Corrosion monitoring system discussion on the causes of corrosion of oil and gas pipeline corrosion monitoring

Corrosion is commonly used in the field monitoring of cooling water system of corrosion monitoring methods are: specimen method, bypass test tube method, linear polarization method and monitoring method of heat exchanger. Specimens of which method is most widely used. 1. The test plate specimen is cooling water system in the most economic, most simple and the use of a corrosion monitoring method is one of the most widely. Corrosion rate can be measured by method of specimens, the density of bore the corrosion depth and corrosion and understand the corrosion of the metal form. A. monitoring specimens with specimens of the materials and specifications should be the same material and the material of heat exchanger tube. Is it possible to provide people with specimens of heat exchanger tube corrosion information. If there are several different material in the cooling water system of the tube, and should be used at the same time several specimens of different materials. For carbon steel heat exchanger, usually adopt ordinary hot-rolled specimens made from carbon steel A3.

Corrosion monitoring system used in cooling water system of standard specimens corrosion has two kinds: Ⅰ type and Ⅱ type, type should be used as Ⅰ, because of the small influence of edge effect. The corresponding sheet metal by planing, milling, drilling, grinding four working procedure, processing into a smooth finish and size of the specimens. After after digital steel grade (number), in a small enamel basin with chemical pure acetone use absorbent cotton swab twice, after the cold wind blow dry by air and anti-rust paper aside. Cooling water treatment in monitoring the use of standard specimens corrosion usually manufactured by special factory, and in the form of commodity supply. Operation when use, can press the steps: (1) after unsealed specimens with stainless steel tweezers and take out on the filter paper; (2) in a small basin, enamel with distilled water use absorbent cotton swab again and again with distilled water rinse 15 seconds; (3) immediately into pure anhydrous ethanol containing chemical small enamel basin, use absorbent cotton swab twice; (4) put the specimen on the clean filter paper, with the cold wind blow dry; (5) specimens with filter paper, in the dryer, 24 hours after weighing.