Flange Management Service
To obtain a leak-free flange connection, a proper gasket installation is needed, the bolts must be assigned to the correct bolt tension, and the total bolt strength must be evenly divided over the whole flange face. With Torque Tightening (the application of preload to a fastener by turning off the fastener’s nut) the correct bolt tension can be realized. Correct tightening of a bolt means making the best use of the bolt’s elastic properties. To work well, a bolt must behave just like a spring.
Tensioning is the direct axial stretching of the bolt to achieve preload. Inaccuracies created through friction are eliminated. The massive mechanical effort to create torque is replaced with simple hydraulic pressure. A uniform load can be applied by tensioning multiple studs simultaneously. Tensioning requires longer bolts and a seating area on the assembly around the nut. Tensioning can be done using detachable Bolt Tensioners or Hydraulic Nuts.