08292016Mon
Last updateThu, 25 Aug 2016 4pm

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The Role of Valves in HAZOP Studies

Process hazard analysis (PHA) is required by U.S. Occupational Safety and Health Administration (OSHA) regulations, as indicated in Code of Federal Regulation (CFR), 29CFR, Standard number 1910.119, Process Safety Management (PSM) of Highly Hazardous Chemicals. This section of the standard contains requirements for preventing or minimizing the consequences of catastrophic release of toxic, reactive, flammable or explosive chemicals. Such releases can result in hazards from toxicity, fire or explosion. A PHA identifies and evaluates potential hazards and risks to safety, health and the environment, and identifies safeguards and additional corrective measures to improve safety.

What Internal Best Practices Can Do for Valve Selection

As time goes by, technology moves forward, lessons are learned and industry requirements evolve. Personnel come and go, and facilities are bought and sold. The by-products of this evolution are changes to both industry best practices and corporate requirements.

The Limits of Standard Manual Globe Valves for Throttling

A common practice in process services is to use manual globe valves with hand wheels for regulating flow. These valves are relatively simple, rising stem devices that use a screwed stem to drive a disk into a seat horizontal to the flowing stream. For the most part, this practice has been effective. However, significant instances have occurred where these valves failed, particularly when they are used as maintenance bypass valves around control valves. Standard manual globe valves should be used with caution.

Mistakes and Misconceptions in Valve Leak Testing

Normally, valves are pressure tested by the factory to check for leaks before they’re shipped. The type and method of testing conforms to one or more of many different standards. The purpose of these tests and the expected results are often misunderstood and misapplied, resulting in unnecessary delays and unanticipated costs.

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