Flange Assemble

1. Before assembling the flange, the flange surface, especially the sealing surface, must be cleaned.2. When assembling the flat welding flange, the pipe end shall insert 2/3 of the inner diameter and thickness of the flange, and then spot weld the flange with the pipe. If it is a horizontal pipe, spot weld the flange from above first, and check the alignment position from different directions with 90° square rule, so that the sealing surface is perpendicular to the pipeHeart line, and then spot welding the second point below.3, with 90° square from the left and right direction to check the location of the calibration, after qualified spot welding of the third, fourth point, so as to complete the flange spot welding fixed work.4. For the assembly of paired flanges, the bolt holes of the installed flange should be aligned with the corresponding bolt holes of the fixed flange and parallel to the fixed flange, with the deviation no greater than 1.5‰ of the outer diameter of the flange and no more than 2mm.5, when selecting equipment or valve parts with flange, should pay attention to the original equipment or valve flange and pipe flange connection size is the same.2Commonly used gasket materialsRubber board and rubber asbestos board are commonly used flange gasket materials.1. Industrial rubber boardThe rubber board that says commonly is to point to industry to use rubber board namely, also call industry to use vulcanized rubber board or rubber plate.2, rubber asbestos boardRubber asbestos board also known as asbestos rubber board, generally used as equipment and pipeline flange connection sealing surface as gasket, medium can be water, steam, air, all kinds of gas, ammonia, lye and oil products.3Flange fastener assembly, connection, and maintenance of flangesFlange fasteners refer to bolts, nuts, and washers used to connect flanges. Hexagon head bolts are usually used for low-pressure pipelines, while double-headed bolts (studs) should be used for medium-high pressure pipelines. The nuts matched with the bolts are divided into type A and type B, the type A nut is on the hexagon of one side the other side is flat and the B nut is filleted on both sides. The hardness of the nut should be less than the hardness of the bolt or the stud, avoid the nut to destroy the thread on the bolt, and can reduce the bonding fastness after a long time, easy to remove, maintenance. Of or relating to a bolt or studLength, should be in flange gasket fastening nut exposed 5mm, not more than two times the screw pitch is appropriate. Flange connection bolts do not normally require gaskets. When the thread on the screw is slightly short, a washer can be added as a length compensation, leaving room for the subsequent secondary fastening round, but do not use the method of the overlapping gasket to compensate for the lack of thread length. The number and diameter of the bolt holes on the flange and the specification of the connecting bolts are specified in the relevant flange standards. The flange bolt holes are generally 2 ~ 3mm larger than the diameter of the bolt or the stud. Is an enterprise engaged in the research and development, production and sales of plastic water supply and drainage pipes, pipes and fittings for municipal roads and urban pipe network construction? Products variety, complete specifications, mainly: welding flange, with neck welding methodBlue, carbon steel with neck butt welding flange, carbon steel rolling flange, carbon steel galvanized flange, oval head, carbon steel flat bottom head, carbon steel welding head, butterfly head, stainless steel oval head, high pressure seamless tee, high pressure reducing tee, welding oblique tee, welding tee, carbon steel equal diameter tee.