1. The maintenance unit shall formulate a fastening plan, fasten the flanges symmetrically, and number the fastening sequence.
2. Use 4 bolts to position the gasket to ensure that the center of the wound gasket is within the edge of the flange.
3. Tighten the fixing bolts by hand, then insert other stud bolts and tighten them by hand to balance the load, ensuring that at least 2 threads are exposed at each end of the nut.
4. According to the on-site equipment and flanges, one tightening circle is calculated as one time, and the number of tightenings (at least 3 times) and the hammering load (strength) of each tightening are reasonably determined. The tightening hammering load (strength) is calculated according to Tighten in order from small to large (such as 50%, 80% increments). Do not load the load too fast or too large to prevent gasket seal failure.
5. The sequence of each tightening with a torqueless torx wrench or hammer wrench: Tighten the two diametrically opposite bolts to the specified hammering load (strength) of the bolts; tighten the two bolts about 90 degrees apart from the previous two bolts along the circumference. Another pair of bolts; continue tightening until all remaining bolts are tightened to the established hammer load.
6. Then tighten all bolts in clockwise or counterclockwise direction according to the hammering load (strength).
