AS 1627.4-1989

1 - AS 1627.4-1989 METAL FINISHING - PREPARATION AND PRETREATMENT OF SURFACES - ABRASIVE BLAST CLEANING
4 - PREFACE
4 - CONTENTS
5 - FOREWORD
6 - SECTION 1. SCOPE AND GENERAL
6 - 1.1 SCOPE.
6 - 1.2 REFERENCEDDOCUMENTS.
6 - 1.3 DEFINITIONS.
6 - 1.3.1 Abrasive
6 - 1.3.2 Abrasive blast cleaning
6 - 1.3.3 Brush (whip) blasting
6 - 1.3.4 Feather edging
6 - 1.3.5 Preparation grades
6 - 1.3.6 Profile comparator
6 - 1.3.7 Selective blasting
6 - 1.3.8 Surface profile
6 - 1.3.9 Threshold limit value
6 - 1.3.10 Visible rust and millscale
6 - 1.3.11 Water blasting
6 - 1.3.12 Wet abrasive blast cleaning
6 - 1.3.13 Wet blasting inhibitor
6 - 1.4 CLASSES OF SURFACE PREPARATION.
6 - 1.4.1 Steel.
7 - 1.4.2 Stainless steel.
7 - 1.4.3 Non-ferrous materials (including galvanized materials)
8 - SECTION 2. METHODS OF OPERATION
8 - 2.1 TYPES OF ABRASIVES.
8 - 2.2 CHOICE OF ABRASIVES.
8 - 2.2.1 General.
9 - 2.2.2 Abrasive selection.
9 - 2.3 ABRASIVE BLAST CLEANING METHODS.
9 - 2.3.1 Dry abrasive blast cleaning.
10 - 2.3.2 Wet abrasive blast cleaning.
10 - 2.4 ABRASIVE BLAST CLEANING -METHOD SELECTION AND PROCEDURE.
10 - 2.4.1 Preliminary cleaning.
10 - 2.4.2 Choice of blast cleaning method.
12 - 2.4.3 Procedure for blast cleaning fabricated metal sections prior to erection
12 - 2.4.4 Procedure for blast cleaning existing structures.
12 - 2.4.5 Final cleaning.
12 - 2.5 SAFETY CONSIDERATIONS AND REQUIREMENTS.
12 - 2.5.1 Health hazards.
12 - 2.5.2 Protective clothing.
12 - 2.5.3 Face and eye protection.
12 - 2.5.4 Ear protection.
12 - 2.5.5 Respiratory protection.
12 - 2.5.6 Safe working guidelines.
13 - 2.5.7 Atmosphere.
13 - 2.5.8 Ventilation.
13 - 2.5.9 Lighting.
14 - APPENDIX A - PURCHASING GUIDELINES
14 - A1 GENERAL.
14 - A2 INFORMATION TO BE SUPPLIED BY THE PURCHASER.
15 - APPENDIX B - CLASSES OF SURFACE PREPARATION
15 - B1 GENERAL.
15 - B2 CLASS 1 - LIGHT BLAST CLEANING.
15 - B3 CLASS 2 - MEDIUM BLAST CLEANING.
16 - B4 CLASS 2 1/2 - ‘NEAR WHITE’ BLAST CLEANING.
16 - B5 CLASS 3 - ‘WHITE METAL’ BLAST CLEANING.
17 - APPENDIX C - METHODS OF MEASURING THE PROFILE HEIGHT
17 - C1 GENERAL.
17 - C2 REPLICA TAPE METHOD.
17 - C3 DEPTH MICROMETER METHOD.
17 - C4 COMPARISON METHOD.
17 - C5 STYLUS METHOD.
17 - C6 SURFACE REPLICA METHOD.
17 - C7 OPTICAL METHODS.
18 - APPENDIX D - EFFECT OF ABRASIVE SIZE ON SURFACE ROUGHNESS
18 - D1 GENERAL.
18 - D2 REFERENCES.
21 - APPENDIX E - SOLUBLE SALTS
22 - APPENDIX F - WET ABRASIVE BLAST CLEANING CORROSION INHIBITORS

Describes the procedures and equipment required for abrasive blast cleaning of metal surfaces. Classifies degrees of surface preparation. An appendix provides methods for measuring the profile height of blasted surfaces.

This Standard specifies surface preparation and describes procedures for the abrasive blast cleaning of metal surfaces prior to application of protective coatings, with specific reference to steel. Guidance is given on the choice of abrasives, abrasive methods and types of application.NOTES:1. Certain abrasives and blast cleaning methods may be incompatible. State health regulations may prohibit the use of certain dust producing abrasives (see Clause 2.5).2. Appendix A contains advice and recommendations on information which should be supplied by the purchaser at the time of enquiry or order.

Under Revision See DR 02009 CP