1 Scope
This standard specified the process requirements and quality inspection of spreading anti-corrosive plastic powder coating on steel pipe and internal and external surface of pipe fittings (hereafter referred to as coating plastic).
This standard is applicable to transmission medium of seawater, wastewater, drinking water, oil and inert gas, and plastic coating process for steel pipe used for ship piping system with diameter DN of 15~600mm, while the straight pipe length is not greater than 6,000mm and the straight length of the bent pipe is not greater than 4,000mm. This standard shall also be the reference to similar steel pipes for plastic coating used in other industries.
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, all editions indicated are valid. All standards are subject to revision, and parties concerned are encouraged to discuss the possibility of applying the latest edition of the following standards.
GB 1764-79 Methods of Test for Measurement of Dry Film Thickness of Paints
GB/T 309l-93 Zinc Coat Welded Steel Pipes for Low Pressure Liquid Delivery
GB/T 3092-93 Welded Steel Pipes for Low Pressure Liquid Delivery
GB 5312-85 Carbon Steel Seamless Tubes for Shipbuilding
GB 6807-86 Specification for Phosphate Treatment of Iron and Steel Parts before Painting
GB 8162-87 Seamless Steel Tubes for Structural Purposes
GB 8163-87 Seamless Steel Tubes for Liquid Service
GB 8923-88 Rust Grades and Preparation Grades of Steel Surfaces before Application of Paints and Related Products
GB/T 13288-91 The Assessment of Profile Grades of Steel Surface before Application of Paint and Related Products - Comparator
GB/T 3790-1997 Rules for Marine Pipes Processing Technology
Foreword I
1 Scope
2 Normative References
3 Materials
4 Plastic Coating
5 Inspection of Coating Quality
6 Mark, Package and Transportation
Appendix A (Normative) Determination of Internal Coating Thickness of Steel Pipe
Appendix B (Normative) Air-hole-free Inspection Method for Coating
