List the safety features found on Rx-202.
What will be an ideal response?
Stirred reactors are equipped with a number of safety features: pressure relief systems, quench systems, process variable alarms, and automatic shutdown controls. Quench systems are designed to stop the reaction process. Pressure relief systems are sized to handle and contain any release from the reactor. The relief system may be designed for liquid, vapor, or a liquid-vapor combination. Safety relief systems allow process releases to go to the plant flare system. Sometimes a chemical scrubber system is used before a product is sent to the flare system.
Process variable alarms will be activated by analytical (composition), pressure, temperature, flow, level, and time variables. Rotational speed on the agitator may be fixed or variable. A series of interlocks, permissives, and alarms will engage during operation and will provide a support network for the technician. A series of process video trends will be displayed to track each of the critical variables. Samples are taken frequently to ensure product quality. Stirred reactors are connected to off-specification (off-test) systems that allow flexibility in switching between prime and off-test operations. The automatic shutdown allows a technician to push one button and shutdown the system in the event of a runaway reaction or emergency.
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A) output enable must be disabled. B) data must be applied to data bus. C) it is necessary first to write all zeros into the command register. D) it is necessary first to write all 1st into the command register.
A 2,300/240-V, 60-Hz, 4.6-kVA transformer is designed to have an induced emf of 2.5 V/turn. Assuming an ideal transformer, find:
a. The numbers of high-side turns Nh and low-side turns Nl . b. The rated current of the high-voltage side Ih . c. The transformer ratio when the device is used as a step-up transformer. Assumptions: It is an ideal transformer.