【Daily Question No. 283】October 16, 2018
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【Daily Question No. 283】October 16, 2018: Briefly describe the precautions that should be taken when removing and installing blind flanges during the shutdown of a plant (1) Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been removed and replaced with an appropriate substance, and that the pressure has been reduced to atmospheric level ； (2) For pipelines containing toxic and hazardous substances, qualified personal protective equipment must be worn and effective on-site supervision must be provided when removing or installing blind flanges ； (3) The specifications of the blind flanges selected shall meet the relevant technical requirements ； (4) Before removing or installing blind flanges, a briefing should be conducted, and a valid and qualified blind flange operation ticket must be issued ； (5) A dedicated person shall be responsible for recording and inspecting the installation and removal of blind plates; failure to install them or installing them incorrectly is strictly prohibited. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
Before removing the blind flanges, it is necessary to confirm that the pipelines have been thoroughly cleaned and are free of pressure and temperature. Records should be kept during the removal of the blind flanges, so that all of them can be reinstalled based on these records before work resumes.
(1) Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been removed and replaced with an appropriate substance, and that the pressure has been reduced to atmospheric level； (2) For pipelines containing toxic and hazardous substances, qualified personal protective equipment must be worn and effective on-site supervision must be provided when removing or installing blind flanges ； (3) The specifications of the blind flanges selected shall meet the relevant technical requirements ； (4) Before removing or installing blind flanges, a briefing should be conducted, and a valid and qualified blind flange operation ticket must be issued ； (5) A dedicated person shall be responsible for recording and inspecting the installation and removal of blind plates; failure to install them or installing them incorrectly is strictly prohibited.
(1) Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been removed and replaced with an appropriate substance, and that the pressure has been reduced to atmospheric level； (2) For pipelines containing toxic and hazardous substances, qualified personal protective equipment must be worn and effective on-site supervision must be provided when removing or installing blind flanges ； (3) The specifications of the blind flanges selected shall meet the relevant technical requirements ； (4) Before removing or installing blind flanges, a briefing should be conducted, and a valid and qualified blind flange operation ticket must be issued ； (5) A dedicated person shall be responsible for recording and inspecting the installation and removal of blind plates; failure to install them or installing them incorrectly is strictly prohibited.
1. Ensure that the medium inside the pipeline has been completely removed and that there is no pressure present. 2. There must be signed documents for the installation and removal of blind flanges, these documents should be numbered and accompanied by identification tags for the blind flanges. 3. All actions related to the installation and removal of blind flanges must be properly recorded; a designated person should oversee this process and sign off to prevent any omissions. 4. The dimensions of the blind flanges must be appropriate. 5. In principle, blind flanges must be installed on all pipelines in the relevant area
(1) Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been removed and replaced with an appropriate substance, and that the pressure has been reduced to atmospheric level； (2) For pipelines containing toxic and hazardous substances, qualified personal protective equipment must be worn and effective on-site supervision must be provided when removing or installing blind flanges ； (3) The specifications of the blind flanges selected shall meet the relevant technical requirements ； (4) Before removing or installing blind flanges, a briefing should be conducted, and a valid and qualified blind flange operation ticket must be issued ； (5) A dedicated person shall be responsible for recording and inspecting the installation and removal of blind plates; failure to install them or installing them incorrectly is strictly prohibited.
(1) Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been removed and replaced with an appropriate substance, and that the pressure has been reduced to atmospheric level； (2) For pipelines containing toxic and hazardous substances, qualified personal protective equipment must be worn and effective on-site supervision must be provided when removing or installing blind flanges ； (3) The specifications of the blind flanges selected shall meet the relevant technical requirements ；
1) Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been completely removed and replaced with an appropriate substance, and that the pressure has been reduced to atmospheric level； (2) For pipelines containing toxic and hazardous substances, qualified personal protective equipment must be worn and effective on-site supervision must be provided when removing or installing blind flanges ； (3) The specifications of the blind flanges selected shall meet the relevant technical requirements ； (4) Before removing or installing blind flanges, a briefing should be conducted, and a valid and qualified blind flange operation ticket must be issued ； (5) A dedicated person shall be responsible for recording and inspecting the installation and removal of blind plates; failure to install them or installing them incorrectly is strictly prohibited.
(1) Before removing or installing blind flanges, it is necessary to ensure that all material in the pipeline has been removed and replaced with an appropriate substance, and that the pressure has been reduced to atmospheric level； (2) For pipelines containing toxic and hazardous substances, qualified personal protective equipment must be worn and effective on-site supervision must be provided when removing or installing blind flanges ； (3) The specifications of the blind flanges selected shall meet the relevant technical requirements ； (4) Before removing or installing blind flanges, a briefing should be conducted, and a valid and qualified blind flange operation ticket must be issued ； (5) A dedicated person shall be responsible for recording and inspecting the installation and removal of blind plates; failure to install them or installing them incorrectly is strictly prohibited.
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. Before removing or installing blind flanges, proper instructions should be provided, and a work order for the installation of the blind flanges should be issued. 5. Someone specific should be responsible for keeping records and conducting inspections during the removal or installation of blind flanges, in order to prevent missed or incorrect installations
1. Obtain a permit for blind plate removal and installation work； 2. Conduct sample analysis for hydrogen sulfide and flammable gas levels to ensure proper purging ； 3. Open the on-site vent to ensure no pressure is present ； 4. Two-person operation.