AS 3862:2020 pdf free.External fusion-bonded epoxy coating for steel pipes.
3.1 Mill application
3.1.1 General
During surface preparation, coating and all handling activities, measures shall be taken to ensure pipe ends are not damaged. Ovality, bevel and bevel landing to remain within the requirements of the bare pipe specification. A quality management system shall be used.
NOTE An example of a suitable quality management system standard is AS/NZS ISO 9001.
3.1.2 Surface preparation
The following requirements apply to surface preparation:
(a) All oil, grease, soil, organic and other contaminants shall be thoroughly removed prior to abrasive cleaning. After cleaning, the pipe shall be suitably protected from, and maintained free of, all contaminants.
(b) Prior to the application of the coating, all rust and mill scale shall be removed from the external surface of the pipe by abrasive blast cleaning in accordance with AS 1627.4.
(c) Any solvents or detergents used in the pre-cleaning of pipe for spot removal of contaminants shall not leave a residue or coating, either before or after heating, which may adversely affect coating application or performance, or degrade pipe properties.
(d) Any water used in the pre-cleaning of the pipe surface shall be potable. It shall not contain more than 500 mg/L of total dissolved solids. The water shall not be re-used.
(e) The pipe shall be preheated prior to abrasive cleaning to a temperature at least 10 °C above the dew point. Thermometers used for determination of the dew point shall be calibrated to an accuracy of ± 0.5 °C. All pipe coming from the preheat oven or heating equipment shall be free of all moisture. Damp or wet pipe shall not be abrasive cleaned.
(f) Where the pipe is coated internally, the internal coating shall be protected from grit blast and impact damage at all times.
(g) The bevelled end of each pipe shall be preserved in the as-received condition.
NOTE 1 This is ordinarily achieved by the use of special polymer end caps or couplings that protect the bevelled end from impingement of grit and avoids the grinding together of pipe ends.
(h) Cleaning of the external pipe surface shall be in accordance with AS 1627.4 and be a minimum finish quality of Class Sa 2½.AS 3862 pdf download.