Download Hydrocarbon Processing March by The Staff of Gulf Publishing Company PDF
By The Staff of Gulf Publishing Company
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Extra info for Hydrocarbon Processing March
Sample text
In addition, updates can come as quickly as the polling itself. However, unlike common protocols that must poll each point individually and consume precious bandwidth, OPC UA enables the OPC server to respond with any data that changed. Thus, a single efficient poll can bring back a large amount of data that include all the changes in the process as well as the health of the OPC server itself. By contrast, before OPC UA, DCOM communication sent all changes to the OPC client by exception. Thus, an OPC client did not have to poll the OPC server periodically.
Wireless plant network. There’s a lot more to a plant than what goes on inside the pipes and process vessels. Just as important as the products sold are the people who make them—and the information they use to do their jobs. Not just in offices or control rooms, but out in the field. Applications include video, HYDROCARBON PROCESSING MARCH 2009 I 31 SPECIALREPORT INSTRUMENTS AND NETWORKS voice, mobility and tracking. The wireless plant network is illustrated in Fig. 4. Wireless technology makes it easier to put those people in touch with the information they need, wherever they are.
To further protect a plant against fires, hydrogenspecific flame detectors can supervise entire process areas. Such wide coverage is necessary since a fire may ignite at a considerable distance from the leak source due to hydrogen cloud movement. When a containment system fails, hydrogen gas escapes at a rate that is proportional to the orifice size and the system’s internal pressure. Such leaks can be detected by ultrasonic monitors that sense airborne ultrasound produced by turbulent flow above a pre-defined sound pressure level.