Last updateThu, 21 Mar 2019 6pm


Understanding and Selecting Valve Flanges, Pt. I: Design and Standards

14 fall flanges introBecause flanges allow the assembly and maintenance of system components without the need for cutting and welding pipe, they play an important role in piping systems. However, the structural integrity and leak tightness of waterworks piping systems are only as strong as the weakest element, which often is the flange connection between various valves and fittings. Yet because piping systems are subject to many types of loads and are constructed of a variety of materials, understanding and predicting the rating and performance of those flange connections is difficult. This is further complicated by the fact that different sealing mechanisms such as gaskets, O-rings and mechanical seals can significantly affect the performance of the connections. As far as ratings, ASME B16.1 lists pressure ratings for Class 125 flanges from 50 to 200 psig depending on size, material and temperature.


From Coal to Combined Cycle

In the United States and around the world, industrial processers are striving to do more with less—to maximize efficiency, minimize costs and remain compliant with increasingly stringent regulations governing operations and output. The need for higher production at lower cost is especially pronounced within the power market. Producers must balance the growing demand for energy with the changing regulatory environment, while the traditional methods of power production, such as coal-fired power, face challenges that threaten their future viability.

Market Outlook 2015: Oil Joins Gas in the Spotlight

MOW ARTWORKNatural gas returned as star of the show at the 2014 VMA Market Outlook Aug. 14-15 in Boston, but it shared the stage this year with oil. Speakers said those two commodities promise to alter the flow of trade around the world and rebuild the North American economy. Speakers also said the economy has met the expectations for growth that many predicted would finally bury the Great Recession in the past.


Evaluating and Proving SIS Safety Levels

14 sum SIS introBecause the equipment used in a safety instrumented system (SIS) application has a critical job, such equipment must be carefully evaluated and justified. This justification must be based on information sufficient for giving those responsible adequate confidence that the equipment will perform as needed for the intended application.

Mitigating the Effects of Cycling a Power Plant

14 sum mitigatingSignificant changes in the power industry over the last 15 years have created new challenges for owners and operators of today’s generation facilities. As market conditions fluctuate, those facilities must respond to the needs of the regional power ­markets they serve, the demands of local grid operators’ requests for power dispatch, and their own operating and business objectives. As operators navigate these conditions and work to meet their objectives, a significant impact has occurred on ­generating facilities.

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