Friday, September 24, 2010

Corrosion protection of my brass ball valves

Corrosion protection is one of the most important requirements in the construction of pipelines (especially the trunk). Protection expose themselves directly to pipes, fittings, valves ( The requirements for corrosion-resistant coating is constantly being tightened, modern insulation materials help to protect pipes and fittings from corrosion for 20-30 years. Because of the specialization of our company, detailing corrosion protection of valves and pipeline fittings in the system of "Transneft".

The main documents governing the various kinds of protection of pipelines and fittings from corrosion, are GOST 51164 "Pipelines steel trunk. General requirements for corrosion protection ", RD-23.040.00-KTN-189-06" Rules for corrosion protection of above ground pipelines, structures and equipment facilities of main oil pipelines, OTT-04.00-27.22.00-KTN-006-1-03 " Technical requirements for external anticorrosion coating molded fittings and valves of the pipeline "; OTT" trunk pipeline. Fittings.
In the foregoing documents detail procedures for all types of work on application of protective coatings, the requirements for materials and equipment, methods of acceptance and control of the paint.
Depending on the location and conditions of the coating are divided into two types: the factory and line. Typically, in applications from contractors engaged in construction at the sites of Transneft, indicated that fixture shall be factory-corrosion coating. In practice, very few factories reinforcing its own exercise of protective coatings, especially on products for underground installation. Costs for the purchase of necessary equipment, materials, training of qualified personnel are sufficiently large. To dye valves according to the requirements of Transneft manufacturers attract specialized organizations that have licenses and permits for this type of work, and maintained by applying a protective coating on valve or on the territory of the plant itself, either on their own areas. Typically, such teams have a mobile painting of insulating and conducting work in the factories as well as "in the fields. From personal experience would like to note that the cost of the work on protective coatings that claim manufacturers valves are often substantially higher than the cost of these works, which take the actual perpetrators, while painting and in the factory and in our territory is held by the same materials , the same people and on the same hardware.
To protect the valves installed underground (both directly in the ground and in the wells) to the requirements of PAS-04.00-27.22.00-KTN-006-1-03 The most widely used materials of the Japanese company "Kawakami Paint FIG. Co.Ltd. "Brands FRUCS-1000A and US materials brand Biurs." These compounds are epoxy-urethane coating and consist of an epoxy primer layer and the outer layer of polyurethane. Plot the data coverage in parts insulated pipes and fittings by "hot" airless through special facilities. Subject to the technology of the work life of these coatings may exceed 30 years.
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