Standard
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AS 4822:2024
[Current]External field joint coatings for steel pipelines
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.
Published: 01/11/2024
Pages: 70
Table of contents
Cited references
Content history
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
8.5.1 General
8.5.2 Thickness
8.5.3 Visual inspection
8.5.4 Holiday detection
8.5.5 Adhesion
8.5.6 Impact resistance
8.5.7 Hardness
8.5.8 Flexibility
8.5.9 Cathodic disbondment
8.5.10 Hot water soak
8.5.11 Electrical resistivity
9 Amorphous low viscosity polyolefin coatings (ALVPC)
9.1 General
9.2 Description of the coatings
9.3 Surface preparation
9.4 Application of the coatings
9.4.1 General
9.4.2 Application
9.5 Inspection and testing of the applied coatings
9.5.1 General
9.5.2 General inspection
9.5.3 Thickness
9.5.4 Holiday detection
9.5.5 Impact resistance
9.5.6 Indentation resistance
9.5.7 Drip resistance
9.5.8 Cathodic disbondment
9.5.9 Peel strength between tape layers of polymeric tapes
9.5.10 Peel strength to pipe surface and factory-applied coating
9.5.10.1 General
9.5.10.2 Peel strength
9.5.10.3 Peel strength after immersion in water
9.5.11 Lap shear strength
Appendix A
A.1 General
A.2 Information to be supplied by the purchaser
A.3 Information to be supplied by the coating applicator
A.4 Certificate of conformance
A.5 Certificate of conformance for FJC and traceability
Appendix B
B.1 Laboratory measurement of peel strength
B.1.1 General
B.1.2 Apparatus
B.1.3 Procedure
B.1.4 Results
B.1.5 Test report
B.2 Measurement of the peel strength with a spring balance
B.2.1 General
B.2.2 Equipment
B.2.3 Procedure
B.2.4 Results
B.2.5 Test report
Appendix C
C.1 General
C.2 Apparatus
C.3 Procedure
C.4 Results
C.5 Test report
Appendix D
D.1 General
D.2 Apparatus
D.3 Procedure
D.4 Results
D.5 Test report
Appendix E
E.1 Scope
E.2 Apparatus
E.3 Test specimens
E.4 Procedure
E.5 Result
E.6 Test report
Appendix F
F.1 General
F.2 Apparatus
F.3 Preparation of the test specimen
F.4 Procedure
F.5 Results
F.6 Test report
Appendix G
G.1 Lap shear strength of tape coatings
G.1.1 General
G.1.2 Apparatus
G.1.3 Preparation of the test specimens
G.1.4 Procedure
G.1.5 Expression of result
G.2 LAP shear strength of shrinkable material coatings
G.2.1 General
G.2.2 Apparatus
G.2.3 Preparation of the test specimens
G.2.4 Procedure
G.2.5 Expression of result
G.3 Test report
Appendix H
H.1 General
H.2 Apparatus
H.3 Preparation of the test specimen
H.3.1 General
H.3.2 Tapes
H.3.3 Shrinkable materials
H.4 Procedure
H.4.1 General
H.4.2 Tapes
H.4.3 Expression of results
H.5 Test report
Appendix I
I.1 Elongation at break
I.1.1 General
I.1.2 Apparatus
I.1.3 Preparation of the test specimens
I.1.4 Procedure
I.1.5 Expression of result
I.2 Peel strength between layers
I.2.1 General
I.2.2 Apparatus
I.2.3 Preparation of the test specimens
I.2.4 Procedure
I.2.5 Expression of result
I.3 Peel strength to pipe surface
I.3.1 General
I.3.2 Apparatus
I.3.3 Preparation of the test specimens
I.3.4 Procedure
I.3.5 Expression of result
I.4 Test report
Appendix J
J.1 Scope
J.2 Apparatus
J.3 Test specimens
J.4 Procedure
J.5 Report
Appendix K
Bibliography
Cited references in this standard