Protecting oilfield valves

Protecting oilfield valves
Weld overlay cladding specialist Arc Energy Resources has applied a coating of corrosion-resistant alloy for A. Finkl & Sons, to protect a brand new oilfield valve and refurbish an old one. A. Finkl & Sons of Chicago is a supplier of forging die steels, plastic mould steels, die casting tool steels and custom open-die forgings. Finkl UK Ltd (Warley, UK) was the first Finkl warehouse to operate outside of the USA and today stocks a range of specialised forged steels as well as offering comprehensive machining, testing and heat-treatment services.
Explains Finkl UK managing director Steve Hadley: “Customers in the oil and gas industry, for whom we stock specialised steel forgings, often subcontract our machine shop to manufacture oilfield valves.” He quotes a recent export contract, where Finkl was asked to manufacture a new 51/8â€? blow-out preventor valve body and refurbish a 5â€? body. Both valves, which are 2’ square and 3’ long, are designed to stop blow-outs from oil wells. Says Hadley: “As the dual valve bodies are handling aggressive oils or gases that corrode the surface of the steel, the specification for both included a corrosion and wear resistant weld overlay cladding to their inside diameters. Arc Energy applied a weld overlay cladding of Inconel 625 to all three bores of the new 51/8â€? valve. The main bore of the 5â€? valve, which had been eaten away by sour gas or oil, was first machined to remove the corrosion and then coated by Arc Energy. Finkl then machine-finished the bore to its original specification.

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