CORROSION INHIBITION PROTECTION METHOD FOR GAS DUCTS Russian patent published in 1999 - IPC

FIELD: corrosion protection. SUBSTANCE: inhibited foam with elevated ratio equal to 100 to 1000 indestructible during its travel over gas duct is utilized. Foam is composed of, wt %: polyethylene glycol ether-type surfactant (blowing agent) 2.0, carboxymethylcellulose 0.5 and laurylpyridine sulfate 2.0 (the both foam stabilizers), diethanolamine (increasing foam density) 1.0, special-type corrosion inhibitor 10, and water - the balance. Method is recommended for use in oil-and-gas and chemical industries. EFFECT: enhanced corrosion protection efficiency.