Copper flange assembly method：
When installing the connecting flange on a vertical cylinder, first make sure that the unevenness of the cylinder end meets the requirements, and adjust the level of the cylinder end surface to ensure that the cylinder is vertical. Draw a reference circle outside the opening line (by opening the hole). The center is the center of the circle and the diameter is greater than the flange diameter).
Measure the distance between the outer edge of the flange and the reference circle of the cylinder wall on the upper, lower and horizontal four star lines. The distance between the outer edge of the flange and the reference circle of the cylinder wall should be uniform; then the flange surface is measured by hanging a vertical line. The verticality is confirmed to meet the requirements.