Valve Magazine

Tue08042015

Last updateMon, 03 Aug 2015 4pm

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Actuators & Controls

Designing for Safety: Failure Modes on Gate Valves

15 spr gateFor over 100 years, preventing catastrophic failure in the process control industry has been a continuously evolving area of study. To protect life, the environment, reputations and capital investments from compromise, we deliberate over safety and risk in every aspect of a system. As a positive result, systems of designed failure scenarios are strategically located throughout chemical refineries, power plants, floating vessels and offshore rigs. Understanding how process failure modes are achieved and where certain valves and actuation fit into the scenario is key to our efforts.

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Cost Implications for Throttling Electric Actuators in Pipeline Systems

15 wnt pipeline 1A few years ago, a major U.S. liquid pipeline company revamped one of its existing refined products pipelines. The pipeline provided a main supply of gasoline, jet and diesel fuel to many growing cities along the route as well as to two military bases. The project was designed to increase both throughput and reliability.

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Why Quarter-turn Valves ‘Pop’ Open

We’ve all seen this situation: A quarter-turn valve is in the closed position. A pneumatic actuator applies an opening torque that exceeds what’s required to begin to open the valve. Suddenly, the valve “jumps” or “pops” open to as much as 45 degrees or more, resulting in a sudden surge of potentially disruptive flow. Why did this occur and how can we avoid this phenomenon?

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Smaller Electric Actuators Fulfill Expanded Needs

14 spr actuators 1The conventional perception of a motorized valve is one of a large ­isolating valve with a heavy-duty valve actuator, usually powered by a three-phase electrical supply. However, many processes require smaller valves, and those valves often call for small electric actuators for isolating and modulating applications. As a result, the number of these smaller actuators is steadily growing.

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Fire Protection Solutions

14 wnt fire introBecause of the potential harm and damage to people and property, fires and explosions are a major concern in refinery, gas processing, petrochemical and offshore, and many other types of facilities. Minimizing the danger requires efficiently protecting the systems that control the potentially hazardous areas of those facilities. In many of them, valve operators, gear boxes and associated components are a top priority for safeguarding. This is because proper fireproofing of these components can mean this critical equipment can be controlled during an emergency, thereby preventing catastrophe.

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Valve Magazine Digital Edition

Valve Magazine Summer 2015Inside the Summer 2015 issue…

• Critical Service
• Effects of Flashing/Cavitation
• Coatings and Wastewater Apps
• The Latest in R&D

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