Steel surface treatment

First of all equipment, valves, flanges and pipelines paint removal derusting, sand blasting process, completely remove the rust layer. After the derusting with clean compressed air purge the surface, after passing the inspection, in no more than 8 hours for spraying treatment. After cleaning the quality of steel surface rust should be achieved, "pre-painted steel surface pretreatment specification" (SY / T0407-97), Sa3 level standards. Specific criteria are as follows: sandblasting rust completely remove the scale rust, the old coating and other dirt. After cleaning, there is no visible grease, grease, lime soil, scale, old coating on the steel surface, and the metal surface shows uniform metallic luster and roughness.