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AS 3688-2005

[Available Superseded]

Water supply — Metallic fittings and end connectors

Specifies requirements for metallic body pipe fittings and connectors for use with copper tubes and stainless steel pipes and tubes and adaptor fittings for connection to other pipe materials in water supply and gas systems where the normal working temperature does not exceed 95 degrees Celsius, and where the maximum operating pressure does not exceed 1.4 MPa.
Published: 04/08/2005
Pages: 59
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Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Application
1.3 Referenced documents
1.4 Definitions
1.5 Designation of size
1.6 Marking
1.6.1 Space for mark of certifying body
1.6.2 Components
1.6.3 Marking requirements
1.7 Product documentation
1.7.1 Product data
2 Materials
2.1 Scope of Section
2.2 Materials in contact with drinking water
2.3 Metallic materials
2.3.1 Corrosion-resistant metallic materials
2.3.2 Copper
2.3.3 Copper alloy
2.3.4 Dezincification-resistant (DR) copper alloy
2.3.5 Stainless steel
2.4 Plastic component materials
2.4.1 General
2.4.2 Acetal
2.4.3  ‘Not applicable’
2.5 Other component materials
3 Design and dimensions
3.1 Scope of Section
3.2 Tube stops
3.3 Slip fittings
3.4 Spigots
3.5 Fixing device
3.6 Waterways
3.6.1 Copper and copper alloy
3.6.2 Stainless steel
3.7 Thickness of metal parts of fittings specified by dimension
3.7.1 General
3.7.2 Minimum thickness of unspecified metal parts
3.8 Screw threads
3.8.1 Screw-threaded sealing connections
3.8.2 Screw-threaded fastening connections
3.8.3 Thread engagement—Assembled joints
3.8.4 Other screw threads
3.9 Fabricated fittings
3.10 Geometry of fittings
3.11 Plating and other surface finishes
3.12 Finish and workmanship
4 Performance requirements
4.1 Scope of Section
4.2 Watertightness pressure test
4.3 Strength of fabricated joint (torque test)
4.4 Strength of joint assembly (pressure cycling test)
4.5 Resistance to pull-out of assembled joints
4.6 Strength of nut and assembly (torque test)
4.7 Thermal cycling test for joints containing non-metallic components
4.8 Watertightness under internal hydrostatic pressure whilst subjected to bending
4.9 Method for determining compatibility of fittings with pipe
4.10 Roll-grooved assembly (joint pressure resistance test)
5 Capillary fittings—Copper and copper alloy
5.1 Scope of Section
5.2 Design and dimensions
5.2.1 General
5.2.2 Internal diameter of socket
5.2.3 Length of socket
5.2.4 Wall thickness
5.2.5 Branches of different nominal size
5.2.6 Waterway diameter
5.3 Performance requirements
6 Compression fittings
6.1 Scope of Section
6.2 Design
6.2.1 Copper alloy compression fittings manufactured to dimensions
6.2.2 Compression fittings complying with performance requirements
6.3 Performance requirements
6.3.1 Compression fittings complying with Clause 6.2.1
6.3.2 Compression fittings complying with Clause 6.2.2
7 Threaded-end connectors
7.1 Scope of Section
7.2 Dimensions
7.3 Design
7.3.1 Thread stop
7.3.2 Wrenching flats
7.3.3 Thickness of threaded-end connectors
7.3.4 Thread sealing
7.4 Performance requirements
8 Union end connectors and couplings
8.1 Scope of Section
8.2 Design
8.2.1 Minimum wall thickness
8.2.2 Screw threads
8.2.3 Provision for tightening
8.2.4 Performance requirements
9 Roll-grooved jointing end connectors and coupling body
9.1 Scope of Section
9.2 Materials
9.2.1 Coupling
9.3 Design
9.3.1 Fittings General design and dimensions Roll-grooved connection ends Adaptor connection ends Fabricated end connectors
9.3.2 Coupling Adjustment
9.4 Performance requirements and test methods
9.5 Installation instructions
10 Mechanical jointing end connectors
10.1 Scope of Section
10.2 Design
10.2.1 General
10.2.2 Joint assembly—Mechanical-friction locked-end connectors
10.2.3 Joint assembly—Press-fit end connectors
10.3 Performance
10.4 Installation instructions
11 Other copper alloy fittings
11.1 Scope of Section
11.2 Threaded sockets
11.3 Reducing bushes with overlapping internal and external threads
11.4 Continuously threaded fittings
11.5 Performance requirements
Appendix A
A1 Scope
A2 Relevance
A3 Product certification
A4 Definitions
A5 Testing
A5.1 Type testing
A5.2 Batch release testing
A5.3 Retesting
A6 Type tests
A7 Batch tests
Appendix B
Appendix C
C1 General
C2 End connections
C2.1 Screw-threaded sealing connections
C2.2 Screw-threaded fastening connections
C2.3 Capillary fittings
C2.4 Compression fittings
C3 Examples
Appendix D
D1 Scope
D2 Principle
D3 Apparatus
D4 Test conditions
D5 Procedure
D5.1 Hydrostatic test (all fittings)
D5.2 Pneumatic test (in conjunction with hydrostatic test for cast fittings only)
D6 Test report
Appendix E
E1 Scope
E2 Principle
E3 Apparatus
E4 Procedure
E5 Test report
Appendix F
F1 Scope
F2 Principle
F3 Apparatus
F4 Procedure
F5 Test report
Appendix G
G1 Scope
G2 Principle
G3 Apparatus
G4 Test environment
G4.1 Metal joints
G4.2 Composite joints
G5 Procedure
G6 Test report
Appendix H
H1 Scope
H2 Principle
H3 Apparatus
H4 Procedure
H5 Test report
Appendix I
I1 Scope
I2 Principle
I3 Apparatus
I4 Assembly
I5 Procedure
I6 Test report
Appendix J
J1 Scope
J2 Apparatus
J3 Preparation of joint assemblies
J4 Procedure
J5 Test report
Appendix K
K1 Scope
K2 Principle
K3 Apparatus
K4 Preparation of test specimens
K5 Conditioning of test specimens
K6 Procedure
K7 Test report
Appendix L
L1 Scope
L2 Principle
L3 Apparatus
L4 Test conditions
L5 Procedure
L6 Test report
Appendix M
M1 Scope
M2 General
M3 Typical examples of simulated samples
M4 Special issues
M5 Component documentation
M6 Acceptance
Amendment control sheet
Cited references in this standard
Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
Elastomeric seals for waterworks purposes — Material requirements for pipe joints seals used in water and wastewater applications with the exception of natural rubber and polyisoprene compounds
NZS/BS 1400
Specification for copper alloy ingots and copper alloy and high conductivity copper castings
ASME B36.19
Stainless Steel Pipes
BS EN 10312
Welded stainless steel tubes for the conveyance of aqueous liquids including water for human consumption. Technical delivery conditions
Content history
[Available Superseded]
DR 04545