IS 15927 (Part 2) : 2000Polyethene Fittings for use with Polyethylene Pipes for the supply of Gaseous Fuels - Specification, Part 2: Spigot Fittings for Butt Fusion for Socket Fusion using Heated Tools and for use with Electro Fusion Fittings
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IS 15927:2000 (Part 2) is the Indian Standard (BIS) for polyethene fittings for use with polyethylene pipes for the supply of gaseous fuels - specification, part 2: spigot fittings for butt fusion for socket fusion using heated tools and for use with electro fusion fittings. This standard specifies the requirements for polyethylene (PE) electrofusion fittings, such as couplers and saddles, used for joining PE pipes in gaseous fuel supply networks. It covers material properties (PE 80, PE 100), dimensional standards, and performance criteria for the fittings and the final welded assembly.
Polyethene Fittings for use with Polyethylene Pipes for the supply of Gaseous Fuels - Specification, Part 2: Spigot Fittings for Butt Fusion for Socket Fusion using Heated Tools and for use with Electro Fusion Fittings
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! This standard is technically withdrawn and has been superseded by IS 16738 (Part 3):2018, which should be consulted for new projects.
! Proper surface preparation, including scraping the pipe surface to remove the oxidized layer, is absolutely critical for achieving a reliable electrofusion joint.
! Fusion parameters (time, voltage) are specific to the fitting manufacturer and size; always use the parameters provided with the fitting, typically via a barcode scanned by the electrofusion controller.
ISO 8085-2:2001ISO (International Organization for Standardization)
HighCurrent
Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels — Metric series — Specifications — Part 2: Spigot fittings for use with socket-fusion-using heated tools
Directly covers PE spigot fittings for socket fusion in gas applications, forming the basis for the IS code.
EN 1555-3:2021CEN (European Committee for Standardization), Europe
HighCurrent
Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
Covers all PE fittings for gas supply, including those for socket fusion, with very similar requirements.
ASTM D2513-22aASTM International, USA
MediumCurrent
Standard Specification for Polyethylene (PE) Gas Pressure Pipe, Tubing, and Fittings
Covers all PE components for gas, but uses different dimensional standards (IPS) and material classifications.
AS/NZS 4129:2020Standards Australia / Standards New Zealand
MediumCurrent
Fittings for polyethylene (PE) pipes for pressure applications
Covers PE fittings for general pressure use, including gas, with socket fusion fittings included in its scope.
Key Differences
≠The Indian standard specifies material grades as PE-G-63, PE-G-80, and PE-G-100, where 'G' denotes gas. International standards like ISO and EN simply use PE 80 and PE 100.
≠IS 15927 allows a Melt Flow Rate (MFR) deviation of up to ±25% from the raw material, whereas EN 1555-3 is stricter, allowing only a ±20% deviation for the finished fitting.
≠IS 15927 was published in 2000 and is based on older testing methodologies. Modern standards like EN 1555-3:2021 include more advanced performance requirements, such as resistance to slow crack growth (SCG) for fittings, which is not explicitly detailed in the IS code.
≠While dimensional requirements for the fusion zone are similar to ensure compatibility, overall fitting dimensional tolerances and wall thickness profiles can vary slightly between the IS code and newer EN/ISO standards.
Key Similarities
≈All standards are based on the same fundamental materials, typically PE 80 or PE 100 black or yellow compounds stabilized against UV radiation and thermal degradation.
≈The core principle and geometry for socket fusion (socket depths, spigot insertion lengths, interference fit) are broadly harmonized to ensure interoperability between pipes and fittings from different manufacturers adhering to these standards.
≈Key performance tests such as hydrostatic strength (hoop stress test), longitudinal reversion, and Oxidation Induction Time (OIT) are required by all standards, often with very similar test conditions and acceptance criteria.
≈Marking requirements are consistent, demanding that each fitting be permanently marked with the manufacturer's name, nominal size, material designation (e.g., PE 100), and SDR or pressure rating.
Parameter Comparison
Parameter
IS Value
International
Source
Carbon Black Content
2.25 ± 0.25 % by mass
2.25 ± 0.25 % by mass
EN 1555-3:2021
Hydrostatic Strength (PE 100, 80°C, 165 h)
No failure at 5.5 MPa induced stress
No failure at 5.5 MPa induced stress
EN 1555-3:2021
Oxidation Induction Time (OIT) at 200°C
Minimum 20 minutes
Minimum 20 minutes (Standard OIT)
ISO 8085-2:2001
Longitudinal Reversion at 110°C
Maximum 3%
Maximum 3%
EN 1555-3:2021
MFR (190°C/5kg) Deviation from Compound
≤ ±25%
≤ ±20%
EN 1555-3:2021
Colour Requirement for Gas Fittings
Black (with yellow stripes) or Yellow
Black or Yellow/Orange
EN 1555-3:2021
Resistance to Gas Constituents (Methane)
Required (Tested as per ISO 4437)
Required (Tested as per ISO 4437-2)
EN 1555-3:2021
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Minimum Required Strength (MRS) for PE 10010.0 MPa
Minimum Required Strength (MRS) for PE 808.0 MPa
Hydrostatic Strength Test Stress (PE 100, 20°C, 100h)12.4 MPa
Melt Flow Rate (MFR) Deviation±20% of base resin
Applicable Standard Dimension Ratios (SDR)SDR 11 and SDR 17.6
Key Formulas
P = (20 * MRS) / (C * (SDR - 1)) — Pipe Pressure Rating Formula (from pipe standard, context for fitting usage)
Tables & Referenced Sections
Key Tables
Table 1 - Material Characteristics
Table 2 - Dimensions and Tolerances of Spigots for Electrofusion Socket Fittings
Table 4 - Hydrostatic Strength Requirements
Table 5 - Test Conditions for Resistance to Gas Constituents
Key Clauses
Clause 4 - Material
Clause 5 - Geometrical Characteristics
Clause 6 - Mechanical Characteristics
Clause 8 - Performance Requirements of Assembled Joints
It applies to fittings made from polyethylene grades PE 80 and PE 100 (Clause 4).
Can these fittings be used for water pipelines?+
No, this standard is specifically for fittings used in the supply of gaseous fuels. Fittings for water supply are covered by different standards.
What is a critical test for an electrofusion joint made with these fittings?+
The hydrostatic strength test on an assembled joint is a critical performance requirement to ensure it can withstand internal pressure without failure (Clause 6.1).
Is this standard still active?+
No, IS 15927-3:2000 has been withdrawn and replaced by IS 16738 (Part 3):2018.