Pilot industrial tests of SNPKh-6438 corrosion inhibitor for protecting equipment and lines were performed in a plant that produces the components of diesel fuel (DFCPU) at Tatneft' Co. Karabash Irkenneft' Oil and Gas Production Co. UKPN. According to the test results, the inhibitor is recommended for corrosion protection for the condensation-cooling unit of this plant at a flow rate of 250 g/m(3). The protective effect is 88%. The operating conditions of the unit are not disturbed when the inhibitor is used.