[Daily question] [Static Equipment Exchange Edition...Question 48] Multiple-choice question on February 17, 2019...The work went well

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bg14.jpg [Daily question] [Static Equipment Exchange Edition...Question 48] Multiple-choice question on February 17, 2019... Good luck with the work... Blessings to Haichuan's friends: Happy every year, a happy family, good luck, everything goes well and everyone is healthy, and good luck in life! .................................................................................... Please fill in the answers (single choice, single choice, single choice) in order. Bonus rules: Participation will reward 1 wealth, and correct answers will reward 3 wealth for each item, with a maximum of 10 wealth. This topic is valid for two days and will not be graded for more than two days and 48 hours. .................................................................... The final voting stage of the 2018 "Ocean Double Top Ten Outstanding Members" - participation is limited to the official WeChat account of Ocean S! See link below for details: https://bbs.hcbbs.com/thread-2281360-1-1.html Thank you very much to the sea friends who support our region - vote on the 28th - 29th - 30th - 31st and draw a lottery after voting: Notebooks, Haichuan cups, phone bills, 100 wealth and other rewards... 10 votes/10 draws/day... Hurry up and participate...................................................................... 1. Which of the following requirements should the difference between the maximum and minimum diameter of the same cross-section of the inner cylinder of a multi-layer wrapping container meet. A. No more than 0.5% of the inner diameter, and no more than 6mm ； B. No more than 1% of the inner diameter and no more than 25mm ； C. No more than 0.4% of the inner diameter and no more than 5mm ； --------------------- 2. If the pressure inside the container is likely to be lower than the atmospheric pressure and the container cannot withstand this negative pressure condition, the container should be installed. A. Arched explosion-proof disc B. Positive arched explosion-proof disc C. Relief device to prevent negative pressure D. Indirect load safety valve -------------------------- 3. The pipe mouth of a 13m3 liquefied petroleum gas storage tank is connected with NPT threads. () A. Correct B. Wrong--------------------- Answer 1. C 2. C 3. B 1. Comments: GB150.4 Knowledge of 12.1.1 multi-layer wrapped containers in manufacturing. 2. Comments: Basic concepts of safe relief of pressure vessels GB150.1 Appendix B Overpressure relief device B.3.4. 3. Comments: The sealing performance of the thread is poor, so a high-neck flange should be used. See 3.2.5 in TS21-2016.