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Valve Techbook 2017

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EPmag.com | September 2017 | 15 VALVE TECHBOOK: MIDSTREAM MRC's Bowhay said contractors and mid- stream operators can help expedite delivery by planning ahead. "The simplest way to avoid supply issues is to purchase out of inventory," he said. "Lead times are extended in some cases to 40 weeks. That is difficult to plan for, and the original bill of material produced by any contractor is never the final one. There are always emergency buys in the life of any project. "Supply contracts are also helpful as they will also smooth out price changes and allow the end user to leverage the aggregated spend of a distributor like MRC Global," he added. Emissions rules Valve industry observers also mention another important challenge now to valve design and usage is the government's increasingly stringent rules on fugitive emissions. U.S. Environmental Protection Agency rules and other federal government regula- tions push low-emissions technology (Low E) for valves that limit volatile organic compound emis- sions. Some state emissions rules are even stricter. A Low E valve is defined as a valve, including its specific packing assembly or stem sealing com- ponent, for which the manufacturer has issued a written warranty that it will not emit fugitives at greater than 100 parts per million and that, if it does so emit at any time in the first five years, the manufacturer will replace the valve. The American Petroleum Institute's Standard Committee on Piping and Valves issued updated standards on fugitive emissions, API Standard 622, in 2016. "While other standards do address the issue of fugitive emissions, the API standards have also attempted to address leak rates and other aspects of valve performance," Valve magazine, published by VMA, said in an article following issuance of the energy trade organization's standard. The updated API standard establishes require- ments and parameters for the following tests, accord- ing to the publication: n Fugitive emissions; n Corrosion; n Packing material composition and properties; and n Oxidation evaluations. "The fugitive emissions testing includes 1,510 mechanical cycles with five thermal cycles—ambient to 500 F. The test methods apply to packing for use in on-off valve rising stem and rotating stem motions," API noted. Meanwhile, API is proposing its Rule 641, a new standard under consideration that would set fugi- tive emissions standards for the testing of common quarter-turn valves, including stem seal materials. Also, API's Specification 6D, which covers pipeline valves, is scheduled for an update that would develop a separate standards, done in conjunction with the Association of Wellhead Equipment Manufacturers. 40% 50% 60% 70% 80% 90% 100% 2008 2009 2010 20 11 2012 2013 2014 2015 2016 2017E Oil & Gas Transmission Petroleum Production Gas Distribution Cogeneration Refining Chemicals Other (Image courtesy of Valve Manufacturers Association of America) Share of Market

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