BS 4772:1988

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

Pipes and fittings produced by centrifugal or normal casting methods. Covers both flanged (in ratings of PN 10, 16, 25 and 40) and spigot/socket types for flexible joints. Includes external surface coatings in zinc and bitumen and internal linings of cement mortar.