发明名称 |
METHOD OF APPLYING PROTECTIVE COATING ON INNER SURFACE OF MAIN PIPELINE |
摘要 |
FIELD: chemistry.SUBSTANCE: in the method, preliminary cleaning of the inner surface of a pipe is carried out by degreasing with an alkaline solution, washing with deionised water and drying. Jet cleaning by a shotblasting method is then carried out using steel grit with size of not more than 1.6 mm to obtain surface finish Rz=30-120 mcm and salt content of not more than 50 mg/m=m. The inner surface then undergoes air blowing and preheating. A protective coating is then applied by airless spraying through a nozzle. The coating used is a solvent-free, polyamine-cured epoxide compound. The coating is cured by heating to temperature of 60-120°C and holding at said temperature for not less than 4 hours. Preheating is preferably carried out not later than 6 hours after preliminary cleaning and blowing with air to temperature higher than dew point by not less than 3°C, with relative air humidity of not more than 90%. Overall thickness of the "wet" film of the applied protective coating can be 300-800 mcm.EFFECT: improved quality and durability of the coating.4 cl |
申请公布号 |
RU2525031(C1) |
申请公布日期 |
2014.08.10 |
申请号 |
RU20130106554 |
申请日期 |
2013.02.14 |
申请人 |
OTKRYTOE AKTSIONERNOE OBSHCHESTVO "SEVERSTAL'" (OAO "SEVERSTAL'") |
发明人 |
SKOROKHVATOV NIKOLAJ BORISOVICH;VELICHKO ALEKSANDR ALEKSEEVICH;KORCHAGIN ANDREJ MIKHAJLOVICH;TIKHONOV SERGEJ MIKHAJLOVICH;BARABASH KONSTANTIN JUR'EVICH;MAKHOV GENNADIJ ALEKSANDROVICH;SULJAGIN ROMAN VALER'EVICH |
分类号 |
F16L58/02;C23D5/02 |
主分类号 |
F16L58/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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