I.S. 266-1:1991

Introduction
Declaration
Clauses
1 Scope
2 References
3 Definitions
4 Material Requirements
5 Physical Requirements for Manufactured Pipe
6 Performance Requirements
7 Testing
8 Control of Test Conditions
9 Marking
10 Stocking and Transport
11 Quality Systems
12 Certification
13 Compliance
Tables
1 Pipe Classification
2 Out-of-square tolerance for ends
3 Outside diameter and wall thickness
4 Requirements for coiled pipe
5 Minimum yield strength and elongation
6 Minimum ductile test pressures
7 Stress Crack Resistance
8 Test Pressures
9 Schedule of requirements for Phase 1 Approval for
    pipe sizes up to and including 250 mm
10 Schedule of requirements for Phase 2 Approval for
    pipe sizes up to and including 250 mm
11 Schedule of requirements for process control for
    pipes up to and including 250 mm
12 Schedule of requirements for batch acceptance
13 Schedule of requirements for Phase 1 Approval for
    pipe sizes greater than 250 mm
14 Schedule of requirements for process control for
    pipe sizes greater than 250 mm
Figures
1 Pigment dispersion requirements
2A. Example of DSC trace (Induction time)
2B. Example of DSC trace (Induction temp.)
3A. Tensile test specimen (thick wall pipe)
3B. Tensile test specimen (thin wall pipe)
4. Details of Notching method
Appendices
A. Testing and Sampling Requirements for Pipe Sizes
    up to and including 250 mm
B. Testing and Sampling Requirements for Pipe Sizes
    greater than 250 mm
C. Pigment Dispersion Test
D1. Thermal Stability Test 1
D2. Thermal Stability Test 2
E. Dimensions
F. Tensile Tests
G. Short Term Pressure Test
H. Pipe End Reversion Test
I. Pressure Tests - General
J. Long-Term Strength Test
K. Stress Crack Resistance
L. Resistance to Weathering Test
M. Squeeze-off Test
N. Butt Fusion Jointing
O. Notched Stress Crack Resistance

Describes the materials, dimensions, pipe performance and methods of testing of polyethylene pipes in sizes from 16 mm to 500 mm diameter operating at pressures up to 4 bar and temperatures from -5 degree C up to 40 degree C when used in natural, manufactured gas and liquefied petroleum gas distribution systems.