Injection Moulded/Machined High-Density Polyethylene (HDPE) Fittings for Potable Water Supplies, Part 9: Specific Requirements for Ends Caps
2003 Edition

IS 8008 Part 9 mandates that HDPE end caps for potable water must be manufactured from high-density polyethylene that meets the material specifications outlined in IS 8008 Part 1. The material grade should satisfy the physical and chemical property requirements ensuring suitability for drinking water applications. The end caps cover nominal sizes from 20 mm to 250 mm and are produced by injection moulding, with machining applied as needed to meet dimensional standards. This guarantees durability, safety, and dimensional precision for potable water fittings.

As per IS 8008 Part 9, HDPE end caps with nominal diameters ranging from 20 mm to 250 mm should be manufactured primarily through injection moulding. Where necessary, machining processes are employed to achieve precise dimensional tolerances. This combination of manufacturing techniques ensures the end caps conform to the material and quality requirements specified in IS 8008 Part 1, thereby guaranteeing consistent quality suitable for potable water supply systems.

IS 8008 Part 9 prescribes detailed dimensional requirements for HDPE end caps sized between 20 mm and 250 mm. The end caps are injection moulded and machined if necessary to meet these criteria. Typical tolerances include an outside diameter variance of approximately ±0.5 mm for smaller sizes, increasing slightly for larger diameters, wall thickness deviations within ±10% of nominal, and length tolerances ranging from ±1 mm to ±2 mm depending on size. For exact dimensions and tolerances, refer to the tables provided within the standard.

According to IS 8008 Part 9, each HDPE end cap must carry clear and durable markings indicating the manufacturer's identification, the size of the fitting, the material grade, and the applicable pressure class or working pressure. Additionally, the end caps may bear the BIS Standard Mark if certified. Markings should be positioned prominently to ensure traceability, verification of material, and confirmation of pressure rating compliance.

The IS 8008 Part 9 standard does not explicitly address welding or rewelding procedures for injection moulded HDPE end caps. While the standard covers material, manufacturing, dimensions, tolerances, and marking, welding details are generally covered in other codes such as IS 14333, which governs polyethylene pipe and fitting welding. Rewelding of injection moulded end caps is typically discouraged due to potential deformation or compromised integrity. For welding practices, manufacturers and users are advised to consult IS 14333 or relevant guidelines.