sh3022-1999石油化工设备和管道涂料防腐蚀技术规范(英文)

sh3022-1999石油化工设备和管道涂料防腐蚀技术规范(英文)内容摘要：

flaking off or being able to be scraped out caused by rusting, and a small amount of corrosive pitting happened. ⑷ Grade D surface of steel material, on which oxide skin pletely flaking off caused by rusting, and an overall corrosive pitting happened.. Rustremoving grades of steel material are divided into four grades, they are: ⑴ St 2 thorough hand and power tool rustremoving. No visible grease and dirt or no adherend of loosen oxide skin, rust, paint skin ,and etc. on surface of steel material. ⑵ St 3 extreme thorough hand and power tool rustremoving No visible grease and dirt or no adherend of loosen oxide skin, rust, paint skin ,and etc. on surface of steel kind of rust removing should be done more thoroughly than St 2, surface of ground exposure part ought to have metal brightness. ⑶ Sa 2 thorough injection or slinging rust removing No visible grease and dirt on surface of steel material, adherend of oxide skin, rust and paint skin ,and etc. have been basically removed, the residue could be firmly adherent. ⑷ Sa extreme thorough injection or slinging rustremoving No visible grease and dirt, adherend of oxide skin, rust and paint skin and etc. on surface of steel — 9 — material, any residual trace should only be slight stain having spotted or striated state. Anticorrosion for onground equipment and piping Anticorrosive coating used for onground equipment and piping can be chosen according to Table . Table Quality and Usage of Anticorrosive coating Sort of paint Property and usage of paint Phenolic resin Asphalt Alkyd resin Vinyl perchloride Olefin resin Epoxy resin polyurethane Elemental anic silicon rubber Inanic zincrich General anticorrosion √ √ √ △ △ △ △ △ △ △ Resistance to Chemical atmosphere ○ √ ○ √ √ √ √ ○ √ √ resistance to Organic acid Acid gas ○ ○ ○ √ √ √ ○ ○ √ ○ Acid fog ○ √ √ ○ ○ √ ○ Organic acid fume and droplet resistance √ ○ ○ ○ ○ ○ resistance to Alkali ○ √ √ √ ○ √ √ resistance to Salts √ ○ ○ √ √ √ √ ○ √ √ Resist ance to Oil Gasoli ne, kerosene √ ○ √ √ √ √ ○ √ lubricant √ ○ √ √ √ ○ √ Resist ance to Solvent Hydrocarbon solvent √ ○ √ √ ○ ○ Fat, ket one solvent ○ ○ Chlorati ng solvent ○ ○ Resistance to Moisture √ √ ○ √ √ √ √ √ √ √ Resistace to Water √ √ √ √ √ √ √ √ √ Temperature resist ance to (℃ ) Norm al temperature √ √ √ √ √ √ √ △ √ √ ≤ 100 √ √ √ √ △ √ 101~200 √ △ √ 201~350 √ √ √ 351~500 √ ○ Weather resistance property ○ √ √ √ √ √ √ √ Adherence √ ○ √ ○ √ √ ○ √ √ Note: Mark “√ ” in the Table indicate excellent quality, being remended。 “○ ” indicate ordinary quality, able to be used。 “ ” indicate poor quality, unsuiable for using。 “△ ” indicate unsuiable coating for using because of price and construction, etc. — 10 — Except the following conditions, heatinsulated equipment and piping should be coated by 12 courses of anticorrosion paint of phenolic or alkyd resin: ⑴ Important insulating equipment and piping used in coastal and humidity area should be coated with hightemperature priming coat according to using conditions. ⑵ Adhesive bitumen primer , petroleum asphalt or asphalt priming coat can be used to coat cold preservation equipment and piping, with suitable 12courses coating. Total thickness of anticorrosion coating for onground equipment and piping should be adapted to the specifications in Table . Table Total thickness of coat dry film of onground equipment and piping (m) Corrosion degree Total thickness of coat dry film Important or hard to repairing location inside outside Deep etching ≥ 200 ≥ 250 Increasing 12 coating courses Moderate corrosion ≥ 150 ≥ 200 Weak corrosion ≥ 100 ≥ 120 Note : Total thickness of paint film of hightemperature coating is 4060μ m. Anticorrosion coating using life of onground equipment and piping should be adapted to the turn round of plant, less than two yeas are unsuitable. Requirement of rustremoving grade of priming coat for steel material surface should agree to specification in Table of steel material of rust grade D should be rustremoved by using injection or slinging. Table Requirements of suface rustremoving grade of priming coat for steel material Primer sort Rustremoving grade Deep etching Moderate corrosion Weak corrosion Phenolic resin Sa St 3 St 3 Asphalt Sa or St 3 St 3 St 3 Alkyd resin Sa St 3 St 3 Vinyl perchleride Sa Sa  Vinyl etch Sa Sa  Bitumineus epoxy Sa St 3 St 3 Epoxy resin Sa Sa  Polyurethane anticorrosive Sa Sa  Organic silicon heatresistance  Sa Sa Chlorosulfonated polythene Sa Sa  Alloprene Sa Sa  Inanic zincrich Sa Sa  — 11 — Anticorrosion of buried equipment and piping Rustremoving grade of surface of buried equipment and piping ought to be Grade St 3. Rustremoving grade should be determined according to Table based on soil corrosion grade. Table Grades of soil corrosion and anticorrosion Soil Soil corrosion quality Anticorrosion corrosion grade Electrical resistivity (m ) Salt content (mass ratio %) Moisture content (mass ratio %) Ampere density (mA/cm2 %) pH value grade deep 50 12 Extra reinforcement Moderate 50100 512 reinforcement Weak 100 5 ordinary Note: If any value of the items is higher than the corresponding target shown in the table, the anticorrosion grade should be increased in one class. Anticorrosion grade should be extra reinforcement grade for buried piping passing through railway, road, kennel a。