[Daily Question] The last question of 2015: Ultrasonic testing of composite steel plates (reply +2 wealth, correct answer +3-8 wealth)

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This post was lastly written by FORREST_GUMP launched [Daily Question] in the editing machinery area on 2016-1-6 20:20. While activating the atmosphere of technical exchanges and guiding the direction of technical exchanges, GUMP will also give certain wealth rewards to Haiyou and help Haiyou experience various cool functions. Multiple choice questions: Pressure vessels with design pressures greater than or equal to (B) shall use stainless steel composite steel plates for main pressure components and stainless steel composite steel plates for heat exchanger tube sheets. Ultrasonic testing shall be carried out to reach Level III. A. 1MPa B. 1.6MPa C. 2.5MPa D. 4MPa This is the provision in paragraph 3 of 6.2.1 of HG/T20581 "Regulations on the Selection of Materials for Steel Chemical Containers": please note: We will close this post after 24 hours and publish the best reply (best help), answer and explanation. The competition for "Active Experts and Weekly Stars" in the Machinery Zone has begun http://bbs.hcbbs.com/thread-1489069-1-1.html Sharing on equipment anti-freeze and condensation for winterizing equipment http://bbs.hcbbs.com/thread-1502793-1-1.html