BS 1139-2.1:1991

Brief history
1. Object and field of application
2. References
3. Definitions
3.1 Coupler
3.2 Right angle coupler (RA)
3.3 Swivel coupler (SW)
3.4 Parallel coupler (PA)
3.5 Sleeve coupler (SF or SS)
3.6 Loose spigot (LS)
3.7 Base-plate (BP)
4. Symbols
4.1 Measured values
4.2 Statistical values
5. Materials and design
5.1 Materials
5.2 Data required from the manufacturer for
      assessment purposes
6. Requirements
6.1 Design requirements
6.2 Required characteristics for couplers under
      load (see clause 9)
6.3 Requirements in the case of design alteration
7. Sampling for prototype tests
8. Assessment methods
8.1 Assessment without statistical analysis
8.2 Assessment with statistical analysis
9. Load tests for prototype couplers
9.1 General
9.2 Testing of behaviour under load of right angle
      couplers
9.3 Testing of behaviour under load of swivel couplers
9.4 Determination of the ultimate load for right angle
      and swivel couplers
9.5 Testing of the torsional rigidity of right angle
      couplers
9.6 Tensile tests on friction type sleeve couplers
9.7 Bending load capacity testing of class B sleeve
      couplers
9.8 Tensile testing of sleeve couplers with sheer
      pins
9.9 Testing of behaviour under load of parallel
      couplers
9.10 Determination of the ultimate load for parallel
      couplers
Tables
1. Summary of requirements for testing the behaviour
    under load of prototype couplers specified in
    clauses 8 and 9
2. Examples of sampling plans for inspection by
    attributes
3. Examples of sampling plans for inspection by
    variables
4. Flow diagram giving instructions for random
    sampling when testing the behaviour of right angle
    couplers, swivel couplers, sleeve couplers or
    parallel couplers by attributes or by variables
Figures
1. Maximum clearance between centring device and tube
2. Operating characteristics
3. Test apparatus
    a) to test the behaviour under load of right angle
        couplers
    b) to test the behaviour under load of swivel
        couplers
    c) to determine the ultimate load of right angle
        and swivel couplers
4. Test apparatus to determine the torsional rigidity
    of right angle couplers
5. Angle of rotation phi against the torque M for
    class B right angle couplers
6. Test apparatus for tensile testing of sleeve
    couplers
7. Test apparatus for bending load capacity testing
    of class B sleeve couplers
8. Test apparatus for investigating the behaviour
    under load of parallel couplers
9. Test apparatus to determine the ultimate load of
    parallel couplers

Requirements for materials and design and test procedures for couplers, loose spigots and base plates used for connecting steel tubes of 48.3 mm outside diameter and of at least 3.2 mm nominal wall thickness.