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发表于 2007-9-21 10:35
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来自: 中国山东烟台
ISO 8501-1 :1988/Suppl :1994
preparation of steel substrate before application of paints and related products---visual assessment of surface cleanliness.
不知道缩写怎么来的???
预处理阶段PSP (Primary surface preparation)的时候会用到这个标准里的要求.
在二次处理(Secondary surface preparation )阶段,涉及的要求:
Surface treatment
Sa 2½ on damaged shop primer and welds.Sa 2 removing at least 70% of intact shop primer, which has not passed a pre-qualification certified by test procedures in .1.c.If the complete coating system comprising epoxy based main coating and shop primer has passed a pre-qualification certified by test procedures in .1.c, intact shop primer may be retained provided the same epoxy coating system is used. The retained shop primer shall be cleaned by sweep blasting, high pressure water washing or equivalent method.If a zinc silicate shop primer has passed the pre-qualification test of .1.c as part of an epoxy coating system, it may be used in combination with other epoxy coatings certified under .1.c, provided that the compatibility has been confirmed by the manufacturer by the test in accordance with paragraph 1.7 of appendix 1 to annex 1 without wave movement.
Surface treatment after erection
Butts St 3 or better or Sa 2½ where practicable. Small damages up to 2% of total area: St 3. Contiguous damages over 25 m2 or over 2% of the total area of the tank, Sa 2½ should be applied.Coating in overlap to be feathered.
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