The IS 15927 Part 2:2012 standard outlines the specifications for polyethylene spigot fittings used with polyethylene pipelines in gas supply systems, covering nominal diameters ranging from 16 mm up to 630 mm. It defines requirements for fittings intended for butt fusion, socket fusion using heated tools, and electrofusion processes, ensuring compatibility with IS 14885 polyethylene pipes. This standard is crucial for manufacturers, engineers, and installers to guarantee the safety, quality, and performance of polyethylene gas piping fittings.
Overview
The IS 15927 Part 2:2012 standard outlines the specifications for polyethylene spigot fittings used with polyethylene pipelines in gas supply systems, covering nominal diameters ranging from 16 mm up to 630 mm. It defines requirements for fittings intended for butt fusion, socket fusion using heated tools, and electrofusion processes, ensuring compatibility with IS 14885 polyethylene pipes. This standard is crucial for manufacturers, engineers, and installers to guarantee the safety, quality, and performance of polyethylene gas piping fittings.
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Frequently Asked
IS 15927 Part 2:2012 encompasses polyethylene spigot fittings with nominal diameters ranging from 16 mm to 630 mm. These sizes align with polyethylene pipes specified in IS 14885:2001. The standard details dimensional tolerances, minimum lengths, and diameters to assure proper fit and fusion joint integrity for these sizes.
The standard primarily specifies butt fusion as the joining method for polyethylene spigot fittings, referencing IS 7634 (Part 2) for jointing parameters. Additionally, socket fusion using heated tools and electrofusion methods are recognized, with socket fusion detailed in IS 15927 Part 1 and electrofusion in Part 3. Each method has specific preparation and testing requirements to ensure joint quality.
Polyethylene fittings must be made from a pure polyethylene compound containing only necessary additives that do not adversely affect fusion. The additives should be uniformly dispersed, and the material must be free from visible moisture. The fittings must comply with physical and chemical properties outlined in IS 14885, including density and melt flow index, to guarantee compatibility and reliable fusion performance with polyethylene pipes.
Acceptance and type tests involve preparing test assemblies by butt fusion (per Annex A), socket fusion, or electrofusion as appropriate, using pipes compliant with IS 14885. Butt fusion joints follow procedures in IS 7634 (Part 2), with conditioning of materials at 27 ± 2°C for at least 8 hours. Tests include hydraulic pressure tests at specified temperatures and hoop stresses, melt flow rate determination, visual inspections, and dimensional checks, ensuring fittings meet required performance and quality standards.
Markings on fittings must be permanent, clear, and legible during normal handling, storage, and installation, without causing cracking or compromising performance. The BIS Standard Mark may be applied subject to licensing. Packaging should protect fittings from damage and preserve marking legibility during transport and storage, typically involving individual sealing in polyethylene bags with a minimum thickness of 75 microns, and bulk packing in suitably marked cartons.
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