【Daily Question】 【AC Version for Static Equipment...Question 21】 January 21, 2019 – True/False Question...May all your wishes come true

Thread Content

This post was last edited by kareale88 on 2019-1-21 08:08: bg4.png【Daily Question】 【AC version for static devices...Question 21】 January 21, 2019 – True/False multiple-choice question...Wish it comes true. Please fill in the answers (multiple choice, single choice, single choice) in order. Reward rules: 1 wealth for participation, 3 wealth for each correct answer, up to a maximum of 10 wealth. This topic is valid for two days; no scoring will be given if it exceeds two days by 48 hours. The 2018 HaiChuan “Top 10 Outstanding Members” selection campaign has officially begun (Phase 1: Recommend the outstanding members in your eyes). https://bbs.hcbbs.com/thread-2243161-1-1.html There are also 19 rewards available; act now before it’s too late. Comprehensive Collection of Personal Integration Materials — Along with [Coating Materials – Integrated Compilation] — Adding Color to the New Year https://bbs.hcbbs.com/thread-2259051-1-1.html 1. For pressure vessels designed for a temperature of 400°C, the possible steel grades for their shells are (). A. Q235B ； B. Q245R ； C. Q345R ； -------------------2. The double-shell structure of shell-and-tube heat exchangers is suitable for applications in ( ). A. The design pressure of the tube side is higher than that of the shell side. B. The temperature difference between the tube side and the shell side is large. C. The fluids on the tube side and the shell side must not mix. ---------------------3. For a Q235—C steel plate with a thickness of 16 mm, the lower limit value of its yield strength ReL is 235 MPa. ( ) A. Correct B. Incorrect ---------------------- Answers: 1. B C 2. C 3. A 1. Comment: These materials are carbon steel and low-alloy steel, which are the most commonly used materials for pressure vessels; it is essential to remember their appropriate application ranges. It is not required to memorize all the technical parameters of all materials. 2. Comment: Different types of heat exchangers are suitable for different applications. Many people have never designed a double-shell structure, but as pressure vessel designers, they should have a basic understanding of the different types. 3. Comments: This question primarily tests understanding of the meanings of the steel grades commonly used in pressure vessels, rather than memorization of specific numbers.