This standard outlines the specifications for injection moulded and machined high-density polyethylene (HDPE) reducer fittings used in potable water systems. It details material criteria, manufacturing techniques, dimensions, tolerances, marking, and certification requirements for reducers sized from 20 mm to over 355 mm, ensuring alignment with relevant IS codes for quality and compatibility.
Overview
This standard outlines the specifications for injection moulded and machined high-density polyethylene (HDPE) reducer fittings used in potable water systems. It details material criteria, manufacturing techniques, dimensions, tolerances, marking, and certification requirements for reducers sized from 20 mm to over 355 mm, ensuring alignment with relevant IS codes for quality and compatibility.
Audience
Contents
Structure
This section defines the dimensional boundaries and tolerance levels for injection moulded and machined HDPE reducer fittings. It includes key tolerances such as ±1 mm for laying length and weld length, and ±1° for angular parameters, alongside sample dimension tables illustrating major and minor diameters, pressure ratings, and manufacturing references.
Lists the primary standards referenced, including IS 8008 Part 1 for general fitting requirements and IS 4984 for HDPE pipe specifications. Provides tables outlining dimensional tolerances and sample dimensions for both injection moulded and machined reducers.
Details the manufacturing tolerances and dimensional requirements for reducers, distinguishing between injection moulded reducers (20 mm to 315 mm) and machined reducers (355 mm and above). Highlights the critical angles and lengths, as well as compliance with BIS certification for markings.
Describes marking protocols including the use of the BIS Standard Mark, manufacturer identification, size, material grade, and working pressure. Emphasizes the licensing requirements under the BIS Act, 1986, and the importance of clear traceability.
Summarizes dimensional and tolerance requirements for both injection moulded and machined reducers, supported by tabular data for various sizes and pressure classes, ensuring accuracy in fabrication and installation.
Specifies material thickness requirements consistent with IS 4984, manufacturing methods including machining from extruded pipes or compression moulded slabs, and the criticality of maintaining dimensional precision and weld bevel angles.
Outlines expected performance benchmarks such as strength, leak-tightness, durability, and dimensional accuracy. Covers rounding conventions per IS 2:1960 and basic pressure design formulas relevant to HDPE reducer fittings.
Highlights dimensional verifications, rounding rules, and detailed inspection criteria. Reiterates the importance of BIS certification and adherence to specified tolerances during testing.
Explains the regulatory framework for BIS Standard Mark application on reducer fittings, the licensing process for manufacturers, and the assurance of product quality and compliance through certification.
Includes comprehensive tables of dimensions, tolerances, and specifications for both injection moulded and machined reducers. Provides reference data essential for design, manufacturing, and quality assurance.
Frequently Asked
The standard mandates injection moulding as the primary manufacturing method for reducers sized between 20 mm and 315 mm, with machining applied as necessary for finishing or dimensional precision. Reducers of 355 mm diameter and above are produced by machining from thick-walled extruded pipes or compression moulded slabs, ensuring precise dimensions and compliance with potable water supply standards.
Reducers ranging from 20 mm to 315 mm diameter are produced mainly through injection moulding, occasionally followed by machining for accuracy. Those measuring 355 mm and larger are manufactured exclusively by machining from either thick-walled extruded pipes or compression moulded slabs. This differentiation ensures appropriate manufacturing techniques are applied for each size category to maintain quality and dimensional integrity.
Reducers must be marked clearly with the manufacturer's identification, the fitting size, the material grade, and the applicable working pressure consistent with IS 4984. Markings should be placed prominently on the fitting to enable traceability and confirm compliance with the standard and pressure requirements for safe potable water applications.
IS 8008 Part 4 explicitly references IS 4984:1995, which governs HDPE pipe specifications, ensuring that reducer fittings are dimensionally and materially compatible with the pipes. This alignment facilitates secure welding and fusion joints, guaranteeing leak-proof connections and consistency in quality between fittings and pipes.
Dimensional tolerances for reducers sized 20 mm to 315 mm are generally tighter, reflecting the precision of injection moulding and machining, typically within ±0.5 mm. For reducers 355 mm and above, machined from thick-walled pipes or slabs, tolerances are slightly broader, around ±1.0 mm. Welding practices are not explicitly detailed in this part but should adhere to relevant IS welding standards such as IS 816 or IS 9595, including proper preparation and inspection protocols.
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