Unplasticized PVC Pipes for Use in Suction and Delivery Lines of Agricultural Pump Sets
2009 Edition

IS 10124 Part 13 prescribes the dimensions for 11¼° PVC-U bends as follows: dimensions for standard bends must conform to Table 1 and Figure 1, while bends designed for elastomeric sealing ring joints must follow Table 2 and Figure 2. The standard specifies parameters such as bend radius, pipe diameter, length, and wall thickness. Both plain end and elastomeric sealing ring joint types are included. Exact measurements can be found in the respective tables and figures within the standard.

The standard encompasses pressure ratings ranging from 0.4 MPa (Class 2) up to 1.25 MPa (Class 6). Each nominal pipe size corresponds to minimum wall thicknesses that increase with pressure class. For instance, a 50 mm nominal pipe requires a minimum wall thickness of 1.0 mm at 1.0 MPa and 1.3 mm at 1.25 MPa for plain end bends. Elastomeric sealing ring joint bends have slightly different thickness requirements detailed in Table 2 of the standard. The minimum bend radius is specified as three times the nominal outside diameter.

Per Clause 4.1 of IS 10124 Part 13, each 11¼° bend must bear markings that include the manufacturer's identification, the size and pressure class as per IS 4985, and the bend angle. Additionally, color codes are used to indicate pressure class: Blue for Class 2 (0.4 MPa), Green for Class 3 (0.6 MPa), Brown for Class 4 (0.8 MPa), Yellow for Class 5 (1.0 MPa), Black for Class 6 (1.25 MPa), and Pink for plumbing applications. This facilitates easy recognition and ensures correct usage.

Yes, the bends can be used with elastomeric sealing ring joints, provided they meet the dimensional requirements specified in Table 2 and Figure 2 of IS 10124 Part 13. These dimensions differ from those for bends without sealing rings (Table 1 and Figure 1) to accommodate the sealing ring geometry. The design ensures leak-proof joints and mechanical integrity under pressure. Proper adherence to these specifications is essential for reliable performance.

Manufacture and quality assurance must adhere to the general provisions outlined in IS 10124 Part 1, which include material specifications, dimensional tolerances, mechanical and hydraulic testing, sampling protocols, and acceptance criteria. Specific fittings such as caps and threaded adaptors have additional requirements detailed within Part 13 clauses but must align with Part 1 standards. Strict compliance ensures that fittings meet durability, safety, and performance benchmarks.

IS 10124 Part 13 complements IS 4985 by specifying fabricated PVC-U fittings, such as 11¼° bends, designed to be fully compatible with the pipes defined in IS 4985. The sizes, pressure classes, and performance criteria are harmonized to ensure seamless integration of pipes and fittings within potable water systems, maintaining uniform quality and function across the piping network.

Yes, bends may have plain ends or socketed ends on one or both sides, depending on the agreement between the manufacturer and purchaser as per Clause 3.2.3. Socket dimensions must comply with IS 10124 Part 1 standards. For pressure class 0.25 MPa, bends should not be made from 0.25 MPa pipes but from 0.4 MPa class pipes to ensure adequate strength. There are no detailed provisions for socket specifics or threaded adaptors in this part beyond these instructions.