The standard outlines the specifications for injection moulded and machined high-density polyethylene (HDPE) sandwich flanges used in potable water systems. It details material criteria, production methods, dimensional standards, marking protocols, and testing procedures to ensure seamless integration and reliable performance with HDPE pipes as described in IS 4984. This specification is crucial for manufacturers, engineers, and inspectors ensuring safe and compliant HDPE water supply fittings.
Overview
The standard outlines the specifications for injection moulded and machined high-density polyethylene (HDPE) sandwich flanges used in potable water systems. It details material criteria, production methods, dimensional standards, marking protocols, and testing procedures to ensure seamless integration and reliable performance with HDPE pipes as described in IS 4984. This specification is crucial for manufacturers, engineers, and inspectors ensuring safe and compliant HDPE water supply fittings.
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Frequently Asked
IS 8008 Part 7 details that sandwich flanges, produced via injection moulding and machining for nominal sizes ranging from 20 mm to 355 mm, must adhere to dimensional and tolerance standards established in IS 8008 Part 1. The flanges are designed to fit HDPE pipes, with tolerances ensuring proper welding compatibility. While Part 7 does not explicitly list all dimensional tolerances, it mandates adherence to Part 1 for precise measurements and testing procedures involving flange installation on pipe ends.
The standard endorses injection moulding as the primary manufacturing technique for sandwich flanges sized between 20 mm and 355 mm, complemented by machining operations where necessary to meet dimensional accuracy. This approach guarantees high-quality HDPE fittings that comply with IS 8008 Part 1 requirements, ensuring reliability and dimensional precision for potable water applications.
Compatibility is assured by specifying that sandwich flanges are fabricated from HDPE materials conforming to IS 8008 Part 1, which aligns with the material and dimensional properties of IS 4984 HDPE pipes. The flanges are designed for welding directly onto these pipes, with testing procedures involving welding the pipe end while the flange is positioned, validating mechanical integrity and hydraulic performance. This integration confirms that the fittings and pipes function seamlessly within potable water supply systems.
Each sandwich flange must be distinctly marked with the manufacturer’s identification, the nominal size of the fitting, the material grade, and the appropriate pressure class rating. Additionally, the flanges may carry the BIS Standard Mark indicating certification compliance. This marking ensures traceability, material verification, and adherence to pressure specifications for safe and standardized use.
The standard requires testing procedures consistent with IS 8008 Part 1, which include hydrostatic pressure testing to evaluate pressure resistance, visual inspections for weld and surface defects, and non-destructive testing techniques such as radiography or ultrasonic testing when applicable. The tests are performed on assemblies where the pipe end is welded with the sandwich flange slipped on, ensuring weld quality and overall joint reliability in potable water applications.
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