What are the material grades covered in IS 14885?

The standard covers PE 80 and PE 100, which are classified based on their Minimum Required Strength (MRS) of 8.0 MPa and 10.0 MPa, respectively (Clause 4.1).

What is the mandatory color for PE gas pipes?

Pipes must be either entirely yellow or black with four equally spaced co-extruded yellow stripes along the length (Clause 9.1).

What does SDR mean for these pipes?

SDR stands for Standard Dimension Ratio, which is the ratio of the pipe's nominal outer diameter to its nominal wall thickness. It determines the pipe's pressure rating.

What is the hydrostatic strength test requirement?

The pipe must withstand a specified internal pressure at a given temperature for a set duration without bursting. For example, a PE 100 pipe must withstand 4.6 MPa at 80°C for 165 hours (Table 2).

IS 14885

: 2001

Polyethene Pipes for the Supply of Gaseous Fuels

CurrentFrequently UsedSpecificationBIMMEP · Plastic Piping System

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This standard specifies the requirements for polyethylene (PE) pipes made from PE 80 and PE 100 grades for the supply of gaseous fuels. It covers material properties, dimensions, mechanical and physical characteristics, and marking requirements for pipes used in city gas distribution (CGD) networks.

Polyethene Pipes for the Supply of Gaseous Fuels

Quick Reference Values

Material Grade PE 80 Minimum Required Strength (MRS)8.0 MPa

Material Grade PE 100 Minimum Required Strength (MRS)10.0 MPa

Pipe Color RequirementYellow or Black with four co-extruded yellow stripes

Standard Dimension Ratios (SDR) CoveredSDR 17.6, SDR 13.6, SDR 11

Reversion Test Requirement (Max Shrinkage)3 percent

Oxidation Induction Time (OIT) at 200°C (min)20 minutes

Key Formulas

σ = p(SDR-1) / 2 — Standard pipe formula relating hoop stress (σ), internal pressure (p), and Standard Dimension Ratio (SDR)

Practical Notes

The color coding (yellow or black with yellow stripes) is a critical safety feature for easy on-site identification of gas pipelines, distinguishing them from water or other utility lines.

SDR (Standard Dimension Ratio) is a primary design parameter; a lower SDR value means a thicker pipe wall, allowing for a higher Maximum Operating Pressure (MOP).

Proper jointing using certified electrofusion or butt-fusion techniques is paramount for the long-term integrity and safety of the pipeline system.