(Summary description)Adapter flange fasteners refer to the bolts, nuts and washers used to connect adapter flanges. Hex head bolts are usually used for low pressure pipes, and studs (studs) should be used for medium and high pressure pipes. The nuts matched with the bolts are divided into A-type and B-type. The A-type nut is rounded on the hexagon on one side, and the other side is flat, while the B-type nut has rounded corners on both sides.
(Summary description)Adapter flange fasteners refer to the bolts, nuts and washers used to connect adapter flanges. Hex head bolts are usually used for low pressure pipes, and studs (studs) should be used for medium and high pressure pipes. The nuts matched with the bolts are divided into A-type and B-type. The A-type nut is rounded on the hexagon on one side, and the other side is flat, while the B-type nut has rounded corners on both sides.
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- Time of issue:2020-12-25 10:08
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Adapter flange fasteners refer to the bolts, nuts and washers used to connect adapter flanges. Hex head bolts are usually used for low pressure pipes, and studs (studs) should be used for medium and high pressure pipes. The nuts matched with the bolts are divided into A-type and B-type. The A-type nut is rounded on the hexagon on one side, and the other side is flat, while the B-type nut has rounded corners on both sides. The hardness of the nut should be less than the hardness of the bolt or stud, so as to avoid the nut from damaging the thread on the bolt, and reduce the bond fastness after a long time, which is convenient for disassembly and maintenance. The length of the bolt or stud should be within 5mm of the exposed nut after the replacement flange is fastened with a gasket, and should not be greater than twice the thread pitch.
1. Before assembling the replacement flange, the flange surface, especially the sealing surface, must be cleaned.
2. When assembling the replacement flange, the pipe end should be inserted into 2/3 of the thickness of the inner diameter of the flange, and then spot weld the flange and the pipe. If it is a horizontal pipe, it should be spot welded from above, and then use a 90° angle ruler. Check and correct the flange position from different directions, make its sealing surface perpendicular to the center line of the pipe, and then spot weld the second point below.
3. Use a 90° angle ruler to check and correct the position of the transfer flange from the left and right directions, and then spot weld the third and fourth points after passing the test, thus completing the spot welding and fixing of the transfer flange.
4. For the assembly of the paired flanges, the bolt holes of the rear-installed flanges should be aligned with the corresponding bolt holes of the fixed flanges, and should be parallel to the fixed flanges, and the deviation should not be greater than the outside of the flanges. 1.5‰ of the diameter and not more than 2mm.
5. When choosing the replacement flange for equipment or valve parts, pay attention to whether the flange of the original equipment or valve parts is consistent with the flange connection size used for the pipe.
