Two questions today; feel free to participate
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1. For flammable media or those with toxicity grades II or III, the nominal pressure of the pipe flange shall not be lower than 1 MPa. （ ） 2. Butt weld joints of pipes with a nominal diameter of 250 mm or more must undergo 20% non-destructive testing. ( )
1. Wrong. For flammable substances or those with toxicity level III, flanges of a pressure rating of not less than 1.0 MPa should be used ； For Class II toxicity, flanges of a pressure rating of not less than 1.6 MPa should be used. 2. Wrong. The inspection ratio and acceptance level for the butt joints of pressure vessel nozzles with a nominal diameter of not less than 250 mm according to pressure vessel regulations should be the same as those required for the welds of the main equipment body. According to GB150, such welded joints must be inspected 100%, and their acceptance standard should be the same as that of the main welds.
1. Wrong. For flammable substances or those with toxicity level III, flanges of a pressure rating of not less than 1.0 MPa should be used ； For Class II toxicity, flanges of a pressure rating of not less than 1.6 MPa should be used. 2. Wrong. The inspection ratio and acceptance level for the butt joints of pressure vessel nozzles with a nominal diameter of not less than 250 mm according to pressure vessel regulations should be the same as those required for the welds of the main equipment body. According to GB150, such welded joints must be inspected 100%, and their acceptance standard should be the same as that of the main welds.
Is it to judge right or wrong? Question 1 is correct, Question 2 is wrong
1. For flammable media or those with toxicity grades II or III, the nominal pressure of the pipe flange shall not be lower than 1 MPa. (x) 2. Butt weld joints of pipes with a nominal diameter of 250 mm or more must undergo 20% non-destructive testing. ( √ )
May I ask: On the 2nd floor, for materials that are flammable or have toxicity of Grade III, flanges with a pressure rating of not less than 1.0 MPa should be used； Which regulation specifies that flanges of a grade of not less than 1.6 MPa should be used for Class II toxicity? 2. Wrong. The inspection ratio and acceptance level for the butt joints of pressure vessel nozzles with a nominal diameter of not less than 250 mm according to pressure vessel regulations should be the same as those required for the welds of the main equipment body. According to GB150, such welded joints must be inspected 100%, and their acceptance standard should be the same as that of the main welds.
1. For flammable media or those with toxicity grades II or III, the nominal pressure of the pipe flange shall not be lower than 1 MPa. ( X ) In accordance with HG20583, the nominal pressure of flanges for flammable and Class III toxic media shall not be lower than 1.0 MPa ； The nominal pressure of medium flanges with Class II toxicity shall not be lower than 1.6 MPa. 2. Butt weld joints of pipes with a nominal diameter of 250 mm or more must undergo 20% non-destructive testing. ( X ) According to GB150, all such welded joints shall be subject to flaw detection
Wrong. For flammable substances or those with toxicity level III, flanges of a pressure rating of not less than 1.0 MPa should be used ； For Class II toxicity, flanges of a pressure rating of not less than 1.6 MPa should be used. 2. Wrong. The inspection ratio and acceptance level for the butt joints of pressure vessel nozzles with a nominal diameter of not less than 250 mm according to pressure vessel regulations should be the same as those required for the welds of the main equipment body. According to GB150, such welded joints must be inspected 100%, and their acceptance standard should be the same as that of the main welds. Agreed.
1. For flammable media or those with toxicity grades II or III, the nominal pressure of the pipe flange shall not be lower than 1 MPa. (×) 2. Butt weld joints of pipes with a nominal diameter of 250 mm or more must undergo 20% non-destructive testing. (×)
1. Wrong. According to clauses 5.2.3 and 5.2.4 of HG20583, for media that are flammable or have moderate toxicity, the nominal pressure of the pipe flange shall be no less than 1.0 MPa ； For media with high and extremely high toxicity or strong permeability, the nominal pressure of the connecting flanges shall be no less than 1.6 MPa. 2. Wrong. According to Article 88 of the pressure vessel regulations, the inspection rate and acceptance criteria for the butt joints of pressure vessel nozzles with a nominal diameter of 250 mm or more shall be the same as those required for the welds of the main body of the equipment. And according to GB150, per 10.8.2
1. Wrong. For flammable substances or those with toxicity level III, flanges of a pressure rating of not less than 1.0 MPa should be used ； For Class II toxicity, flanges of a pressure rating of not less than 1.6 MPa should be used. 2. Wrong. The inspection ratio and acceptance level for the butt joints of pressure vessel nozzles with a nominal diameter of 250 mm or more should be the same as those required for the welds of the main equipment body.
1. For flammable media or those with toxicity levels II or III, the nominal pressure of the pipe flange shall not be lower than 1 MPa. (Incorrect) 2. Butt weld joints of pipes with a diameter of 250 mm or more must undergo 20% non-destructive testing. (Wrong)
1. For flammable media or those with toxicity grades II or III, the nominal pressure of the pipe flange shall not be lower than 1 MPa. ( × ) 2. Butt weld joints of pipes with a nominal diameter of 250 mm or more must undergo 20% non-destructive testing. (×)
My answer: 1.X 2.X
1. Wrong. For flammable substances or those with toxicity level III, flanges of a pressure rating of not less than 1.0 MPa should be used ； For Class II toxicity, flanges of a pressure rating of not less than 1.6 MPa should be used. 2. Wrong. The inspection ratio and acceptance level for the butt joints of pressure vessel nozzles with a nominal diameter of 250 mm or more should be the same as those required for the welds of the main equipment body.
1. For flammable media or those with toxicity grades II or III, the nominal pressure of the pipe flange shall not be lower than 1 MPa. (F) In accordance with HG20583, the nominal pressure of flanges for flammable and Class III toxic media shall not be lower than 1.0 MPa ； The nominal pressure of medium flanges with Class II toxicity shall not be lower than 1.6 MPa. 2. Butt weld joints of pipes with a nominal diameter of 250 mm or more must undergo 20% non-destructive testing. (F) In accordance with GB150, all such welded joints shall be subject to flaw detection