6), and pink for plumbing applications. This system facilitates quick recognition and compliance verification during installation and inspection.
The fittings must be made from unplasticized polyvinyl chloride (PVC-U) conforming to IS 4985 for potable water pipes. Fabrication processes must ensure precise dimensions, consistent wall thickness, and smooth internal surfaces to maintain flow efficiency and hygiene. Production should follow quality assurance procedures outlined in IS 10124 Part 1, including appropriate fusion or solvent welding, dimensional verification, and traceable marking to guarantee durability and safety in potable water applications.
Yes, the standard specifies particular dimensional requirements for 22.5° bends equipped with elastomeric sealing ring joints. These are detailed in Table 2 and illustrated in Figure 2 within the standard. The design ensures adequate sealing performance and mechanical integrity under angular deflection, and dimensions such as minimum bend radius, offset length, and plain end length differ from those of standard plain-ended bends to accommodate the sealing ring components.
IS 10124 Part 12 complements IS 4985 by specifying fabricated PVC-U fittings such as 22.5° bends, while IS 4985 governs unplasticized PVC pipes for potable water. The dimensions, pressure classes, and material requirements in IS 10124 Part 12 are harmonized with IS 4985 to ensure compatibility and uniform performance across piping systems. This alignment guarantees that fittings and pipes work seamlessly together for safe and reliable potable water distribution.
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