AS 4822:2024 sets out minimum requirements for the field joint coating (FJC) of seamless and welded steel buried onshore pipelines. It specifies the application and testing of corrosion protection coatings applied to steel surfaces left bare after the pipes and fittings (components) are joined by welding.
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Symbols and abbreviated terms
1.4.1 Symbols
1.4.2 Abbreviated terms
1.5 General requirements — Field joint coatings (FJCs)
2 Selection of FJCs
2.1 General
2.2 Types of FJCs
3 Application
3.1 Application procedure specification (APS)
3.2 Coating materials
3.2.1 Information to be supplied
3.2.2 Marking on shipment of coating materials
3.3 Type tests (TT)
3.4 Procedure qualification trial (PQT)
3.5 Qualification of coating and inspection personnel
3.6 Pre-production trial (PPT)
3.7 Production testing and inspection
4 Surface preparation, application, inspection, testing, repair and safety
4.1 Surface preparation
4.1.1 General
4.1.2 Preparation of the steel substrate
4.1.2.1 General
4.1.2.2 Abrasive blast cleaning
4.1.2.3 Wire brush cleaning
4.1.2.4 Reconditioning
4.1.2.5 Preparation of the adjoining factory-applied coating
4.2 Preliminary quality inspection
4.3 Prior to the application of the coating
4.4 Visual inspection of the applied coating
4.5 Testing of the FJC and repairs
4.6 Safety considerations
5 Petrolatum and polymeric tape coatings
5.1 General
5.2 Description of the coatings
5.2.1 Petrolatum tapes (Type 1A)
5.2.2 Polymeric tapes (Type 1B)
5.3 Surface preparation
5.4 Application of the coatings
5.4.1 General
5.4.2 Application of the primer
5.4.3 Application of petrolatum tapes
5.4.4 Application of polymeric tape
5.5 Inspection and testing of the applied coatings
5.5.1 General
5.5.2 General Inspection
5.5.3 Thickness
5.5.4 Holiday detection
5.5.5 Impact resistance
5.5.6 Indentation resistance
5.5.7 Drip resistance
5.5.8 Cathodic disbondment
5.5.9 Peel strength between tape layers of polymeric tapes
5.5.10 Peel strength to pipe surface and factory-applied coating
5.5.10.1 General
5.5.10.2 Petrolatum tapes (Type 1A)
5.5.10.3 Polymeric tapes (Type 1B)
5.5.10.4 Peel strength after immersion in water
5.5.11 Lap shear strength of polymeric tapes
5.5.12 Thermal ageing resistance of polymeric tapes
6 Heat-shrinkable coatings
6.1 General
6.2 Description of the coatings
6.2.1 General
6.2.2 Type 2A
6.2.3 Type 2B
6.3 Surface preparation
6.4 Application of the coatings
6.4.1 General
6.4.2 Preheating the joint
6.4.3 Application of the primer
6.4.4 Application of heat-shrinkable materials
6.5 Inspection and testing of the applied coatings
6.5.1 General
6.5.2 General inspection
6.5.3 Thickness
6.5.4 Holiday detection
6.5.5 Impact resistance
6.5.6 Indentation resistance
6.5.7 Lap shear strength of polymeric tapes
6.5.8 Thermal ageing resistance of polymeric tapes
6.5.9 Peel strength
6.5.10 Cathodic disbondment
7 Fusion-bonded epoxy (FBE) coatings
7.1 General
7.2 Storage conditions
7.3 Containers
7.4 Transport of FBE powder
7.4.1 Containers
7.5 Description of the coatings
7.6 Surface preparation
7.7 Application of the coatings
7.7.1 General
7.7.2 Heating
7.7.3 Application of epoxy powder
7.7.4 Field joint coating repairs
7.8 Inspection and testing of the applied coatings
7.8.1 General
7.8.2 Visual aspect
7.8.3 Thickness
7.8.4 Holiday detection
7.8.5 Adhesion
7.8.6 Degree of cure
7.8.7 Impact resistance
7.8.8 Cathodic disbondment
7.8.9 Hot water soak test
8 Liquid applied coatings
8.1 General
8.2 Description of the coatings
8.2.1 Liquid epoxy (4A)
8.2.2 Liquid polyurethane (4B)
8.2.3 Fibre reinforced epoxy (4C)
8.3 Surface preparation
8.4 Application of the coatings
8.4.1 General
8.4.2 Heating of the area to be coated
8.4.3 Coating application
8.5 Inspection and testing of the applied coatings
