TPI July 2014

Inspect ion and corrosion protect ion

Corrosion protection of coated carbon steel pipes

Olympics in 2012. Steel was chosen over alternative materials by a number of contractors due to the difficult ground issues prevalent in the East London area. Ranging from 80 to 1,200mm diameter, all the pipes and fittings supplied complied with DWI regulations and were coated with the three-layer PE, allowing them to be installed in brownfield sites. Projects included the infrastructure of the Olympic Park in Stratford, East London, the water mains replacement at Finsbury Park, and the provision of the white water canoe centre. The company recommends protecting pipe joints with its range of Canusa heat shrink sleeves. The heat activated/ PE wraps for corrosion protection of all types of jointing method are quick to install, as there is no need to prime or profile the pipe. Carbon steel pipeline installations can also be cathodically protected if low resistivity soils are present. Welded steel pipes, being electrically connected, are very simply and

Steel water pipes have been the choice for many pipeline sites across the UK. Some of the benefits associated with steel include pressure ratings, no thrust blocks, longer lengths, flexibility, variety of end connections, and epoxy or cement mortar internal linings. However, the over-riding benefit to the water industry of steel pipes supplied by FT Pipeline Systems lies in the corrosion protection provided by the three-layer blue polyethylene according to DIN 30670. Pipe and fitting surfaces are prepared by blasting and heating prior to the application of fusion bonded epoxy (to 150 microns), adhesive (to 100 microns), and extruded, heat-bonded polyethylene. The properties of the three-layer coating are based on the adhesion between the layers. This provides protection from impact and indentation, as well as corrosion protection. FT Pipeline Systems supplied pipes and pipe fittings to a variety of different projects in preparation for the London

DIN 30670 three-layer polyethylene application

cheaply protected by sacrificial anode or other cathodic protection systems. Once in the ground, a coated carbon steel water pipeline will provide an extended service life. Combined with cathodic protection, the water utility has a secure, well-protected asset. FT Pipeline Systems offers a complete range of steel water pipes and fittings in an extensive range of diameters and joint types, along with field joint protection sleeves.

FT Pipeline Systems Ltd – UK www.ftpipelinesystems.co.uk

Coating performance inside and out PPG Protective and Marine Coatings has completed a major project for Africa Pipe Industries, supplying internal and external coatings on a 46km, 2.1m diameter pipeline installed for South African utility Rand Water. providing oil and gas piping. PPG has built up more than 60 years’ experience and continuous investment in Africa, demonstrating a long-term commitment to customers across the continent.

Marius Rademeyer, market manager, PPG Protective and Marine Coatings, said, “This project required PPG to provide corrosion and bacterial protection to international standards and very specific customer demands. Sigmaline products have short manufacturing cycles due to quick curing times and the key advantage of single coat application properties.” For the pipeline’s external coating, Sigmaline 855 offers corrosion and water resistance and an aesthetic finish. The coating’s abrasion and impact

PPG supplied Sigmaline 523 as an internal lining and Sigmaline 855 as an external coating on the pipe installed at Sasolburg in the Free State region. Together, the coatings deliver high performance protection of both surfaces against corrosion and contamination of the pipeline content. The continued demand for resource infrastructure in South Africa has seen Africa Pipe Industries play a significant role in the roll-out of new bulk water services in South Africa as well as

Coated pipes

resistance protected against minor damage during handling, transporting and installation, with UV protection while awaiting installation on-site. PPG Protective and Marine Coatings – USA www.ppg.com

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July 2014 Tube Products International