TPi April 2010

Coated tube & pipe

Zistaplex corrosion protection for tubes

Tubing and couplings

Tubing columns belong to the most critical parts of the piping systems used in oil and gas production and transportation. In many respects, oil and gas production costs depend on their trouble-free operation. The use of non-metallic coatings, such as polymeric, glass-enamel, silicon- enamel and improves tubing corrosion resistance, but the application of such coatings does not favour the formation of anti-wear and anti-corrosion properties of the tubing and coupling thread coats, and as a result, total tubing protection cannot be ensured. Integrated studies of diffusion zinc coating properties and their extensive field tests have shown that they provide efficient protection of tubes against corrosive and erosive effects of corrosive media during oil production. Delta 5+ is a new-generation diffusion zinc coating applied by the method of thermochemical diffusion zincing. This coating has been developed by Neozinc Scientific and Production Association for oil country tubes and their couplings. In comparison with galvanic, phosphate and metallised coatings, Delta 5+ has high characteristics of hardness, wear resistance and cohesion (due to diffusion bond) with the product surface. In comparison with polymeric coatings, Delta 5+ is not prone to ageing and galling. This feature prevents accidental damage of the coating and minimises drop of its protective properties. The technology and equipment for diffusion zinc coating developed by Neozinc Scientific and Production Association allow zincing of both long products (up to 12.5m) and small parts. An electric furnace of special design has a reliable multi-zone electronic system for controlling the coating process temperature conditions and ensures a high-quality coating on the inside and outside tube surfaces and threaded ends. Coating of a uniform thickness is formed on the entire coupling thread profile. Neozinc Scientific and Production Association JSC – Russia koryakan@gmail.com

Odelya is a supplier of line pipes consisting of spirally welded steel pipes from 6" to 120" OD and ERW pipes from ½" to 16" OD. The company’s pipes can be supplied with many types of coating and lining, such as inside epoxy/coal tar epoxy, bitumen, cement mortar lining; outside bitumen, polyethylene, polypropylene; and epoxy/coal tar epoxy coating. The pipes are used in pipelines for water, natural gas and petroleum, and as pilings in seaport construction. Partnership with selected mills, rigorous quality control, and reliable multi-model transport delivery allow the company to supply products to clients’ requirements and requested delivery times. Global sourcing of materials means that the Benteler Steel/Tube, Germany, is a manufacturer of high-quality steel tubes, and manufactures chromium-VI-free galvanised precision steel tubes under the name Zista-CRF ® . These tubes are used in applications such as vehicle tubing and for machine and plant construction. However, the coating must meet higher requirements in numerous applications. The combination of surface damage through transportation, handling, and further processing, as well as the absence of the self-repairing effect of the chromium-VI-free coating, led to a limitation of corrosion protection characteristics. Benteler Steel/Tube offers welded and seamless Zistaplex ® tubes in the chromium-VI-free product range as a solution to this problem. Benteler Zistaplex improves the corrosion resistance of galvanised tubes through an additional organic coating. In addition to providing corrosion protection, Zistaplex is also distinguished by excellent formability that meets most requirements, even after complete machining of the tubes. This eliminates the complex and costly galvanising and painting process on the customer side.

Benteler’s Zistaplex tubes

The special production process enables the flexible use of different organic coating types. In addition to free colour selection, special requirements such as temperature and chemical resistance can be met. A solvent-free process is employed for environmental and personnel safety reasons, which fulfils requirements of the EU Solvents Directive. The process also ensures a uniform coating and uniform corrosion protection over the entire tube, which enables use of the most common DIN and SAE tube screw fittings without prior removal of the coating.

Benteler Stahl/Rohr GmbH – Germany www.benteler.de

Coated and lined steel line pipes

Pipes from Turkish manufacturer Odelya

right material will be available anywhere in the world.

Odelya Demir Celik Tic San ve Nakliyat Ltd Sti – Turkey odelya@odelya.com www.odelya.com

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April 2010 Tube Products International