[Phase 1 of Time-Limited Quick Response Contest] 050 [Completed]

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Rules: 1. If you want to answer immediately, give a score of +1 wealth to Floor 1 and write your answer in the “Reason for action” field (only the content within parentheses); see the image below for details. 2. One “*” represents 1 Chinese character (or 1 digit), and the answer must match exactly to be considered correct. 3. The first person to answer correctly will receive +10 wealth points; please reply in the replies on floor 2 and below to claim the reward ； 4. The scope of questions covers the commonly used standards and experience manuals for the process and piping fields ； 5. The difficulty level of the questions increases from easy to difficult. 6. Lower-grade students are welcome to participate actively. Question for this issue: 050. For safety valves that may be blocked or corroded by materials, (***) should be installed in front of their inlet, or preventive measures such as (**, **), or (**) should be taken on the pipes at their inlet and outlet. Standard answer: rupture disc; purging; heating; insulation. Winner: lxsylb. This post was last edited by hutom123 on 2009-3-24 at 19:46.]