BS 7281:1990

Foreword
Committees responsible
Specification
1. Scope
2. Definitions
3. Materials
4. Pressure classification
5. Dimensions and tolerances
6. Physical properties
7. Performance requirements
8. Marking
Appendices
A. Determination of long-term hydrostatic strength
B. Methods for determination of dimensions
C. Conditioning
D. Method for determination of oxidation induction
     time
E. Method for determination of circumferential
     reversion
F. Method of preparation of test pieces for
     determination of tensile properties
G. Hydrostatic pressure testing
H. Method of preparation of longitudinally notched
     test pieces of polyethylene pipe
I. Method for application of squeeze-off
J. Method for jointing by butt fusion
K. Method for exposure of pipe test pieces to
     weathering
L. Guidance on quality control testing
M. References
Tables
1. Classification of materials
2. Pressure classification of pipes
3. Outside diameter and wall thickness
4. Maximum ovality
5. Out-of-squareness tolerances for ends
6. Coil dimensions and winding temperatures
7. Conditioning period
8. Tensile properties
9. Minimum hydrostatic test pressure
10. Hydrostatic pressure resistance at 80 deg C
11. Ke for triangle T below or equal to 10 deg C or in
     between the limits given for each triangle T in
     the table
12. Extrapolation limit as a function of test
     temperature and service temperature
13. Dimensions of tensile test pieces
14. Free length of test piece
15. Recommended schedule for type testing of pipe sizes
     up to and including 250 mm nominal outside diameter
16. Recommended schedule for inspection testing of
     pipes during manufacture
Figures
1. Selected extrapolation models
2. Flow sheet standard extrapolation method: procedure
     for Method 1
3. Example of thermogram
4. Tensile test pieces
5. Details of notching method

Straight and coiled pipes intended for use in the conveyance and distribution of natural and manufactured gaseous fuels.