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AS/NZS 4766:2020


Rotationally moulded buried, partially buried and non-buried storage tanks for water and chemicals

This Standard specifies requirements for the design and manufacture of storage tanks that are rotationally moulded in one-piece single or multi-layer seamless construction.
Published: 26/06/2020
Pages: 42
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Exclusions
1.3 Normative references
1.4 Terms and definitions
1.5 New designs and innovations
2 Materials
2.1 Polyethylene
2.2 Compounds
2.3 Rework of material in compounding
2.4 Melt flow index (MFI)
2.5 Thermal stability of base resin
2.6 Carbon black for UV stability
2.7 UV resistance
2.7.1 Application
2.7.2 Exposure to sunlight for non-buried and partially buried tanks
2.7.3 All other tank types
2.7.4 Alternative test methods
2.8 Dispersion of additives and pigments
2.8.1 General
2.8.2 Non-UV stabilized base resins
2.8.3 UV-stabilized base resins
2.9 Light penetration
2.10 Stress-cracking resistance
2.11 Chemical resistance
2.12 Materials in contact with drinking water and food
2.13 Mechanical properties of base resin
2.13.1 Virgin polymer resins
2.13.2 Material test data
2.13.3 Short term mechanical properties
2.13.4 Long term mechanical properties
2.13.5 Extrapolation of material test data
3 General considerations for structural analysis and design of rotationally moulded tanks
3.1 Structural analysis
3.2 Design
4 Structural analysis and design of non-buried tanks
4.1 General
4.2 Design
4.3 Applied loads
4.4 Load case combinations
4.5 Stability limit states
4.6 Strength limit states
4.7 Minimum material thickness
4.8 Required material thickness
4.9 Provision for overflow
5 Structural analysis and design of buried and partially-buried tanks
5.1 General
5.2 Loads on tanks
5.2.1 General
5.2.2 Hydrostatic uplift
5.2.3 Minimum loads
5.2.4 Load case combinations
5.3 Buried and partially buried tank analysis and design
5.3.1 General
5.3.2 Minimum material thickness
5.3.3 Required material thickness
5.4 Alternative methods of analysis
6 Dimensions and tolerances
6.1 Dimensions
6.2 Tolerances
6.2.1 Outside dimensions
6.2.2 Material thickness verification
6.2.3 Frequency
7 Tank capacity
8 Fittings
9 Rotational moulding process evaluation
10 Workmanship
11 Handling, storage and packing
12 Installation
12.1 General
12.2 Extensions for partially-buried and buried tanks
13 Marking requirements
Appendix A
A.1 Scope
A.2 Terms and definitions
A.3 Minimum sampling and testing frequency plan
A.4 Retesting
A.5 Documentation
Appendix B
B.1 Scope
B.2 Relevance
B.3 Principle
B.4 Apparatus
B.5 Preparation of test pieces
B.6 Procedure
B.7 Test report
Appendix C
C.1 Scope
C.2 Principle
C.3 Relevance
C.4 Terms and definitions
C.5 Apparatus
C.6 Preparation of test pieces
C.7 Procedure
C.8 Acceptance criteria
C.9 Test report
Appendix D
D.1 Scope
D.2 Immersion test method
D.2.1 Principle
D.2.2 Apparatus
D.2.3 Testing
D.2.3.1 Procedure
D.2.3.2 Test criteria
D.2.3.3 Frequency
D.2.4 Pass/fail
D.2.5 Repair
D.3 Test report
Appendix E
E.1 Scope
E.2 Siting of tanks
E.3 General installation
E.4 Soil
E.5 Surface water
E.6 Drainage
E.7 Backfilling
E.8 Installation instructions
E.8.1 General
E.8.2 Councils
E.8.3 Manufacturer
E.9 Repairs
Cited references in this standard
Structural design actions, Part 3: Snow and ice actions
NZS 3101.1
Concrete structures Standard, Part 1: The design of concrete structures
ASTM D2837
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products
ASTM D2990
Standard Test Methods for Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics
ASTM D3849
Standard Test Method for Carbon Black—Morphological Characterization of Carbon Black Using Electron Microscopy
Content history
DR AS/NZS 4766:2019
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