The IS 8008 Part 2:2003 standard details the specifications for injection moulded and machined high-density polyethylene (HDPE) 90° bend fittings utilized in potable water piping systems. It defines material grades, fabrication techniques, dimensional criteria, marking protocols, and certification processes to guarantee secure and compatible welded connections for HDPE pipes. This standard is vital for manufacturers, design engineers, and inspectors involved in potable water HDPE pipeline installations.
Overview
The IS 8008 Part 2:2003 standard details the specifications for injection moulded and machined high-density polyethylene (HDPE) 90° bend fittings utilized in potable water piping systems. It defines material grades, fabrication techniques, dimensional criteria, marking protocols, and certification processes to guarantee secure and compatible welded connections for HDPE pipes. This standard is vital for manufacturers, design engineers, and inspectors involved in potable water HDPE pipeline installations.
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Contents
Structure
This section defines the specific requirements applicable to 90° HDPE bend fittings used in potable water piping. It includes dimensional data such as nominal diameter, manufacturing reference diameter, welding length, and laying length with specified tolerances. The section also references rounding rules per IS 2:1960 and highlights the governance of the BIS Standard Mark under the BIS Act, 1986.
Details primary reference to IS 8008 Part 1 for general fitting requirements and provides comprehensive tables outlining the dimensional parameters for 90° bends, including tolerances. It also discusses certification norms and rounding conventions to maintain consistency.
Specifies the materials, grades, and manufacturing processes such as injection moulding and machining for 90° bends ranging from 20 mm to 160 mm nominal diameter. It emphasizes compliance with Part 1 for material and testing criteria, dimensional tolerances, and the application of the BIS Standard Mark.
Explains the details of injection moulding as the primary method for producing HDPE bends and the optional machining processes for precision finishing. It reiterates adherence to IS 8008 Part 1 for materials and quality standards.
Provides typical geometry details including bend radius expressed as 1.5 to 3 times the nominal diameter, wall thickness as per Part 1, and performance criteria. Accompanied by dimensional tables for standard sizes.
Presents the key measurements for laying length and welding length, along with permissible tolerances to ensure proper fit and weld quality. This section includes a detailed table with sizes and dimensions.
Outlines the requirements for outside diameter and wall thickness of fitting ends referencing Clause 8 of IS 8008 Part 1 and additional considerations from Part 6 (2003). It reinforces dimensional conformity for reliable assembly.
Describes mandatory marking elements including manufacturer identification, fitting size, material grade, and pressure class. It also covers the optional application of the BIS Standard Mark under regulatory provisions.
Details the specific mandatory markings on each 90° bend fitting to ensure traceability, material verification, and pressure classification. Includes a summarized table of dimensional data for quick reference.
Explains the optional use of the BIS Standard Mark on fittings, licensing conditions under the BIS Act 1986, and the significance of the mark indicating compliance with Indian Standards.
Presents detailed tables with nominal diameters, manufacturing reference diameters, welding lengths, and laying lengths including tolerances. Emphasizes the importance of maintaining prescribed dimensions for installation and welding.
Summarizes key dimensional specifications and tolerance limits. Provides guidance on rounding numerical values as per IS 2:1960, use of BIS Standard Mark, and adherence to the latest versions of IS 8008 standards for compliance assurance.
Frequently Asked
IS 8008 Part 2 refers to Part 1 for material specifications, mandating the use of HDPE grades such as PE 80 or PE 100 that fulfill physical, chemical, and performance requirements suitable for potable water. These fittings are injection moulded or machined within sizes 20 mm to 160 mm, ensuring durability and safety for drinking water applications.
As per IS 8008 Part 2 (Clause 3.2.2), the diameter for manufacturing reference (D) permits a tolerance of ±2 mm, welding length (K) is fixed at 15 mm with a tolerance of ±3 mm, and laying length (Z) tolerances vary by nominal size, ranging from ±1 mm to ±3 mm. These tolerances ensure proper fit and welding consistency for 90° bends.
Each 90° bend fitting must be distinctly marked with the manufacturer's identity, the nominal size of the fitting, the material grade as specified in IS 8008 Part 1, and the working pressure class. Optionally, the fitting may also display the BIS Standard Mark indicating conformity with Indian Standards.
Yes, the standard allows rewelding of joints that fail inspection, provided the weld length remains unchanged and the rewelded joint meets all dimensional and quality requirements. Proper removal of defective welds and adherence to original welding procedures are essential to maintain compliance and structural integrity.
The standard aligns its material grades, dimensional criteria, and welding requirements with those specified in IS 4984, ensuring that fittings manufactured under IS 8008 Part 2 can be securely welded and integrated with IS 4984 HDPE pipes. This compatibility guarantees joint integrity and performance in potable water systems.
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