BS 65:1991

Committees responsible
Foreword
Specification
Section one. General
1 Scope
2 References
3 Definitions
4 Materials and manufacture
Section two. Pipes
5 Dimensions and tolerances
6 Performance requirements
Section three. Fittings
7 Dimensions and tolerances
8 Performance requirements
Section four. Flexible mechanical joints
9 Performance requirements
Section five. Sampling for tests
10 Sampling of pipes and fittings
11 Sampling of joints
12 Limitations
Section six. Marking
13 Marking
Appendices
A Straightness test
B Crushing strength test
C Bending moment resistance (BMR) test
D Pressure tests
E chemical resistance test for pipes and fittings
F Water absorption and acid resistance test for extra
    chemically resistant pipes and fittings
G Mechanical test methods for joint assemblies
H Inspection procedures
Tables
1 Dimensions of barrels
2 Maximum permissible deviation from straightness (Ds)
3 Crushing strength
4 Bending moment resistance
5 Maximum water absorption
6 Applicable dimensional and performance requirements
    for fittings
7 Deflections
8 Relevant sampling procedures and test clauses for
    pipes and fittings
9 Preconditioning time for strength tests
10 Support distance for shear resistance tests
11 Normal inspection for both single and double sampling
    plans
12 Reduced inspection for both single and double
    sampling plans
13 Limit numbers for reduced inspection
14 Tightened inspection for both single and double
    sampling plans
15 Tightened inspection for resubmission of rejected
    batches
Figures
1 Terminology for straightness test method
2 Example of use of suitable straightness test
    apparatus
3 Bearer shape
4 Typical arrangement for crushing strength test
5 Diagrammatic arrangement of the four point loading
    test method
6 Diagrammatic arrangement of the three point loading
    test method
7 Deflection test
8 Shear resistance test

Specifies certain dimensions, physical and performance characteristics for vitrified clay pipes and fittings. For use in the construction of drainage and sewerage systems, operated as gravity pipelines, or as ducts. Requirements for sampling and marking are also given.

This British Standard specifies requirements for vitrified clay pipes and fittings with or without sockets, and compatible accessories, for the construction of drainage and sewerage systems, operated as gravity pipelines, or for use as ducts.

Normal and extra chemically resistant pipes and fittings are covered by the standard, when supplied without flexible mechanical joints, for example to meet repair situations or for use with special jointing compounds. Surface water pipes and fittings are also covered by the standard, together with ducts. The standard applies to both glazed and unglazed products.

The standard also specifies performance requirements for flexible mechanical joints used with surface water clay pipes and fittings.

NOTE The pipes and fittings specified may be suitable for use with joints other than flexible mechanical joints but such joints are outside the scope of this standard.

The requirements specified cover certain dimensions and tolerances, physical and performance characteristics, marking and sampling, and testing and inspection procedures to verify compliance and to facilitate quality control.