05302016Mon
Last updateFri, 27 May 2016 2pm

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Technical

Strategies for Successful SIS Valve Diagnostic Implementation

Control RoomEnd users and contractors alike strive to design and operate plants with maximum plant safety and efficient production, and safety instrumented system may be required to reduce risk to an acceptable level. At times, diagnostics beyond valve functional proof tests such as partial stroke tests are implemented to provide additional diagnostic coverage necessary to meet a target SIL or desired proof test intervals. Alerts and test trends can also provide predicative diagnostics. This article explores considerations when implementing diagnostics to maximize usage and benefits.


Gasket Performance Standards and Application Toward Fugitive Emissions Reductions

ShortsTemperatureMost engineers, technical personnel and installation professionals involved with valve design and installation will inevitably need to consider a stationary seal at some point in their career. Stationary seals are everywhere in industry and unavoidable where valves are used. Bonnet gaskets, multi-piece valve body seal gaskets and flange connection gaskets are the most common stationary seals encountered. The problem, though, is that gaskets generally are never given the design and maintenance attention they require.

Braided Packing: An Old Technology with a Modern Twist

Braided PackingCompression packing is the primary method employed to seal the stem of many types of valves. It is made from soft, pliable material that is cut or formed into rings and compressed in an annular cavity to seal around a moving shaft. Compression packings are contained and compressed by a packing gland within a cavity called a stuffing box. It is a technology that has existed for a long time.

Fugitive Emission Testing and Certification of Valves – What Next?

Fugitive Emission Testing and Certification of Valves What NextThe primary sources of fugitive emissions from refineries and chemical plants are equipment leaks, process venting, evaporation losses, flaring, and accidents and equipment failures. When monitoring plants, the Environmental Protection Agency (EPA) is heavily focused on methane emissions.

Why such a heavy focus on methane? According to the EPA, methane is the predominant greenhouse gas emitted by the oil and gas sector. It is the second most prevalent greenhouse gas emitted in the U.S. from human activity. Per EPA reports, pound for pound, methane has 25 times the global warming potential of carbon dioxide. Methane’s lifetime in the atmosphere is much shorter than CO2, but it is more efficient at trapping radiation. As such, it is considered detrimental to public health.

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