COLUMNS

Education

Stress Wave Monitoring

Surfaces in relative motion or in contact with each other  — such as bearing or gear components — produce a frequency response when they interact.

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Technical

Welding Specifications Issues

Q: I need to qualify a welding procedure specification per the ASME Boiler and Pressure Vessel Code.

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ARTICLES

Applications

Valves Tough Enough to Handle Hydrofluoric Acid

Hydrofluoric acid: just the name itself strikes fear in some people, even among those who work around it every day.

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Design

Recommended Practices (RP) Changing Engineering and Supplying of Assemblies

The issue is that assemblies are not currently treated as “engineered” items — they are often produced by slapping the actuator on the old (or new) valve specified by the piping requirements without much understanding of the specifics of the interactions between valve and actuator connections through the drive train (coupling).

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Education

Maintaining Hygienic Diaphragm Valves

The biopharmaceutical industry relies on hygienic diaphragm valves for its demanding process applications because of the unique needs for cleaning and draining, and for pressure and temperature capabilities.

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