SNZ TS 3404:2018
Durability requirements for steel structures and components
This technical specification covers the corrosion protection of structural steelwork in the New Zealand environment. Engineers, architects, contractors, specifiers of corrosion protection systems, the surface coating industry, and the owners of steel assets will find it useful. It provides a means of complying with the performance requirements of New Zealand Building Code clause B2 Durability for steel building elements. This technical specification provides an advanced framework for specifying the durability requirements for steel structures and components in atmospheric and in non-atmospheric environments, and will enable durability requirements to be met without over-specification or under-specification of coating systems. The technical specification updates the information contained in section 5 of NZS 3404.1:2009 and is republished as a stand-alone technical specification. It is a simplification of the design procedure for durability determination given in Heavy Engineering and Research Association Report R4-133:2011 New Zealand Steelwork Corrosion and Coatings Guide, and is intended to be used to ensure that structural steelwork is sufficiently durable to meet the requirements of the NZ Building Code Clause B2, the New Zealand Transport Agency (NZTA) Bridge manual, the NZTA Protective coatings for steel bridges, as well as remain compatible with NZS 3404:1997. The technical specification should be used together with AS/NZS 2312.1:2014 and AS/NZS 2312.2:2014. As the fabrication and erection provisions of NZS 3404 are in the process of being superseded by AS/NZS 5131:2016 and AS/NZS 5100.6:2017, the technical specification is also written to be compatible with those documents.
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SNZ TS 3404:2018 Durability requirements for steel structures and components
Committee representation
Acknowledgement
Copyright
CONTENTS
Referenced documents
Latest revisions
Review of standards
Foreword
1 GENERAL
1.1 Scope
1.2 Interpretation
1.3 Definitions
1.4 Abbreviations
1.5 Notation
1.6 Specified intended life and the New Zealand Building Code
1.7 Time to first major maintenance
1.8 Warranty considerations
1.9 Health, safety, and environment protection
1.10 Inaccessible surfaces
1.11 Surface preparation and application of corrosion protection systems
1.12 Galvanic corrosion
1.13 Detailing for durability
2 CORROSION PROTECTION OF STEEL IN ATMOSPHERIC ENVIRONMENTS
2.1 Corrosion protection systems
2.2 Determining the atmospheric corrosivity category
2.3 Selecting a complying corrosion protection system
2.4 Average steel loss over the design life of the structure
2.5 Assessing the remaining steel loss at the end of the design life
3 CORROSION OF STEEL IN NON-ATMOSPHERIC ENVIRONMENTS
3.1 Exposure classification
3.2 Corrosion rate of steel in non-atmospheric environments
3.3 Selecting a complying corrosion protection system
4 MISCELLANEOUS
4.1 Inspection of coatings
4.2 Inaccessible surfaces
4.3 Protection during transport and handling after corrosion protection
4.4 Repairs to corrosion protection
4.5 Coatings reference areas and test coupons
Table 1 – First-year corrosion rates of steel in different atmospheric corrosivity environments
Table 2 – Surface-specific atmospheric corrosivity categories
Table 3 – Other atmospheric corrosivity environments
Table 4 – Internal steelwork – Coating required only for appearance, surface-specific corrosivity category C1 and temporary protection during construction
Table 5 – Coatings for surface-specific corrosivity category C2
Table 6 – Coatings for surface-specific corrosivity category C3
Table 7 – Coatings for surface-specific corrosivity category C4
Table 8 – Coatings for surface-specific corrosivity category C5-M
Table 9 – Average corrosion rate (µm/annum) of carbon steel in different environments
Table 10 – Exposure classification for steel in water
Table 11 – Exposure classification for steel in refuse fill
Table 12 – Exposure classification for steel in soil
Table 13 – Corrosion allowance for steel in non-atmospheric environments
Table 14 – Suggested protective coating systems for steel piles in non-atmospheric environments
Table 15 – Average zinc corrosion rate (per side in contact) versus soil water, pH, or resistivity
Figure 1 – North Island corrosivity zone map
Figure 2 – South Island corrosivity zone map
Figure 3 – Auckland corrosivity zone map
Figure 4 – Wellington corrosivity zone map
Figure 5 – Tauranga corrosivity zone map
Figure 6 – Christchurch corrosivity zone map
Figure 7 – Dunedin corrosivity zone map
- B1
- B2
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SNZ TS 3404:2018 Durability requirements for steel structures and components
Committee representation
Acknowledgement
Copyright
CONTENTS
Referenced documents
Latest revisions
Review of standards
Foreword
1 GENERAL
1.1 Scope
1.2 Interpretation
1.3 Definitions
1.4 Abbreviations
1.5 Notation
1.6 Specified intended life and the New Zealand Building Code
1.7 Time to first major maintenance
1.8 Warranty considerations
1.9 Health, safety, and environment protection
1.10 Inaccessible surfaces
1.11 Surface preparation and application of corrosion protection systems
1.12 Galvanic corrosion
1.13 Detailing for durability
2 CORROSION PROTECTION OF STEEL IN ATMOSPHERIC ENVIRONMENTS
2.1 Corrosion protection systems
2.2 Determining the atmospheric corrosivity category
2.3 Selecting a complying corrosion protection system
2.4 Average steel loss over the design life of the structure
2.5 Assessing the remaining steel loss at the end of the design life
3 CORROSION OF STEEL IN NON-ATMOSPHERIC ENVIRONMENTS
3.1 Exposure classification
3.2 Corrosion rate of steel in non-atmospheric environments
3.3 Selecting a complying corrosion protection system
4 MISCELLANEOUS
4.1 Inspection of coatings
4.2 Inaccessible surfaces
4.3 Protection during transport and handling after corrosion protection
4.4 Repairs to corrosion protection
4.5 Coatings reference areas and test coupons
Table 1 – First-year corrosion rates of steel in different atmospheric corrosivity environments
Table 2 – Surface-specific atmospheric corrosivity categories
Table 3 – Other atmospheric corrosivity environments
Table 4 – Internal steelwork – Coating required only for appearance, surface-specific corrosivity category C1 and temporary protection during construction
Table 5 – Coatings for surface-specific corrosivity category C2
Table 6 – Coatings for surface-specific corrosivity category C3
Table 7 – Coatings for surface-specific corrosivity category C4
Table 8 – Coatings for surface-specific corrosivity category C5-M
Table 9 – Average corrosion rate (µm/annum) of carbon steel in different environments
Table 10 – Exposure classification for steel in water
Table 11 – Exposure classification for steel in refuse fill
Table 12 – Exposure classification for steel in soil
Table 13 – Corrosion allowance for steel in non-atmospheric environments
Table 14 – Suggested protective coating systems for steel piles in non-atmospheric environments
Table 15 – Average zinc corrosion rate (per side in contact) versus soil water, pH, or resistivity
Figure 1 – North Island corrosivity zone map
Figure 2 – South Island corrosivity zone map
Figure 3 – Auckland corrosivity zone map
Figure 4 – Wellington corrosivity zone map
Figure 5 – Tauranga corrosivity zone map
Figure 6 – Christchurch corrosivity zone map
Figure 7 – Dunedin corrosivity zone map
- B1
- B2
Previous versions
SNZ TS 3404:2018
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.