Committees responsible
National foreword
Foreword
1 Scope
2 Normative references
3 Definitions
4 Technical requirements
4.1 General
4.1.1 Ductile iron pipes and fittings
4.1.2 Surface condition and repairs
4.1.3 Types of joints and interconnection
4.1.4 Colour identification
4.2 Dimensional requirements
4.2.1 Diameter
4.2.2 Wall thickness
4.2.3 Length
4.2.4 Straightness of pipes
4.2.5 Flanged pipes
4.2.6 Fittings
4.2.7 Inspection chambers
4.2.8 Manholes
4.3 Material characteristics
4.3.1 Tensile properties
4.3.2 Hardness
4.4 Coatings and linings for pipes
4.4.1 General
4.4.2 External coating of zinc with finishing layer
4.4.3 Internal lining of high alumina cement mortar
4.5 Coatings for fittings and accessories
4.5.1 General
4.5.2 Epoxy coating
4.6 Marking of pipes and fittings
4.7 Leaktightness
4.7.1 Systems design requirements
4.7.2 Leaktightness of pipeline components
4.7.3 Leaktightness of joints
5 Performance requirements
5.1 General
5.2 Longitudinal bending of pipes
5.2.1 Integrity under service conditions
5.2.2 Bending resistance
5.3 Diametral stiffness of pipes
5.3.1 Integrity under service conditions
5.3.2 Resistance to ovalisation
5.4 Leaktightness of components for gravity pipelines
5.5 Leaktightness of joints
5.5.1 General
5.5.2 Test conditions
5.5.3 Test parameters
5.5.4 Restrained flexible joints
5.6 Chemical resistance to effluents
5.7 Abrasion resistance
6 Test methods
6.1 Dimensions
6.1.1 External diameter
6.1.2 Internal diameter
6.1.3 Wall thickness
6.1.4 Length
6.2 Straightness of pipes
6.3 Tensile testing
6.3.1 Samples
6.3.2 Preparation of test bar
6.3.3 Apparatus and test method
6.3.4 Test results
6.3.5 Test frequencies
6.4 Brinell hardness
6.5 Zinc coating mass
6.6 Thickness of paint coatings
6.7 Compressive strength of cement mortar lining
6.8 Thickness of cement mortar lining
6.9 Works leaktightness test for pipes and fittings
for positive pressure pipelines
6.9.1 General
6.9.2 Centrifugally cast pipes
6.9.3 Pipes not centrifugally cast and fittings
6.10 Works leaktightness test for pipes and fittings
for negative pressure pipelines
7 Types tests
7.1 Longitudinal bending of pipes
7.2 Diametral stiffness of pipes
7.3 Leaktightness of components for gravity pipelines
7.4 Leaktightness of joints to positive internal
pressure
7.5 Leaktightness of joints to negative internal
pressure
7.6 Leaktightness of joints to positive external
pressure
7.7 Chemical resistance to effluents
7.8 Abrasion resistance
8 Quality assurance
8.1 General
8.2 Type tests
8.3 Quality assurance system
9 Tables of dimensions
9.1 Socket and spigot pipes
9.2 Fittings for gravity sewers
9.3 Fittings for pressure sewers and vacuum sewers
Annex A (informative) Field of use, characteristics of
soils
Annex B (informative) Field of use, characteristics of
effluents
Annex C (informative) Calculation method for buried
pipelines, permissible heights of cover
National annex
NA (informative) Significant changes from BS 4772