ISO 28721-4:2015
Vitreous and porcelain enamels — Glass-lined apparatus for process plants — Part 4: Quality requirements for glass-lined flanged steel pipes and flanged steel fittings
ISO 28721-4:2015 specifies the quality requirements for glass-lined flanged steel pipes and flanged steel fittings used for process plants.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Materials for steel parts
5 Information to be supplied by the purchaser
6 Requirements
6.1 Requirements for the steel parts
6.1.1 Welding
6.1.2 Material properties
6.1.3 Surface characteristics
6.1.4 Exterior protection
6.2 Requirements for the glass-lined components
6.2.1 Surfaces
6.2.2 Enamel defects
6.2.3 Foreign matter in the enamel
6.2.4 Enamel coating thickness
6.2.5 Dimensions and tolerances
6.2.6 Other requirements
7 Tests and certificates
7.1 General
7.2 Place of testing
7.3 Testing of the substrate
7.4 Testing of the glass-lined components
8 Marking
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Materials for steel parts
5 Information to be supplied by the purchaser
6 Requirements
6.1 Requirements for the steel parts
6.1.1 Welding
6.1.2 Material properties
6.1.3 Surface characteristics
6.1.4 Exterior protection
6.2 Requirements for the glass-lined components
6.2.1 Surfaces
6.2.2 Enamel defects
6.2.3 Foreign matter in the enamel
6.2.4 Enamel coating thickness
6.2.5 Dimensions and tolerances
6.2.6 Other requirements
7 Tests and certificates
7.1 General
7.2 Place of testing
7.3 Testing of the substrate
7.4 Testing of the glass-lined components
8 Marking