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The ASME Code Process for a Code Case: Non-Traditional Manufacturing Methods/Materials

CAMERON 3What are ASME Code Cases and how do I get one? This article addresses the who, what, where, why, when and how of the ASME Boiler & Pressure Vessel Code (B&PVC) code cases relative to valves and other pressure equipment. The article will also review the code cases that are in-process or issued regarding powder metallurgy parts.

To understand the content and use of a code case, we must first discuss what a standard is: a set of technical definitions and guidelines. So, a code is a standard adopted by a government (that has the force of law) or a standard required by contract. The ASME B&PVC is called “code” for a variety of reasons, but some have joked that it is because it is very difficult to decipher the process.


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.

Mechanical engineers, technologists and technicians receive anywhere from a paragraph to perhaps a section’s worth during their three- to four-year journey toward obtaining their degree or diploma. As students, only a handful may be lucky enough to see a gasket during a work training placement while the majority may have only seen references on drawings or bills of materials. Gaskets are a critical component in reducing fugitive emissions and having a better understanding of their complexity and application will make all gasket-related personnel more successful.

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.

The perception is often that this is an outdated technology suited to the steam-powered equipment of past centuries rather than one capable of meeting the needs of modern industry. But nothing could be further from the reality of contemporary packing products. Current technology utilized to design and manufacture high performance ensures that packing will be keeping up, not only with current but also with future needs and requirements.

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.

Knifegate Valve Maintenance and Repair

Knife Gate Valve Maintenance and Repair 1Knife gate valves are used to provide isolation in various applications including oil sands slurries, pulp stock, waste water and power generation. It is one of the simplest valve designs, and with only one moving part, the preventative maintenance schedule is straightforward.

1. Adjust the packing once a month.

2. Lubricate the stem and stem nut every three months. This should be done using a grase gun at the grease fitting at the top of the yolk.

3. Lubricate the gear operator once a year.

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