BS 4772:1988
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Specification for ductile iron pipes and fittings
Hardcopy , PDF
15-04-1995
English
29-04-1988
Foreword
Committees responsible
Specification
Section one. General
1.1 Scope
1.1.1 General
1.1.2 Pipes
1.1.3 Fittings
1.2 Definitions
1.3 Materials
1.3.1 General
1.3.2 Effect of non-metallic materials on water
quality
1.4 Class designations and calculation of wall
thicknesses of pipes and fittings
1.4.1 Class designations
1.4.2 Calculation of wall thicknesses of pipes and
fittings
1.5 Manufacturer's certificate
Section two. Materials, properties and dimensions
2.1 Pipes and fittings
2.1.1 Pipes
2.1.2 Fittings
2.1.2.1 Group I fittings
2.1.2.2 Group II fittings
2.1.2.3 Maximum hydraulic working pressure
2.2 Requirements for works pressure test
2.2.1 Hydrostatic pressure
2.2.2 Air test
2.3 Types of joint
2.3.1 Flanged joints
2.3.1.1 General
2.3.1.2 Flange faces
2.3.1.3 Bolt holes
2.3.1.4 Angular displacement of bolt holes
2.3.1.5 Screwed-on flanges
2.3.1.6 Welded-on flanges
2.3.2 Requirements for type test for screwed-on and
welded-on flanges
2.3.2.1 General
2.3.2.2 Type test groupings
2.3.3 Bolting of flanged joints
2.3.4 Gaskets
2.3.4.1 Gaskets materials
2.3.4.2 Gaskets for flexible joints
2.3.4.3 Gaskets for flanged joints
2.4 Marking
2.4.1 Marking of pipes
2.4.2 Marking of fittings
2.4.2.1 Marking of group I fittings
2.4.2.2 Marking of group II fittings
2.5 Mechanical properties
2.5.1 Requirements
2.5.2 Verification procedures
2.5.2.1 General
2.5.2.2 Alternate methods of verification of
mechanical properties
2.6 Hardness
2.7 Heat treatment
2.7.1 Pipes
2.7.2 Fittings
2.8 Condition of pipes and fittings
2.8.1 Defects
2.8.1.1 Cracks and tears
2.8.1.2 Other defects
2.8.2 Surface and other imperfections
2.8.3 Surface hardness
2.9 Straightness of pipe
2.10 Tolerances on dimensions
2.10.1 External diameters of pipes and fittings
2.10.2 Tolerances on thickness
2.10.3 Tolerances on length
2.10.4 Tolerances on flanges
2.11 Tolerances on mass
Section three. Requirements for surface protection
3.1 External zinc coating
3.1.1 General
3.1.2 Zinc coating
3.1.2.1 Pipe surface condition
3.1.2.2 Method of application
3.1.3 Coating characteristics
3.1.3.1 Appearance
3.1.3.2 Zinc coating mass
3.1.3.3 Uniformity of coating
3.1.4 Verification procedures
3.1.4.1 Visual inspection
3.1.4.2 Determination of mean zinc coating mass
3.1.5 Repairs
3.1.6 Finishing layer
3.2 Cement mortar lining
3.2.1 General
3.2.2 Materials
3.2.2.1 Cement
3.2.2.2 Sand
3.2.2.3 Water
3.2.2.4 Admixtures
3.2.3 Cement mortar mix
3.2.4 Application of lining
3.2.5 Curing of linings
3.2.6 Thicknesses of linings
3.2.7 Minimum bore of cement mortar lined pipe
3.2.8 Surface condition of linings
3.2.9 Repair of linings
3.2.10 Seal coatings
3.3 Bitumen coatings
Appendices
A Information to be supplied by the purchaser
B Method of works hydrostatic pressure testing for
pipes and group I fittings complying with table 1
C Method of type testing for screwed-on and welded-on
flanges
D Method of tensile testing ductile iron pipes and
fittings
E Method of verifying mechanical properties of pipes
and fittings by non-destructive testing supplemented
by complementary mechanical testing
F Method of verifying mechanical properties by batch
sampling of pipes and fittings
G Method for the determination of the mean zinc
coating mass
H Cutting of existing pipelines
J Bolt hole diameter and bolt size for high tensile
bolts
K Unified design fittings
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