ESD ( Emergency shout down) tool (chemical engneering) Essay

ESD ( Emergency shout down) tool (chemical engneering) - Essay Example With all the components functioning properly, ESD can process an incoming input from the sensors and sends an output signal to initiate a response that handles the emergency. The principle parts of the system are the sensors, valves actuators and the logics units. When an output signal is sent to the valve in the event of any risk, a solenoid valves responds by initiating failure response and the programmed logical action is carried out. An impedance device with direct current power system boosts the solenoid operations, the power also runs the processor, but it has to be converted back to alternating current. In most cases, emergency tools or devices are used to perform safety operations, which includes shutting down an equipment or process when a fault is detect, such faults includes damage to the system or improper operation that can lead to damages. In some cases, emergency shutdown system can isolate a part of a system that may be presenting some risks such as deactivating hydrocarbon inventories, stopping hydrocarbon flow and depressurizing the system. ESD gives the operator a variety of integration options; one can integrate it as a stand-alone or full integration courtesy of its unique circuit design. It has a fully loaded library with operative commands that includes graphics, trend extended automation entities such as faceplates, graphic elements, trends, document links and alarms and events. In addition, ABB provides a broad family of industry-specific libraries that contain Control Modules, Function Blocks, Data Types and graphic elements including special safety systems features for ESD applications1. These pre-tested and safety-certified libraries significantly reduce the time required to engineer, test and maintain control while minimizing project risks. These libraries are certified for Safety Integrity Levels 3 and 2. The visualization system can be designed specifically fit the

Does Culture Evolve Essay Example | Topics and Well Written Essays - 500 words

Does Culture Evolve - Essay Example In White’s opinion, human civilization has always attempted to the control over nature through culture. According to White’s perspective on the evolution of culture, the more a culture is able to harness energy from nature using efficient technology, the more evolved a culture becomes. From his point of view, both energy and technology play major roles by bringing about a much better evolvement of ideology and social organization of culture. In his article Eric Wolf, looks at culture from a very different angle when compared to White’s perspective. According to Wolf, culture evolved and progressed through trade and commerce. Wolf explains how traders traveled across the rivers and carried on fur trade along the coasts. Due to the increase in trade, there was great development in different kinds of transport which was so necessary to carry on trade across different borders. During the 18th century, traders made use of Native American middle men to deliver their pr oducts but gradually trade took on a whole new dimension by becoming more organized and sophisticated. Gradually, traders got rid of the middle men and carried on the business directly with the primary producer.