Safety Technology Exchange Edition: Daily Question (2016.8.11)

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This post was last edited by 68589544 on 2016-8-17 01:44. 1.jpg Daily Question (Single-choice question): 1. To ensure the safe operation of pressure vessels, safety devices such as safety valves and burst discs are typically installed. Which of the following statements regarding the installation requirements for safety valves and burst discs is incorrect? ____ A. When a safety valve and a burst disc are used in parallel, the opening pressure of the safety valve should be slightly lower than the rated burst pressure of the burst disc. B. When a safety valve and a burst disc are used in parallel, the rated burst pressure of the burst disc must not exceed the design pressure of the container. C. When a burst disc is installed in series on the outlet side of the safety valve, the medium inside the container should not contain any sticky substances. D. When a burst disc is installed in series between the inlet of the safety valve and the container, the discharge area after the burst disc ruptures should be smaller than the inlet area of the safety valve. 2. Fire and explosion accidents in chemical enterprises can not only cause damage to equipment and buildings but may even lead to deaths; therefore, preventing explosions is a very important task. General methods to prevent explosions do not include ____. A. Keep the content of combustible substances in the mixed gas below the explosive limit. B. Use inert gases to replace air. C. Keep the oxygen concentration below its critical value. D. Design a sufficient area for explosion venting. The correct answers are AD; the answer for question 1, D, is also correct.