[Q&A Question 195] 2017.07.14
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This post was last edited by liuquan1100 on 2017-8-7 21:44. [Q&A Question 195] What precautions should be taken when removing and installing blind flanges during the shutdown of a plant on 2017.07.14? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Note: For questions of the type \"one question per day,\" if a person replies continuously for a month, that is, posts more than 30 times, their score will be assigned as 2 points, which is the lowest possible score. Click once to reply; if multiple replies are made, points will be awarded as appropriate, as deleting posts is also a waste of time. ①Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been removed and that the pressure has been reduced to atmospheric levels ； ②For pipelines that may contain toxic or harmful substances, gas protection monitoring should be in place when removing or installing blind flanges ； ③The specifications of the blind flanges selected shall meet the requirements ； ④Provide necessary instructions before removing or installing blind plates, and issue a blind plate operation ticket ； ⑤A dedicated person should be responsible for recording and inspecting the installation and removal of blind flanges, to prevent omissions or incorrect installations. Scoring criteria: 2 Wealth points for incorrect attempts; 3–8 points for *incomplete* answers. 10 Wealth points for correct answers, provided with a detailed explanation; 15–20 Wealth points if the answer is correct but lacks sufficient details. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Savings” Campaign (Second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017 Coal Chemicals – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html
1. Ensure nothing is missed. 2. Do not operate under pressure
Ensure that the pipeline equipment is ready for disassembly and assembly
Ensure that the pipeline equipment is ready for disassembly and assembly
1 Before removing or installing blind flanges, ensure that all material in the pipeline has been removed and that the pressure has been reduced to atmospheric level； 2 When removing or installing blind flanges on pipelines that may contain toxic or harmful substances, gas protection measures must be in place ； 3 The specifications of the blind plates used should meet the requirements ； 4. Provide proper instructions before removing or installing blind flanges, and issue a work order for the installation of those flanges ； 5 A dedicated person should be responsible for recording and inspecting the installation and removal of blind plates, to prevent missed or incorrect installations.
1. Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been removed and that the pressure has been reduced to atmospheric levels. 2. When removing or installing blind flanges on pipelines that may contain toxic or harmful substances, gas protection measures must be in place. 3. The specifications of the blind flanges used must meet the required standards. 4. Prior to removing or installing blind flanges, proper instructions must be provided, and a work order for the installation of the blind flanges must be issued. 5. Someone specific must be responsible for keeping records and conducting inspections to prevent incorrect or missing installations
○ 1. Before removing or installing a blind flange, it is necessary to ensure that all materials in the pipeline have been removed and that the pressure has been reduced to atmospheric levels. ○2. When removing or installing blind flanges on pipelines that may contain toxic or harmful substances, gas protection measures must be in place. ○3. The specifications of the blind flanges used must meet the required standards. ○4. Before removing or installing a blind flange, proper instructions should be provided, and an operation ticket for the task must be issued. ○5. Someone specific must be responsible for keeping records and conducting inspections during the removal or installation of blind flanges, in order to prevent mistakes or omissions
It is necessary to determine the system pressure and ensure that venting is complete to prevent residual pressure from causing injury.
Issue a work order to ensure that the materials inside the pipeline have been removed, the pressure has been released, and the conditions for working are met; also, wear appropriate personal protective equipment
Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been removed and that the pressure has been reduced to atmospheric levels； For pipelines that may contain toxic or harmful substances, gas protection monitoring should be in place when removing or installing blind flanges ； The specifications of the blind flanges selected shall meet the requirements ； Before removing or installing blind flanges, provide proper instructions and issue a blind flange operation ticket ； A dedicated person should be responsible for recording and inspecting the installation and removal of blind flanges, to prevent omissions or incorrect installations.
1. Before removing or installing a blind flange, it is necessary to ensure that all material in the pipeline has been removed and that the pressure has been reduced to atmospheric levels. ○2. When removing or installing blind flanges on pipelines that may contain toxic or harmful substances, gas protection measures must be in place. ○3. The specifications of the blind flanges used must meet the required standards. ○4. Before removing or installing a blind flange, proper instructions should be provided, and an operation ticket for the task must be issued. ○5. Someone specific must be responsible for keeping records and conducting inspections during the removal or installation of blind flanges, in order to prevent missed or incorrect installations