Flange basic use of common sense summary

To assemble a flat-welded flange, insert the pipe end into 2/3 of the inner diameter of the flange and spot weld the flange to the pipe. If it is a degree tube, spot weld from above, then check the position of the calibration flange from different directions using a 90° square and convert the sealing face to a center line perpendicular to the container. The pipe. After no errors, spot weld the second point below.
Before assembling the flange, clean and clean the flange surface, especially the sealing surface. To assemble a flat-welded flange, insert the pipe end into 2/3 of the inner diameter of the flange and spot weld the flange to the pipe. If it is a degree pipe, spot weld from above, then check the position of the calibration flange from different directions using a 90° square and convert the sealing face to a position perpendicular to the centerline of the pipe. After no errors, spot weld the second point below.
Check and correct flange position from left to right using 90° ruler. After passing the test, spot weld the third and fourth points to complete spot weld and flange fixation. When assembling a pair of flanges, the bolt holes of the rear device flange should be aligned with the corresponding bolt holes of the fixed flange and parallel to the fixed flange. The size of the rear device flange should not exceed 1.5‰ of the flange diameter and exceed 2 mm.
When selecting equipment flanges or valve component flanges, pay attention to whether the connection sizes of the original equipment flanges or valve component flanges are different from those used in piping. Flanged upholstered industrial rubber sheet is the most commonly used material for cushion assembly, flange rubber sheet and rubber asbestos sheet connection and maintenance of common materials. Rubber sheet usually refers to industrial rubber sheet, also known as industrial vulcanized rubber sheet or rubber sheet.
Rubber asbestos board is also known as asbestos rubber board. Usually used as gaskets for sealing surfaces of equipment and pipe flanges. The media may be water, steam, air, various gases, ammonia, lye and petroleum products for assembly, connection and maintenance, etc. Flange fasteners are bolts, nuts, and washers used to attach flanges.